package org.openamq.framing;
import org.apache.mina.common.ByteBuffer;
public class ContentHeaderBody extends AMQBody
{
public static final byte TYPE = 2;
public int classId;
public int weight;
/** unsigned long but java can't handle that anyway when allocating byte array */
public long bodySize;
/** must never be null */
public ContentHeaderProperties properties;
public ContentHeaderBody()
{
}
public ContentHeaderBody(ContentHeaderProperties props, int classId)
{
properties = props;
this.classId = classId;
}
public ContentHeaderBody(int classId, int weight, ContentHeaderProperties props, long bodySize)
{
this(props, classId);
this.weight = weight;
this.bodySize = bodySize;
}
protected byte getType()
{
return TYPE;
}
protected void populateFromBuffer(ByteBuffer buffer, long size) throws AMQFrameDecodingException
{
classId = buffer.getUnsignedShort();
weight = buffer.getUnsignedShort();
bodySize = buffer.getLong();
int propertyFlags = buffer.getUnsignedShort();
ContentHeaderPropertiesFactory factory = ContentHeaderPropertiesFactory.getInstance();
properties = factory.createContentHeaderProperties(classId, propertyFlags, buffer, (int)size - 14);
}
/**
* Helper method that is used currently by the persistence layer (by BDB at the moment).
* @param buffer
* @param size
* @return
* @throws AMQFrameDecodingException
*/
public static ContentHeaderBody createFromBuffer(ByteBuffer buffer, long size) throws AMQFrameDecodingException
{
ContentHeaderBody body = new ContentHeaderBody();
body.populateFromBuffer(buffer, size);
return body;
}
public int getSize()
{
return 2 + 2 + 8 + 2 + properties.getPropertyListSize();
}
public void writePayload(ByteBuffer buffer)
{
EncodingUtils.writeUnsignedShort(buffer, classId);
EncodingUtils.writeUnsignedShort(buffer, weight);
buffer.putLong(bodySize);
EncodingUtils.writeUnsignedShort(buffer, properties.getPropertyFlags());
properties.writePropertyListPayload(buffer);
}
public static AMQFrame createAMQFrame(int channelId, int classId, int weight, BasicContentHeaderProperties properties,
long bodySize)
{
final AMQFrame frame = new AMQFrame();
frame.channel = channelId;
frame.bodyFrame = new ContentHeaderBody(classId, weight, properties, bodySize);
return frame;
}
public static AMQFrame createAMQFrame(int channelId, ContentHeaderBody body)
{
final AMQFrame frame = new AMQFrame();
frame.channel = channelId;
frame.bodyFrame = body;
return frame;
}
}