author | jboes |
Fri, 20 Sep 2019 11:07:52 +0100 | |
changeset 58242 | 94bb65cb37d3 |
parent 47216 | 71c04702a3d5 |
child 59201 | b24f4caa1411 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1994, 2019, 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.util; |
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import java.lang.*; |
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/** |
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* The string tokenizer class allows an application to break a |
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* string into tokens. The tokenization method is much simpler than |
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* the one used by the {@code StreamTokenizer} class. The |
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* {@code StringTokenizer} methods do not distinguish among |
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* identifiers, numbers, and quoted strings, nor do they recognize |
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* and skip comments. |
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* <p> |
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* The set of delimiters (the characters that separate tokens) may |
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* be specified either at creation time or on a per-token basis. |
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* <p> |
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* An instance of {@code StringTokenizer} behaves in one of two |
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* ways, depending on whether it was created with the |
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* {@code returnDelims} flag having the value {@code true} |
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* or {@code false}: |
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* <ul> |
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* <li>If the flag is {@code false}, delimiter characters serve to |
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* separate tokens. A token is a maximal sequence of consecutive |
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* characters that are not delimiters. |
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* <li>If the flag is {@code true}, delimiter characters are themselves |
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* considered to be tokens. A token is thus either one delimiter |
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* character, or a maximal sequence of consecutive characters that are |
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* not delimiters. |
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* </ul><p> |
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* A {@code StringTokenizer} object internally maintains a current |
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* position within the string to be tokenized. Some operations advance this |
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* current position past the characters processed.<p> |
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* A token is returned by taking a substring of the string that was used to |
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* create the {@code StringTokenizer} object. |
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* <p> |
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* The following is one example of the use of the tokenizer. The code: |
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* <blockquote><pre> |
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* StringTokenizer st = new StringTokenizer("this is a test"); |
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* while (st.hasMoreTokens()) { |
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* System.out.println(st.nextToken()); |
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* } |
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* </pre></blockquote> |
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* <p> |
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* prints the following output: |
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* <blockquote><pre> |
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* this |
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* is |
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* a |
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* test |
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* </pre></blockquote> |
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* |
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* <p> |
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* {@code StringTokenizer} is a legacy class that is retained for |
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* compatibility reasons although its use is discouraged in new code. It is |
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* recommended that anyone seeking this functionality use the {@code split} |
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* method of {@code String} or the java.util.regex package instead. |
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* <p> |
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* The following example illustrates how the {@code String.split} |
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* method can be used to break up a string into its basic tokens: |
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* <blockquote><pre> |
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* String[] result = "this is a test".split("\\s"); |
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* for (int x=0; x<result.length; x++) |
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* System.out.println(result[x]); |
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* </pre></blockquote> |
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* <p> |
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* prints the following output: |
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* <blockquote><pre> |
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* this |
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* is |
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* a |
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* test |
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* </pre></blockquote> |
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* |
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* @author unascribed |
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* @see java.io.StreamTokenizer |
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* @since 1.0 |
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*/ |
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public |
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class StringTokenizer implements Enumeration<Object> { |
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private int currentPosition; |
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private int newPosition; |
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private int maxPosition; |
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private String str; |
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private String delimiters; |
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private boolean retDelims; |
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private boolean delimsChanged; |
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/** |
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* maxDelimCodePoint stores the value of the delimiter character with the |
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* highest value. It is used to optimize the detection of delimiter |
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* characters. |
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* |
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* It is unlikely to provide any optimization benefit in the |
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* hasSurrogates case because most string characters will be |
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* smaller than the limit, but we keep it so that the two code |
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* paths remain similar. |
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*/ |
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private int maxDelimCodePoint; |
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/** |
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* If delimiters include any surrogates (including surrogate |
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* pairs), hasSurrogates is true and the tokenizer uses the |
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* different code path. This is because String.indexOf(int) |
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* doesn't handle unpaired surrogates as a single character. |
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*/ |
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private boolean hasSurrogates = false; |
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/** |
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* When hasSurrogates is true, delimiters are converted to code |
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* points and isDelimiter(int) is used to determine if the given |
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* codepoint is a delimiter. |
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*/ |
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private int[] delimiterCodePoints; |
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/** |
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* Set maxDelimCodePoint to the highest char in the delimiter set. |
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*/ |
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private void setMaxDelimCodePoint() { |
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if (delimiters == null) { |
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maxDelimCodePoint = 0; |
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return; |
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} |
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int m = 0; |
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int c; |
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int count = 0; |
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for (int i = 0; i < delimiters.length(); i += Character.charCount(c)) { |
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c = delimiters.charAt(i); |
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if (c >= Character.MIN_HIGH_SURROGATE && c <= Character.MAX_LOW_SURROGATE) { |
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c = delimiters.codePointAt(i); |
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hasSurrogates = true; |
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} |
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if (m < c) |
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m = c; |
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count++; |
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} |
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maxDelimCodePoint = m; |
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if (hasSurrogates) { |
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delimiterCodePoints = new int[count]; |
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for (int i = 0, j = 0; i < count; i++, j += Character.charCount(c)) { |
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c = delimiters.codePointAt(j); |
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delimiterCodePoints[i] = c; |
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} |
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} |
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} |
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/** |
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* Constructs a string tokenizer for the specified string. All |
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* characters in the {@code delim} argument are the delimiters |
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* for separating tokens. |
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* <p> |
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* If the {@code returnDelims} flag is {@code true}, then |
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* the delimiter characters are also returned as tokens. Each |
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* delimiter is returned as a string of length one. If the flag is |
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* {@code false}, the delimiter characters are skipped and only |
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* serve as separators between tokens. |
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* <p> |
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* Note that if {@code delim} is {@code null}, this constructor does |
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* not throw an exception. However, trying to invoke other methods on the |
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* resulting {@code StringTokenizer} may result in a |
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* {@code NullPointerException}. |
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* |
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* @param str a string to be parsed. |
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* @param delim the delimiters. |
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* @param returnDelims flag indicating whether to return the delimiters |
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* as tokens. |
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* @throws NullPointerException if str is {@code null} |
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*/ |
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public StringTokenizer(String str, String delim, boolean returnDelims) { |
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currentPosition = 0; |
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newPosition = -1; |
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delimsChanged = false; |
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this.str = str; |
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maxPosition = str.length(); |
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delimiters = delim; |
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retDelims = returnDelims; |
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setMaxDelimCodePoint(); |
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} |
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/** |
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* Constructs a string tokenizer for the specified string. The |
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* characters in the {@code delim} argument are the delimiters |
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* for separating tokens. Delimiter characters themselves will not |
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* be treated as tokens. |
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* <p> |
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* Note that if {@code delim} is {@code null}, this constructor does |
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* not throw an exception. However, trying to invoke other methods on the |
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* resulting {@code StringTokenizer} may result in a |
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* {@code NullPointerException}. |
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* |
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* @param str a string to be parsed. |
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* @param delim the delimiters. |
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* @throws NullPointerException if str is {@code null} |
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*/ |
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public StringTokenizer(String str, String delim) { |
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this(str, delim, false); |
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} |
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/** |
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* Constructs a string tokenizer for the specified string. The |
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* tokenizer uses the default delimiter set, which is |
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* <code>" \t\n\r\f"</code>: the space character, |
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* the tab character, the newline character, the carriage-return character, |
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* and the form-feed character. Delimiter characters themselves will |
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* not be treated as tokens. |
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* |
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* @param str a string to be parsed. |
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* @throws NullPointerException if str is {@code null} |
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*/ |
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public StringTokenizer(String str) { |
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this(str, " \t\n\r\f", false); |
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} |
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/** |
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* Skips delimiters starting from the specified position. If retDelims |
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* is false, returns the index of the first non-delimiter character at or |
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* after startPos. If retDelims is true, startPos is returned. |
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*/ |
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private int skipDelimiters(int startPos) { |
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if (delimiters == null) |
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throw new NullPointerException(); |
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int position = startPos; |
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while (!retDelims && position < maxPosition) { |
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if (!hasSurrogates) { |
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char c = str.charAt(position); |
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if ((c > maxDelimCodePoint) || (delimiters.indexOf(c) < 0)) |
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break; |
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position++; |
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} else { |
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int c = str.codePointAt(position); |
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if ((c > maxDelimCodePoint) || !isDelimiter(c)) { |
|
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break; |
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} |
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position += Character.charCount(c); |
|
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} |
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} |
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return position; |
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} |
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||
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/** |
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* Skips ahead from startPos and returns the index of the next delimiter |
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* character encountered, or maxPosition if no such delimiter is found. |
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*/ |
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270 |
private int scanToken(int startPos) { |
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int position = startPos; |
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while (position < maxPosition) { |
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if (!hasSurrogates) { |
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char c = str.charAt(position); |
|
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if ((c <= maxDelimCodePoint) && (delimiters.indexOf(c) >= 0)) |
|
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break; |
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277 |
position++; |
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} else { |
|
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int c = str.codePointAt(position); |
|
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if ((c <= maxDelimCodePoint) && isDelimiter(c)) |
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break; |
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position += Character.charCount(c); |
|
283 |
} |
|
284 |
} |
|
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if (retDelims && (startPos == position)) { |
|
286 |
if (!hasSurrogates) { |
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char c = str.charAt(position); |
|
288 |
if ((c <= maxDelimCodePoint) && (delimiters.indexOf(c) >= 0)) |
|
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position++; |
|
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} else { |
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int c = str.codePointAt(position); |
|
292 |
if ((c <= maxDelimCodePoint) && isDelimiter(c)) |
|
293 |
position += Character.charCount(c); |
|
294 |
} |
|
295 |
} |
|
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return position; |
|
297 |
} |
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299 |
private boolean isDelimiter(int codePoint) { |
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for (int delimiterCodePoint : delimiterCodePoints) { |
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if (delimiterCodePoint == codePoint) { |
2 | 302 |
return true; |
303 |
} |
|
304 |
} |
|
305 |
return false; |
|
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} |
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/** |
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* Tests if there are more tokens available from this tokenizer's string. |
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* If this method returns {@code true}, then a subsequent call to |
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* {@code nextToken} with no argument will successfully return a token. |
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* |
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* @return {@code true} if and only if there is at least one token |
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* in the string after the current position; {@code false} |
2 | 315 |
* otherwise. |
316 |
*/ |
|
317 |
public boolean hasMoreTokens() { |
|
318 |
/* |
|
319 |
* Temporarily store this position and use it in the following |
|
320 |
* nextToken() method only if the delimiters haven't been changed in |
|
321 |
* that nextToken() invocation. |
|
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*/ |
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323 |
newPosition = skipDelimiters(currentPosition); |
|
324 |
return (newPosition < maxPosition); |
|
325 |
} |
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326 |
||
327 |
/** |
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328 |
* Returns the next token from this string tokenizer. |
|
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* |
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* @return the next token from this string tokenizer. |
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* @throws NoSuchElementException if there are no more tokens in this |
2 | 332 |
* tokenizer's string. |
333 |
*/ |
|
334 |
public String nextToken() { |
|
335 |
/* |
|
336 |
* If next position already computed in hasMoreElements() and |
|
337 |
* delimiters have changed between the computation and this invocation, |
|
338 |
* then use the computed value. |
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*/ |
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340 |
||
341 |
currentPosition = (newPosition >= 0 && !delimsChanged) ? |
|
342 |
newPosition : skipDelimiters(currentPosition); |
|
343 |
||
344 |
/* Reset these anyway */ |
|
345 |
delimsChanged = false; |
|
346 |
newPosition = -1; |
|
347 |
||
348 |
if (currentPosition >= maxPosition) |
|
349 |
throw new NoSuchElementException(); |
|
350 |
int start = currentPosition; |
|
351 |
currentPosition = scanToken(currentPosition); |
|
352 |
return str.substring(start, currentPosition); |
|
353 |
} |
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/** |
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* Returns the next token in this string tokenizer's string. First, |
|
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* the set of characters considered to be delimiters by this |
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* {@code StringTokenizer} object is changed to be the characters in |
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* the string {@code delim}. Then the next token in the string |
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* after the current position is returned. The current position is |
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* advanced beyond the recognized token. The new delimiter set |
|
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* remains the default after this call. |
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* |
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* @param delim the new delimiters. |
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* @return the next token, after switching to the new delimiter set. |
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* @throws NoSuchElementException if there are no more tokens in this |
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* tokenizer's string. |
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* @throws NullPointerException if delim is {@code null} |
2 | 369 |
*/ |
370 |
public String nextToken(String delim) { |
|
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delimiters = delim; |
|
372 |
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/* delimiter string specified, so set the appropriate flag. */ |
|
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delimsChanged = true; |
|
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setMaxDelimCodePoint(); |
|
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return nextToken(); |
|
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} |
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/** |
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* Returns the same value as the {@code hasMoreTokens} |
2 | 382 |
* method. It exists so that this class can implement the |
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* {@code Enumeration} interface. |
2 | 384 |
* |
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* @return {@code true} if there are more tokens; |
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* {@code false} otherwise. |
2 | 387 |
* @see java.util.Enumeration |
388 |
* @see java.util.StringTokenizer#hasMoreTokens() |
|
389 |
*/ |
|
390 |
public boolean hasMoreElements() { |
|
391 |
return hasMoreTokens(); |
|
392 |
} |
|
393 |
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394 |
/** |
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* Returns the same value as the {@code nextToken} method, |
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* except that its declared return value is {@code Object} rather than |
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* {@code String}. It exists so that this class can implement the |
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* {@code Enumeration} interface. |
2 | 399 |
* |
400 |
* @return the next token in the string. |
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* @throws NoSuchElementException if there are no more tokens in this |
2 | 402 |
* tokenizer's string. |
403 |
* @see java.util.Enumeration |
|
404 |
* @see java.util.StringTokenizer#nextToken() |
|
405 |
*/ |
|
406 |
public Object nextElement() { |
|
407 |
return nextToken(); |
|
408 |
} |
|
409 |
||
410 |
/** |
|
411 |
* Calculates the number of times that this tokenizer's |
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* {@code nextToken} method can be called before it generates an |
2 | 413 |
* exception. The current position is not advanced. |
414 |
* |
|
415 |
* @return the number of tokens remaining in the string using the current |
|
416 |
* delimiter set. |
|
417 |
* @see java.util.StringTokenizer#nextToken() |
|
418 |
*/ |
|
419 |
public int countTokens() { |
|
420 |
int count = 0; |
|
421 |
int currpos = currentPosition; |
|
422 |
while (currpos < maxPosition) { |
|
423 |
currpos = skipDelimiters(currpos); |
|
424 |
if (currpos >= maxPosition) |
|
425 |
break; |
|
426 |
currpos = scanToken(currpos); |
|
427 |
count++; |
|
428 |
} |
|
429 |
return count; |
|
430 |
} |
|
431 |
} |