pjs/grendel/calypso/util/CharArrayIterator.java

124 строки
2.6 KiB
Java
Исходник Обычный вид История

1998-09-09 04:52:38 +04:00
/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil -*-
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.0 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* The Original Code is the Grendel mail/news client.
*
* The Initial Developer of the Original Code is Netscape Communications
* Corporation. Portions created by Netscape are Copyright (C) 1997
* Netscape Communications Corporation. All Rights Reserved.
*/
package calypso.util;
import java.text.*;
public final class CharArrayIterator implements CharacterIterator
{
private char[] fText;
private int fStart;
private int fEnd;
private int fPosition;
public CharArrayIterator(char[] aText, int aStartOffset, int aLength)
{
int endOffset = aStartOffset + aLength;
if (aStartOffset < 0 || aLength < 0 ||
(aStartOffset + aLength) > aText.length)
throw new IllegalArgumentException("parameter out of range");
fText = aText;
fStart = aStartOffset;
fEnd = endOffset;
fPosition = 0;
}
public char first()
{
fPosition = fStart;
return fText[fPosition];
}
public char last()
{
fPosition = fEnd - 1;
return fText[fPosition];
}
public char current()
{
if (fPosition < fStart || fPosition >= fEnd)
return CharacterIterator.DONE;
return fText[fPosition];
}
public char next()
{
fPosition += 1;
if (fPosition >= fEnd)
return CharacterIterator.DONE;
return fText[fPosition];
}
public char previous()
{
fPosition -= 1;
if (fPosition < fStart)
return CharacterIterator.DONE;
return fText[fPosition];
}
public char setIndex(int aPosition)
{
if (aPosition < fStart || aPosition >= fEnd)
throw new IllegalArgumentException("aPosition out of range");
fPosition = aPosition;
return fText[fPosition];
}
public int getBeginIndex()
{
return fStart;
}
public int getEndIndex()
{
return fEnd;
}
public int getIndex()
{
return fPosition;
}
public Object clone()
{
try
{
CharArrayIterator other
= (CharArrayIterator) super.clone();
return other;
}
catch (CloneNotSupportedException e)
{
throw new InternalError();
}
}
}