1.1 --- a/emul/compact/src/main/java/java/util/StringTokenizer.java Fri Mar 22 16:59:47 2013 +0100
1.2 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000
1.3 @@ -1,431 +0,0 @@
1.4 -/*
1.5 - * Copyright (c) 1994, 2004, Oracle and/or its affiliates. All rights reserved.
1.6 - * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 - *
1.8 - * This code is free software; you can redistribute it and/or modify it
1.9 - * under the terms of the GNU General Public License version 2 only, as
1.10 - * published by the Free Software Foundation. Oracle designates this
1.11 - * particular file as subject to the "Classpath" exception as provided
1.12 - * by Oracle in the LICENSE file that accompanied this code.
1.13 - *
1.14 - * This code is distributed in the hope that it will be useful, but WITHOUT
1.15 - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.16 - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.17 - * version 2 for more details (a copy is included in the LICENSE file that
1.18 - * accompanied this code).
1.19 - *
1.20 - * You should have received a copy of the GNU General Public License version
1.21 - * 2 along with this work; if not, write to the Free Software Foundation,
1.22 - * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.23 - *
1.24 - * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.25 - * or visit www.oracle.com if you need additional information or have any
1.26 - * questions.
1.27 - */
1.28 -
1.29 -package java.util;
1.30 -
1.31 -import java.lang.*;
1.32 -
1.33 -/**
1.34 - * The string tokenizer class allows an application to break a
1.35 - * string into tokens. The tokenization method is much simpler than
1.36 - * the one used by the <code>StreamTokenizer</code> class. The
1.37 - * <code>StringTokenizer</code> methods do not distinguish among
1.38 - * identifiers, numbers, and quoted strings, nor do they recognize
1.39 - * and skip comments.
1.40 - * <p>
1.41 - * The set of delimiters (the characters that separate tokens) may
1.42 - * be specified either at creation time or on a per-token basis.
1.43 - * <p>
1.44 - * An instance of <code>StringTokenizer</code> behaves in one of two
1.45 - * ways, depending on whether it was created with the
1.46 - * <code>returnDelims</code> flag having the value <code>true</code>
1.47 - * or <code>false</code>:
1.48 - * <ul>
1.49 - * <li>If the flag is <code>false</code>, delimiter characters serve to
1.50 - * separate tokens. A token is a maximal sequence of consecutive
1.51 - * characters that are not delimiters.
1.52 - * <li>If the flag is <code>true</code>, delimiter characters are themselves
1.53 - * considered to be tokens. A token is thus either one delimiter
1.54 - * character, or a maximal sequence of consecutive characters that are
1.55 - * not delimiters.
1.56 - * </ul><p>
1.57 - * A <tt>StringTokenizer</tt> object internally maintains a current
1.58 - * position within the string to be tokenized. Some operations advance this
1.59 - * current position past the characters processed.<p>
1.60 - * A token is returned by taking a substring of the string that was used to
1.61 - * create the <tt>StringTokenizer</tt> object.
1.62 - * <p>
1.63 - * The following is one example of the use of the tokenizer. The code:
1.64 - * <blockquote><pre>
1.65 - * StringTokenizer st = new StringTokenizer("this is a test");
1.66 - * while (st.hasMoreTokens()) {
1.67 - * System.out.println(st.nextToken());
1.68 - * }
1.69 - * </pre></blockquote>
1.70 - * <p>
1.71 - * prints the following output:
1.72 - * <blockquote><pre>
1.73 - * this
1.74 - * is
1.75 - * a
1.76 - * test
1.77 - * </pre></blockquote>
1.78 - *
1.79 - * <p>
1.80 - * <tt>StringTokenizer</tt> is a legacy class that is retained for
1.81 - * compatibility reasons although its use is discouraged in new code. It is
1.82 - * recommended that anyone seeking this functionality use the <tt>split</tt>
1.83 - * method of <tt>String</tt> or the java.util.regex package instead.
1.84 - * <p>
1.85 - * The following example illustrates how the <tt>String.split</tt>
1.86 - * method can be used to break up a string into its basic tokens:
1.87 - * <blockquote><pre>
1.88 - * String[] result = "this is a test".split("\\s");
1.89 - * for (int x=0; x<result.length; x++)
1.90 - * System.out.println(result[x]);
1.91 - * </pre></blockquote>
1.92 - * <p>
1.93 - * prints the following output:
1.94 - * <blockquote><pre>
1.95 - * this
1.96 - * is
1.97 - * a
1.98 - * test
1.99 - * </pre></blockquote>
1.100 - *
1.101 - * @author unascribed
1.102 - * @see java.io.StreamTokenizer
1.103 - * @since JDK1.0
1.104 - */
1.105 -public
1.106 -class StringTokenizer implements Enumeration<Object> {
1.107 - private int currentPosition;
1.108 - private int newPosition;
1.109 - private int maxPosition;
1.110 - private String str;
1.111 - private String delimiters;
1.112 - private boolean retDelims;
1.113 - private boolean delimsChanged;
1.114 -
1.115 - /**
1.116 - * maxDelimCodePoint stores the value of the delimiter character with the
1.117 - * highest value. It is used to optimize the detection of delimiter
1.118 - * characters.
1.119 - *
1.120 - * It is unlikely to provide any optimization benefit in the
1.121 - * hasSurrogates case because most string characters will be
1.122 - * smaller than the limit, but we keep it so that the two code
1.123 - * paths remain similar.
1.124 - */
1.125 - private int maxDelimCodePoint;
1.126 -
1.127 - /**
1.128 - * If delimiters include any surrogates (including surrogate
1.129 - * pairs), hasSurrogates is true and the tokenizer uses the
1.130 - * different code path. This is because String.indexOf(int)
1.131 - * doesn't handle unpaired surrogates as a single character.
1.132 - */
1.133 - private boolean hasSurrogates = false;
1.134 -
1.135 - /**
1.136 - * When hasSurrogates is true, delimiters are converted to code
1.137 - * points and isDelimiter(int) is used to determine if the given
1.138 - * codepoint is a delimiter.
1.139 - */
1.140 - private int[] delimiterCodePoints;
1.141 -
1.142 - /**
1.143 - * Set maxDelimCodePoint to the highest char in the delimiter set.
1.144 - */
1.145 - private void setMaxDelimCodePoint() {
1.146 - if (delimiters == null) {
1.147 - maxDelimCodePoint = 0;
1.148 - return;
1.149 - }
1.150 -
1.151 - int m = 0;
1.152 - int c;
1.153 - int count = 0;
1.154 - for (int i = 0; i < delimiters.length(); i += Character.charCount(c)) {
1.155 - c = delimiters.charAt(i);
1.156 - if (c >= Character.MIN_HIGH_SURROGATE && c <= Character.MAX_LOW_SURROGATE) {
1.157 - c = delimiters.codePointAt(i);
1.158 - hasSurrogates = true;
1.159 - }
1.160 - if (m < c)
1.161 - m = c;
1.162 - count++;
1.163 - }
1.164 - maxDelimCodePoint = m;
1.165 -
1.166 - if (hasSurrogates) {
1.167 - delimiterCodePoints = new int[count];
1.168 - for (int i = 0, j = 0; i < count; i++, j += Character.charCount(c)) {
1.169 - c = delimiters.codePointAt(j);
1.170 - delimiterCodePoints[i] = c;
1.171 - }
1.172 - }
1.173 - }
1.174 -
1.175 - /**
1.176 - * Constructs a string tokenizer for the specified string. All
1.177 - * characters in the <code>delim</code> argument are the delimiters
1.178 - * for separating tokens.
1.179 - * <p>
1.180 - * If the <code>returnDelims</code> flag is <code>true</code>, then
1.181 - * the delimiter characters are also returned as tokens. Each
1.182 - * delimiter is returned as a string of length one. If the flag is
1.183 - * <code>false</code>, the delimiter characters are skipped and only
1.184 - * serve as separators between tokens.
1.185 - * <p>
1.186 - * Note that if <tt>delim</tt> is <tt>null</tt>, this constructor does
1.187 - * not throw an exception. However, trying to invoke other methods on the
1.188 - * resulting <tt>StringTokenizer</tt> may result in a
1.189 - * <tt>NullPointerException</tt>.
1.190 - *
1.191 - * @param str a string to be parsed.
1.192 - * @param delim the delimiters.
1.193 - * @param returnDelims flag indicating whether to return the delimiters
1.194 - * as tokens.
1.195 - * @exception NullPointerException if str is <CODE>null</CODE>
1.196 - */
1.197 - public StringTokenizer(String str, String delim, boolean returnDelims) {
1.198 - currentPosition = 0;
1.199 - newPosition = -1;
1.200 - delimsChanged = false;
1.201 - this.str = str;
1.202 - maxPosition = str.length();
1.203 - delimiters = delim;
1.204 - retDelims = returnDelims;
1.205 - setMaxDelimCodePoint();
1.206 - }
1.207 -
1.208 - /**
1.209 - * Constructs a string tokenizer for the specified string. The
1.210 - * characters in the <code>delim</code> argument are the delimiters
1.211 - * for separating tokens. Delimiter characters themselves will not
1.212 - * be treated as tokens.
1.213 - * <p>
1.214 - * Note that if <tt>delim</tt> is <tt>null</tt>, this constructor does
1.215 - * not throw an exception. However, trying to invoke other methods on the
1.216 - * resulting <tt>StringTokenizer</tt> may result in a
1.217 - * <tt>NullPointerException</tt>.
1.218 - *
1.219 - * @param str a string to be parsed.
1.220 - * @param delim the delimiters.
1.221 - * @exception NullPointerException if str is <CODE>null</CODE>
1.222 - */
1.223 - public StringTokenizer(String str, String delim) {
1.224 - this(str, delim, false);
1.225 - }
1.226 -
1.227 - /**
1.228 - * Constructs a string tokenizer for the specified string. The
1.229 - * tokenizer uses the default delimiter set, which is
1.230 - * <code>" \t\n\r\f"</code>: the space character,
1.231 - * the tab character, the newline character, the carriage-return character,
1.232 - * and the form-feed character. Delimiter characters themselves will
1.233 - * not be treated as tokens.
1.234 - *
1.235 - * @param str a string to be parsed.
1.236 - * @exception NullPointerException if str is <CODE>null</CODE>
1.237 - */
1.238 - public StringTokenizer(String str) {
1.239 - this(str, " \t\n\r\f", false);
1.240 - }
1.241 -
1.242 - /**
1.243 - * Skips delimiters starting from the specified position. If retDelims
1.244 - * is false, returns the index of the first non-delimiter character at or
1.245 - * after startPos. If retDelims is true, startPos is returned.
1.246 - */
1.247 - private int skipDelimiters(int startPos) {
1.248 - if (delimiters == null)
1.249 - throw new NullPointerException();
1.250 -
1.251 - int position = startPos;
1.252 - while (!retDelims && position < maxPosition) {
1.253 - if (!hasSurrogates) {
1.254 - char c = str.charAt(position);
1.255 - if ((c > maxDelimCodePoint) || (delimiters.indexOf(c) < 0))
1.256 - break;
1.257 - position++;
1.258 - } else {
1.259 - int c = str.codePointAt(position);
1.260 - if ((c > maxDelimCodePoint) || !isDelimiter(c)) {
1.261 - break;
1.262 - }
1.263 - position += Character.charCount(c);
1.264 - }
1.265 - }
1.266 - return position;
1.267 - }
1.268 -
1.269 - /**
1.270 - * Skips ahead from startPos and returns the index of the next delimiter
1.271 - * character encountered, or maxPosition if no such delimiter is found.
1.272 - */
1.273 - private int scanToken(int startPos) {
1.274 - int position = startPos;
1.275 - while (position < maxPosition) {
1.276 - if (!hasSurrogates) {
1.277 - char c = str.charAt(position);
1.278 - if ((c <= maxDelimCodePoint) && (delimiters.indexOf(c) >= 0))
1.279 - break;
1.280 - position++;
1.281 - } else {
1.282 - int c = str.codePointAt(position);
1.283 - if ((c <= maxDelimCodePoint) && isDelimiter(c))
1.284 - break;
1.285 - position += Character.charCount(c);
1.286 - }
1.287 - }
1.288 - if (retDelims && (startPos == position)) {
1.289 - if (!hasSurrogates) {
1.290 - char c = str.charAt(position);
1.291 - if ((c <= maxDelimCodePoint) && (delimiters.indexOf(c) >= 0))
1.292 - position++;
1.293 - } else {
1.294 - int c = str.codePointAt(position);
1.295 - if ((c <= maxDelimCodePoint) && isDelimiter(c))
1.296 - position += Character.charCount(c);
1.297 - }
1.298 - }
1.299 - return position;
1.300 - }
1.301 -
1.302 - private boolean isDelimiter(int codePoint) {
1.303 - for (int i = 0; i < delimiterCodePoints.length; i++) {
1.304 - if (delimiterCodePoints[i] == codePoint) {
1.305 - return true;
1.306 - }
1.307 - }
1.308 - return false;
1.309 - }
1.310 -
1.311 - /**
1.312 - * Tests if there are more tokens available from this tokenizer's string.
1.313 - * If this method returns <tt>true</tt>, then a subsequent call to
1.314 - * <tt>nextToken</tt> with no argument will successfully return a token.
1.315 - *
1.316 - * @return <code>true</code> if and only if there is at least one token
1.317 - * in the string after the current position; <code>false</code>
1.318 - * otherwise.
1.319 - */
1.320 - public boolean hasMoreTokens() {
1.321 - /*
1.322 - * Temporarily store this position and use it in the following
1.323 - * nextToken() method only if the delimiters haven't been changed in
1.324 - * that nextToken() invocation.
1.325 - */
1.326 - newPosition = skipDelimiters(currentPosition);
1.327 - return (newPosition < maxPosition);
1.328 - }
1.329 -
1.330 - /**
1.331 - * Returns the next token from this string tokenizer.
1.332 - *
1.333 - * @return the next token from this string tokenizer.
1.334 - * @exception NoSuchElementException if there are no more tokens in this
1.335 - * tokenizer's string.
1.336 - */
1.337 - public String nextToken() {
1.338 - /*
1.339 - * If next position already computed in hasMoreElements() and
1.340 - * delimiters have changed between the computation and this invocation,
1.341 - * then use the computed value.
1.342 - */
1.343 -
1.344 - currentPosition = (newPosition >= 0 && !delimsChanged) ?
1.345 - newPosition : skipDelimiters(currentPosition);
1.346 -
1.347 - /* Reset these anyway */
1.348 - delimsChanged = false;
1.349 - newPosition = -1;
1.350 -
1.351 - if (currentPosition >= maxPosition)
1.352 - throw new NoSuchElementException();
1.353 - int start = currentPosition;
1.354 - currentPosition = scanToken(currentPosition);
1.355 - return str.substring(start, currentPosition);
1.356 - }
1.357 -
1.358 - /**
1.359 - * Returns the next token in this string tokenizer's string. First,
1.360 - * the set of characters considered to be delimiters by this
1.361 - * <tt>StringTokenizer</tt> object is changed to be the characters in
1.362 - * the string <tt>delim</tt>. Then the next token in the string
1.363 - * after the current position is returned. The current position is
1.364 - * advanced beyond the recognized token. The new delimiter set
1.365 - * remains the default after this call.
1.366 - *
1.367 - * @param delim the new delimiters.
1.368 - * @return the next token, after switching to the new delimiter set.
1.369 - * @exception NoSuchElementException if there are no more tokens in this
1.370 - * tokenizer's string.
1.371 - * @exception NullPointerException if delim is <CODE>null</CODE>
1.372 - */
1.373 - public String nextToken(String delim) {
1.374 - delimiters = delim;
1.375 -
1.376 - /* delimiter string specified, so set the appropriate flag. */
1.377 - delimsChanged = true;
1.378 -
1.379 - setMaxDelimCodePoint();
1.380 - return nextToken();
1.381 - }
1.382 -
1.383 - /**
1.384 - * Returns the same value as the <code>hasMoreTokens</code>
1.385 - * method. It exists so that this class can implement the
1.386 - * <code>Enumeration</code> interface.
1.387 - *
1.388 - * @return <code>true</code> if there are more tokens;
1.389 - * <code>false</code> otherwise.
1.390 - * @see java.util.Enumeration
1.391 - * @see java.util.StringTokenizer#hasMoreTokens()
1.392 - */
1.393 - public boolean hasMoreElements() {
1.394 - return hasMoreTokens();
1.395 - }
1.396 -
1.397 - /**
1.398 - * Returns the same value as the <code>nextToken</code> method,
1.399 - * except that its declared return value is <code>Object</code> rather than
1.400 - * <code>String</code>. It exists so that this class can implement the
1.401 - * <code>Enumeration</code> interface.
1.402 - *
1.403 - * @return the next token in the string.
1.404 - * @exception NoSuchElementException if there are no more tokens in this
1.405 - * tokenizer's string.
1.406 - * @see java.util.Enumeration
1.407 - * @see java.util.StringTokenizer#nextToken()
1.408 - */
1.409 - public Object nextElement() {
1.410 - return nextToken();
1.411 - }
1.412 -
1.413 - /**
1.414 - * Calculates the number of times that this tokenizer's
1.415 - * <code>nextToken</code> method can be called before it generates an
1.416 - * exception. The current position is not advanced.
1.417 - *
1.418 - * @return the number of tokens remaining in the string using the current
1.419 - * delimiter set.
1.420 - * @see java.util.StringTokenizer#nextToken()
1.421 - */
1.422 - public int countTokens() {
1.423 - int count = 0;
1.424 - int currpos = currentPosition;
1.425 - while (currpos < maxPosition) {
1.426 - currpos = skipDelimiters(currpos);
1.427 - if (currpos >= maxPosition)
1.428 - break;
1.429 - currpos = scanToken(currpos);
1.430 - count++;
1.431 - }
1.432 - return count;
1.433 - }
1.434 -}