/* $Id$ */
/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (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.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.manifoldcf.connectorcommon.fuzzyml;
import org.apache.manifoldcf.core.interfaces.*;
import java.util.*;
/** This class represents a variable-length buffer for bytes.
*/
public class ByteBuffer
{
protected static final int arraySize = 65536;
protected static final int arrayShift = 16;
protected final List<byte[]> arrayOfArrays = new ArrayList<byte[]>();
protected int totalBytes = 0;
protected int currentIndex = -1;
protected byte[] currentBuffer = null;
/** Constructor */
public ByteBuffer()
{
}
/** Clear the buffer.
*/
public void clear()
{
arrayOfArrays.clear();
totalBytes = 0;
currentIndex = -1;
currentBuffer = null;
}
/** Get the current buffer length.
*/
public int size()
{
return totalBytes;
}
/** Add a byte to the buffer at the end.
*/
public void appendByte(byte b)
{
if (currentIndex == arraySize || currentIndex == -1)
{
currentBuffer = new byte[arraySize];
arrayOfArrays.add(currentBuffer);
currentIndex = 0;
}
currentBuffer[currentIndex++] = b;
totalBytes++;
}
/** Read a byte from the buffer from the specified place.
*/
public byte readByte(int position)
{
int arrayNumber = position >> 16;
int offset = position & (arraySize-1);
return arrayOfArrays.get(arrayNumber)[offset];
}
}