FileAccessor.h

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/*
 * FileAccessor.h
 *
 * Smalltalk like class library for C++
 * Accessor to file stored on disc. 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 __FILEACCESSOR_H
#define __FILEACCESSOR_H

#include <stlib/IOAccessor.h>
#include <stlib/LineEndConvention.h>

namespace Core {

class ByteArray;
class String;

class FileAccessor : public IOAccessor
{
  protected:
    String *name;
    int descriptor;

  public:
    FileAccessor(int fd);

    FileAccessor(String *pathname, int rwMode, int creationRule);

    FileAccessor(const char *pathname, int rwMode, int creationRule);

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

    /* Instance creation protocol */
    static FileAccessor *openFileReadOnly(String *pathname);
    static FileAccessor *openFileWriteOnly(String *pathname);

    /* Initialize-release protocol */
    virtual void close(void);

    /* Accessing protocol */
    virtual void commit(void);
    virtual long dataSize(void);
    virtual LineEndConvention lineEndConvention(void);

    /* Data transfer protocol */
    virtual int readInto(ByteArray *buffer)
      { return IOAccessor::readInto(buffer); }
    virtual int readInto(ByteArray *buffer, long startIndex, long count);

    virtual int writeFrom(ByteArray *buffer)
      { return IOAccessor::writeFrom(buffer); }
    virtual int writeFrom(ByteArray *buffer, long startIndex, long count);

    /* Positioning protocol */
    virtual void seekTo(long position);

    /* Stream redirection protocol */
    virtual void changeDescriptorTo(int fd);

    /* Testing protocol */
    virtual bool isSeekable(void);
};

};

#endif /* __FILEACCESSOR_H */

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