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package org.apache.qpid.nclient.util;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.LinkedList;
import java.util.Queue;
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 Queue<ByteBuffer> _data = new LinkedList<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
{
_data.offer(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) throws IOException
{
getReadBuffer().get(target);
}
public ByteBuffer readData() throws IOException
{
return getReadBuffer();
}
private void buildReadBuffer()
{
//optimize for the simple cases
if(_data.size() == 1)
{
_readBuffer = _data.element().duplicate();
}
else
{
_readBuffer = ByteBuffer.allocate(_dataSize);
for(ByteBuffer buf:_data)
{
_readBuffer.put(buf);
}
_readBuffer.flip();
}
}
private ByteBuffer getReadBuffer() throws IOException
{
if (_readBuffer != null )
{
return _readBuffer.slice();
}
else
{
if (_data.size() >0)
{
buildReadBuffer();
return _readBuffer.slice();
}
else
{
throw new IOException("No Data to read");
}
}
}
//hack for testing
@Override public String toString()
{
try
{
ByteBuffer temp = getReadBuffer();
byte[] b = new byte[temp.remaining()];
temp.get(b);
return new String(b);
}
catch(IOException e)
{
return "No data";
}
}
}
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