[LOGCXX-18] LoggerStream Feature

• Type: New Feature
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 0.10.0
• Fix Version/s: 0.10.0
• Environment: n/a
• Assignee: Curt Arnold
• Reporter: Christopher Smith
• Created: 06/Oct/04 18:18
• Updated: 13/Feb/08 18:50
• Resolved: 13/Feb/08 18:50

Description

A stream which provides a nice abstracted way to only do formatting when your current log level is enabled. See list archives for details.

#ifndef LOGGER_STREAM_HPP__INCLUDE
#define LOGGER_STREAM_HPP__INCLUDE

#include <log4cxx/logger.h>
#ifndef DISABLE_IOSTREAMS
#include <sstream>
#endif
#include <cassert>

template<typename B>
class LoggerStream {
public:
typedef enum

{ endl }

modifiers;
typedef B buffer_type;
typedef LoggerStream<buffer_type> self_type;

inline LoggerStream(log4cxx::LoggerPtr& aLogger,
const log4cxx::LevelPtr& aLevel,
const char* aFile = 0, int aLine = -1)
: logger(aLogger),
level(aLevel),
file(aFile),
line(aLine),
buffer((aLogger->isEnabledFor(aLevel)) ? (new buffer_type()) : 0) {
}

inline ~LoggerStream()

{ delete(buffer); //no need to check for null }

inline bool isEnabled() const

{ return buffer != 0; }

template<typename T>
inline LoggerStream& operator<<(const T& aValue) {
if (isEnabled())

{ (*buffer) << aValue; }

return *this;
}

inline LoggerStream& operator<<(const modifiers& aValue)

{ assert(aValue == endl); flush(); }

inline LoggerStream& flush() {
if (isEnabled())

{ logger->forcedLog(level, buffer->str().c_str(), file, line); }

return *this;
}

private:
log4cxx::LoggerPtr& logger;
const log4cxx::LevelPtr& level;
const char* file;
const int line;
buffer_type* const buffer;
};

//helpful macros that use STL IOSTREAMS
#define LOG_STREAM_EX(stream_type, logger, level) LoggerStream<stream_type>(logger, level, _FILE, __LINE_)
#define LOG_STREAM(logger, level) LOG_STREAM_EX(std::ostringstream, logger, level)
#define WLOG_STREAM(logger, level) LOG_STREAM_EX(std::wostringstream, logger, level)
#define ENDL LoggerStream<std::ostringstream>::endl
#define WENDL LoggerStream<std::wostringstream>::endl
#endif