Object.cc

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/*
 * Object.cc
 *
 * Smalltalk like class library for C++
 * Base class.
 *
 * 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
 */
#include <stlib/Object.h>
#include <stlib/Character.h>
#include <stlib/Collection.h>
#include <stlib/String.h>
#include <stlib/Stream.h>
#include <stlib/Visitor.h>
#include <stlib/WriteStream.h>

#include <stlib/Error.h>
#include <stlib/NotFoundError.h>

#include <stdio.h>

static long objectCounter = 0;

Object::Object(void)
{
    oid = objectCounter++;
#if defined(DEBUG) && defined(VERBOSE)
    fprintf(stderr, "%ld created (%p)\n", oid, this);
#endif
}

Object::~Object(void)
{
#if defined(DEBUG) && defined(VERBOSE)
    fprintf(stderr, "%ld destroyed (%p)\n", oid, this);
#endif
}

/* Class-accessing protocol */
String *Object::className(void) const
{
    return new String("Object");
}

/* Error handling protocol */
void Object::error(String *message, String *selector, Object *parameter)
{
    Error *ex = new Error(message, selector, parameter);
    ex->raiseFrom(this);
}

void Object::shouldNotImplement(String *selector)
{
    error(new String("Message is not appropriate for this object"), selector);
}

void Object::shouldNotImplement(const char *selector)
{
    shouldNotImplement(new String(selector));
}

/* Comparing protocol */
long Object::hash(void) const
{
    return (long) this;
}

bool Object::isEqual(const Object *object) const
{
    return isIdentical(object);
}

bool Object::isEqual(const Object &object) const
{
    return isEqual(&object);
}

bool Object::isEqualToByteArray(const Object *object) const
{
    return false;
}

bool Object::operator==(const Object &object) const
{
    return isEqual(&object);
}

bool Object::isIdentical(const Object *object) const
{
    return this == object;
}

bool Object::isIdentical(const Object &object) const
{
    return isIdentical(&object);
}

/* Printing protocol */
void Object::printOn(Stream *stream) const
{
    String *title = className();   // self class printString
    if (((Character *) title->first())->isVowel())
        stream->nextPutAll("an ");
    else stream->nextPutAll("a ");
    stream->nextPutAll(title);
}

String *Object::printString(void) const
{
    WriteStream stream(new String(16));
    printOn(&stream);
    return (String *) stream.contents();
}

/* Testing protocol */
bool Object::isAssociation(void) const
{
    return false;
}

bool Object::isBoolean(void) const
{
    return false;
}

bool Object::isCharacter(void) const
{
    return false;
}

bool Object::isNumber(void) const
{
    return false;
}

bool Object::isString(void) const
{
    return false;
}

bool Object::isInstanceOf(String *className)
{
    return(className->isEqual(this->className()));
}

bool Object::isInstanceOf(const char* className)
{
    return(this->isInstanceOf(new String(className)));
}

/* Visiting protocol */
void Object::visitBy(Visitor *visitor)
{
    visitor->visitObject(this);
}

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