org.eclipse.jetty.websocket.common.extensions.compress.ByteAccumulator Maven / Gradle / Ivy
//
// ========================================================================
// Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package org.eclipse.jetty.websocket.common.extensions.compress;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.jetty.util.BufferUtil;
import org.eclipse.jetty.websocket.api.MessageTooLargeException;
public class ByteAccumulator
{
private final List chunks = new ArrayList<>();
private final int maxSize;
private int length = 0;
public ByteAccumulator(int maxOverallBufferSize)
{
this.maxSize = maxOverallBufferSize;
}
public void addChunk(byte buf[], int offset, int length)
{
if (this.length + length > maxSize)
{
throw new MessageTooLargeException("Frame is too large");
}
chunks.add(new Chunk(buf, offset, length));
this.length += length;
}
public int getLength()
{
return length;
}
public void transferTo(ByteBuffer buffer)
{
if (buffer.remaining() < length)
throw new IllegalArgumentException();
int position = buffer.position();
for (Chunk chunk : chunks)
{
buffer.put(chunk.buffer, chunk.offset, chunk.length);
}
BufferUtil.flipToFlush(buffer, position);
}
private static class Chunk
{
private final byte[] buffer;
private final int offset;
private final int length;
private Chunk(byte[] buffer, int offset, int length)
{
this.buffer = buffer;
this.offset = offset;
this.length = length;
}
}
}