include/assimp/Logger.hpp

/*
Open Asset Import Library (assimp)
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* Redistributions in binary form must reproduce the above
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*/

/** @file Logger.hpp
 *  @brief Abstract base class 'Logger', base of the logging system.
 */
#ifndef INCLUDED_AI_LOGGER_H
#define INCLUDED_AI_LOGGER_H

#include "types.h"
namespace Assimp    {
class LogStream;

// Maximum length of a log message. Longer messages are rejected.
#define MAX_LOG_MESSAGE_LENGTH 1024u

// ----------------------------------------------------------------------------------
/** @brief CPP-API: Abstract interface for logger implementations.
 *  Assimp provides a default implementation and uses it for almost all
 *  logging stuff ('DefaultLogger'). This class defines just basic logging
 *  behaviour and is not of interest for you. Instead, take a look at #DefaultLogger. */
class ASSIMP_API Logger
#ifndef SWIG
    : public Intern::AllocateFromAssimpHeap
#endif
{
public:

    // ----------------------------------------------------------------------
    /** @enum   LogSeverity
     *  @brief  Log severity to describe the granularity of logging.
     */
    enum LogSeverity
    {
        NORMAL,     //!< Normal granularity of logging
        VERBOSE     //!< Debug infos will be logged, too
    };

    // ----------------------------------------------------------------------
    /** @enum   ErrorSeverity
     *  @brief  Description for severity of a log message.
     *
     *  Every LogStream has a bitwise combination of these flags.
     *  A LogStream doesn't receive any messages of a specific type
     *  if it doesn't specify the corresponding ErrorSeverity flag.
     */
    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*/
    void debug(const char* message);
    inline void debug(const std::string &message);

    // ----------------------------------------------------------------------
    /** @brief  Writes a info message
     *  @param  message Info message*/
    void info(const char* message);
    inline void info(const std::string &message);

    // ----------------------------------------------------------------------
    /** @brief  Writes a warning message
     *  @param  message Warn message*/
    void warn(const char* message);
    inline void warn(const std::string &message);

    // ----------------------------------------------------------------------
    /** @brief  Writes an error message
     *  @param  message Error message*/
    void error(const char* message);
    inline void error(const std::string &message);

    // ----------------------------------------------------------------------
    /** @brief  Set a new log severity.
     *  @param  log_severity New severity for logging*/
    void setLogSeverity(LogSeverity log_severity);

    // ----------------------------------------------------------------------
    /** @brief Get the current log severity*/
    LogSeverity getLogSeverity() const;

    // ----------------------------------------------------------------------
    /** @brief  Attach a new log-stream
     *
     *  The logger takes ownership of the stream and is responsible
     *  for its destruction (which is done using ::delete when the logger
     *  itself is destroyed). Call detachStream to detach a stream and to
     *  gain ownership of it again.
     *   @param pStream  Log-stream to attach
     *  @param severity  Message filter, specified which types of log
     *    messages are dispatched to the stream. Provide a bitwise
     *    combination of the ErrorSeverity flags.
     *  @return true if the stream has been attached, false otherwise.*/
    virtual bool attachStream(LogStream *pStream,
        unsigned int severity = Debugging | Err | Warn | Info) = 0;

    // ----------------------------------------------------------------------
    /** @brief  Detach a still attached stream from the logger (or
     *          modify the filter flags bits)
     *   @param pStream Log-stream instance for detaching
     *  @param severity Provide a bitwise combination of the ErrorSeverity
     *    flags. This value is &~ed with the current flags of the stream,
     *    if the result is 0 the stream is detached from the Logger and
     *    the caller retakes the possession of the stream.
     *  @return true if the stream has been detached, false otherwise.*/
    virtual bool detatchStream(LogStream *pStream,
        unsigned int severity = Debugging | Err | Warn | Info) = 0;

protected:

    /** Default constructor */
    Logger();

    /** Construction with a given log severity */
    explicit Logger(LogSeverity severity);

    // ----------------------------------------------------------------------
    /** @brief Called as a request to write a specific debug message
     *  @param  message Debug message. Never longer than
     *    MAX_LOG_MESSAGE_LENGTH characters (excluding the '0').
     *  @note  The message string is only valid until the scope of
     *    the function is left.
     */
    virtual void OnDebug(const char* message)= 0;

    // ----------------------------------------------------------------------
    /** @brief Called as a request to write a specific info message
     *  @param  message Info message. Never longer than
     *    MAX_LOG_MESSAGE_LENGTH characters (ecxluding the '0').
     *  @note  The message string is only valid until the scope of
     *    the function is left.
     */
    virtual void OnInfo(const char* message) = 0;

    // ----------------------------------------------------------------------
    /** @brief Called as a request to write a specific warn message
     *  @param  message Warn message. Never longer than
     *    MAX_LOG_MESSAGE_LENGTH characters (exluding the '0').
     *  @note  The message string is only valid until the scope of
     *    the function is left.
     */
    virtual void OnWarn(const char* essage) = 0;

    // ----------------------------------------------------------------------
    /** @brief Called as a request to write a specific error message
     *  @param  message Error message. Never longer than
     *    MAX_LOG_MESSAGE_LENGTH characters (exluding the '0').
     *  @note  The message string is only valid until the scope of
     *    the function is left.
     */
    virtual void OnError(const char* message) = 0;

protected:

    //! Logger severity
    LogSeverity m_Severity;
};

// ----------------------------------------------------------------------------------
//  Default constructor
inline Logger::Logger() {
    setLogSeverity(NORMAL);
}

// ----------------------------------------------------------------------------------
//  Virtual destructor
inline  Logger::~Logger()
{
}

// ----------------------------------------------------------------------------------
// Construction with given logging severity
inline Logger::Logger(LogSeverity severity) {
    setLogSeverity(severity);
}

// ----------------------------------------------------------------------------------
// Log severity setter
inline void Logger::setLogSeverity(LogSeverity log_severity){
    m_Severity = log_severity;
}

// ----------------------------------------------------------------------------------
// Log severity getter
inline Logger::LogSeverity Logger::getLogSeverity() const {
    return m_Severity;
}

// ----------------------------------------------------------------------------------
inline void Logger::debug(const std::string &message)
{
    return debug(message.c_str());
}

// ----------------------------------------------------------------------------------
inline void Logger::error(const std::string &message)
{
    return error(message.c_str());
}

// ----------------------------------------------------------------------------------
inline void Logger::warn(const std::string &message)
{
    return warn(message.c_str());
}

// ----------------------------------------------------------------------------------
inline void Logger::info(const std::string &message)
{
    return info(message.c_str());
}

// ----------------------------------------------------------------------------------

} // Namespace Assimp

#endif // !! INCLUDED_AI_LOGGER_H