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/*
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* Copyright (c) 2003, 2008, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package java.lang;
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/**
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* A mutable sequence of characters. This class provides an API compatible
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* with <code>StringBuffer</code>, but with no guarantee of synchronization.
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* This class is designed for use as a drop-in replacement for
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* <code>StringBuffer</code> in places where the string buffer was being
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* used by a single thread (as is generally the case). Where possible,
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* it is recommended that this class be used in preference to
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* <code>StringBuffer</code> as it will be faster under most implementations.
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*
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* <p>The principal operations on a <code>StringBuilder</code> are the
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* <code>append</code> and <code>insert</code> methods, which are
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* overloaded so as to accept data of any type. Each effectively
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* converts a given datum to a string and then appends or inserts the
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* characters of that string to the string builder. The
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* <code>append</code> method always adds these characters at the end
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* of the builder; the <code>insert</code> method adds the characters at
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* a specified point.
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* <p>
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* For example, if <code>z</code> refers to a string builder object
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* whose current contents are "<code>start</code>", then
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* the method call <code>z.append("le")</code> would cause the string
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* builder to contain "<code>startle</code>", whereas
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* <code>z.insert(4, "le")</code> would alter the string builder to
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* contain "<code>starlet</code>".
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* <p>
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* In general, if sb refers to an instance of a <code>StringBuilder</code>,
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* then <code>sb.append(x)</code> has the same effect as
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* <code>sb.insert(sb.length(), x)</code>.
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*
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* Every string builder has a capacity. As long as the length of the
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* character sequence contained in the string builder does not exceed
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* the capacity, it is not necessary to allocate a new internal
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* buffer. If the internal buffer overflows, it is automatically made larger.
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*
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* <p>Instances of <code>StringBuilder</code> are not safe for
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* use by multiple threads. If such synchronization is required then it is
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* recommended that {@link java.lang.StringBuffer} be used.
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*
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* @author Michael McCloskey
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* @see java.lang.StringBuffer
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* @see java.lang.String
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* @since 1.5
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*/
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public final class StringBuilder
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extends AbstractStringBuilder
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implements java.io.Serializable, CharSequence
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{
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/** use serialVersionUID for interoperability */
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static final long serialVersionUID = 4383685877147921099L;
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/**
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* Constructs a string builder with no characters in it and an
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* initial capacity of 16 characters.
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*/
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public StringBuilder() {
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super(16);
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}
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/**
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* Constructs a string builder with no characters in it and an
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* initial capacity specified by the <code>capacity</code> argument.
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*
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* @param capacity the initial capacity.
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* @throws NegativeArraySizeException if the <code>capacity</code>
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* argument is less than <code>0</code>.
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*/
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public StringBuilder(int capacity) {
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super(capacity);
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}
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/**
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* Constructs a string builder initialized to the contents of the
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* specified string. The initial capacity of the string builder is
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* <code>16</code> plus the length of the string argument.
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*
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* @param str the initial contents of the buffer.
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* @throws NullPointerException if <code>str</code> is <code>null</code>
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*/
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public StringBuilder(String str) {
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super(str.length() + 16);
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append(str);
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}
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/**
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* Constructs a string builder that contains the same characters
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* as the specified <code>CharSequence</code>. The initial capacity of
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* the string builder is <code>16</code> plus the length of the
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* <code>CharSequence</code> argument.
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*
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* @param seq the sequence to copy.
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* @throws NullPointerException if <code>seq</code> is <code>null</code>
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*/
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public StringBuilder(CharSequence seq) {
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this(seq.length() + 16);
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append(seq);
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}
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public StringBuilder append(Object obj) {
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return append(String.valueOf(obj));
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}
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public StringBuilder append(String str) {
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super.append(str);
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return this;
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}
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// Appends the specified string builder to this sequence.
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private StringBuilder append(StringBuilder sb) {
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if (sb == null)
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return append("null");
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int len = sb.length();
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int newcount = count + len;
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if (newcount > value.length)
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expandCapacity(newcount);
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sb.getChars(0, len, value, count);
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count = newcount;
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return this;
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}
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/**
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* Appends the specified <tt>StringBuffer</tt> to this sequence.
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* <p>
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* The characters of the <tt>StringBuffer</tt> argument are appended,
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* in order, to this sequence, increasing the
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* length of this sequence by the length of the argument.
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* If <tt>sb</tt> is <tt>null</tt>, then the four characters
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* <tt>"null"</tt> are appended to this sequence.
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* <p>
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* Let <i>n</i> be the length of this character sequence just prior to
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* execution of the <tt>append</tt> method. Then the character at index
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* <i>k</i> in the new character sequence is equal to the character at
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* index <i>k</i> in the old character sequence, if <i>k</i> is less than
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* <i>n</i>; otherwise, it is equal to the character at index <i>k-n</i>
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* in the argument <code>sb</code>.
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*
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* @param sb the <tt>StringBuffer</tt> to append.
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* @return a reference to this object.
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*/
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public StringBuilder append(StringBuffer sb) {
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super.append(sb);
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return this;
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}
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/**
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*/
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public StringBuilder append(CharSequence s) {
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if (s == null)
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s = "null";
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if (s instanceof String)
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return this.append((String)s);
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if (s instanceof StringBuffer)
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return this.append((StringBuffer)s);
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if (s instanceof StringBuilder)
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return this.append((StringBuilder)s);
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return this.append(s, 0, s.length());
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}
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/**
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* @throws IndexOutOfBoundsException {@inheritDoc}
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*/
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public StringBuilder append(CharSequence s, int start, int end) {
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super.append(s, start, end);
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return this;
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}
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public StringBuilder append(char[] str) {
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super.append(str);
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return this;
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}
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/**
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* @throws IndexOutOfBoundsException {@inheritDoc}
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*/
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public StringBuilder append(char[] str, int offset, int len) {
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super.append(str, offset, len);
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return this;
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}
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public StringBuilder append(boolean b) {
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super.append(b);
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return this;
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}
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public StringBuilder append(char c) {
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super.append(c);
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return this;
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}
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public StringBuilder append(int i) {
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super.append(i);
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return this;
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}
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public StringBuilder append(long lng) {
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super.append(lng);
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return this;
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}
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public StringBuilder append(float f) {
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super.append(f);
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return this;
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}
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public StringBuilder append(double d) {
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super.append(d);
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return this;
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}
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/**
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* @since 1.5
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*/
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public StringBuilder appendCodePoint(int codePoint) {
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super.appendCodePoint(codePoint);
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return this;
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}
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/**
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* @throws StringIndexOutOfBoundsException {@inheritDoc}
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*/
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public StringBuilder delete(int start, int end) {
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super.delete(start, end);
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return this;
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}
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/**
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* @throws StringIndexOutOfBoundsException {@inheritDoc}
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*/
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public StringBuilder deleteCharAt(int index) {
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super.deleteCharAt(index);
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return this;
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}
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/**
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* @throws StringIndexOutOfBoundsException {@inheritDoc}
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*/
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public StringBuilder replace(int start, int end, String str) {
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super.replace(start, end, str);
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return this;
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}
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/**
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* @throws StringIndexOutOfBoundsException {@inheritDoc}
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*/
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public StringBuilder insert(int index, char[] str, int offset,
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int len)
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{
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super.insert(index, str, offset, len);
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return this;
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}
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/**
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* @throws StringIndexOutOfBoundsException {@inheritDoc}
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*/
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public StringBuilder insert(int offset, Object obj) {
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return insert(offset, String.valueOf(obj));
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}
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/**
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* @throws StringIndexOutOfBoundsException {@inheritDoc}
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*/
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public StringBuilder insert(int offset, String str) {
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super.insert(offset, str);
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return this;
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}
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/**
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* @throws StringIndexOutOfBoundsException {@inheritDoc}
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*/
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public StringBuilder insert(int offset, char[] str) {
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super.insert(offset, str);
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return this;
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}
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/**
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* @throws IndexOutOfBoundsException {@inheritDoc}
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*/
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public StringBuilder insert(int dstOffset, CharSequence s) {
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if (s == null)
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s = "null";
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if (s instanceof String)
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return this.insert(dstOffset, (String)s);
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return this.insert(dstOffset, s, 0, s.length());
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}
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/**
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* @throws IndexOutOfBoundsException {@inheritDoc}
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*/
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public StringBuilder insert(int dstOffset, CharSequence s,
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int start, int end)
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{
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super.insert(dstOffset, s, start, end);
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return this;
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}
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/**
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* @throws StringIndexOutOfBoundsException {@inheritDoc}
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*/
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public StringBuilder insert(int offset, boolean b) {
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super.insert(offset, b);
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return this;
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330 |
}
|
jaroslav@52
|
331 |
|
jaroslav@52
|
332 |
/**
|
jaroslav@52
|
333 |
* @throws IndexOutOfBoundsException {@inheritDoc}
|
jaroslav@52
|
334 |
*/
|
jaroslav@52
|
335 |
public StringBuilder insert(int offset, char c) {
|
jaroslav@52
|
336 |
super.insert(offset, c);
|
jaroslav@52
|
337 |
return this;
|
jaroslav@52
|
338 |
}
|
jaroslav@52
|
339 |
|
jaroslav@52
|
340 |
/**
|
jaroslav@52
|
341 |
* @throws StringIndexOutOfBoundsException {@inheritDoc}
|
jaroslav@52
|
342 |
*/
|
jaroslav@52
|
343 |
public StringBuilder insert(int offset, int i) {
|
jaroslav@52
|
344 |
return insert(offset, String.valueOf(i));
|
jaroslav@52
|
345 |
}
|
jaroslav@52
|
346 |
|
jaroslav@52
|
347 |
/**
|
jaroslav@52
|
348 |
* @throws StringIndexOutOfBoundsException {@inheritDoc}
|
jaroslav@52
|
349 |
*/
|
jaroslav@52
|
350 |
public StringBuilder insert(int offset, long l) {
|
jaroslav@52
|
351 |
return insert(offset, String.valueOf(l));
|
jaroslav@52
|
352 |
}
|
jaroslav@52
|
353 |
|
jaroslav@52
|
354 |
/**
|
jaroslav@52
|
355 |
* @throws StringIndexOutOfBoundsException {@inheritDoc}
|
jaroslav@52
|
356 |
*/
|
jaroslav@52
|
357 |
public StringBuilder insert(int offset, float f) {
|
jaroslav@52
|
358 |
return insert(offset, String.valueOf(f));
|
jaroslav@52
|
359 |
}
|
jaroslav@52
|
360 |
|
jaroslav@52
|
361 |
/**
|
jaroslav@52
|
362 |
* @throws StringIndexOutOfBoundsException {@inheritDoc}
|
jaroslav@52
|
363 |
*/
|
jaroslav@52
|
364 |
public StringBuilder insert(int offset, double d) {
|
jaroslav@52
|
365 |
return insert(offset, String.valueOf(d));
|
jaroslav@52
|
366 |
}
|
jaroslav@52
|
367 |
|
jaroslav@52
|
368 |
/**
|
jaroslav@52
|
369 |
* @throws NullPointerException {@inheritDoc}
|
jaroslav@52
|
370 |
*/
|
jaroslav@52
|
371 |
public int indexOf(String str) {
|
jaroslav@52
|
372 |
return indexOf(str, 0);
|
jaroslav@52
|
373 |
}
|
jaroslav@52
|
374 |
|
jaroslav@52
|
375 |
/**
|
jaroslav@52
|
376 |
* @throws NullPointerException {@inheritDoc}
|
jaroslav@52
|
377 |
*/
|
jaroslav@52
|
378 |
public int indexOf(String str, int fromIndex) {
|
jaroslav@403
|
379 |
return super.indexOf(str, fromIndex);
|
jaroslav@52
|
380 |
}
|
jaroslav@52
|
381 |
|
jaroslav@52
|
382 |
/**
|
jaroslav@52
|
383 |
* @throws NullPointerException {@inheritDoc}
|
jaroslav@52
|
384 |
*/
|
jaroslav@52
|
385 |
public int lastIndexOf(String str) {
|
jaroslav@52
|
386 |
return lastIndexOf(str, count);
|
jaroslav@52
|
387 |
}
|
jaroslav@52
|
388 |
|
jaroslav@52
|
389 |
/**
|
jaroslav@52
|
390 |
* @throws NullPointerException {@inheritDoc}
|
jaroslav@52
|
391 |
*/
|
jaroslav@52
|
392 |
public int lastIndexOf(String str, int fromIndex) {
|
jaroslav@52
|
393 |
return String.lastIndexOf(value, 0, count,
|
jaroslav@52
|
394 |
str.toCharArray(), 0, str.length(), fromIndex);
|
jaroslav@52
|
395 |
}
|
jaroslav@52
|
396 |
|
jaroslav@52
|
397 |
public StringBuilder reverse() {
|
jaroslav@52
|
398 |
super.reverse();
|
jaroslav@52
|
399 |
return this;
|
jaroslav@52
|
400 |
}
|
jaroslav@52
|
401 |
|
jaroslav@52
|
402 |
public String toString() {
|
jaroslav@52
|
403 |
// Create a copy, don't share the array
|
jaroslav@1726
|
404 |
return new String(value, 0, count).toString();
|
jaroslav@52
|
405 |
}
|
jaroslav@52
|
406 |
|
jaroslav@52
|
407 |
/**
|
jaroslav@52
|
408 |
* Save the state of the <tt>StringBuilder</tt> instance to a stream
|
jaroslav@52
|
409 |
* (that is, serialize it).
|
jaroslav@52
|
410 |
*
|
jaroslav@52
|
411 |
* @serialData the number of characters currently stored in the string
|
jaroslav@52
|
412 |
* builder (<tt>int</tt>), followed by the characters in the
|
jaroslav@52
|
413 |
* string builder (<tt>char[]</tt>). The length of the
|
jaroslav@52
|
414 |
* <tt>char</tt> array may be greater than the number of
|
jaroslav@52
|
415 |
* characters currently stored in the string builder, in which
|
jaroslav@52
|
416 |
* case extra characters are ignored.
|
jaroslav@52
|
417 |
*/
|
jaroslav@79
|
418 |
// private void writeObject(java.io.ObjectOutputStream s)
|
jaroslav@79
|
419 |
// throws java.io.IOException {
|
jaroslav@79
|
420 |
// s.defaultWriteObject();
|
jaroslav@79
|
421 |
// s.writeInt(count);
|
jaroslav@79
|
422 |
// s.writeObject(value);
|
jaroslav@79
|
423 |
// }
|
jaroslav@52
|
424 |
|
jaroslav@52
|
425 |
/**
|
jaroslav@52
|
426 |
* readObject is called to restore the state of the StringBuffer from
|
jaroslav@52
|
427 |
* a stream.
|
jaroslav@52
|
428 |
*/
|
jaroslav@79
|
429 |
// private void readObject(java.io.ObjectInputStream s)
|
jaroslav@79
|
430 |
// throws java.io.IOException, ClassNotFoundException {
|
jaroslav@79
|
431 |
// s.defaultReadObject();
|
jaroslav@79
|
432 |
// count = s.readInt();
|
jaroslav@79
|
433 |
// value = (char[]) s.readObject();
|
jaroslav@79
|
434 |
// }
|
jaroslav@52
|
435 |
|
jaroslav@52
|
436 |
}
|