LogMessageBase.h

// This file is a part of the OpenSurgSim project.
// Copyright 2013, SimQuest Solutions Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#ifndef SURGSIM_FRAMEWORK_LOGMESSAGEBASE_H
#define SURGSIM_FRAMEWORK_LOGMESSAGEBASE_H

#include <string>
#include <sstream>
#include <iomanip>
#include <ctime>

#include "SurgSim/Framework/Logger.h"

namespace SurgSim
{
namespace Framework
{



class LogMessageBase
{
public:

    LogMessageBase(Logger* logger, int level);

    ~LogMessageBase()
    {
    }

    template <typename T>
    LogMessageBase& operator <<(T&& input)
    {
        m_stream << input;
        return *this;
    }

    // A specialization for output manipulators (functions that apply to the stream).
    // Otherwise overloaded manipulators like std::endl and std::endl don't work, since the compiler can't know
    // what overloaded variant to apply.
    LogMessageBase& operator <<(std::ios_base& (*manipulator)(std::ios_base&))
    {
        m_stream << *manipulator;
        return *this;
    }

    // A specialization for output manipulators (functions that apply to the stream).
    // Otherwise overloaded manipulators like std::hex and std::endl don't work, since the compiler can't know
    // what overloaded variant to apply.
    LogMessageBase& operator <<(std::ostream& (*manipulator)(std::ostream&))
    {
        m_stream << *manipulator;
        return *this;
    }

protected:
    std::string getMessage()
    {
        return m_stream.str();
    }

    void flush()
    {
        m_logger->writeMessage(m_stream.str());
    }

private:
    std::ostringstream m_stream;
    Logger* m_logger;
};



}; // namespace Framework
}; // namespace SurgSim

#endif  // SURGSIM_FRAMEWORK_LOGMESSAGEBASE_H