author | avstepan |
Tue, 19 May 2015 16:04:14 +0400 | |
changeset 30655 | d83f50188ca9 |
parent 28059 | e576535359cc |
child 31680 | 88c53c2293b4 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2003, 2006, 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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/* |
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******************************************************************************* |
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* (C) Copyright IBM Corp. 1996-2005 - All Rights Reserved * |
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* * |
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* The original version of this source code and documentation is copyrighted * |
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* and owned by IBM, These materials are provided under terms of a License * |
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* Agreement between IBM and Sun. This technology is protected by multiple * |
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* US and International patents. This notice and attribution to IBM may not * |
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* to removed. * |
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******************************************************************************* |
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*/ |
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package sun.text.normalizer; |
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import java.text.CharacterIterator; |
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/** |
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* Abstract class that defines an API for iteration on text objects.This is an |
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* interface for forward and backward iteration and random access into a text |
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* object. Forward iteration is done with post-increment and backward iteration |
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* is done with pre-decrement semantics, while the |
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* <code>java.text.CharacterIterator</code> interface methods provided forward |
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* iteration with "pre-increment" and backward iteration with pre-decrement |
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* semantics. This API is more efficient for forward iteration over code points. |
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* The other major difference is that this API can do both code unit and code point |
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* iteration, <code>java.text.CharacterIterator</code> can only iterate over |
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* code units and is limited to BMP (0 - 0xFFFF) |
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* @author Ram |
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* @stable ICU 2.4 |
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*/ |
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public abstract class UCharacterIterator |
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implements Cloneable { |
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/** |
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* Protected default constructor for the subclasses |
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* @stable ICU 2.4 |
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*/ |
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protected UCharacterIterator(){ |
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} |
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/** |
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* Indicator that we have reached the ends of the UTF16 text. |
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* Moved from UForwardCharacterIterator.java |
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* @stable ICU 2.4 |
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*/ |
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public static final int DONE = -1; |
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// static final methods ---------------------------------------------------- |
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/** |
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* Returns a <code>UCharacterIterator</code> object given a |
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* source string. |
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* @param source a string |
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* @return UCharacterIterator object |
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* @exception IllegalArgumentException if the argument is null |
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* @stable ICU 2.4 |
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*/ |
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public static final UCharacterIterator getInstance(String source){ |
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return new ReplaceableUCharacterIterator(source); |
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} |
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//// for StringPrep |
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/** |
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* Returns a <code>UCharacterIterator</code> object given a |
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* source StringBuffer. |
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* @param source an string buffer of UTF-16 code units |
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* @return UCharacterIterator object |
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* @exception IllegalArgumentException if the argument is null |
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* @stable ICU 2.4 |
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*/ |
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public static final UCharacterIterator getInstance(StringBuffer source){ |
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return new ReplaceableUCharacterIterator(source); |
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} |
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/** |
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* Returns a <code>UCharacterIterator</code> object given a |
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* CharacterIterator. |
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* @param source a valid CharacterIterator object. |
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* @return UCharacterIterator object |
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* @exception IllegalArgumentException if the argument is null |
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* @stable ICU 2.4 |
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*/ |
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public static final UCharacterIterator getInstance(CharacterIterator source){ |
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return new CharacterIteratorWrapper(source); |
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} |
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// public methods ---------------------------------------------------------- |
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/** |
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* Returns the code unit at the current index. If index is out |
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* of range, returns DONE. Index is not changed. |
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* @return current code unit |
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* @stable ICU 2.4 |
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*/ |
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public abstract int current(); |
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/** |
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* Returns the length of the text |
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* @return length of the text |
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* @stable ICU 2.4 |
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*/ |
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public abstract int getLength(); |
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/** |
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* Gets the current index in text. |
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* @return current index in text. |
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* @stable ICU 2.4 |
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*/ |
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public abstract int getIndex(); |
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/** |
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* Returns the UTF16 code unit at index, and increments to the next |
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* code unit (post-increment semantics). If index is out of |
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* range, DONE is returned, and the iterator is reset to the limit |
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* of the text. |
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* @return the next UTF16 code unit, or DONE if the index is at the limit |
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* of the text. |
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* @stable ICU 2.4 |
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*/ |
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public abstract int next(); |
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/** |
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* Returns the code point at index, and increments to the next code |
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* point (post-increment semantics). If index does not point to a |
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* valid surrogate pair, the behavior is the same as |
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* <code>next()</code>. Otherwise the iterator is incremented past |
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* the surrogate pair, and the code point represented by the pair |
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* is returned. |
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* @return the next codepoint in text, or DONE if the index is at |
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* the limit of the text. |
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* @stable ICU 2.4 |
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*/ |
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public int nextCodePoint(){ |
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int ch1 = next(); |
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if(UTF16.isLeadSurrogate((char)ch1)){ |
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int ch2 = next(); |
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if(UTF16.isTrailSurrogate((char)ch2)){ |
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return UCharacterProperty.getRawSupplementary((char)ch1, |
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(char)ch2); |
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}else if (ch2 != DONE) { |
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// unmatched surrogate so back out |
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previous(); |
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} |
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} |
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return ch1; |
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} |
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/** |
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* Decrement to the position of the previous code unit in the |
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* text, and return it (pre-decrement semantics). If the |
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* resulting index is less than 0, the index is reset to 0 and |
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* DONE is returned. |
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* @return the previous code unit in the text, or DONE if the new |
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* index is before the start of the text. |
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* @stable ICU 2.4 |
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*/ |
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public abstract int previous(); |
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/** |
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* Sets the index to the specified index in the text. |
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* @param index the index within the text. |
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* @exception IndexOutOfBoundsException is thrown if an invalid index is |
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* supplied |
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* @stable ICU 2.4 |
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*/ |
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public abstract void setIndex(int index); |
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//// for StringPrep |
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/** |
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* Fills the buffer with the underlying text storage of the iterator |
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* If the buffer capacity is not enough a exception is thrown. The capacity |
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* of the fill in buffer should at least be equal to length of text in the |
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* iterator obtained by calling <code>getLength()</code>. |
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* <b>Usage:</b> |
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* |
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* <pre>{@code |
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* UChacterIterator iter = new UCharacterIterator.getInstance(text); |
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* char[] buf = new char[iter.getLength()]; |
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* iter.getText(buf); |
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* |
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* OR |
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* char[] buf= new char[1]; |
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* int len = 0; |
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* for(;;){ |
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* try{ |
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* len = iter.getText(buf); |
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* break; |
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* }catch(IndexOutOfBoundsException e){ |
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* buf = new char[iter.getLength()]; |
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* } |
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* } |
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* }</pre> |
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* |
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* @param fillIn an array of chars to fill with the underlying UTF-16 code |
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* units. |
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* @param offset the position within the array to start putting the data. |
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* @return the number of code units added to fillIn, as a convenience |
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* @exception IndexOutOfBounds exception if there is not enough |
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* room after offset in the array, or if offset {@literal <} 0. |
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* @stable ICU 2.4 |
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*/ |
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public abstract int getText(char[] fillIn, int offset); |
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//// for StringPrep |
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/** |
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* Convenience override for <code>getText(char[], int)</code> that provides |
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* an offset of 0. |
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* @param fillIn an array of chars to fill with the underlying UTF-16 code |
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* units. |
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* @return the number of code units added to fillIn, as a convenience |
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* @exception IndexOutOfBounds exception if there is not enough |
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* room in the array. |
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* @stable ICU 2.4 |
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*/ |
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public final int getText(char[] fillIn) { |
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return getText(fillIn, 0); |
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} |
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//// for StringPrep |
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/** |
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28059
e576535359cc
8067377: My hobby: caning, then then canning, the the can-can
martin
parents:
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diff
changeset
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* Convenience method for returning the underlying text storage as a string |
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* @return the underlying text storage in the iterator as a string |
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* @stable ICU 2.4 |
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*/ |
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public String getText() { |
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char[] text = new char[getLength()]; |
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getText(text); |
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return new String(text); |
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} |
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/** |
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* Moves the current position by the number of code units |
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* specified, either forward or backward depending on the sign |
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* of delta (positive or negative respectively). If the resulting |
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* index would be less than zero, the index is set to zero, and if |
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* the resulting index would be greater than limit, the index is |
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* set to limit. |
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* |
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* @param delta the number of code units to move the current |
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* index. |
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* @return the new index. |
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* @exception IndexOutOfBoundsException is thrown if an invalid index is |
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* supplied |
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* @stable ICU 2.4 |
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* |
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*/ |
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public int moveIndex(int delta) { |
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int x = Math.max(0, Math.min(getIndex() + delta, getLength())); |
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setIndex(x); |
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return x; |
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} |
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/** |
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* Creates a copy of this iterator, independent from other iterators. |
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* If it is not possible to clone the iterator, returns null. |
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* @return copy of this iterator |
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* @stable ICU 2.4 |
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*/ |
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public Object clone() throws CloneNotSupportedException{ |
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return super.clone(); |
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} |
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} |