FEATURE: Add interfaces for logger and logstream

git-svn-id: https://assimp.svn.sourceforge.net/svnroot/assimp/trunk@2 67173fc5-114c-0410-ac8e-9d2fd5bffc1f

include/LogStream.h

@@ -0,0 +1,42 @@
+#ifndef AI_LOGSTREAM_H_INC
+#define AI_LOGSTREAM_H_INC
+
+namespace Assimp
+{
+// ---------------------------------------------------------------------------
+/**	@class	LogStream
+	 *	@brief	Abstract interface for log stream implementations.
+ */
+class LogStream
+{
+protected:
+	/**	@brief	Default constructor	*/
+	LogStream();
+
+public:
+	/**	@brief	Virtual destructor	*/
+	virtual ~LogStream();
+
+	/**	@brief	Overwrite this for your own output methods	*/
+	virtual void write(const std::string &message) = 0;
+};
+
+// ---------------------------------------------------------------------------
+//	Default constructor
+inline LogStream::LogStream()
+{
+	// empty
+}
+
+// ---------------------------------------------------------------------------
+//	Virtual destructor
+inline LogStream::~LogStream()
+{
+	// empty
+}
+
+// ---------------------------------------------------------------------------
+
+} // Namespace Assimp
+
+#endif

include/Logger.h

@@ -0,0 +1,98 @@
+#ifndef AI_LOGGER_H_INC
+#define AI_LOGGER_H_INC
+
+#include <string>
+
+namespace Assimp
+{
+
+class LogStream;
+
+// ---------------------------------------------------------------------------
+/**	@class	Logger
+ *	@brief	Abstract interface for logger implementations.
+ */
+class Logger
+{
+public:
+	/**	@enum	LogSeverity
+	 *	@brief	Log severity to descripe granuality of logging.
+	 */
+	enum LogSeverity
+	{
+		NORMAL,		//!< Normal granlality of logging
+		VERBOSE		//!< Debug infos will be logged, too
+	};
+
+	/**	@enum	ErrorSeverity
+	 *	@brief	Description for severity of a log message
+	 */
+	enum ErrorSeverity
+	{
+		DEBUGGING	= 1,	//!< Debug log message
+		INFO		= 2, 	//!< Info log message
+		WARN		= 4,	//!< Warn log message
+		ERR			= 8		//!< Error log message
+	};
+
+public:
+	/**	@brief	Virtual destructor */
+	virtual ~Logger();
+
+	/**	@brief	Writes a debug message
+	 *	@param	message		Debug message
+	 */
+	virtual void debug(const std::string &message)= 0;
+
+	/**	@brief	Writes a info message
+	 *	@param	message		Info message
+	 */
+	virtual void info(const std::string &message) = 0;
+
+	/**	@brief	Writes a warning message
+	 *	@param	message		Warn message
+	 */
+	virtual void warn(const std::string &message) = 0;
+
+	/**	@brief	Writes an error message
+	 *	@param	message		Error message
+	 */
+	virtual void error(const std::string &message) = 0;
+
+	/**	@brief	Set a new log severity.
+	 *	@param	log_severity	New severity for logging
+	 */
+	virtual void setLogSeverity(LogSeverity log_severity) = 0;
+
+	/**	@brief	Attach a new logstream
+	 *	@param	pStream		Logstream to attach
+	 */
+	virtual void attachStream(LogStream *pStream, unsigned int severity) = 0;
+
+	/**	@brief	Detach a still attached stream from logger
+	 *	@param	pStream		Logstream instance for detatching
+	 */
+	virtual void detatchStream(LogStream *pStream, unsigned int severity) = 0;
+
+protected:
+	/**	@brief	Default constructor	*/
+	Logger();
+};
+// ---------------------------------------------------------------------------
+//	Default constructor
+inline Logger::Logger()
+{
+	//	empty
+}
+
+// ---------------------------------------------------------------------------
+//	Virtual destructor
+inline  Logger::~Logger()
+{
+	// empty
+}
+// ---------------------------------------------------------------------------
+
+} // Namespace Assimp
+
+#endif