/*
 Wotonomy: OpenStep design patterns for pure Java applications.
 Copyright (C) 2000 Blacksmith, Inc.

 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, see http://www.gnu.org
 */

package net.wotonomy.web;

import net.wotonomy.foundation.NSDictionary;
import net.wotonomy.foundation.NSMutableDictionary;

public class WOSwitchComponent extends WODynamicElement {

    private NSMutableDictionary elements;
    private String currentName;
    private WOElement currentElement;

    protected WOSwitchComponent() 
    {
        super();
        elements = new NSMutableDictionary();
    }

    public WOSwitchComponent(String aName, NSDictionary aMap, WOElement template) 
    {
        super(aName, aMap, template);
        elements = new NSMutableDictionary();
    }
    
    private WOElement getCurrentElement( WOContext c )
    {
        String name = stringForProperty( "WOComponentName", c.component() );
        if ( name == null ) return null;
        
        if ( currentElement != null && name.equals( currentName ) ) return currentElement;
        
        currentName = name;
        currentElement = (WOElement) elements.objectForKey( name );
        if ( currentElement == null )
        {
            currentElement = WOApplication.application().pageWithName( name, c );
            if ( currentElement != null )
            {
                currentElement.associations = associations;
                elements.setObjectForKey( currentElement, name );
            }
        }
        
        return currentElement;
    }

    void ensureAwakeInContext (WOContext aContext)
    {
        if ( aContext != null )
        {
            WOElement element = getCurrentElement( aContext );
            if ( element != null )
            {
                aContext.pushElement( element );
                element.ensureAwakeInContext( aContext );
                aContext.popElement();
            }
        }
    }

    public void takeValuesFromRequest(WORequest r, WOContext c) 
    {
        WOElement element = getCurrentElement( c );
        if ( element != null )
        {
            c.pushElement( element );
            element.takeValuesFromRequest( r, c );
            c.popElement();
        }
    }

    public WOActionResults invokeAction(WORequest r, WOContext c) 
    {
        WOActionResults result = null;
        WOElement element = getCurrentElement( c );
        if ( element != null )
        {
            c.pushElement( element );
            result = element.invokeAction( r, c );
            c.popElement();
        }
        return result;
    }

    public void appendToResponse(WOResponse r, WOContext c) 
    {
        WOElement element = getCurrentElement( c );
        if ( element != null )
        {
            c.pushElement( element );
            element.appendToResponse( r, c );
            c.popElement();
        }
    }
}