StringImpl.h

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/*
 * StringImpl.h
 *
 * Smalltalk like class library for C++
 * Abstract string implementor. Header.
 *
 * Copyright (c) 2004 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 __STRINGIMPL_H
#define __STRINGIMPL_H

#include <stlib/Object.h>

namespace Core {

class Character;
class ByteString;
class TwoByteString;
class CharacterArray;

class StringImpl : public Object
{
  protected:
    long tally;

  public:

    /* Accessing protocol */
    virtual Character *at(int index) const abstract;
    virtual void put(int index, Character *object) abstract;
    virtual int byteSize(void) abstract;
    virtual long size(void) const;

    /* Adding protocol */
    virtual void changeSize(long newSize) abstract;

    /* Comparing protocol */
    virtual bool isEqual(StringImpl *object) abstract;
    virtual bool isEqualToBytes(unsigned char *string) abstract;
    virtual bool isEqualToShorts(unsigned short *object) abstract;

    /* Converting protocol */
    virtual ByteString *asByteString(void);
    virtual TwoByteString *asTwoByteString(void);
    virtual CharacterArray *asCharacterArray(void);

    /* Testing protocol */
    virtual bool isByteString(void) const;
    virtual bool isTwoByteString(void) const;
    virtual bool isCharacterArray(void) const;
};

};

#endif /* __STRINGIMPL_H */

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