LoggerImpl.h

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/***************************************************************************
 *
 * Copyright (C) 2009-2011 Cassio Neri Moreira
 *
 * This file is part of the KeyValue library.
 *
 * The KeyValue library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as published
 * by the Free Software Foundation, either version 3 of the License, or (at
 * your option) any later version.
 *
 * The KeyValue library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
 * Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with KeyValue. If not, see <http://www.gnu.org/licenses/>.
 *
 * If you modify this library, or any covered work, by linking or combining
 * it with Excel (or a modified version of that program), containing parts
 * covered by the terms of End-User License Agreement for Microsoft
 * Software, the licensors of KeyValue grant you additional permission to
 * convey the resulting work.
 *
 **************************************************************************/

#ifndef KEYVALUE_SYS_LOGGER_LOGGERIMPL_H_
#define KEYVALUE_SYS_LOGGER_LOGGERIMPL_H_

#include "keyvalue/bridge/Bridge.h"
#include "keyvalue/sys/logger/Logger.h"
#include "keyvalue/sys/logger/policy/AddPrefix.h"
#include "keyvalue/sys/logger/policy/ForwardToGlobalLogger.h"
#include "keyvalue/sys/logger/policy/IgnoreColour.h"
#include "keyvalue/sys/message/MessageImpl.h"
#include "keyvalue/util/Global.h"

namespace keyvalue {
namespace logger {

template <typename PrefixPolicy = AddPrefix,
  typename ColourPolicy = IgnoreColour,
  typename SafetyPolicy = ForwardToGlobalLogger>

class LoggerImpl :

  public Logger,
  private PrefixPolicy,
  private ColourPolicy,
  private SafetyPolicy {

public:

  typedef LoggerImpl<PrefixPolicy, ColourPolicy, SafetyPolicy> LoggerImpl_;

  unsigned int
  getLevel() const;

  void
  setLevel(unsigned int level);

  bool
  log(const Message& message);

protected:

  LoggerImpl(unsigned int level);

  bool
  sendHeader();

private:

  unsigned int level_;

  bool
  process(const Message& message);

  virtual bool
  send(const string& message) = 0;

}; // class LoggerImpl

/*--------------------------------------------------------------------------
 * getLevel()
 *------------------------------------------------------------------------*/

template <typename PrefixPolicy, typename ColourPolicy,
  typename SafetyPolicy>
unsigned int
LoggerImpl<PrefixPolicy, ColourPolicy, SafetyPolicy>::getLevel() const {
  return level_;
}

/*--------------------------------------------------------------------------
 * setLevel()
 *------------------------------------------------------------------------*/

template <typename PrefixPolicy, typename ColourPolicy,
  typename SafetyPolicy>
void
LoggerImpl<PrefixPolicy, ColourPolicy, SafetyPolicy>::setLevel
  (const unsigned int level) {

  level_ = level;
}

/*--------------------------------------------------------------------------
 * log()
 *------------------------------------------------------------------------*/

template <typename PrefixPolicy, typename ColourPolicy,
  typename SafetyPolicy>
bool
LoggerImpl<PrefixPolicy, ColourPolicy, SafetyPolicy>::log
  (const Message& message) {

  if (!dynamic_cast<const Error *>(&message) && message.getLevel() >=level_)
    return true;
  return process(message);
}

/*--------------------------------------------------------------------------
 * LoggerImpl()
 *------------------------------------------------------------------------*/

template <typename PrefixPolicy, typename ColourPolicy,
  typename SafetyPolicy>
LoggerImpl<PrefixPolicy, ColourPolicy, SafetyPolicy>::LoggerImpl
  (const unsigned int level) : level_(level) {
}

/*--------------------------------------------------------------------------
 * sendHeader()
 *------------------------------------------------------------------------*/

template <typename PrefixPolicy, typename ColourPolicy,
  typename SafetyPolicy>
bool
LoggerImpl<PrefixPolicy, ColourPolicy, SafetyPolicy>::sendHeader() {
  return send(util::Global<Bridge>::get()->getCompleteInfo()) &&
    send("\n\n");
}

/*--------------------------------------------------------------------------
 * process()
 *------------------------------------------------------------------------*/

template <typename PrefixPolicy, typename ColourPolicy,
  typename SafetyPolicy>
bool
LoggerImpl<PrefixPolicy, ColourPolicy, SafetyPolicy>::process
  (const Message& message) {

  if (ColourPolicy::apply(message) && PrefixPolicy::apply(message) &&
    send(message.getString() + '\n'))
    return true;

  return SafetyPolicy::apply(this, message);
}

} // namespace logger
} // namespace keyvalue

#endif // KEYVALUE_SYS_LOGGER_LOGGERIMPL_H_