/*******************************************************************************
 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
 * in Industry THTH ry.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     VTT Technical Research Centre of Finland - initial API and implementation
 *******************************************************************************/
package org.simantics.db.common.request;

import org.simantics.db.AsyncReadGraph;
import org.simantics.db.ReadGraph;
import org.simantics.db.Resource;
import org.simantics.db.exception.DatabaseException;
import org.simantics.db.procedure.AsyncProcedure;
import org.simantics.layer0.Layer0;

public class PossibleTypedParent extends ResourceRead2<Resource> {

	public PossibleTypedParent(Resource resource, Resource type) {
		super(resource, type);
	}


	@Override
	public Resource perform(ReadGraph graph) throws DatabaseException {
		if(graph.isInstanceOf(resource, resource2)) {
			return resource;
		} else {
			Layer0 L0 = Layer0.getInstance(graph);
			Resource possibleParent = graph.getPossibleObject(resource, L0.PartOf);
			if(possibleParent != null) {
				return graph.syncRequest(new PossibleTypedParent(possibleParent, resource2));
			} else {
				return null;	
			}
		}
	}

//	@Override
//	public void perform(AsyncReadGraph graph, final AsyncProcedure<Resource> procedure) {
//
//	    final Layer0 l0 = graph.getService(Layer0.class);
//
//		graph.forIsInstanceOf(resource, resource2, new AsyncProcedure<Boolean>() {
//
//			@Override
//			public void execute(AsyncReadGraph graph, Boolean isInstance) {
//				if(isInstance) {
//					procedure.execute(graph, resource);
//				} else {
//					
//					graph.forPossibleObject(resource, l0.PartOf, new AsyncProcedure<Resource>() {
//
//						@Override
//						public void execute(AsyncReadGraph graph, final Resource parent) {
//
//							if(parent == null) {
//								procedure.execute(graph, null);
//							} else {
//								graph.asyncRequest(new PossibleTypedParent(parent, resource2), procedure);
//							}
//							
//						}
//
//						@Override
//						public void exception(AsyncReadGraph graph, Throwable throwable) {
//							procedure.exception(graph, throwable);
//						}
//						
//					});
//					
//				}
//			}
//
//			@Override
//			public void exception(AsyncReadGraph graph, Throwable throwable) {
//				procedure.exception(graph, throwable);
//			}
//		});
//		
//		
//	}

}