jaroslav@56: /*
jaroslav@56:  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
jaroslav@56:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
jaroslav@56:  *
jaroslav@56:  * This code is free software; you can redistribute it and/or modify it
jaroslav@56:  * under the terms of the GNU General Public License version 2 only, as
jaroslav@56:  * published by the Free Software Foundation.  Oracle designates this
jaroslav@56:  * particular file as subject to the "Classpath" exception as provided
jaroslav@56:  * by Oracle in the LICENSE file that accompanied this code.
jaroslav@56:  *
jaroslav@56:  * This code is distributed in the hope that it will be useful, but WITHOUT
jaroslav@56:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
jaroslav@56:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
jaroslav@56:  * version 2 for more details (a copy is included in the LICENSE file that
jaroslav@56:  * accompanied this code).
jaroslav@56:  *
jaroslav@56:  * You should have received a copy of the GNU General Public License version
jaroslav@56:  * 2 along with this work; if not, write to the Free Software Foundation,
jaroslav@56:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
jaroslav@56:  *
jaroslav@56:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
jaroslav@56:  * or visit www.oracle.com if you need additional information or have any
jaroslav@56:  * questions.
jaroslav@56:  */
jaroslav@56: 
jaroslav@56: package java.lang;
jaroslav@56: 
jaroslav@94: import org.apidesign.bck2brwsr.core.JavaScriptBody;
jaroslav@94: 
jaroslav@56: /**
jaroslav@56:  * A mutable sequence of characters.
jaroslav@56:  * <p>
jaroslav@56:  * Implements a modifiable string. At any point in time it contains some
jaroslav@56:  * particular sequence of characters, but the length and content of the
jaroslav@56:  * sequence can be changed through certain method calls.
jaroslav@56:  *
jaroslav@56:  * @author      Michael McCloskey
jaroslav@56:  * @author      Martin Buchholz
jaroslav@56:  * @author      Ulf Zibis
jaroslav@56:  * @since       1.5
jaroslav@56:  */
jaroslav@56: abstract class AbstractStringBuilder implements Appendable, CharSequence {
jaroslav@56:     /**
jaroslav@56:      * The value is used for character storage.
jaroslav@56:      */
jaroslav@56:     char[] value;
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * The count is the number of characters used.
jaroslav@56:      */
jaroslav@56:     int count;
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * This no-arg constructor is necessary for serialization of subclasses.
jaroslav@56:      */
jaroslav@56:     AbstractStringBuilder() {
jaroslav@56:     }
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * Creates an AbstractStringBuilder of the specified capacity.
jaroslav@56:      */
jaroslav@56:     AbstractStringBuilder(int capacity) {
jaroslav@56:         value = new char[capacity];
jaroslav@56:     }
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * Returns the length (character count).
jaroslav@56:      *
jaroslav@56:      * @return  the length of the sequence of characters currently
jaroslav@56:      *          represented by this object
jaroslav@56:      */
jaroslav@56:     public int length() {
jaroslav@56:         return count;
jaroslav@56:     }
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * Returns the current capacity. The capacity is the amount of storage
jaroslav@56:      * available for newly inserted characters, beyond which an allocation
jaroslav@56:      * will occur.
jaroslav@56:      *
jaroslav@56:      * @return  the current capacity
jaroslav@56:      */
jaroslav@56:     public int capacity() {
jaroslav@56:         return value.length;
jaroslav@56:     }
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * Ensures that the capacity is at least equal to the specified minimum.
jaroslav@56:      * If the current capacity is less than the argument, then a new internal
jaroslav@56:      * array is allocated with greater capacity. The new capacity is the
jaroslav@56:      * larger of:
jaroslav@56:      * <ul>
jaroslav@56:      * <li>The <code>minimumCapacity</code> argument.
jaroslav@56:      * <li>Twice the old capacity, plus <code>2</code>.
jaroslav@56:      * </ul>
jaroslav@56:      * If the <code>minimumCapacity</code> argument is nonpositive, this
jaroslav@56:      * method takes no action and simply returns.
jaroslav@56:      *
jaroslav@56:      * @param   minimumCapacity   the minimum desired capacity.
jaroslav@56:      */
jaroslav@56:     public void ensureCapacity(int minimumCapacity) {
jaroslav@56:         if (minimumCapacity > 0)
jaroslav@56:             ensureCapacityInternal(minimumCapacity);
jaroslav@56:     }
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * This method has the same contract as ensureCapacity, but is
jaroslav@56:      * never synchronized.
jaroslav@56:      */
jaroslav@56:     private void ensureCapacityInternal(int minimumCapacity) {
jaroslav@56:         // overflow-conscious code
jaroslav@56:         if (minimumCapacity - value.length > 0)
jaroslav@56:             expandCapacity(minimumCapacity);
jaroslav@56:     }
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * This implements the expansion semantics of ensureCapacity with no
jaroslav@56:      * size check or synchronization.
jaroslav@56:      */
jaroslav@56:     void expandCapacity(int minimumCapacity) {
jaroslav@56:         int newCapacity = value.length * 2 + 2;
jaroslav@56:         if (newCapacity - minimumCapacity < 0)
jaroslav@56:             newCapacity = minimumCapacity;
jaroslav@56:         if (newCapacity < 0) {
jaroslav@56:             if (minimumCapacity < 0) // overflow
jaroslav@56:                 throw new OutOfMemoryError();
jaroslav@56:             newCapacity = Integer.MAX_VALUE;
jaroslav@56:         }
jaroslav@104:         value = copyOf(value, newCapacity);
jaroslav@56:     }
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * Attempts to reduce storage used for the character sequence.
jaroslav@56:      * If the buffer is larger than necessary to hold its current sequence of
jaroslav@56:      * characters, then it may be resized to become more space efficient.
jaroslav@56:      * Calling this method may, but is not required to, affect the value
jaroslav@56:      * returned by a subsequent call to the {@link #capacity()} method.
jaroslav@56:      */
jaroslav@56:     public void trimToSize() {
jaroslav@56:         if (count < value.length) {
jaroslav@104:             value = copyOf(value, count);
jaroslav@56:         }
jaroslav@56:     }
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * Sets the length of the character sequence.
jaroslav@56:      * The sequence is changed to a new character sequence
jaroslav@56:      * whose length is specified by the argument. For every nonnegative
jaroslav@56:      * index <i>k</i> less than <code>newLength</code>, the character at
jaroslav@56:      * index <i>k</i> in the new character sequence is the same as the
jaroslav@56:      * character at index <i>k</i> in the old sequence if <i>k</i> is less
jaroslav@56:      * than the length of the old character sequence; otherwise, it is the
jaroslav@56:      * null character <code>'&#92;u0000'</code>.
jaroslav@56:      *
jaroslav@56:      * In other words, if the <code>newLength</code> argument is less than
jaroslav@56:      * the current length, the length is changed to the specified length.
jaroslav@56:      * <p>
jaroslav@56:      * If the <code>newLength</code> argument is greater than or equal
jaroslav@56:      * to the current length, sufficient null characters
jaroslav@56:      * (<code>'&#92;u0000'</code>) are appended so that
jaroslav@56:      * length becomes the <code>newLength</code> argument.
jaroslav@56:      * <p>
jaroslav@56:      * The <code>newLength</code> argument must be greater than or equal
jaroslav@56:      * to <code>0</code>.
jaroslav@56:      *
jaroslav@56:      * @param      newLength   the new length
jaroslav@56:      * @throws     IndexOutOfBoundsException  if the
jaroslav@56:      *               <code>newLength</code> argument is negative.
jaroslav@56:      */
jaroslav@56:     public void setLength(int newLength) {
jaroslav@56:         if (newLength < 0)
jaroslav@56:             throw new StringIndexOutOfBoundsException(newLength);
jaroslav@56:         ensureCapacityInternal(newLength);
jaroslav@56: 
jaroslav@56:         if (count < newLength) {
jaroslav@56:             for (; count < newLength; count++)
jaroslav@56:                 value[count] = '\0';
jaroslav@56:         } else {
jaroslav@56:             count = newLength;
jaroslav@56:         }
jaroslav@56:     }
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * Returns the <code>char</code> value in this sequence at the specified index.
jaroslav@56:      * The first <code>char</code> value is at index <code>0</code>, the next at index
jaroslav@56:      * <code>1</code>, and so on, as in array indexing.
jaroslav@56:      * <p>
jaroslav@56:      * The index argument must be greater than or equal to
jaroslav@56:      * <code>0</code>, and less than the length of this sequence.
jaroslav@56:      *
jaroslav@56:      * <p>If the <code>char</code> value specified by the index is a
jaroslav@56:      * <a href="Character.html#unicode">surrogate</a>, the surrogate
jaroslav@56:      * value is returned.
jaroslav@56:      *
jaroslav@56:      * @param      index   the index of the desired <code>char</code> value.
jaroslav@56:      * @return     the <code>char</code> value at the specified index.
jaroslav@56:      * @throws     IndexOutOfBoundsException  if <code>index</code> is
jaroslav@56:      *             negative or greater than or equal to <code>length()</code>.
jaroslav@56:      */
jaroslav@56:     public char charAt(int index) {
jaroslav@56:         if ((index < 0) || (index >= count))
jaroslav@56:             throw new StringIndexOutOfBoundsException(index);
jaroslav@56:         return value[index];
jaroslav@56:     }
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * Returns the character (Unicode code point) at the specified
jaroslav@56:      * index. The index refers to <code>char</code> values
jaroslav@56:      * (Unicode code units) and ranges from <code>0</code> to
jaroslav@56:      * {@link #length()}<code> - 1</code>.
jaroslav@56:      *
jaroslav@56:      * <p> If the <code>char</code> value specified at the given index
jaroslav@56:      * is in the high-surrogate range, the following index is less
jaroslav@56:      * than the length of this sequence, and the
jaroslav@56:      * <code>char</code> value at the following index is in the
jaroslav@56:      * low-surrogate range, then the supplementary code point
jaroslav@56:      * corresponding to this surrogate pair is returned. Otherwise,
jaroslav@56:      * the <code>char</code> value at the given index is returned.
jaroslav@56:      *
jaroslav@56:      * @param      index the index to the <code>char</code> values
jaroslav@56:      * @return     the code point value of the character at the
jaroslav@56:      *             <code>index</code>
jaroslav@56:      * @exception  IndexOutOfBoundsException  if the <code>index</code>
jaroslav@56:      *             argument is negative or not less than the length of this
jaroslav@56:      *             sequence.
jaroslav@56:      */
jaroslav@56:     public int codePointAt(int index) {
jaroslav@56:         if ((index < 0) || (index >= count)) {
jaroslav@56:             throw new StringIndexOutOfBoundsException(index);
jaroslav@56:         }
jaroslav@56:         return Character.codePointAt(value, index);
jaroslav@56:     }
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * Returns the character (Unicode code point) before the specified
jaroslav@56:      * index. The index refers to <code>char</code> values
jaroslav@56:      * (Unicode code units) and ranges from <code>1</code> to {@link
jaroslav@56:      * #length()}.
jaroslav@56:      *
jaroslav@56:      * <p> If the <code>char</code> value at <code>(index - 1)</code>
jaroslav@56:      * is in the low-surrogate range, <code>(index - 2)</code> is not
jaroslav@56:      * negative, and the <code>char</code> value at <code>(index -
jaroslav@56:      * 2)</code> is in the high-surrogate range, then the
jaroslav@56:      * supplementary code point value of the surrogate pair is
jaroslav@56:      * returned. If the <code>char</code> value at <code>index -
jaroslav@56:      * 1</code> is an unpaired low-surrogate or a high-surrogate, the
jaroslav@56:      * surrogate value is returned.
jaroslav@56:      *
jaroslav@56:      * @param     index the index following the code point that should be returned
jaroslav@56:      * @return    the Unicode code point value before the given index.
jaroslav@56:      * @exception IndexOutOfBoundsException if the <code>index</code>
jaroslav@56:      *            argument is less than 1 or greater than the length
jaroslav@56:      *            of this sequence.
jaroslav@56:      */
jaroslav@56:     public int codePointBefore(int index) {
jaroslav@56:         int i = index - 1;
jaroslav@56:         if ((i < 0) || (i >= count)) {
jaroslav@56:             throw new StringIndexOutOfBoundsException(index);
jaroslav@56:         }
jaroslav@56:         return Character.codePointBefore(value, index);
jaroslav@56:     }
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * Returns the number of Unicode code points in the specified text
jaroslav@56:      * range of this sequence. The text range begins at the specified
jaroslav@56:      * <code>beginIndex</code> and extends to the <code>char</code> at
jaroslav@56:      * index <code>endIndex - 1</code>. Thus the length (in
jaroslav@56:      * <code>char</code>s) of the text range is
jaroslav@56:      * <code>endIndex-beginIndex</code>. Unpaired surrogates within
jaroslav@56:      * this sequence count as one code point each.
jaroslav@56:      *
jaroslav@56:      * @param beginIndex the index to the first <code>char</code> of
jaroslav@56:      * the text range.
jaroslav@56:      * @param endIndex the index after the last <code>char</code> of
jaroslav@56:      * the text range.
jaroslav@56:      * @return the number of Unicode code points in the specified text
jaroslav@56:      * range
jaroslav@56:      * @exception IndexOutOfBoundsException if the
jaroslav@56:      * <code>beginIndex</code> is negative, or <code>endIndex</code>
jaroslav@56:      * is larger than the length of this sequence, or
jaroslav@56:      * <code>beginIndex</code> is larger than <code>endIndex</code>.
jaroslav@56:      */
jaroslav@56:     public int codePointCount(int beginIndex, int endIndex) {
jaroslav@56:         if (beginIndex < 0 || endIndex > count || beginIndex > endIndex) {
jaroslav@56:             throw new IndexOutOfBoundsException();
jaroslav@56:         }
jaroslav@56:         return Character.codePointCountImpl(value, beginIndex, endIndex-beginIndex);
jaroslav@56:     }
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * Returns the index within this sequence that is offset from the
jaroslav@56:      * given <code>index</code> by <code>codePointOffset</code> code
jaroslav@56:      * points. Unpaired surrogates within the text range given by
jaroslav@56:      * <code>index</code> and <code>codePointOffset</code> count as
jaroslav@56:      * one code point each.
jaroslav@56:      *
jaroslav@56:      * @param index the index to be offset
jaroslav@56:      * @param codePointOffset the offset in code points
jaroslav@56:      * @return the index within this sequence
jaroslav@56:      * @exception IndexOutOfBoundsException if <code>index</code>
jaroslav@56:      *   is negative or larger then the length of this sequence,
jaroslav@56:      *   or if <code>codePointOffset</code> is positive and the subsequence
jaroslav@56:      *   starting with <code>index</code> has fewer than
jaroslav@56:      *   <code>codePointOffset</code> code points,
jaroslav@56:      *   or if <code>codePointOffset</code> is negative and the subsequence
jaroslav@56:      *   before <code>index</code> has fewer than the absolute value of
jaroslav@56:      *   <code>codePointOffset</code> code points.
jaroslav@56:      */
jaroslav@56:     public int offsetByCodePoints(int index, int codePointOffset) {
jaroslav@56:         if (index < 0 || index > count) {
jaroslav@56:             throw new IndexOutOfBoundsException();
jaroslav@56:         }
jaroslav@56:         return Character.offsetByCodePointsImpl(value, 0, count,
jaroslav@56:                                                 index, codePointOffset);
jaroslav@56:     }
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * Characters are copied from this sequence into the
jaroslav@56:      * destination character array <code>dst</code>. The first character to
jaroslav@56:      * be copied is at index <code>srcBegin</code>; the last character to
jaroslav@56:      * be copied is at index <code>srcEnd-1</code>. The total number of
jaroslav@56:      * characters to be copied is <code>srcEnd-srcBegin</code>. The
jaroslav@56:      * characters are copied into the subarray of <code>dst</code> starting
jaroslav@56:      * at index <code>dstBegin</code> and ending at index:
jaroslav@56:      * <p><blockquote><pre>
jaroslav@56:      * dstbegin + (srcEnd-srcBegin) - 1
jaroslav@56:      * </pre></blockquote>
jaroslav@56:      *
jaroslav@56:      * @param      srcBegin   start copying at this offset.
jaroslav@56:      * @param      srcEnd     stop copying at this offset.
jaroslav@56:      * @param      dst        the array to copy the data into.
jaroslav@56:      * @param      dstBegin   offset into <code>dst</code>.
jaroslav@56:      * @throws     NullPointerException if <code>dst</code> is
jaroslav@56:      *             <code>null</code>.
jaroslav@56:      * @throws     IndexOutOfBoundsException  if any of the following is true:
jaroslav@56:      *             <ul>
jaroslav@56:      *             <li><code>srcBegin</code> is negative
jaroslav@56:      *             <li><code>dstBegin</code> is negative
jaroslav@56:      *             <li>the <code>srcBegin</code> argument is greater than
jaroslav@56:      *             the <code>srcEnd</code> argument.
jaroslav@56:      *             <li><code>srcEnd</code> is greater than
jaroslav@56:      *             <code>this.length()</code>.
jaroslav@56:      *             <li><code>dstBegin+srcEnd-srcBegin</code> is greater than
jaroslav@56:      *             <code>dst.length</code>
jaroslav@56:      *             </ul>
jaroslav@56:      */
jaroslav@56:     public void getChars(int srcBegin, int srcEnd, char[] dst, int dstBegin)
jaroslav@56:     {
jaroslav@56:         if (srcBegin < 0)
jaroslav@56:             throw new StringIndexOutOfBoundsException(srcBegin);
jaroslav@56:         if ((srcEnd < 0) || (srcEnd > count))
jaroslav@56:             throw new StringIndexOutOfBoundsException(srcEnd);
jaroslav@56:         if (srcBegin > srcEnd)
jaroslav@56:             throw new StringIndexOutOfBoundsException("srcBegin > srcEnd");
jaroslav@104:         arraycopy(value, srcBegin, dst, dstBegin, srcEnd - srcBegin);
jaroslav@56:     }
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * The character at the specified index is set to <code>ch</code>. This
jaroslav@56:      * sequence is altered to represent a new character sequence that is
jaroslav@56:      * identical to the old character sequence, except that it contains the
jaroslav@56:      * character <code>ch</code> at position <code>index</code>.
jaroslav@56:      * <p>
jaroslav@56:      * The index argument must be greater than or equal to
jaroslav@56:      * <code>0</code>, and less than the length of this sequence.
jaroslav@56:      *
jaroslav@56:      * @param      index   the index of the character to modify.
jaroslav@56:      * @param      ch      the new character.
jaroslav@56:      * @throws     IndexOutOfBoundsException  if <code>index</code> is
jaroslav@56:      *             negative or greater than or equal to <code>length()</code>.
jaroslav@56:      */
jaroslav@56:     public void setCharAt(int index, char ch) {
jaroslav@56:         if ((index < 0) || (index >= count))
jaroslav@56:             throw new StringIndexOutOfBoundsException(index);
jaroslav@56:         value[index] = ch;
jaroslav@56:     }
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * Appends the string representation of the {@code Object} argument.
jaroslav@56:      * <p>
jaroslav@56:      * The overall effect is exactly as if the argument were converted
jaroslav@56:      * to a string by the method {@link String#valueOf(Object)},
jaroslav@56:      * and the characters of that string were then
jaroslav@56:      * {@link #append(String) appended} to this character sequence.
jaroslav@56:      *
jaroslav@56:      * @param   obj   an {@code Object}.
jaroslav@56:      * @return  a reference to this object.
jaroslav@56:      */
jaroslav@56:     public AbstractStringBuilder append(Object obj) {
jaroslav@56:         return append(String.valueOf(obj));
jaroslav@56:     }
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * Appends the specified string to this character sequence.
jaroslav@56:      * <p>
jaroslav@56:      * The characters of the {@code String} argument are appended, in
jaroslav@56:      * order, increasing the length of this sequence by the length of the
jaroslav@56:      * argument. If {@code str} is {@code null}, then the four
jaroslav@56:      * characters {@code "null"} are appended.
jaroslav@56:      * <p>
jaroslav@56:      * Let <i>n</i> be the length of this character sequence just prior to
jaroslav@56:      * execution of the {@code append} method. Then the character at
jaroslav@56:      * index <i>k</i> in the new character sequence is equal to the character
jaroslav@56:      * at index <i>k</i> in the old character sequence, if <i>k</i> is less
jaroslav@56:      * than <i>n</i>; otherwise, it is equal to the character at index
jaroslav@56:      * <i>k-n</i> in the argument {@code str}.
jaroslav@56:      *
jaroslav@56:      * @param   str   a string.
jaroslav@56:      * @return  a reference to this object.
jaroslav@56:      */
jaroslav@56:     public AbstractStringBuilder append(String str) {
jaroslav@56:         if (str == null) str = "null";
jaroslav@56:         int len = str.length();
jaroslav@56:         ensureCapacityInternal(count + len);
jaroslav@56:         str.getChars(0, len, value, count);
jaroslav@56:         count += len;
jaroslav@56:         return this;
jaroslav@56:     }
jaroslav@56: 
jaroslav@56:     // Documentation in subclasses because of synchro difference
jaroslav@56:     public AbstractStringBuilder append(StringBuffer sb) {
jaroslav@56:         if (sb == null)
jaroslav@56:             return append("null");
jaroslav@56:         int len = sb.length();
jaroslav@56:         ensureCapacityInternal(count + len);
jaroslav@56:         sb.getChars(0, len, value, count);
jaroslav@56:         count += len;
jaroslav@56:         return this;
jaroslav@56:     }
jaroslav@56: 
jaroslav@56:     // Documentation in subclasses because of synchro difference
jaroslav@56:     public AbstractStringBuilder append(CharSequence s) {
jaroslav@56:         if (s == null)
jaroslav@56:             s = "null";
jaroslav@56:         if (s instanceof String)
jaroslav@56:             return this.append((String)s);
jaroslav@56:         if (s instanceof StringBuffer)
jaroslav@56:             return this.append((StringBuffer)s);
jaroslav@56:         return this.append(s, 0, s.length());
jaroslav@56:     }
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * Appends a subsequence of the specified {@code CharSequence} to this
jaroslav@56:      * sequence.
jaroslav@56:      * <p>
jaroslav@56:      * Characters of the argument {@code s}, starting at
jaroslav@56:      * index {@code start}, are appended, in order, to the contents of
jaroslav@56:      * this sequence up to the (exclusive) index {@code end}. The length
jaroslav@56:      * of this sequence is increased by the value of {@code end - start}.
jaroslav@56:      * <p>
jaroslav@56:      * Let <i>n</i> be the length of this character sequence just prior to
jaroslav@56:      * execution of the {@code append} method. Then the character at
jaroslav@56:      * index <i>k</i> in this character sequence becomes equal to the
jaroslav@56:      * character at index <i>k</i> in this sequence, if <i>k</i> is less than
jaroslav@56:      * <i>n</i>; otherwise, it is equal to the character at index
jaroslav@56:      * <i>k+start-n</i> in the argument {@code s}.
jaroslav@56:      * <p>
jaroslav@56:      * If {@code s} is {@code null}, then this method appends
jaroslav@56:      * characters as if the s parameter was a sequence containing the four
jaroslav@56:      * characters {@code "null"}.
jaroslav@56:      *
jaroslav@56:      * @param   s the sequence to append.
jaroslav@56:      * @param   start   the starting index of the subsequence to be appended.
jaroslav@56:      * @param   end     the end index of the subsequence to be appended.
jaroslav@56:      * @return  a reference to this object.
jaroslav@56:      * @throws     IndexOutOfBoundsException if
jaroslav@56:      *             {@code start} is negative, or
jaroslav@56:      *             {@code start} is greater than {@code end} or
jaroslav@56:      *             {@code end} is greater than {@code s.length()}
jaroslav@56:      */
jaroslav@56:     public AbstractStringBuilder append(CharSequence s, int start, int end) {
jaroslav@56:         if (s == null)
jaroslav@56:             s = "null";
jaroslav@56:         if ((start < 0) || (start > end) || (end > s.length()))
jaroslav@56:             throw new IndexOutOfBoundsException(
jaroslav@56:                 "start " + start + ", end " + end + ", s.length() "
jaroslav@56:                 + s.length());
jaroslav@56:         int len = end - start;
jaroslav@56:         ensureCapacityInternal(count + len);
jaroslav@56:         for (int i = start, j = count; i < end; i++, j++)
jaroslav@56:             value[j] = s.charAt(i);
jaroslav@56:         count += len;
jaroslav@56:         return this;
jaroslav@56:     }
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * Appends the string representation of the {@code char} array
jaroslav@56:      * argument to this sequence.
jaroslav@56:      * <p>
jaroslav@56:      * The characters of the array argument are appended, in order, to
jaroslav@56:      * the contents of this sequence. The length of this sequence
jaroslav@56:      * increases by the length of the argument.
jaroslav@56:      * <p>
jaroslav@56:      * The overall effect is exactly as if the argument were converted
jaroslav@56:      * to a string by the method {@link String#valueOf(char[])},
jaroslav@56:      * and the characters of that string were then
jaroslav@56:      * {@link #append(String) appended} to this character sequence.
jaroslav@56:      *
jaroslav@56:      * @param   str   the characters to be appended.
jaroslav@56:      * @return  a reference to this object.
jaroslav@56:      */
jaroslav@56:     public AbstractStringBuilder append(char[] str) {
jaroslav@56:         int len = str.length;
jaroslav@56:         ensureCapacityInternal(count + len);
jaroslav@104:         arraycopy(str, 0, value, count, len);
jaroslav@56:         count += len;
jaroslav@56:         return this;
jaroslav@56:     }
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * Appends the string representation of a subarray of the
jaroslav@56:      * {@code char} array argument to this sequence.
jaroslav@56:      * <p>
jaroslav@56:      * Characters of the {@code char} array {@code str}, starting at
jaroslav@56:      * index {@code offset}, are appended, in order, to the contents
jaroslav@56:      * of this sequence. The length of this sequence increases
jaroslav@56:      * by the value of {@code len}.
jaroslav@56:      * <p>
jaroslav@56:      * The overall effect is exactly as if the arguments were converted
jaroslav@56:      * to a string by the method {@link String#valueOf(char[],int,int)},
jaroslav@56:      * and the characters of that string were then
jaroslav@56:      * {@link #append(String) appended} to this character sequence.
jaroslav@56:      *
jaroslav@56:      * @param   str      the characters to be appended.
jaroslav@56:      * @param   offset   the index of the first {@code char} to append.
jaroslav@56:      * @param   len      the number of {@code char}s to append.
jaroslav@56:      * @return  a reference to this object.
jaroslav@56:      * @throws IndexOutOfBoundsException
jaroslav@56:      *         if {@code offset < 0} or {@code len < 0}
jaroslav@56:      *         or {@code offset+len > str.length}
jaroslav@56:      */
jaroslav@56:     public AbstractStringBuilder append(char str[], int offset, int len) {
jaroslav@56:         if (len > 0)                // let arraycopy report AIOOBE for len < 0
jaroslav@56:             ensureCapacityInternal(count + len);
jaroslav@104:         arraycopy(str, offset, value, count, len);
jaroslav@56:         count += len;
jaroslav@56:         return this;
jaroslav@56:     }
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * Appends the string representation of the {@code boolean}
jaroslav@56:      * argument to the sequence.
jaroslav@56:      * <p>
jaroslav@56:      * The overall effect is exactly as if the argument were converted
jaroslav@56:      * to a string by the method {@link String#valueOf(boolean)},
jaroslav@56:      * and the characters of that string were then
jaroslav@56:      * {@link #append(String) appended} to this character sequence.
jaroslav@56:      *
jaroslav@56:      * @param   b   a {@code boolean}.
jaroslav@56:      * @return  a reference to this object.
jaroslav@56:      */
jaroslav@56:     public AbstractStringBuilder append(boolean b) {
jaroslav@56:         if (b) {
jaroslav@56:             ensureCapacityInternal(count + 4);
jaroslav@56:             value[count++] = 't';
jaroslav@56:             value[count++] = 'r';
jaroslav@56:             value[count++] = 'u';
jaroslav@56:             value[count++] = 'e';
jaroslav@56:         } else {
jaroslav@56:             ensureCapacityInternal(count + 5);
jaroslav@56:             value[count++] = 'f';
jaroslav@56:             value[count++] = 'a';
jaroslav@56:             value[count++] = 'l';
jaroslav@56:             value[count++] = 's';
jaroslav@56:             value[count++] = 'e';
jaroslav@56:         }
jaroslav@56:         return this;
jaroslav@56:     }
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * Appends the string representation of the {@code char}
jaroslav@56:      * argument to this sequence.
jaroslav@56:      * <p>
jaroslav@56:      * The argument is appended to the contents of this sequence.
jaroslav@56:      * The length of this sequence increases by {@code 1}.
jaroslav@56:      * <p>
jaroslav@56:      * The overall effect is exactly as if the argument were converted
jaroslav@56:      * to a string by the method {@link String#valueOf(char)},
jaroslav@56:      * and the character in that string were then
jaroslav@56:      * {@link #append(String) appended} to this character sequence.
jaroslav@56:      *
jaroslav@56:      * @param   c   a {@code char}.
jaroslav@56:      * @return  a reference to this object.
jaroslav@56:      */
jaroslav@56:     public AbstractStringBuilder append(char c) {
jaroslav@56:         ensureCapacityInternal(count + 1);
jaroslav@56:         value[count++] = c;
jaroslav@56:         return this;
jaroslav@56:     }
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * Appends the string representation of the {@code int}
jaroslav@56:      * argument to this sequence.
jaroslav@56:      * <p>
jaroslav@56:      * The overall effect is exactly as if the argument were converted
jaroslav@56:      * to a string by the method {@link String#valueOf(int)},
jaroslav@56:      * and the characters of that string were then
jaroslav@56:      * {@link #append(String) appended} to this character sequence.
jaroslav@56:      *
jaroslav@56:      * @param   i   an {@code int}.
jaroslav@56:      * @return  a reference to this object.
jaroslav@56:      */
jaroslav@94:     @JavaScriptBody(
jaroslav@94:         args={ "self", "i" },
jaroslav@94:         body="return java_lang_AbstractStringBuilder_appendLjava_lang_AbstractStringBuilderLjava_lang_String(self,i.toString());"
jaroslav@94:     )
jaroslav@56:     public AbstractStringBuilder append(int i) {
jaroslav@56:         if (i == Integer.MIN_VALUE) {
jaroslav@56:             append("-2147483648");
jaroslav@56:             return this;
jaroslav@56:         }
jaroslav@56:         int appendedLength = (i < 0) ? Integer.stringSize(-i) + 1
jaroslav@56:                                      : Integer.stringSize(i);
jaroslav@56:         int spaceNeeded = count + appendedLength;
jaroslav@56:         ensureCapacityInternal(spaceNeeded);
jaroslav@56:         Integer.getChars(i, spaceNeeded, value);
jaroslav@56:         count = spaceNeeded;
jaroslav@56:         return this;
jaroslav@56:     }
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * Appends the string representation of the {@code long}
jaroslav@56:      * argument to this sequence.
jaroslav@56:      * <p>
jaroslav@56:      * The overall effect is exactly as if the argument were converted
jaroslav@56:      * to a string by the method {@link String#valueOf(long)},
jaroslav@56:      * and the characters of that string were then
jaroslav@56:      * {@link #append(String) appended} to this character sequence.
jaroslav@56:      *
jaroslav@56:      * @param   l   a {@code long}.
jaroslav@56:      * @return  a reference to this object.
jaroslav@56:      */
jaroslav@56:     public AbstractStringBuilder append(long l) {
jaroslav@56:         if (l == Long.MIN_VALUE) {
jaroslav@56:             append("-9223372036854775808");
jaroslav@56:             return this;
jaroslav@56:         }
jaroslav@56:         int appendedLength = (l < 0) ? Long.stringSize(-l) + 1
jaroslav@56:                                      : Long.stringSize(l);
jaroslav@56:         int spaceNeeded = count + appendedLength;
jaroslav@56:         ensureCapacityInternal(spaceNeeded);
jaroslav@56:         Long.getChars(l, spaceNeeded, value);
jaroslav@56:         count = spaceNeeded;
jaroslav@56:         return this;
jaroslav@56:     }
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * Appends the string representation of the {@code float}
jaroslav@56:      * argument to this sequence.
jaroslav@56:      * <p>
jaroslav@56:      * The overall effect is exactly as if the argument were converted
jaroslav@56:      * to a string by the method {@link String#valueOf(float)},
jaroslav@56:      * and the characters of that string were then
jaroslav@56:      * {@link #append(String) appended} to this character sequence.
jaroslav@56:      *
jaroslav@56:      * @param   f   a {@code float}.
jaroslav@56:      * @return  a reference to this object.
jaroslav@56:      */
jaroslav@56:     public AbstractStringBuilder append(float f) {
jaroslav@116:         return append(Float.toString(f));
jaroslav@56:     }
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * Appends the string representation of the {@code double}
jaroslav@56:      * argument to this sequence.
jaroslav@56:      * <p>
jaroslav@56:      * The overall effect is exactly as if the argument were converted
jaroslav@56:      * to a string by the method {@link String#valueOf(double)},
jaroslav@56:      * and the characters of that string were then
jaroslav@56:      * {@link #append(String) appended} to this character sequence.
jaroslav@56:      *
jaroslav@56:      * @param   d   a {@code double}.
jaroslav@56:      * @return  a reference to this object.
jaroslav@56:      */
jaroslav@56:     public AbstractStringBuilder append(double d) {
jaroslav@116:         return append(Double.toString(d));
jaroslav@56:     }
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * Removes the characters in a substring of this sequence.
jaroslav@56:      * The substring begins at the specified {@code start} and extends to
jaroslav@56:      * the character at index {@code end - 1} or to the end of the
jaroslav@56:      * sequence if no such character exists. If
jaroslav@56:      * {@code start} is equal to {@code end}, no changes are made.
jaroslav@56:      *
jaroslav@56:      * @param      start  The beginning index, inclusive.
jaroslav@56:      * @param      end    The ending index, exclusive.
jaroslav@56:      * @return     This object.
jaroslav@56:      * @throws     StringIndexOutOfBoundsException  if {@code start}
jaroslav@56:      *             is negative, greater than {@code length()}, or
jaroslav@56:      *             greater than {@code end}.
jaroslav@56:      */
jaroslav@56:     public AbstractStringBuilder delete(int start, int end) {
jaroslav@56:         if (start < 0)
jaroslav@56:             throw new StringIndexOutOfBoundsException(start);
jaroslav@56:         if (end > count)
jaroslav@56:             end = count;
jaroslav@56:         if (start > end)
jaroslav@56:             throw new StringIndexOutOfBoundsException();
jaroslav@56:         int len = end - start;
jaroslav@56:         if (len > 0) {
jaroslav@104:             arraycopy(value, start+len, value, start, count-end);
jaroslav@56:             count -= len;
jaroslav@56:         }
jaroslav@56:         return this;
jaroslav@56:     }
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * Appends the string representation of the {@code codePoint}
jaroslav@56:      * argument to this sequence.
jaroslav@56:      *
jaroslav@56:      * <p> The argument is appended to the contents of this sequence.
jaroslav@56:      * The length of this sequence increases by
jaroslav@56:      * {@link Character#charCount(int) Character.charCount(codePoint)}.
jaroslav@56:      *
jaroslav@56:      * <p> The overall effect is exactly as if the argument were
jaroslav@56:      * converted to a {@code char} array by the method
jaroslav@56:      * {@link Character#toChars(int)} and the character in that array
jaroslav@56:      * were then {@link #append(char[]) appended} to this character
jaroslav@56:      * sequence.
jaroslav@56:      *
jaroslav@56:      * @param   codePoint   a Unicode code point
jaroslav@56:      * @return  a reference to this object.
jaroslav@56:      * @exception IllegalArgumentException if the specified
jaroslav@56:      * {@code codePoint} isn't a valid Unicode code point
jaroslav@56:      */
jaroslav@56:     public AbstractStringBuilder appendCodePoint(int codePoint) {
jaroslav@56:         final int count = this.count;
jaroslav@56: 
jaroslav@56:         if (Character.isBmpCodePoint(codePoint)) {
jaroslav@56:             ensureCapacityInternal(count + 1);
jaroslav@56:             value[count] = (char) codePoint;
jaroslav@56:             this.count = count + 1;
jaroslav@56:         } else if (Character.isValidCodePoint(codePoint)) {
jaroslav@56:             ensureCapacityInternal(count + 2);
jaroslav@56:             Character.toSurrogates(codePoint, value, count);
jaroslav@56:             this.count = count + 2;
jaroslav@56:         } else {
jaroslav@56:             throw new IllegalArgumentException();
jaroslav@56:         }
jaroslav@56:         return this;
jaroslav@56:     }
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * Removes the <code>char</code> at the specified position in this
jaroslav@56:      * sequence. This sequence is shortened by one <code>char</code>.
jaroslav@56:      *
jaroslav@56:      * <p>Note: If the character at the given index is a supplementary
jaroslav@56:      * character, this method does not remove the entire character. If
jaroslav@56:      * correct handling of supplementary characters is required,
jaroslav@56:      * determine the number of <code>char</code>s to remove by calling
jaroslav@56:      * <code>Character.charCount(thisSequence.codePointAt(index))</code>,
jaroslav@56:      * where <code>thisSequence</code> is this sequence.
jaroslav@56:      *
jaroslav@56:      * @param       index  Index of <code>char</code> to remove
jaroslav@56:      * @return      This object.
jaroslav@56:      * @throws      StringIndexOutOfBoundsException  if the <code>index</code>
jaroslav@56:      *              is negative or greater than or equal to
jaroslav@56:      *              <code>length()</code>.
jaroslav@56:      */
jaroslav@56:     public AbstractStringBuilder deleteCharAt(int index) {
jaroslav@56:         if ((index < 0) || (index >= count))
jaroslav@56:             throw new StringIndexOutOfBoundsException(index);
jaroslav@104:         arraycopy(value, index+1, value, index, count-index-1);
jaroslav@56:         count--;
jaroslav@56:         return this;
jaroslav@56:     }
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * Replaces the characters in a substring of this sequence
jaroslav@56:      * with characters in the specified <code>String</code>. The substring
jaroslav@56:      * begins at the specified <code>start</code> and extends to the character
jaroslav@56:      * at index <code>end - 1</code> or to the end of the
jaroslav@56:      * sequence if no such character exists. First the
jaroslav@56:      * characters in the substring are removed and then the specified
jaroslav@56:      * <code>String</code> is inserted at <code>start</code>. (This
jaroslav@56:      * sequence will be lengthened to accommodate the
jaroslav@56:      * specified String if necessary.)
jaroslav@56:      *
jaroslav@56:      * @param      start    The beginning index, inclusive.
jaroslav@56:      * @param      end      The ending index, exclusive.
jaroslav@56:      * @param      str   String that will replace previous contents.
jaroslav@56:      * @return     This object.
jaroslav@56:      * @throws     StringIndexOutOfBoundsException  if <code>start</code>
jaroslav@56:      *             is negative, greater than <code>length()</code>, or
jaroslav@56:      *             greater than <code>end</code>.
jaroslav@56:      */
jaroslav@56:     public AbstractStringBuilder replace(int start, int end, String str) {
jaroslav@56:         if (start < 0)
jaroslav@56:             throw new StringIndexOutOfBoundsException(start);
jaroslav@56:         if (start > count)
jaroslav@56:             throw new StringIndexOutOfBoundsException("start > length()");
jaroslav@56:         if (start > end)
jaroslav@56:             throw new StringIndexOutOfBoundsException("start > end");
jaroslav@56: 
jaroslav@56:         if (end > count)
jaroslav@56:             end = count;
jaroslav@56:         int len = str.length();
jaroslav@56:         int newCount = count + len - (end - start);
jaroslav@56:         ensureCapacityInternal(newCount);
jaroslav@56: 
jaroslav@104:         arraycopy(value, end, value, start + len, count - end);
jaroslav@56:         str.getChars(value, start);
jaroslav@56:         count = newCount;
jaroslav@56:         return this;
jaroslav@56:     }
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * Returns a new <code>String</code> that contains a subsequence of
jaroslav@56:      * characters currently contained in this character sequence. The
jaroslav@56:      * substring begins at the specified index and extends to the end of
jaroslav@56:      * this sequence.
jaroslav@56:      *
jaroslav@56:      * @param      start    The beginning index, inclusive.
jaroslav@56:      * @return     The new string.
jaroslav@56:      * @throws     StringIndexOutOfBoundsException  if <code>start</code> is
jaroslav@56:      *             less than zero, or greater than the length of this object.
jaroslav@56:      */
jaroslav@56:     public String substring(int start) {
jaroslav@56:         return substring(start, count);
jaroslav@56:     }
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * Returns a new character sequence that is a subsequence of this sequence.
jaroslav@56:      *
jaroslav@56:      * <p> An invocation of this method of the form
jaroslav@56:      *
jaroslav@56:      * <blockquote><pre>
jaroslav@56:      * sb.subSequence(begin,&nbsp;end)</pre></blockquote>
jaroslav@56:      *
jaroslav@56:      * behaves in exactly the same way as the invocation
jaroslav@56:      *
jaroslav@56:      * <blockquote><pre>
jaroslav@56:      * sb.substring(begin,&nbsp;end)</pre></blockquote>
jaroslav@56:      *
jaroslav@56:      * This method is provided so that this class can
jaroslav@56:      * implement the {@link CharSequence} interface. </p>
jaroslav@56:      *
jaroslav@56:      * @param      start   the start index, inclusive.
jaroslav@56:      * @param      end     the end index, exclusive.
jaroslav@56:      * @return     the specified subsequence.
jaroslav@56:      *
jaroslav@56:      * @throws  IndexOutOfBoundsException
jaroslav@56:      *          if <tt>start</tt> or <tt>end</tt> are negative,
jaroslav@56:      *          if <tt>end</tt> is greater than <tt>length()</tt>,
jaroslav@56:      *          or if <tt>start</tt> is greater than <tt>end</tt>
jaroslav@56:      * @spec JSR-51
jaroslav@56:      */
jaroslav@56:     public CharSequence subSequence(int start, int end) {
jaroslav@56:         return substring(start, end);
jaroslav@56:     }
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * Returns a new <code>String</code> that contains a subsequence of
jaroslav@56:      * characters currently contained in this sequence. The
jaroslav@56:      * substring begins at the specified <code>start</code> and
jaroslav@56:      * extends to the character at index <code>end - 1</code>.
jaroslav@56:      *
jaroslav@56:      * @param      start    The beginning index, inclusive.
jaroslav@56:      * @param      end      The ending index, exclusive.
jaroslav@56:      * @return     The new string.
jaroslav@56:      * @throws     StringIndexOutOfBoundsException  if <code>start</code>
jaroslav@56:      *             or <code>end</code> are negative or greater than
jaroslav@56:      *             <code>length()</code>, or <code>start</code> is
jaroslav@56:      *             greater than <code>end</code>.
jaroslav@56:      */
jaroslav@56:     public String substring(int start, int end) {
jaroslav@56:         if (start < 0)
jaroslav@56:             throw new StringIndexOutOfBoundsException(start);
jaroslav@56:         if (end > count)
jaroslav@56:             throw new StringIndexOutOfBoundsException(end);
jaroslav@56:         if (start > end)
jaroslav@56:             throw new StringIndexOutOfBoundsException(end - start);
jaroslav@56:         return new String(value, start, end - start);
jaroslav@56:     }
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * Inserts the string representation of a subarray of the {@code str}
jaroslav@56:      * array argument into this sequence. The subarray begins at the
jaroslav@56:      * specified {@code offset} and extends {@code len} {@code char}s.
jaroslav@56:      * The characters of the subarray are inserted into this sequence at
jaroslav@56:      * the position indicated by {@code index}. The length of this
jaroslav@56:      * sequence increases by {@code len} {@code char}s.
jaroslav@56:      *
jaroslav@56:      * @param      index    position at which to insert subarray.
jaroslav@56:      * @param      str       A {@code char} array.
jaroslav@56:      * @param      offset   the index of the first {@code char} in subarray to
jaroslav@56:      *             be inserted.
jaroslav@56:      * @param      len      the number of {@code char}s in the subarray to
jaroslav@56:      *             be inserted.
jaroslav@56:      * @return     This object
jaroslav@56:      * @throws     StringIndexOutOfBoundsException  if {@code index}
jaroslav@56:      *             is negative or greater than {@code length()}, or
jaroslav@56:      *             {@code offset} or {@code len} are negative, or
jaroslav@56:      *             {@code (offset+len)} is greater than
jaroslav@56:      *             {@code str.length}.
jaroslav@56:      */
jaroslav@56:     public AbstractStringBuilder insert(int index, char[] str, int offset,
jaroslav@56:                                         int len)
jaroslav@56:     {
jaroslav@56:         if ((index < 0) || (index > length()))
jaroslav@56:             throw new StringIndexOutOfBoundsException(index);
jaroslav@56:         if ((offset < 0) || (len < 0) || (offset > str.length - len))
jaroslav@56:             throw new StringIndexOutOfBoundsException(
jaroslav@56:                 "offset " + offset + ", len " + len + ", str.length "
jaroslav@56:                 + str.length);
jaroslav@56:         ensureCapacityInternal(count + len);
jaroslav@104:         arraycopy(value, index, value, index + len, count - index);
jaroslav@104:         arraycopy(str, offset, value, index, len);
jaroslav@56:         count += len;
jaroslav@56:         return this;
jaroslav@56:     }
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * Inserts the string representation of the {@code Object}
jaroslav@56:      * argument into this character sequence.
jaroslav@56:      * <p>
jaroslav@56:      * The overall effect is exactly as if the second argument were
jaroslav@56:      * converted to a string by the method {@link String#valueOf(Object)},
jaroslav@56:      * and the characters of that string were then
jaroslav@56:      * {@link #insert(int,String) inserted} into this character
jaroslav@56:      * sequence at the indicated offset.
jaroslav@56:      * <p>
jaroslav@56:      * The {@code offset} argument must be greater than or equal to
jaroslav@56:      * {@code 0}, and less than or equal to the {@linkplain #length() length}
jaroslav@56:      * of this sequence.
jaroslav@56:      *
jaroslav@56:      * @param      offset   the offset.
jaroslav@56:      * @param      obj      an {@code Object}.
jaroslav@56:      * @return     a reference to this object.
jaroslav@56:      * @throws     StringIndexOutOfBoundsException  if the offset is invalid.
jaroslav@56:      */
jaroslav@56:     public AbstractStringBuilder insert(int offset, Object obj) {
jaroslav@56:         return insert(offset, String.valueOf(obj));
jaroslav@56:     }
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * Inserts the string into this character sequence.
jaroslav@56:      * <p>
jaroslav@56:      * The characters of the {@code String} argument are inserted, in
jaroslav@56:      * order, into this sequence at the indicated offset, moving up any
jaroslav@56:      * characters originally above that position and increasing the length
jaroslav@56:      * of this sequence by the length of the argument. If
jaroslav@56:      * {@code str} is {@code null}, then the four characters
jaroslav@56:      * {@code "null"} are inserted into this sequence.
jaroslav@56:      * <p>
jaroslav@56:      * The character at index <i>k</i> in the new character sequence is
jaroslav@56:      * equal to:
jaroslav@56:      * <ul>
jaroslav@56:      * <li>the character at index <i>k</i> in the old character sequence, if
jaroslav@56:      * <i>k</i> is less than {@code offset}
jaroslav@56:      * <li>the character at index <i>k</i>{@code -offset} in the
jaroslav@56:      * argument {@code str}, if <i>k</i> is not less than
jaroslav@56:      * {@code offset} but is less than {@code offset+str.length()}
jaroslav@56:      * <li>the character at index <i>k</i>{@code -str.length()} in the
jaroslav@56:      * old character sequence, if <i>k</i> is not less than
jaroslav@56:      * {@code offset+str.length()}
jaroslav@56:      * </ul><p>
jaroslav@56:      * The {@code offset} argument must be greater than or equal to
jaroslav@56:      * {@code 0}, and less than or equal to the {@linkplain #length() length}
jaroslav@56:      * of this sequence.
jaroslav@56:      *
jaroslav@56:      * @param      offset   the offset.
jaroslav@56:      * @param      str      a string.
jaroslav@56:      * @return     a reference to this object.
jaroslav@56:      * @throws     StringIndexOutOfBoundsException  if the offset is invalid.
jaroslav@56:      */
jaroslav@56:     public AbstractStringBuilder insert(int offset, String str) {
jaroslav@56:         if ((offset < 0) || (offset > length()))
jaroslav@56:             throw new StringIndexOutOfBoundsException(offset);
jaroslav@56:         if (str == null)
jaroslav@56:             str = "null";
jaroslav@56:         int len = str.length();
jaroslav@56:         ensureCapacityInternal(count + len);
jaroslav@104:         arraycopy(value, offset, value, offset + len, count - offset);
jaroslav@56:         str.getChars(value, offset);
jaroslav@56:         count += len;
jaroslav@56:         return this;
jaroslav@56:     }
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * Inserts the string representation of the {@code char} array
jaroslav@56:      * argument into this sequence.
jaroslav@56:      * <p>
jaroslav@56:      * The characters of the array argument are inserted into the
jaroslav@56:      * contents of this sequence at the position indicated by
jaroslav@56:      * {@code offset}. The length of this sequence increases by
jaroslav@56:      * the length of the argument.
jaroslav@56:      * <p>
jaroslav@56:      * The overall effect is exactly as if the second argument were
jaroslav@56:      * converted to a string by the method {@link String#valueOf(char[])},
jaroslav@56:      * and the characters of that string were then
jaroslav@56:      * {@link #insert(int,String) inserted} into this character
jaroslav@56:      * sequence at the indicated offset.
jaroslav@56:      * <p>
jaroslav@56:      * The {@code offset} argument must be greater than or equal to
jaroslav@56:      * {@code 0}, and less than or equal to the {@linkplain #length() length}
jaroslav@56:      * of this sequence.
jaroslav@56:      *
jaroslav@56:      * @param      offset   the offset.
jaroslav@56:      * @param      str      a character array.
jaroslav@56:      * @return     a reference to this object.
jaroslav@56:      * @throws     StringIndexOutOfBoundsException  if the offset is invalid.
jaroslav@56:      */
jaroslav@56:     public AbstractStringBuilder insert(int offset, char[] str) {
jaroslav@56:         if ((offset < 0) || (offset > length()))
jaroslav@56:             throw new StringIndexOutOfBoundsException(offset);
jaroslav@56:         int len = str.length;
jaroslav@56:         ensureCapacityInternal(count + len);
jaroslav@104:         arraycopy(value, offset, value, offset + len, count - offset);
jaroslav@104:         arraycopy(str, 0, value, offset, len);
jaroslav@56:         count += len;
jaroslav@56:         return this;
jaroslav@56:     }
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * Inserts the specified {@code CharSequence} into this sequence.
jaroslav@56:      * <p>
jaroslav@56:      * The characters of the {@code CharSequence} argument are inserted,
jaroslav@56:      * in order, into this sequence at the indicated offset, moving up
jaroslav@56:      * any characters originally above that position and increasing the length
jaroslav@56:      * of this sequence by the length of the argument s.
jaroslav@56:      * <p>
jaroslav@56:      * The result of this method is exactly the same as if it were an
jaroslav@56:      * invocation of this object's
jaroslav@56:      * {@link #insert(int,CharSequence,int,int) insert}(dstOffset, s, 0, s.length())
jaroslav@56:      * method.
jaroslav@56:      *
jaroslav@56:      * <p>If {@code s} is {@code null}, then the four characters
jaroslav@56:      * {@code "null"} are inserted into this sequence.
jaroslav@56:      *
jaroslav@56:      * @param      dstOffset   the offset.
jaroslav@56:      * @param      s the sequence to be inserted
jaroslav@56:      * @return     a reference to this object.
jaroslav@56:      * @throws     IndexOutOfBoundsException  if the offset is invalid.
jaroslav@56:      */
jaroslav@56:     public AbstractStringBuilder insert(int dstOffset, CharSequence s) {
jaroslav@56:         if (s == null)
jaroslav@56:             s = "null";
jaroslav@56:         if (s instanceof String)
jaroslav@56:             return this.insert(dstOffset, (String)s);
jaroslav@56:         return this.insert(dstOffset, s, 0, s.length());
jaroslav@56:     }
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * Inserts a subsequence of the specified {@code CharSequence} into
jaroslav@56:      * this sequence.
jaroslav@56:      * <p>
jaroslav@56:      * The subsequence of the argument {@code s} specified by
jaroslav@56:      * {@code start} and {@code end} are inserted,
jaroslav@56:      * in order, into this sequence at the specified destination offset, moving
jaroslav@56:      * up any characters originally above that position. The length of this
jaroslav@56:      * sequence is increased by {@code end - start}.
jaroslav@56:      * <p>
jaroslav@56:      * The character at index <i>k</i> in this sequence becomes equal to:
jaroslav@56:      * <ul>
jaroslav@56:      * <li>the character at index <i>k</i> in this sequence, if
jaroslav@56:      * <i>k</i> is less than {@code dstOffset}
jaroslav@56:      * <li>the character at index <i>k</i>{@code +start-dstOffset} in
jaroslav@56:      * the argument {@code s}, if <i>k</i> is greater than or equal to
jaroslav@56:      * {@code dstOffset} but is less than {@code dstOffset+end-start}
jaroslav@56:      * <li>the character at index <i>k</i>{@code -(end-start)} in this
jaroslav@56:      * sequence, if <i>k</i> is greater than or equal to
jaroslav@56:      * {@code dstOffset+end-start}
jaroslav@56:      * </ul><p>
jaroslav@56:      * The {@code dstOffset} argument must be greater than or equal to
jaroslav@56:      * {@code 0}, and less than or equal to the {@linkplain #length() length}
jaroslav@56:      * of this sequence.
jaroslav@56:      * <p>The start argument must be nonnegative, and not greater than
jaroslav@56:      * {@code end}.
jaroslav@56:      * <p>The end argument must be greater than or equal to
jaroslav@56:      * {@code start}, and less than or equal to the length of s.
jaroslav@56:      *
jaroslav@56:      * <p>If {@code s} is {@code null}, then this method inserts
jaroslav@56:      * characters as if the s parameter was a sequence containing the four
jaroslav@56:      * characters {@code "null"}.
jaroslav@56:      *
jaroslav@56:      * @param      dstOffset   the offset in this sequence.
jaroslav@56:      * @param      s       the sequence to be inserted.
jaroslav@56:      * @param      start   the starting index of the subsequence to be inserted.
jaroslav@56:      * @param      end     the end index of the subsequence to be inserted.
jaroslav@56:      * @return     a reference to this object.
jaroslav@56:      * @throws     IndexOutOfBoundsException  if {@code dstOffset}
jaroslav@56:      *             is negative or greater than {@code this.length()}, or
jaroslav@56:      *              {@code start} or {@code end} are negative, or
jaroslav@56:      *              {@code start} is greater than {@code end} or
jaroslav@56:      *              {@code end} is greater than {@code s.length()}
jaroslav@56:      */
jaroslav@56:      public AbstractStringBuilder insert(int dstOffset, CharSequence s,
jaroslav@56:                                          int start, int end) {
jaroslav@56:         if (s == null)
jaroslav@56:             s = "null";
jaroslav@56:         if ((dstOffset < 0) || (dstOffset > this.length()))
jaroslav@56:             throw new IndexOutOfBoundsException("dstOffset "+dstOffset);
jaroslav@56:         if ((start < 0) || (end < 0) || (start > end) || (end > s.length()))
jaroslav@56:             throw new IndexOutOfBoundsException(
jaroslav@56:                 "start " + start + ", end " + end + ", s.length() "
jaroslav@56:                 + s.length());
jaroslav@56:         int len = end - start;
jaroslav@56:         ensureCapacityInternal(count + len);
jaroslav@104:         arraycopy(value, dstOffset, value, dstOffset + len,
jaroslav@56:                          count - dstOffset);
jaroslav@56:         for (int i=start; i<end; i++)
jaroslav@56:             value[dstOffset++] = s.charAt(i);
jaroslav@56:         count += len;
jaroslav@56:         return this;
jaroslav@56:     }
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * Inserts the string representation of the {@code boolean}
jaroslav@56:      * argument into this sequence.
jaroslav@56:      * <p>
jaroslav@56:      * The overall effect is exactly as if the second argument were
jaroslav@56:      * converted to a string by the method {@link String#valueOf(boolean)},
jaroslav@56:      * and the characters of that string were then
jaroslav@56:      * {@link #insert(int,String) inserted} into this character
jaroslav@56:      * sequence at the indicated offset.
jaroslav@56:      * <p>
jaroslav@56:      * The {@code offset} argument must be greater than or equal to
jaroslav@56:      * {@code 0}, and less than or equal to the {@linkplain #length() length}
jaroslav@56:      * of this sequence.
jaroslav@56:      *
jaroslav@56:      * @param      offset   the offset.
jaroslav@56:      * @param      b        a {@code boolean}.
jaroslav@56:      * @return     a reference to this object.
jaroslav@56:      * @throws     StringIndexOutOfBoundsException  if the offset is invalid.
jaroslav@56:      */
jaroslav@56:     public AbstractStringBuilder insert(int offset, boolean b) {
jaroslav@56:         return insert(offset, String.valueOf(b));
jaroslav@56:     }
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * Inserts the string representation of the {@code char}
jaroslav@56:      * argument into this sequence.
jaroslav@56:      * <p>
jaroslav@56:      * The overall effect is exactly as if the second argument were
jaroslav@56:      * converted to a string by the method {@link String#valueOf(char)},
jaroslav@56:      * and the character in that string were then
jaroslav@56:      * {@link #insert(int,String) inserted} into this character
jaroslav@56:      * sequence at the indicated offset.
jaroslav@56:      * <p>
jaroslav@56:      * The {@code offset} argument must be greater than or equal to
jaroslav@56:      * {@code 0}, and less than or equal to the {@linkplain #length() length}
jaroslav@56:      * of this sequence.
jaroslav@56:      *
jaroslav@56:      * @param      offset   the offset.
jaroslav@56:      * @param      c        a {@code char}.
jaroslav@56:      * @return     a reference to this object.
jaroslav@56:      * @throws     IndexOutOfBoundsException  if the offset is invalid.
jaroslav@56:      */
jaroslav@56:     public AbstractStringBuilder insert(int offset, char c) {
jaroslav@56:         ensureCapacityInternal(count + 1);
jaroslav@104:         arraycopy(value, offset, value, offset + 1, count - offset);
jaroslav@56:         value[offset] = c;
jaroslav@56:         count += 1;
jaroslav@56:         return this;
jaroslav@56:     }
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * Inserts the string representation of the second {@code int}
jaroslav@56:      * argument into this sequence.
jaroslav@56:      * <p>
jaroslav@56:      * The overall effect is exactly as if the second argument were
jaroslav@56:      * converted to a string by the method {@link String#valueOf(int)},
jaroslav@56:      * and the characters of that string were then
jaroslav@56:      * {@link #insert(int,String) inserted} into this character
jaroslav@56:      * sequence at the indicated offset.
jaroslav@56:      * <p>
jaroslav@56:      * The {@code offset} argument must be greater than or equal to
jaroslav@56:      * {@code 0}, and less than or equal to the {@linkplain #length() length}
jaroslav@56:      * of this sequence.
jaroslav@56:      *
jaroslav@56:      * @param      offset   the offset.
jaroslav@56:      * @param      i        an {@code int}.
jaroslav@56:      * @return     a reference to this object.
jaroslav@56:      * @throws     StringIndexOutOfBoundsException  if the offset is invalid.
jaroslav@56:      */
jaroslav@56:     public AbstractStringBuilder insert(int offset, int i) {
jaroslav@56:         return insert(offset, String.valueOf(i));
jaroslav@56:     }
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * Inserts the string representation of the {@code long}
jaroslav@56:      * argument into this sequence.
jaroslav@56:      * <p>
jaroslav@56:      * The overall effect is exactly as if the second argument were
jaroslav@56:      * converted to a string by the method {@link String#valueOf(long)},
jaroslav@56:      * and the characters of that string were then
jaroslav@56:      * {@link #insert(int,String) inserted} into this character
jaroslav@56:      * sequence at the indicated offset.
jaroslav@56:      * <p>
jaroslav@56:      * The {@code offset} argument must be greater than or equal to
jaroslav@56:      * {@code 0}, and less than or equal to the {@linkplain #length() length}
jaroslav@56:      * of this sequence.
jaroslav@56:      *
jaroslav@56:      * @param      offset   the offset.
jaroslav@56:      * @param      l        a {@code long}.
jaroslav@56:      * @return     a reference to this object.
jaroslav@56:      * @throws     StringIndexOutOfBoundsException  if the offset is invalid.
jaroslav@56:      */
jaroslav@56:     public AbstractStringBuilder insert(int offset, long l) {
jaroslav@56:         return insert(offset, String.valueOf(l));
jaroslav@56:     }
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * Inserts the string representation of the {@code float}
jaroslav@56:      * argument into this sequence.
jaroslav@56:      * <p>
jaroslav@56:      * The overall effect is exactly as if the second argument were
jaroslav@56:      * converted to a string by the method {@link String#valueOf(float)},
jaroslav@56:      * and the characters of that string were then
jaroslav@56:      * {@link #insert(int,String) inserted} into this character
jaroslav@56:      * sequence at the indicated offset.
jaroslav@56:      * <p>
jaroslav@56:      * The {@code offset} argument must be greater than or equal to
jaroslav@56:      * {@code 0}, and less than or equal to the {@linkplain #length() length}
jaroslav@56:      * of this sequence.
jaroslav@56:      *
jaroslav@56:      * @param      offset   the offset.
jaroslav@56:      * @param      f        a {@code float}.
jaroslav@56:      * @return     a reference to this object.
jaroslav@56:      * @throws     StringIndexOutOfBoundsException  if the offset is invalid.
jaroslav@56:      */
jaroslav@56:     public AbstractStringBuilder insert(int offset, float f) {
jaroslav@56:         return insert(offset, String.valueOf(f));
jaroslav@56:     }
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * Inserts the string representation of the {@code double}
jaroslav@56:      * argument into this sequence.
jaroslav@56:      * <p>
jaroslav@56:      * The overall effect is exactly as if the second argument were
jaroslav@56:      * converted to a string by the method {@link String#valueOf(double)},
jaroslav@56:      * and the characters of that string were then
jaroslav@56:      * {@link #insert(int,String) inserted} into this character
jaroslav@56:      * sequence at the indicated offset.
jaroslav@56:      * <p>
jaroslav@56:      * The {@code offset} argument must be greater than or equal to
jaroslav@56:      * {@code 0}, and less than or equal to the {@linkplain #length() length}
jaroslav@56:      * of this sequence.
jaroslav@56:      *
jaroslav@56:      * @param      offset   the offset.
jaroslav@56:      * @param      d        a {@code double}.
jaroslav@56:      * @return     a reference to this object.
jaroslav@56:      * @throws     StringIndexOutOfBoundsException  if the offset is invalid.
jaroslav@56:      */
jaroslav@56:     public AbstractStringBuilder insert(int offset, double d) {
jaroslav@56:         return insert(offset, String.valueOf(d));
jaroslav@56:     }
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * Returns the index within this string of the first occurrence of the
jaroslav@56:      * specified substring. The integer returned is the smallest value
jaroslav@56:      * <i>k</i> such that:
jaroslav@56:      * <blockquote><pre>
jaroslav@56:      * this.toString().startsWith(str, <i>k</i>)
jaroslav@56:      * </pre></blockquote>
jaroslav@56:      * is <code>true</code>.
jaroslav@56:      *
jaroslav@56:      * @param   str   any string.
jaroslav@56:      * @return  if the string argument occurs as a substring within this
jaroslav@56:      *          object, then the index of the first character of the first
jaroslav@56:      *          such substring is returned; if it does not occur as a
jaroslav@56:      *          substring, <code>-1</code> is returned.
jaroslav@56:      * @throws  java.lang.NullPointerException if <code>str</code> is
jaroslav@56:      *          <code>null</code>.
jaroslav@56:      */
jaroslav@56:     public int indexOf(String str) {
jaroslav@56:         return indexOf(str, 0);
jaroslav@56:     }
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * Returns the index within this string of the first occurrence of the
jaroslav@56:      * specified substring, starting at the specified index.  The integer
jaroslav@56:      * returned is the smallest value <tt>k</tt> for which:
jaroslav@56:      * <blockquote><pre>
jaroslav@56:      *     k >= Math.min(fromIndex, str.length()) &&
jaroslav@56:      *                   this.toString().startsWith(str, k)
jaroslav@56:      * </pre></blockquote>
jaroslav@56:      * If no such value of <i>k</i> exists, then -1 is returned.
jaroslav@56:      *
jaroslav@56:      * @param   str         the substring for which to search.
jaroslav@56:      * @param   fromIndex   the index from which to start the search.
jaroslav@56:      * @return  the index within this string of the first occurrence of the
jaroslav@56:      *          specified substring, starting at the specified index.
jaroslav@56:      * @throws  java.lang.NullPointerException if <code>str</code> is
jaroslav@56:      *            <code>null</code>.
jaroslav@56:      */
jaroslav@56:     public int indexOf(String str, int fromIndex) {
jaroslav@56:         return String.indexOf(value, 0, count,
jaroslav@56:                               str.toCharArray(), 0, str.length(), fromIndex);
jaroslav@56:     }
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * Returns the index within this string of the rightmost occurrence
jaroslav@56:      * of the specified substring.  The rightmost empty string "" is
jaroslav@56:      * considered to occur at the index value <code>this.length()</code>.
jaroslav@56:      * The returned index is the largest value <i>k</i> such that
jaroslav@56:      * <blockquote><pre>
jaroslav@56:      * this.toString().startsWith(str, k)
jaroslav@56:      * </pre></blockquote>
jaroslav@56:      * is true.
jaroslav@56:      *
jaroslav@56:      * @param   str   the substring to search for.
jaroslav@56:      * @return  if the string argument occurs one or more times as a substring
jaroslav@56:      *          within this object, then the index of the first character of
jaroslav@56:      *          the last such substring is returned. If it does not occur as
jaroslav@56:      *          a substring, <code>-1</code> is returned.
jaroslav@56:      * @throws  java.lang.NullPointerException  if <code>str</code> is
jaroslav@56:      *          <code>null</code>.
jaroslav@56:      */
jaroslav@56:     public int lastIndexOf(String str) {
jaroslav@56:         return lastIndexOf(str, count);
jaroslav@56:     }
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * Returns the index within this string of the last occurrence of the
jaroslav@56:      * specified substring. The integer returned is the largest value <i>k</i>
jaroslav@56:      * such that:
jaroslav@56:      * <blockquote><pre>
jaroslav@56:      *     k <= Math.min(fromIndex, str.length()) &&
jaroslav@56:      *                   this.toString().startsWith(str, k)
jaroslav@56:      * </pre></blockquote>
jaroslav@56:      * If no such value of <i>k</i> exists, then -1 is returned.
jaroslav@56:      *
jaroslav@56:      * @param   str         the substring to search for.
jaroslav@56:      * @param   fromIndex   the index to start the search from.
jaroslav@56:      * @return  the index within this sequence of the last occurrence of the
jaroslav@56:      *          specified substring.
jaroslav@56:      * @throws  java.lang.NullPointerException if <code>str</code> is
jaroslav@56:      *          <code>null</code>.
jaroslav@56:      */
jaroslav@56:     public int lastIndexOf(String str, int fromIndex) {
jaroslav@56:         return String.lastIndexOf(value, 0, count,
jaroslav@56:                               str.toCharArray(), 0, str.length(), fromIndex);
jaroslav@56:     }
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * Causes this character sequence to be replaced by the reverse of
jaroslav@56:      * the sequence. If there are any surrogate pairs included in the
jaroslav@56:      * sequence, these are treated as single characters for the
jaroslav@56:      * reverse operation. Thus, the order of the high-low surrogates
jaroslav@56:      * is never reversed.
jaroslav@56:      *
jaroslav@56:      * Let <i>n</i> be the character length of this character sequence
jaroslav@56:      * (not the length in <code>char</code> values) just prior to
jaroslav@56:      * execution of the <code>reverse</code> method. Then the
jaroslav@56:      * character at index <i>k</i> in the new character sequence is
jaroslav@56:      * equal to the character at index <i>n-k-1</i> in the old
jaroslav@56:      * character sequence.
jaroslav@56:      *
jaroslav@56:      * <p>Note that the reverse operation may result in producing
jaroslav@56:      * surrogate pairs that were unpaired low-surrogates and
jaroslav@56:      * high-surrogates before the operation. For example, reversing
jaroslav@56:      * "&#92;uDC00&#92;uD800" produces "&#92;uD800&#92;uDC00" which is
jaroslav@56:      * a valid surrogate pair.
jaroslav@56:      *
jaroslav@56:      * @return  a reference to this object.
jaroslav@56:      */
jaroslav@56:     public AbstractStringBuilder reverse() {
jaroslav@56:         boolean hasSurrogate = false;
jaroslav@56:         int n = count - 1;
jaroslav@56:         for (int j = (n-1) >> 1; j >= 0; --j) {
jaroslav@56:             char temp = value[j];
jaroslav@56:             char temp2 = value[n - j];
jaroslav@56:             if (!hasSurrogate) {
jaroslav@56:                 hasSurrogate = (temp >= Character.MIN_SURROGATE && temp <= Character.MAX_SURROGATE)
jaroslav@56:                     || (temp2 >= Character.MIN_SURROGATE && temp2 <= Character.MAX_SURROGATE);
jaroslav@56:             }
jaroslav@56:             value[j] = temp2;
jaroslav@56:             value[n - j] = temp;
jaroslav@56:         }
jaroslav@56:         if (hasSurrogate) {
jaroslav@56:             // Reverse back all valid surrogate pairs
jaroslav@56:             for (int i = 0; i < count - 1; i++) {
jaroslav@56:                 char c2 = value[i];
jaroslav@56:                 if (Character.isLowSurrogate(c2)) {
jaroslav@56:                     char c1 = value[i + 1];
jaroslav@56:                     if (Character.isHighSurrogate(c1)) {
jaroslav@56:                         value[i++] = c1;
jaroslav@56:                         value[i] = c2;
jaroslav@56:                     }
jaroslav@56:                 }
jaroslav@56:             }
jaroslav@56:         }
jaroslav@56:         return this;
jaroslav@56:     }
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * Returns a string representing the data in this sequence.
jaroslav@56:      * A new <code>String</code> object is allocated and initialized to
jaroslav@56:      * contain the character sequence currently represented by this
jaroslav@56:      * object. This <code>String</code> is then returned. Subsequent
jaroslav@56:      * changes to this sequence do not affect the contents of the
jaroslav@56:      * <code>String</code>.
jaroslav@56:      *
jaroslav@56:      * @return  a string representation of this sequence of characters.
jaroslav@56:      */
jaroslav@56:     public abstract String toString();
jaroslav@56: 
jaroslav@56:     /**
jaroslav@56:      * Needed by <tt>String</tt> for the contentEquals method.
jaroslav@56:      */
jaroslav@56:     final char[] getValue() {
jaroslav@56:         return value;
jaroslav@56:     }
jaroslav@56: 
jaroslav@104:     static char[] copyOfRange(char[] original, int from, int to) {
jaroslav@104:         int newLength = to - from;
jaroslav@104:         if (newLength < 0) {
jaroslav@104:             throw new IllegalArgumentException(from + " > " + to);
jaroslav@104:         }
jaroslav@104:         char[] copy = new char[newLength];
jaroslav@104:         arraycopy(original, from, copy, 0, Math.min(original.length - from, newLength));
jaroslav@104:         return copy;
jaroslav@104:     }
jaroslav@104: 
jaroslav@104:     static void arraycopy(char[] value, int srcBegin, char[] dst, int dstBegin, int count) {
jaroslav@104:         while (count-- > 0) {
jaroslav@188:             dst[dstBegin + count] = value[srcBegin + count];
jaroslav@104:         }
jaroslav@104:     }
jaroslav@104: 
jaroslav@104:     // access system property
jaroslav@104:     static String getProperty(String nm) {
jaroslav@104:         return null;
jaroslav@104:     }
jaroslav@104: 
jaroslav@104:     static char[] copyOf(char[] original, int newLength) {
jaroslav@104:         char[] copy = new char[newLength];
jaroslav@104:         arraycopy(original, 0, copy, 0, Math.min(original.length, newLength));
jaroslav@104:         return copy;
jaroslav@104:     }
jaroslav@104:     
jaroslav@56: }