127 lines
2.6 KiB
Java
127 lines
2.6 KiB
Java
/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil -*-
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*
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* The contents of this file are subject to the Mozilla Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is the Grendel mail/news client.
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*
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* The Initial Developer of the Original Code is Netscape Communications
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* Corporation. Portions created by Netscape are
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* Copyright (C) 1997 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*/
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package calypso.util;
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import java.text.*;
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public final class CharArrayIterator implements CharacterIterator
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{
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private char[] fText;
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private int fStart;
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private int fEnd;
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private int fPosition;
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public CharArrayIterator(char[] aText, int aStartOffset, int aLength)
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{
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int endOffset = aStartOffset + aLength;
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if (aStartOffset < 0 || aLength < 0 ||
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(aStartOffset + aLength) > aText.length)
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throw new IllegalArgumentException("parameter out of range");
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fText = aText;
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fStart = aStartOffset;
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fEnd = endOffset;
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fPosition = 0;
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}
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public char first()
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{
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fPosition = fStart;
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return fText[fPosition];
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}
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public char last()
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{
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fPosition = fEnd - 1;
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return fText[fPosition];
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}
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public char current()
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{
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if (fPosition < fStart || fPosition >= fEnd)
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return CharacterIterator.DONE;
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return fText[fPosition];
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}
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public char next()
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{
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fPosition += 1;
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if (fPosition >= fEnd)
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return CharacterIterator.DONE;
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return fText[fPosition];
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}
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public char previous()
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{
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fPosition -= 1;
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if (fPosition < fStart)
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return CharacterIterator.DONE;
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return fText[fPosition];
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}
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public char setIndex(int aPosition)
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{
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if (aPosition < fStart || aPosition >= fEnd)
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throw new IllegalArgumentException("aPosition out of range");
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fPosition = aPosition;
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return fText[fPosition];
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}
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public int getBeginIndex()
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{
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return fStart;
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}
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public int getEndIndex()
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{
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return fEnd;
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}
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public int getIndex()
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{
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return fPosition;
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}
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public Object clone()
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{
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try
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{
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CharArrayIterator other
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= (CharArrayIterator) super.clone();
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return other;
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}
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catch (CloneNotSupportedException e)
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{
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throw new InternalError();
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}
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}
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}
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