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My first initial commit with all of mine experimental changes.

Dmitry Kabak (userdima committed 13 years ago

Commit d37b88d1 parent 3f5b46618352 files · +2598093 −-8690Browse files

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java/pkg/sun/text/normalizer/UCharacterIterator.java+292−0
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1+/*
2+ * Copyright (c) 2003, 2006, Oracle and/or its affiliates. All rights reserved.
3+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4+ *
5+ * This code is free software; you can redistribute it and/or modify it
6+ * under the terms of the GNU General Public License version 2 only, as
7+ * published by the Free Software Foundation. Oracle designates this
8+ * particular file as subject to the "Classpath" exception as provided
9+ * by Oracle in the LICENSE file that accompanied this code.
10+ *
11+ * This code is distributed in the hope that it will be useful, but WITHOUT
12+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14+ * version 2 for more details (a copy is included in the LICENSE file that
15+ * accompanied this code).
16+ *
17+ * You should have received a copy of the GNU General Public License version
18+ * 2 along with this work; if not, write to the Free Software Foundation,
19+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20+ *
21+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22+ * or visit www.oracle.com if you need additional information or have any
23+ * questions.
24+ */
25+
26+/*
27+ *******************************************************************************
28+ * (C) Copyright IBM Corp. 1996-2005 - All Rights Reserved *
29+ * *
30+ * The original version of this source code and documentation is copyrighted *
31+ * and owned by IBM, These materials are provided under terms of a License *
32+ * Agreement between IBM and Sun. This technology is protected by multiple *
33+ * US and International patents. This notice and attribution to IBM may not *
34+ * to removed. *
35+ *******************************************************************************
36+ */
37+
38+package sun.text.normalizer;
39+
40+import java.text.CharacterIterator;
41+
42+/**
43+ * Abstract class that defines an API for iteration on text objects.This is an
44+ * interface for forward and backward iteration and random access into a text
45+ * object. Forward iteration is done with post-increment and backward iteration
46+ * is done with pre-decrement semantics, while the
47+ * <code>java.text.CharacterIterator</code> interface methods provided forward
48+ * iteration with "pre-increment" and backward iteration with pre-decrement
49+ * semantics. This API is more efficient for forward iteration over code points.
50+ * The other major difference is that this API can do both code unit and code point
51+ * iteration, <code>java.text.CharacterIterator</code> can only iterate over
52+ * code units and is limited to BMP (0 - 0xFFFF)
53+ * @author Ram
54+ * @stable ICU 2.4
55+ */
56+public abstract class UCharacterIterator
57+ implements Cloneable {
58+
59+ /**
60+ * Protected default constructor for the subclasses
61+ * @stable ICU 2.4
62+ */
63+ protected UCharacterIterator(){
64+ }
65+
66+ /**
67+ * Indicator that we have reached the ends of the UTF16 text.
68+ * Moved from UForwardCharacterIterator.java
69+ * @stable ICU 2.4
70+ */
71+ public static final int DONE = -1;
72+
73+ // static final methods ----------------------------------------------------
74+
75+ /**
76+ * Returns a <code>UCharacterIterator</code> object given a
77+ * source string.
78+ * @param source a string
79+ * @return UCharacterIterator object
80+ * @exception IllegalArgumentException if the argument is null
81+ * @stable ICU 2.4
82+ */
83+ public static final UCharacterIterator getInstance(String source){
84+ return new ReplaceableUCharacterIterator(source);
85+ }
86+
87+ //// for StringPrep
88+ /**
89+ * Returns a <code>UCharacterIterator</code> object given a
90+ * source StringBuffer.
91+ * @param source an string buffer of UTF-16 code units
92+ * @return UCharacterIterator object
93+ * @exception IllegalArgumentException if the argument is null
94+ * @stable ICU 2.4
95+ */
96+ public static final UCharacterIterator getInstance(StringBuffer source){
97+ return new ReplaceableUCharacterIterator(source);
98+ }
99+
100+ /**
101+ * Returns a <code>UCharacterIterator</code> object given a
102+ * CharacterIterator.
103+ * @param source a valid CharacterIterator object.
104+ * @return UCharacterIterator object
105+ * @exception IllegalArgumentException if the argument is null
106+ * @stable ICU 2.4
107+ */
108+ public static final UCharacterIterator getInstance(CharacterIterator source){
109+ return new CharacterIteratorWrapper(source);
110+ }
111+
112+ // public methods ----------------------------------------------------------
113+
114+ /**
115+ * Returns the code unit at the current index. If index is out
116+ * of range, returns DONE. Index is not changed.
117+ * @return current code unit
118+ * @stable ICU 2.4
119+ */
120+ public abstract int current();
121+
122+ /**
123+ * Returns the length of the text
124+ * @return length of the text
125+ * @stable ICU 2.4
126+ */
127+ public abstract int getLength();
128+
129+
130+ /**
131+ * Gets the current index in text.
132+ * @return current index in text.
133+ * @stable ICU 2.4
134+ */
135+ public abstract int getIndex();
136+
137+
138+ /**
139+ * Returns the UTF16 code unit at index, and increments to the next
140+ * code unit (post-increment semantics). If index is out of
141+ * range, DONE is returned, and the iterator is reset to the limit
142+ * of the text.
143+ * @return the next UTF16 code unit, or DONE if the index is at the limit
144+ * of the text.
145+ * @stable ICU 2.4
146+ */
147+ public abstract int next();
148+
149+ /**
150+ * Returns the code point at index, and increments to the next code
151+ * point (post-increment semantics). If index does not point to a
152+ * valid surrogate pair, the behavior is the same as
153+ * <code>next()</code>. Otherwise the iterator is incremented past
154+ * the surrogate pair, and the code point represented by the pair
155+ * is returned.
156+ * @return the next codepoint in text, or DONE if the index is at
157+ * the limit of the text.
158+ * @stable ICU 2.4
159+ */
160+ public int nextCodePoint(){
161+ int ch1 = next();
162+ if(UTF16.isLeadSurrogate((char)ch1)){
163+ int ch2 = next();
164+ if(UTF16.isTrailSurrogate((char)ch2)){
165+ return UCharacterProperty.getRawSupplementary((char)ch1,
166+ (char)ch2);
167+ }else if (ch2 != DONE) {
168+ // unmatched surrogate so back out
169+ previous();
170+ }
171+ }
172+ return ch1;
173+ }
174+
175+ /**
176+ * Decrement to the position of the previous code unit in the
177+ * text, and return it (pre-decrement semantics). If the
178+ * resulting index is less than 0, the index is reset to 0 and
179+ * DONE is returned.
180+ * @return the previous code unit in the text, or DONE if the new
181+ * index is before the start of the text.
182+ * @stable ICU 2.4
183+ */
184+ public abstract int previous();
185+
186+ /**
187+ * Sets the index to the specified index in the text.
188+ * @param index the index within the text.
189+ * @exception IndexOutOfBoundsException is thrown if an invalid index is
190+ * supplied
191+ * @stable ICU 2.4
192+ */
193+ public abstract void setIndex(int index);
194+
195+ //// for StringPrep
196+ /**
197+ * Fills the buffer with the underlying text storage of the iterator
198+ * If the buffer capacity is not enough a exception is thrown. The capacity
199+ * of the fill in buffer should at least be equal to length of text in the
200+ * iterator obtained by calling <code>getLength()</code>.
201+ * <b>Usage:</b>
202+ *
203+ * <code>
204+ * <pre>
205+ * UChacterIterator iter = new UCharacterIterator.getInstance(text);
206+ * char[] buf = new char[iter.getLength()];
207+ * iter.getText(buf);
208+ *
209+ * OR
210+ * char[] buf= new char[1];
211+ * int len = 0;
212+ * for(;;){
213+ * try{
214+ * len = iter.getText(buf);
215+ * break;
216+ * }catch(IndexOutOfBoundsException e){
217+ * buf = new char[iter.getLength()];
218+ * }
219+ * }
220+ * </pre>
221+ * </code>
222+ *
223+ * @param fillIn an array of chars to fill with the underlying UTF-16 code
224+ * units.
225+ * @param offset the position within the array to start putting the data.
226+ * @return the number of code units added to fillIn, as a convenience
227+ * @exception IndexOutOfBounds exception if there is not enough
228+ * room after offset in the array, or if offset < 0.
229+ * @stable ICU 2.4
230+ */
231+ public abstract int getText(char[] fillIn, int offset);
232+
233+ //// for StringPrep
234+ /**
235+ * Convenience override for <code>getText(char[], int)</code> that provides
236+ * an offset of 0.
237+ * @param fillIn an array of chars to fill with the underlying UTF-16 code
238+ * units.
239+ * @return the number of code units added to fillIn, as a convenience
240+ * @exception IndexOutOfBounds exception if there is not enough
241+ * room in the array.
242+ * @stable ICU 2.4
243+ */
244+ public final int getText(char[] fillIn) {
245+ return getText(fillIn, 0);
246+ }
247+
248+ //// for StringPrep
249+ /**
250+ * Convenience method for returning the underlying text storage as as string
251+ * @return the underlying text storage in the iterator as a string
252+ * @stable ICU 2.4
253+ */
254+ public String getText() {
255+ char[] text = new char[getLength()];
256+ getText(text);
257+ return new String(text);
258+ }
259+
260+ /**
261+ * Moves the current position by the number of code units
262+ * specified, either forward or backward depending on the sign
263+ * of delta (positive or negative respectively). If the resulting
264+ * index would be less than zero, the index is set to zero, and if
265+ * the resulting index would be greater than limit, the index is
266+ * set to limit.
267+ *
268+ * @param delta the number of code units to move the current
269+ * index.
270+ * @return the new index.
271+ * @exception IndexOutOfBoundsException is thrown if an invalid index is
272+ * supplied
273+ * @stable ICU 2.4
274+ *
275+ */
276+ public int moveIndex(int delta) {
277+ int x = Math.max(0, Math.min(getIndex() + delta, getLength()));
278+ setIndex(x);
279+ return x;
280+ }
281+
282+ /**
283+ * Creates a copy of this iterator, independent from other iterators.
284+ * If it is not possible to clone the iterator, returns null.
285+ * @return copy of this iterator
286+ * @stable ICU 2.4
287+ */
288+ public Object clone() throws CloneNotSupportedException{
289+ return super.clone();
290+ }
291+
292+}