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/*
* Copyright (c) 2008-2010 Mozilla Foundation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
package nu.validator.htmlparser.impl;
import nu.validator.htmlparser.annotation.NoLength;
/**
* An UTF-16 buffer that knows the start and end indeces of its unconsumed
* content.
*
* @version $Id$
* @author hsivonen
*/
public final class UTF16Buffer {
/**
* The backing store of the buffer. May be larger than the logical content
* of this <code>UTF16Buffer</code>.
*/
private final @NoLength char[] buffer;
/**
* The index of the first unconsumed character in the backing buffer.
*/
private int start;
/**
* The index of the slot immediately after the last character in the backing
* buffer that is part of the logical content of this
* <code>UTF16Buffer</code>.
*/
private int end;
//[NOCPP[
/**
* Constructor for wrapping an existing UTF-16 code unit array.
*
* @param buffer
* the backing buffer
* @param start
* the index of the first character to consume
* @param end
* the index immediately after the last character to consume
*/
public UTF16Buffer(@NoLength char[] buffer, int start, int end) {
this.buffer = buffer;
this.start = start;
this.end = end;
}
// ]NOCPP]
/**
* Returns the start index.
*
* @return the start index
*/
public int getStart() {
return start;
}
/**
* Sets the start index.
*
* @param start
* the start index
*/
public void setStart(int start) {
this.start = start;
}
/**
* Returns the backing buffer.
*
* @return the backing buffer
*/
public @NoLength char[] getBuffer() {
return buffer;
}
/**
* Returns the end index.
*
* @return the end index
*/
public int getEnd() {
return end;
}
/**
* Checks if the buffer has data left.
*
* @return <code>true</code> if there's data left
*/
public boolean hasMore() {
return start < end;
}
/**
* Returns <code>end - start</code>.
*
* @return <code>end - start</code>
*/
public int getLength() {
return end - start;
}
/**
* Adjusts the start index to skip over the first character if it is a line
* feed and the previous character was a carriage return.
*
* @param lastWasCR
* whether the previous character was a carriage return
*/
public void adjust(boolean lastWasCR) {
if (lastWasCR && buffer[start] == '\n') {
start++;
}
}
/**
* Sets the end index.
*
* @param end
* the end index
*/
public void setEnd(int end) {
this.end = end;
}
}