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28 #ifndef TALK_XMPP_MODULEIMPL_H_
29 #define TALK_XMPP_MODULEIMPL_H_
31 #include "talk/xmpp/module.h"
32 #include "talk/xmpp/xmppengine.h"
36 //! This is the base implementation class for extension modules.
37 //! An engine is registered with the module and the module then hooks the
38 //! appropriate parts of the engine to implement that set of features. It is
39 //! important to unregister modules before destructing the engine.
40 class XmppModuleImpl {
43 virtual ~XmppModuleImpl();
45 //! Register the engine with the module. Only one engine can be associated
46 //! with a module at a time. This method will return an error if there is
47 //! already an engine registered.
48 XmppReturnStatus RegisterEngine(XmppEngine* engine);
50 //! Gets the engine that this module is attached to.
53 //! Process the given stanza.
54 //! The module must return true if it has handled the stanza.
55 //! A false return value causes the stanza to be passed on to
56 //! the next registered handler.
57 virtual bool HandleStanza(const XmlElement *) { return false; };
61 //! The ModuleSessionHelper nested class allows the Module
62 //! to hook into and get stanzas and events from the engine.
63 class ModuleStanzaHandler : public XmppStanzaHandler {
64 friend class XmppModuleImpl;
66 ModuleStanzaHandler(XmppModuleImpl* module) :
70 bool HandleStanza(const XmlElement* stanza) {
71 return module_->HandleStanza(stanza);
74 XmppModuleImpl* module_;
77 friend class ModuleStanzaHandler;
80 ModuleStanzaHandler stanza_handler_;
84 // This macro will implement the XmppModule interface for a class
85 // that derives from both XmppModuleImpl and XmppModule
86 #define IMPLEMENT_XMPPMODULE \
87 XmppReturnStatus RegisterEngine(XmppEngine* engine) { \
88 return XmppModuleImpl::RegisterEngine(engine); \
93 #endif // TALK_XMPP_MODULEIMPL_H_