itextstream.h

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/*
 Copyright (C) 2001-2006, William Joseph.
 All Rights Reserved.

 This file is part of GtkRadiant.

 GtkRadiant 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 2 of the License, or
 (at your option) any later version.

 GtkRadiant 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 GtkRadiant; if not, write to the Free Software
 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#if !defined(INCLUDED_ITEXTSTREAM_H)
#define INCLUDED_ITEXTSTREAM_H


#include <cstddef>
#include "generic/static.h"

class TextInputStream
{
    public:
        virtual ~TextInputStream ()
        {
        }

        virtual std::size_t read (char* buffer, std::size_t length) = 0;
};

class TextOutputStream
{
    public:
        virtual ~TextOutputStream ()
        {
        }

        virtual std::size_t write (const char* buffer, std::size_t length) = 0;
};


template<typename T>
inline TextOutputStream& operator<< (TextOutputStream& ostream, const T& t)
{
    return ostream_write(ostream, t);
}

class NullOutputStream: public TextOutputStream
{
    public:
        std::size_t write (const char*, std::size_t length)
        {
            return length;
        }
};

class OutputStreamHolder
{
        NullOutputStream m_nullOutputStream;
        TextOutputStream* m_outputStream;
    public:
        OutputStreamHolder () :
            m_outputStream(&m_nullOutputStream)
        {
        }
        void setOutputStream (TextOutputStream& outputStream)
        {
            m_outputStream = &outputStream;
        }
        TextOutputStream& getOutputStream ()
        {
            return *m_outputStream;
        }
};

typedef Static<OutputStreamHolder> GlobalOutputStream;

inline TextOutputStream& globalOutputStream ()
{
    return GlobalOutputStream::instance().getOutputStream();
}

class ErrorStreamHolder: public OutputStreamHolder
{
};
typedef Static<ErrorStreamHolder> GlobalErrorStream;

inline TextOutputStream& globalErrorStream ()
{
    return GlobalErrorStream::instance().getOutputStream();
}

class WarningStreamHolder: public OutputStreamHolder
{
};
typedef Static<WarningStreamHolder> GlobalWarningStream;

inline TextOutputStream& globalWarningStream ()
{
    return GlobalWarningStream::instance().getOutputStream();
}

#endif