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#ifndef RLV_EVENTEMITTER_H
#define RLV_EVENTEMITTER_H
#include <algorithm>
#include <typeinfo>
#include <list>
#include "lluuid.h"
#include "rlvhelper.h"
// ============================================================================
/*
* RlvEvent
* ========
* Passed to observer event handlers (contains the same paramaters as RlvHandler::processXXXCommand)
*/
class RlvEvent
{
public:
RlvEvent(const LLUUID& uuid, const RlvCommand& rlvCmd) : m_UUID(uuid), m_rlvCmd(rlvCmd) {}
virtual ~RlvEvent() {}
const LLUUID& getSenderID() const { return m_UUID; };
const RlvCommand& getCommand() const { return m_rlvCmd; };
protected:
LLUUID m_UUID;
RlvCommand m_rlvCmd;
};
// ============================================================================
/*
* RlvObserver
* ===========
* Provides a way to extend the existing command set without changing the main RlvHandler class
*
* Steps:
* - derive your class from RlvObserver
* - override any of the event functions you need
* - add it as an observer: gRlvHandler.addObserver(new RlbObserverDerivedClass());
* - done
*
* Notes:
* - as long as you don't call gRlvHandler.remObserver() your class will be cleaned up from
* RlvEventEmitter destructor (see below)
* - event handlers are called only if RlvHandler didn't handle it so while you can
* add a new command @foobar=n, you won't get called for @detach=n
* - event handlers are called *after* the command is added so a call to
* RlvHandler::hasBehaviour("foobar") would return TRUE
* - return TRUE if you handled the command (won't get passed on to the next observer)
* return FALSE if you didn't handle the command (gets passed on to the next observer)
*
*/
class RlvObserver
{
public:
virtual ~RlvObserver() {}
typedef RlvEvent EventType;
virtual BOOL onAddCommand(const EventType& rlvEvent) { return FALSE; }
virtual BOOL onRemoveCommand(const EventType& rlvEvent) { return FALSE; }
virtual BOOL onReplyCommand(const EventType& rlvEvent) { return FALSE; }
virtual BOOL onForceCommand(const EventType& rlvEvent) { return FALSE; }
};
// ============================================================================
/*
* RlvEventEmitter
* ===============
* Essentially a slightly modified eventEmitter (see lleventemitter.h)
*
* Changes:
* - if an event handler returns TRUE then no further observers are notified
* - cleans up the (remaining) observers in the destructor
*/
template < class T >
class RlvEventEmitter
{
public:
typedef typename T::EventType EventType;
typedef std::list< T* > ObserverContainer;
typedef BOOL ( T::*observerMethod )( const EventType& );
protected:
ObserverContainer observers;
public:
RlvEventEmitter() { };
~RlvEventEmitter()
{
clearObservers();
}
BOOL addObserver ( T* observerIn )
{
if ( ! observerIn )
return FALSE;
// check if observer already exists
if ( std::find ( observers.begin (), observers.end (), observerIn ) != observers.end () )
return FALSE;
// save it
observers.push_back ( observerIn );
return true;
}
BOOL remObserver ( T* observerIn )
{
if ( ! observerIn )
return FALSE;
observers.remove ( observerIn );
return TRUE;
}
void clearObservers()
{
typename std::list< T* >::iterator iter = observers.begin ();
while (iter != observers.end ())
{
delete *iter;
++iter;
};
observers.clear();
}
BOOL update ( observerMethod method, const EventType& msgIn )
{
typename std::list< T* >::iterator iter = observers.begin ();
BOOL fContinue = TRUE;
while ( (iter != observers.end ()) && (fContinue) )
{
fContinue = !( ( ( *iter )->*method ) ( msgIn ) );
++iter;
};
return !fContinue;
}
};
// ============================================================================
class RlvBehaviourObserver
{
public:
virtual ~RlvBehaviourObserver() {}
virtual void changed(const RlvCommand& rlvCmd, bool fInternal) = 0;
};
// ============================================================================
class RlvBehaviourNotifyObserver : public RlvBehaviourObserver
{
public:
virtual ~RlvBehaviourNotifyObserver() { }
void changed(const RlvCommand& rlvCmd, bool fInternal)
{
if ( (fInternal) || ((RLV_TYPE_ADD != rlvCmd.getParamType()) && (RLV_TYPE_REMOVE != rlvCmd.getParamType())) )
return;
std::string strCmd = rlvCmd.asString();
std::string strNotify = llformat("/%s=%c", strCmd.c_str(), (RLV_TYPE_ADD == rlvCmd.getParamType()) ? 'n' : 'y');
for (std::multimap<LLUUID, notifyData>::const_iterator itNotify = m_Notifications.begin();
itNotify != m_Notifications.end(); ++itNotify)
{
if ( (itNotify->second.strFilter.empty()) || (std::string::npos != strCmd.find(itNotify->second.strFilter)) )
rlvSendChatReply(itNotify->second.nChannel, strNotify);
}
}
void addNotify(const LLUUID& idObj, S32 nChannel, const std::string& strFilter)
{
m_Notifications.insert(std::pair<LLUUID, notifyData>(idObj, notifyData(nChannel, strFilter)));
}
void clearNotify(const LLUUID& idObj)
{
m_Notifications.erase(idObj);
}
bool hasNotify()
{
return (m_Notifications.size() != 0);
}
void removeNotify(const LLUUID& idObj, S32 nChannel, const std::string& strFilter)
{
for (std::multimap<LLUUID, notifyData>::iterator itNotify = m_Notifications.lower_bound(idObj),
endNotify = m_Notifications.upper_bound(idObj); itNotify != endNotify; ++itNotify)
{
if ( (itNotify->second.nChannel == nChannel) && (itNotify->second.strFilter == strFilter) )
{
m_Notifications.erase(itNotify);
break;
}
}
}
protected:
struct notifyData
{
S32 nChannel;
std::string strFilter;
notifyData(S32 channel, const std::string& filter) : nChannel(channel), strFilter(filter) {}
};
std::multimap<LLUUID, notifyData> m_Notifications;
};
// ============================================================================
#endif // RLV_EVENTEMITTER_H
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