Adding new SimpleLogger class

Util/SimpleLogger.h

@@ -0,0 +1,110 @@
+/*
+    open source routing machine
+    Copyright (C) Dennis Luxen, 2010
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU AFFERO General Public License as published by
+the Free Software Foundation; either version 3 of the License, or
+any later version.
+
+This program 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 Affero General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+or see http://www.gnu.org/licenses/agpl.txt.
+ */
+
+
+#ifndef SIMPLE_LOGGER_H_
+#define SIMPLE_LOGGER_H_
+
+#include <boost/assert.hpp>
+#include <boost/noncopyable.hpp>
+#include <boost/thread/mutex.hpp>
+
+#include <ostream>
+#include <iostream>
+
+enum LogLevel { logINFO, logWARNING, logDEBUG };
+static	boost::mutex logger_mutex;
+
+class LogPolicy : boost::noncopyable {
+public:
+
+	void Unmute() {
+		m_is_mute = false;
+	}
+
+	void Mute() {
+		m_is_mute = true;
+	}
+
+	bool IsMute() const {
+		return m_is_mute;
+	}
+
+    static LogPolicy & GetInstance() {
+	    static LogPolicy runningInstance;
+    	return runningInstance;
+    }
+
+private:
+	LogPolicy() : m_is_mute(true) { }
+	bool m_is_mute;
+};
+
+class SimpleLogger {
+public:
+    std::ostringstream& Write(LogLevel l = logINFO) {
+		boost::mutex::scoped_lock lock(logger_mutex);
+		level = l;
+    	os << "[";
+   	   	switch(level) {
+    		case logINFO:
+	    		os << "info";
+	    		break;
+    		case logWARNING:
+	    		os << "warn";
+	    		break;
+    		case logDEBUG:
+	    		os << "debug";
+	    		break;
+    		default:
+	    		BOOST_ASSERT_MSG(false, "should not happen");
+	    		break;
+    	}
+		os << "] ";
+	   	return os;
+   }
+
+	virtual ~SimpleLogger() {
+		   	if(!LogPolicy::GetInstance().IsMute()) {
+			os << std::endl;
+		   	switch(level) {
+				case logINFO:
+					std::cout << os.str();
+					break;
+				case logWARNING:
+					std::cerr << os.str();
+					break;
+				case logDEBUG:
+					std::cout << os.str();
+					break;
+				default:
+					BOOST_ASSERT_MSG(false, "should not happen");
+					break;
+			}
+	   	}
+	}
+
+private:
+	LogLevel level;
+	std::ostringstream os;
+	bool m_is_mute;
+};
+
+#endif /* SIMPLE_LOGGER_H_ */