85 lines
2.5 KiB
C
85 lines
2.5 KiB
C
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/*
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Copyright (c) 2005-2009 by Jakob Schroeter <js@camaya.net>
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This file is part of the gloox library. http://camaya.net/gloox
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This software is distributed under a license. The full license
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agreement can be found in the file LICENSE in this distribution.
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This software may not be copied, modified, sold or distributed
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other than expressed in the named license agreement.
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This software is distributed without any warranty.
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*/
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#ifndef MESSAGEFILTER_H__
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#define MESSAGEFILTER_H__
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#include "messagesession.h"
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namespace gloox
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{
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class Message;
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/**
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* @brief Virtual base class for message filters.
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*
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* A message filter is fed with all messages passing through a MessageSession. It can
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* modify the XML/XMPP structure and/or the message content at will. Messages arriving
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* from the server as well as messages sent to the server can be altered.
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*
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* Messages to be sent out are presented to the filter via the decorate() function, incoming
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* messages can be filtered in the -- filter() method.
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*
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* @author Jakob Schroeter <js@camaya.net>
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* @since 0.8
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*/
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class GLOOX_API MessageFilter
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{
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public:
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/**
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* Constructor.
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* @param parent The MessageSession to attach to.
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*/
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MessageFilter( MessageSession* parent );
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/**
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* Virtual Destructor.
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*/
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virtual ~MessageFilter();
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/**
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* Attaches this MessageFilter to the given MessageSession and hooks it into
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* the session's filter chain.
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* If this filter was attached to a different MessageSession before, it is
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* unregistered there prior to registering it with the new session.
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* @param session The MessageSession to hook into.
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*/
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virtual void attachTo( MessageSession* session );
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/**
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* This function receives a message right before it is sent out (there may be other filters
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* which get to see the message after this filter, though).
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* @param msg The tag to decorate. It contains the message to be sent.
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*/
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virtual void decorate( Message& msg ) = 0;
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/**
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* This function receives a message stanza right after it was received (there may be other filters
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* which got to see the stanza before this filter, though).
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* @param msg The complete message stanza.
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*/
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virtual void filter( Message& msg ) = 0;
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protected:
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void send( Message& msg ) { if( m_parent ) m_parent->send( msg ); }
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MessageSession* m_parent;
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};
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}
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#endif // MESSAGEFILTER_H__
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