/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/

#include "widgetfactory.h"
#include "widgetfactory.moc"
#include "widgetset.h"
#include "diagramwidget.h"

#include <kdebug.h>

namespace Umbrello{

    WidgetFactory* WidgetFactory::instance()
    {
	if( !s_instance )
            s_instance = new WidgetFactory();
	return s_instance;
    }

    WidgetFactory::WidgetFactory()
    {
    }

    WidgetFactory::~WidgetFactory()
    {
    }

    void WidgetFactory::registerWidgetSet( WidgetSet *set )
    {
 	kdDebug()<<"WidgetFactory: Appending widget set "<<set->instanceName()<<" to list of known sets"<<endl;
 	widgetSets.append( set );
    }

    void WidgetFactory::removeWidgetSet( WidgetSet *set )
    {
 	kdDebug()<<"WidgetFactory: Removing widget set "<<set->instanceName()<<" from list of known sets"<<endl;
 	widgetSets.remove( set );
    }

    void WidgetFactory::setDefaultWidgetSet( WidgetSet *set )
    {
 	kdDebug()<<"WidgetFactory: setting "<<(set? (const char*)set->instanceName() : "null")<<" as default widget set"<<endl;
	m_defaultSet = set;
    }

    bool WidgetFactory::canCreateWidget( UMLObject *obj )
    {
	for( WidgetSetList::Iterator it = widgetSets.begin(); it != widgetSets.end(); ++it )
	{
            if((*it)->canCreateWidget( obj ))
            {
                return true;
            }
	}
	if( m_defaultSet && m_defaultSet->canCreateWidget( obj ) )
	{
            return true;
	}
	return false;
    }
    DiagramWidget* WidgetFactory::createWidget( UMLObject *obj, Diagram *diagram )
    {
	DiagramWidget *w(0);
	for( WidgetSetList::Iterator it = widgetSets.begin(); it != widgetSets.end(); ++it )
	{
            if((*it)->canCreateWidget( obj ))
            {
                w = (*it)->createWidget( obj, diagram );
                return w;
            }
	}
	if( m_defaultSet && m_defaultSet->canCreateWidget( obj ) )
	{
            w = m_defaultSet->createWidget(obj, diagram);
            return w;
	}

	kdWarning()<<"WidgetFactory::createWidget:"<<obj<<" not provided by any widget set"<<endl;
	return w;
    }

    WidgetFactory* WidgetFactory::s_instance = 0L;
}

