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package org.apache.qpid.nclient.util;
/*
*
* 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.
*
*/
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.*;
import org.apache.qpid.transport.DeliveryProperties;
import org.apache.qpid.transport.MessageProperties;
import org.apache.qpid.transport.Header;
import org.apache.qpid.api.Message;
/**
* <p>A Simple implementation of the message interface
* for small messages. When the readData methods are called
* we assume the message is complete. i.e there want be any
* appendData operations after that.</p>
*
* <p>If you need large message support please see
* <code>FileMessage</code> and <code>StreamingMessage</code>
* </p>
*/
public class ByteBufferMessage implements Message
{
private List<ByteBuffer> _data;// = new ArrayList<ByteBuffer>();
private ByteBuffer _readBuffer;
private int _dataSize;
private DeliveryProperties _currentDeliveryProps;
private MessageProperties _currentMessageProps;
private int _transferId;
private Header _header;
public ByteBufferMessage(MessageProperties messageProperties, DeliveryProperties deliveryProperties)
{
_currentMessageProps = messageProperties;
_currentDeliveryProps = deliveryProperties;
}
public void setHeader(Header header) {
_header = header;
}
public Header getHeader() {
return _header;
}
public ByteBufferMessage()
{
_currentDeliveryProps = new DeliveryProperties();
_currentMessageProps = new MessageProperties();
}
public ByteBufferMessage(int transferId)
{
_transferId = transferId;
}
public int getMessageTransferId()
{
return _transferId;
}
public void clearData()
{
_data = new LinkedList<ByteBuffer>();
_readBuffer = null;
}
public void appendData(byte[] src) throws IOException
{
appendData(ByteBuffer.wrap(src));
}
/**
* write the data from the current position up to the buffer limit
*/
public void appendData(ByteBuffer src) throws IOException
{
if(_data == null)
{
_data = Collections.singletonList(src);
}
else
{
if(_data.size() == 1)
{
_data = new ArrayList<ByteBuffer>(_data);
}
_data.add(src);
}
_dataSize += src.remaining();
}
public DeliveryProperties getDeliveryProperties()
{
return _currentDeliveryProps;
}
public MessageProperties getMessageProperties()
{
return _currentMessageProps;
}
public void setDeliveryProperties(DeliveryProperties props)
{
_currentDeliveryProps = props;
}
public void setMessageProperties(MessageProperties props)
{
_currentMessageProps = props;
}
public void readData(byte[] target)
{
getReadBuffer().get(target);
}
public ByteBuffer readData()
{
return getReadBuffer();
}
private void buildReadBuffer()
{
//optimize for the simple cases
if(_data.size() == 1)
{
_readBuffer = _data.get(0).duplicate();
}
else
{
_readBuffer = ByteBuffer.allocate(_dataSize);
for(ByteBuffer buf:_data)
{
_readBuffer.put(buf);
}
_readBuffer.flip();
}
}
private ByteBuffer getReadBuffer()
{
if (_readBuffer != null )
{
return _readBuffer.slice();
}
else
{
if (_data.size() >0)
{
buildReadBuffer();
return _readBuffer.slice();
}
else
{
return ByteBuffer.allocate(0);
}
}
}
//hack for testing
@Override public String toString()
{
ByteBuffer temp = getReadBuffer();
byte[] b = new byte[temp.remaining()];
temp.get(b);
return new String(b);
}
}
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