/*
* Copyright (c) 2005, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
*******************************************************************************
* (C) Copyright IBM Corp. 1996-2005 - All Rights Reserved *
* *
* The original version of this source code and documentation is copyrighted *
* and owned by IBM, These materials are provided under terms of a License *
* Agreement between IBM and Sun. This technology is protected by multiple *
* US and International patents. This notice and attribution to IBM may not *
* to removed. *
*******************************************************************************
*/
package sun.text.normalizer;
/**
* DLF docs must define behavior when Replaceable is mutated underneath
* the iterator.
*
* This and ICUCharacterIterator share some code, maybe they should share
* an implementation, or the common state and implementation should be
* moved up into UCharacterIterator.
*
* What are first, last, and getBeginIndex doing here?!?!?!
*/
public class ReplaceableUCharacterIterator extends UCharacterIterator {
// public constructor ------------------------------------------------------
/**
* Public constructor
* @param str text which the iterator will be based on
*/
public ReplaceableUCharacterIterator(String str){
if(str==null){
throw new IllegalArgumentException();
}
this.replaceable = new ReplaceableString(str);
this.currentIndex = 0;
}
//// for StringPrep
/**
* Public constructor
* @param buf buffer of text on which the iterator will be based
*/
public ReplaceableUCharacterIterator(StringBuffer buf){
if(buf==null){
throw new IllegalArgumentException();
}
this.replaceable = new ReplaceableString(buf);
this.currentIndex = 0;
}
// public methods ----------------------------------------------------------
/**
* Creates a copy of this iterator, does not clone the underlying
* <code>Replaceable</code>object
* @return copy of this iterator
*/
public Object clone(){
try {
return super.clone();
} catch (CloneNotSupportedException e) {
return null; // never invoked
}
}
/**
* Returns the current UTF16 character.
* @return current UTF16 character
*/
public int current(){
if (currentIndex < replaceable.length()) {
return replaceable.charAt(currentIndex);
}
return DONE;
}
/**
* Returns the length of the text
* @return length of the text
*/
public int getLength(){
return replaceable.length();
}
/**
* Gets the current currentIndex in text.
* @return current currentIndex in text.
*/
public int getIndex(){
return currentIndex;
}
/**
* Returns next UTF16 character and increments the iterator's currentIndex by 1.
* If the resulting currentIndex is greater or equal to the text length, the
* currentIndex is reset to the text length and a value of DONECODEPOINT is
* returned.
* @return next UTF16 character in text or DONE if the new currentIndex is off the
* end of the text range.
*/
public int next(){
if (currentIndex < replaceable.length()) {
return replaceable.charAt(currentIndex++);
}
return DONE;
}
/**
* Returns previous UTF16 character and decrements the iterator's currentIndex by
* 1.
* If the resulting currentIndex is less than 0, the currentIndex is reset to 0 and a
* value of DONECODEPOINT is returned.
* @return next UTF16 character in text or DONE if the new currentIndex is off the
* start of the text range.
*/
public int previous(){
if (currentIndex > 0) {
return replaceable.charAt(--currentIndex);
}
return DONE;
}
/**
* <p>Sets the currentIndex to the specified currentIndex in the text and returns that
* single UTF16 character at currentIndex.
* This assumes the text is stored as 16-bit code units.</p>
* @param currentIndex the currentIndex within the text.
* @exception IllegalArgumentException is thrown if an invalid currentIndex is
* supplied. i.e. currentIndex is out of bounds.
* @return the character at the specified currentIndex or DONE if the specified
* currentIndex is equal to the end of the text.
*/
public void setIndex(int currentIndex) {
if (currentIndex < 0 || currentIndex > replaceable.length()) {
throw new IllegalArgumentException();
}
this.currentIndex = currentIndex;
}
//// for StringPrep
public int getText(char[] fillIn, int offset){
int length = replaceable.length();
if(offset < 0 || offset + length > fillIn.length){
throw new IndexOutOfBoundsException(Integer.toString(length));
}
replaceable.getChars(0,length,fillIn,offset);
return length;
}
// private data members ----------------------------------------------------
/**
* Replacable object
*/
private Replaceable replaceable;
/**
* Current currentIndex
*/
private int currentIndex;
}