libassimp-dev 3.0~dfsg-3 / usr / include / assimp / DefaultLogger.hpp

/*
Open Asset Import Library (assimp)
----------------------------------------------------------------------

Copyright (c) 2006-2012, assimp team
All rights reserved.

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  copyright notice, this list of conditions and the
  following disclaimer.

* Redistributions in binary form must reproduce the above
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  following disclaimer in the documentation and/or other
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* Neither the name of the assimp team, nor the names of its
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  derived from this software without specific prior
  written permission of the assimp team.

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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
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*/
/** @file DefaultLogger.h
*/

#ifndef INCLUDED_AI_DEFAULTLOGGER
#define INCLUDED_AI_DEFAULTLOGGER

#include "Logger.hpp"
#include "LogStream.hpp"
#include "NullLogger.hpp"
#include <vector>

namespace Assimp	{
// ------------------------------------------------------------------------------------
class IOStream;
struct LogStreamInfo;

/** default name of logfile */
#define ASSIMP_DEFAULT_LOG_NAME "AssimpLog.txt"

// ------------------------------------------------------------------------------------
/** @brief CPP-API: Primary logging facility of Assimp. 
 *
 *  The library stores its primary #Logger as a static member of this class.
 *  #get() returns this primary logger. By default the underlying implementation is
 *  just a #NullLogger which rejects all log messages. By calling #create(), logging
 *  is turned on. To capture the log output multiple log streams (#LogStream) can be
 *  attach to the logger. Some default streams for common streaming locations (such as
 *  a file, std::cout, OutputDebugString()) are also provided.
 *  
 *  If you wish to customize the logging at an even deeper level supply your own
 *  implementation of #Logger to #set().
 *  @note The whole logging stuff causes a small extra overhead for all imports. */
class ASSIMP_API DefaultLogger :
	public Logger	{

public:

	// ----------------------------------------------------------------------
	/** @brief Creates a logging instance.
	 *  @param name Name for log file. Only valid in combination
	 *    with the aiDefaultLogStream_FILE flag. 
	 *  @param severity	Log severity, VERBOSE turns on debug messages
	 *  @param defStreams  Default log streams to be attached. Any bitwise
	 *    combination of the aiDefaultLogStream enumerated values. 
	 *    If #aiDefaultLogStream_FILE is specified but an empty string is
	 *    passed for 'name', no log file is created at all.
	 *  @param  io IOSystem to be used to open external files (such as the 
	 *   log file). Pass NULL to rely on the default implementation.
	 *  This replaces the default #NullLogger with a #DefaultLogger instance. */
	static Logger *create(const char* name = ASSIMP_DEFAULT_LOG_NAME,
		LogSeverity severity    = NORMAL,
		unsigned int defStreams = aiDefaultLogStream_DEBUGGER | aiDefaultLogStream_FILE,
		IOSystem* io		    = NULL);

	// ----------------------------------------------------------------------
	/** @brief Setup a custom #Logger implementation.
	 *
	 *  Use this if the provided #DefaultLogger class doesn't fit into
	 *  your needs. If the provided message formatting is OK for you,
	 *  it's much easier to use #create() and to attach your own custom 
	 *  output streams to it.
	 *  @param logger Pass NULL to setup a default NullLogger*/
	static void set (Logger *logger);
	
	// ----------------------------------------------------------------------
	/** @brief	Getter for singleton instance
	 *	 @return Only instance. This is never null, but it could be a 
	 *  NullLogger. Use isNullLogger to check this.*/
	static Logger *get();

	// ----------------------------------------------------------------------
	/** @brief  Return whether a #NullLogger is currently active
	 *  @return true if the current logger is a #NullLogger.
	 *  Use create() or set() to setup a logger that does actually do
	 *  something else than just rejecting all log messages. */
	static bool isNullLogger();
	
	// ----------------------------------------------------------------------
	/** @brief	Kills the current singleton logger and replaces it with a
	 *  #NullLogger instance. */
	static void kill();
	
	// ----------------------------------------------------------------------
	/**	@copydoc Logger::attachStream   */
	bool attachStream(LogStream *pStream,
		unsigned int severity);

	// ----------------------------------------------------------------------
	/**	@copydoc Logger::detatchStream */
	bool detatchStream(LogStream *pStream, 
		unsigned int severity);


private:

	// ----------------------------------------------------------------------
	/** @briefPrivate construction for internal use by create().
	 *  @param severity Logging granularity  */
	DefaultLogger(LogSeverity severity);
	
	// ----------------------------------------------------------------------
	/**	@briefDestructor	*/
	~DefaultLogger();

private:

	/**	@brief	Logs debug infos, only been written when severity level VERBOSE is set */
	void OnDebug(const char* message);

	/**	@brief	Logs an info message */
	void OnInfo(const char*  message);

	/**	@brief	Logs a warning message */
	void OnWarn(const char*  message);
	
	/**	@brief	Logs an error message */
	void OnError(const char* message);

	// ----------------------------------------------------------------------
	/**	@brief Writes a message to all streams */
	void WriteToStreams(const char* message, ErrorSeverity ErrorSev );

	// ----------------------------------------------------------------------
	/** @brief Returns the thread id.
	 *	@note This is an OS specific feature, if not supported, a 
	 *    zero will be returned.
	 */
	unsigned int GetThreadID();

private:
	//	Aliases for stream container
	typedef std::vector<LogStreamInfo*>	StreamArray;
	typedef std::vector<LogStreamInfo*>::iterator StreamIt;
	typedef std::vector<LogStreamInfo*>::const_iterator ConstStreamIt;

	//!	only logging instance
	static Logger *m_pLogger;
	static NullLogger s_pNullLogger;

	//!	Attached streams
	StreamArray	m_StreamArray;

	bool noRepeatMsg;
	char lastMsg[MAX_LOG_MESSAGE_LENGTH*2];
	size_t lastLen;
};
// ------------------------------------------------------------------------------------

} // Namespace Assimp

#endif // !! INCLUDED_AI_DEFAULTLOGGER