/scr/tee1/isis/lib/Core/CoreUtils/message.hpp

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//
// C++ Interface: message
//
// Description:
//
//
// Author: Enrico Reimer<reimer@cbs.mpg.de>, (C) 2008
//
// Copyright: See COPYING file that comes with this distribution
//
//

#ifndef MESSAGE_H
#define MESSAGE_H

#include <sstream>
#include <string>
#include <ctime>
#include <list>
#include <iostream>
#define BOOST_FILESYSTEM_VERSION 2 //@todo switch to 3 as soon as we drop support for boost < 1.44
#include <boost/filesystem/path.hpp>
#include <boost/weak_ptr.hpp>
#include <boost/date_time/posix_time/posix_time_types.hpp>

namespace isis
{
enum LogLevel {error = 1, warning, notice, info, verbose_info};
namespace util
{

class MSubject : public std::string
{
public:
    template<typename T> MSubject( const T &cont ) {
        std::ostringstream text;
        text << cont;
        assign( text.str() );
    }
};

const char *logLevelName( LogLevel level );

template<class MODULE> class Log;
class Message;

class MessageHandlerBase
{
    static LogLevel m_stop_below;
protected:
    MessageHandlerBase( LogLevel level ): m_level( level ) {}
    virtual ~MessageHandlerBase() {}
public:
    LogLevel m_level;
    virtual void commit( const Message &msg ) = 0;
    static void stopBelow( LogLevel );
    bool requestStop( LogLevel _level );
};

class Message: public std::ostringstream
{
    boost::weak_ptr<MessageHandlerBase> commitTo;
public:
    std::string m_object, m_module;
    boost::filesystem::path m_file;
    std::list<std::string> m_subjects;
    boost::posix_time::ptime m_timeStamp;
    int m_line;
    LogLevel m_level;
    Message( std::string object, std::string module, std::string file, int line, LogLevel level, boost::weak_ptr<MessageHandlerBase> _commitTo );
    Message( const Message &src );
    ~Message();
    std::string merge()const;
    std::string strTime()const;
    template<typename T> Message &operator << ( T val ) {
        *( ( std::ostringstream * )this ) << val;
        return *this;
    }
    Message &operator << ( const MSubject &subj ) {
        m_subjects.push_back( subj );
        *( ( std::ostringstream * )this ) << "{s}";
        return *this;
    }
    bool shouldCommit()const;
};

class DefaultMsgPrint : public MessageHandlerBase
{
protected:
    static std::ostream *o;
    static const int max_age = 500;
    std::list<std::pair<boost::posix_time::ptime, std::string> > last;

public:
    DefaultMsgPrint( LogLevel level ): MessageHandlerBase( level ) {}
    virtual ~DefaultMsgPrint() {}
    void commit( const Message &mesg );
    static void setStream( std::ostream &_o );
};

}
}
#endif //MESSAGE_H