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/*******************************************************************************
* Copyright (c) 2008 xored software, Inc.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* xored software, Inc. - initial API and Implementation (Alex Panchenko)
*******************************************************************************/
/**
* {@link CharSequence} implementation backing by the char[]
*/
public class CharArraySequence implements CharSequence {
private final char[] buff;
private final int offset;
private final int count;
/**
* @param buff
*/
public CharArraySequence(char[] buff) {
this(buff, 0, buff.length);
}
/**
* @param buff
* @param count
*/
public CharArraySequence(char[] buff, int count) {
this(buff, 0, count);
}
/**
* @param buff
* @param offset
* @param count
*/
public CharArraySequence(char[] buff, int offset, int count) {
this.buff = buff;
this.offset = offset;
this.count = count;
}
/*
* @see java.lang.CharSequence#charAt(int)
*/
public char charAt(int index) {
if (index < 0 || index >= count) {
throw new StringIndexOutOfBoundsException(index);
}
return buff[offset + index];
}
/*
* @see java.lang.CharSequence#length()
*/
public int length() {
return count;
}
/*
* @see java.lang.CharSequence#subSequence(int, int)
*/
public CharSequence subSequence(int beginIndex, int endIndex) {
if (beginIndex < 0) {
throw new StringIndexOutOfBoundsException(beginIndex);
}
if (endIndex > count) {
throw new StringIndexOutOfBoundsException(endIndex);
}
if (beginIndex > endIndex) {
throw new StringIndexOutOfBoundsException(endIndex - beginIndex);
}
return ((beginIndex == 0) && (endIndex == count)) ? this
: new CharArraySequence(buff, offset + beginIndex, endIndex
- beginIndex);
}
public String toString() {
return new String(this.buff, this.offset, this.count);
}
}
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