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/*
This file is part of GNUnet.
Copyright (C) 2011, 2012 Christian Grothoff (and other contributing authors)
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 3, or (at your
option) any later version.
GNUnet is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNUnet; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
package org.gnunet.util;
import org.gnunet.construct.*;
/**
* Every message used to communicate between gnunet components uses this format.
* First, a header is sent, containing the size of the overall message (including the header), as
* well as the type of the message. After that the message body is sent, whose format is specified
* by the message type.
*
*/
public final class GnunetMessage implements Message {
public static final int MINIMAL_SIZE = Header.SIZE;
/**
* The header of every gnunet message.
*/
public static final class Header implements Message {
public static final int SIZE = 4;
@FrameSize
@UInt16
public int messageSize;
@UInt16
public int messageType;
}
/**
* The common interface for every message body.
*
*/
public static interface Body extends MessageUnion {
}
/**
* Create a GnunetMessage from its body only. The header is added and filled with the relevant information
* automatically.
*
* @param b the message body to convert
* @return a complete and valid gnunet message
*/
public static GnunetMessage fromBody(Body b) {
GnunetMessage msg = new GnunetMessage();
msg.header = new Header();
msg.header.messageSize = Header.SIZE + Construct.getSize(b);
msg.header.messageType = MessageLoader.getUnionTag(GnunetMessage.Body.class, b.getClass());
msg.body = b;
return msg;
}
@NestedMessage
public Header header;
@Union(tag = "header.messageType")
public Body body;
}
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