Association.h

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/*
 * Association.h
 *
 * Smalltalk like class library for C++
 * Relation between two objects. 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 __ASSOCIATION_H
#define __ASSOCIATION_H

#include <stlib/Object.h>

namespace Core {

class String;
class Stream;
class Visitor;

class Association : public Object
{
  protected:
    Object *_key;            
    Object *_value;          
  public:
    Association(Object *key, Object *value);
    
    /* Class-accessing protocol */
    virtual String *className(void) const;

    /* Copying protocol */
    Association(const Association &origin);

    /* Accessing protocol */
    virtual Object *key(void);
    virtual void key(Object *);
    virtual Object *value(void);
    virtual void value(Object *);

    /* Comparing protocol */
    virtual long hash(void) const;
    virtual bool isEqual(const Object *object) const;

    /* Copying protocol */
    virtual Object *copy(void);

    /* Printing protocol */
    virtual void printOn(Stream *stream) const;

    /* Testing protocol */
    virtual bool isAssociation(void) const;

    /* Visiting protocol */
    virtual void visitBy(Visitor *visitor);
};

};

#endif /* __ASSOCIATION_H */

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