ExternalStream.h

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/*
 * ExternalStream.h
 *
 * Smalltalk like class library for C++
 * Abstract external stream. Header.
 *
 * Copyright (c) 2003 Milan Cermak
 */
/*
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
#ifndef __EXTERNALSTREAM_H
#define __EXTERNALSTREAM_H

#include <stlib/PositionableStream.h>

namespace Core {

class Collection;
class Character;
class IOAccessor;
class IOBuffer;
class SequenceableCollection;
class String;

class ExternalStream : public PositionableStream
{
  protected:
    IOAccessor *io_accessor;
    IOBuffer *io_buffer;

  public:
    ExternalStream(IOAccessor *accessor);

    /* Class-accessing protocol */
    virtual String *className(void) const;

    /* Accessing protocol */
    virtual SequenceableCollection *contents(void);

    /* Positioning protocol */
    virtual long readPosition(void);

    /* Status protocol */
    virtual void close(void);
    virtual bool closed(void);
    virtual void commit(void);

    /* Testing protocol */
    virtual bool atEnd(void);
    virtual bool isBinary(void);
    virtual bool isExternalStream(void);

    /* Private protocol */
    virtual void closeConnection(void);
    virtual bool nextBuffer(void);
    virtual Object *pastEnd(void);
    virtual void setPosition(long position);
};

};

#endif /* __EXTERNALSTREAM_H */

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