/*******************************************************************************
 * 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.primitiverequest;

import org.simantics.db.AsyncReadGraph;
import org.simantics.db.Resource;
import org.simantics.db.common.procedure.adapter.AsyncProcedureDelegate;
import org.simantics.db.common.procedure.guarded.GuardedAsyncMultiProcedure;
import org.simantics.db.common.request.ResourceAsyncMultiRead2;
import org.simantics.db.procedure.AsyncMultiProcedure;

final public class ForEachPredicateBasedOn extends ResourceAsyncMultiRead2<Resource> {

    public ForEachPredicateBasedOn(Resource resource, Resource superRelation) {
        super(resource, superRelation);
    }

	@Override
	public void perform(AsyncReadGraph graph, AsyncMultiProcedure<Resource> procedure) {
		
		graph.forEachPredicate(resource, new GuardedAsyncMultiProcedure<Resource>(procedure) {

			@Override
			public void execute(AsyncReadGraph graph, final Resource predicate) {
				
				inc();
				
				graph.forIsSubrelationOf(predicate, resource2, new AsyncProcedureDelegate<Boolean>(this) {

					@Override
					public void execute(AsyncReadGraph graph, Boolean isSubrelation) {
						if(isSubrelation) {
							offer(graph, predicate);
						}
						dec(graph);
					}
					
				});
				
			}
    		
    	});
		
	}

}