package org.simantics.district.network.ui.techtype.requests;

import java.util.Collection;

import org.simantics.db.ReadGraph;
import org.simantics.db.Resource;
import org.simantics.db.common.request.ResourceRead2;
import org.simantics.db.exception.DatabaseException;
import org.simantics.district.network.ontology.DistrictNetworkResource;
import org.simantics.layer0.Layer0;

public class PossibleTechTypeTable extends ResourceRead2<Resource> {
	public PossibleTechTypeTable(Resource model, Resource componentType) {
		super(model, componentType);
	}

	@Override
	public Resource perform(ReadGraph graph) throws DatabaseException {
		Layer0 L0 = Layer0.getInstance(graph);
		DistrictNetworkResource DN = DistrictNetworkResource.getInstance(graph);
		
		Collection<Resource> children = graph.getObjects(resource, L0.ConsistsOf);
		for (Resource child : children) {
			if (!graph.isInstanceOf(child, DN.TechType_TechTypeTable))
				continue;
			
			if (graph.hasStatement(child, DN.TechType_TechTypeTable_HasComponentType, resource2))
				return child;
		}
		
		return null;
	}
}