Imported existing code

indra/llcommon/lleventemitter.h

@@ -0,0 +1,108 @@
+/** 
+ * @file lleventemitter.h
+ * @brief General event emitter class
+ *
+ * $LicenseInfo:firstyear=2005&license=viewergpl$
+ * 
+ * Copyright (c) 2005-2009, Linden Research, Inc.
+ * 
+ * Second Life Viewer Source Code
+ * The source code in this file ("Source Code") is provided by Linden Lab
+ * to you under the terms of the GNU General Public License, version 2.0
+ * ("GPL"), unless you have obtained a separate licensing agreement
+ * ("Other License"), formally executed by you and Linden Lab.  Terms of
+ * the GPL can be found in doc/GPL-license.txt in this distribution, or
+ * online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
+ * 
+ * There are special exceptions to the terms and conditions of the GPL as
+ * it is applied to this Source Code. View the full text of the exception
+ * in the file doc/FLOSS-exception.txt in this software distribution, or
+ * online at
+ * http://secondlifegrid.net/programs/open_source/licensing/flossexception
+ * 
+ * By copying, modifying or distributing this software, you acknowledge
+ * that you have read and understood your obligations described above,
+ * and agree to abide by those obligations.
+ * 
+ * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
+ * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
+ * COMPLETENESS OR PERFORMANCE.
+ * $/LicenseInfo$
+ */
+
+// header guard
+#ifndef LL_EVENTEMITTER_H
+#define LL_EVENTEMITTER_H
+
+// standard headers
+#include <algorithm>
+#include <typeinfo>
+#include <iostream>
+#include <string>
+#include <list>
+
+#include "stdtypes.h"
+
+///////////////////////////////////////////////////////////////////////////////
+//	templatized emitter class
+template < class T >
+class eventEmitter
+{
+	public:
+		typedef typename T::EventType EventType;
+		typedef std::list< T* > ObserverContainer;
+		typedef void ( T::*observerMethod )( const EventType& );
+
+	protected:
+		ObserverContainer observers;
+
+	public:
+		eventEmitter () { };
+
+		~eventEmitter () { };
+
+		///////////////////////////////////////////////////////////////////////////////
+		//
+		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 update ( observerMethod method, const EventType& msgIn )
+		{
+			typename std::list< T* >::iterator iter = observers.begin ();
+
+			while ( iter != observers.end () )
+			{
+				( ( *iter )->*method ) ( msgIn );
+
+				++iter;
+			};
+		};
+};
+
+#endif // lleventemitter_h