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

import org.simantics.db.ReadGraph;
import org.simantics.db.Resource;
import org.simantics.db.common.procedure.adapter.TransientCacheListener;
import org.simantics.db.common.request.ResourceRead;
import org.simantics.db.exception.DatabaseException;
import org.simantics.district.network.ontology.DistrictNetworkResource;

public class TechTypeTableKeyName extends ResourceRead<String> {
	
	public TechTypeTableKeyName(Resource table) {
		super(table);
	}

	@Override
	public String perform(ReadGraph graph) throws DatabaseException {
		DistrictNetworkResource DN = DistrictNetworkResource.getInstance(graph);
		
		Resource type = graph.getPossibleObject(resource, DN.TechType_TechTypeTable_HasComponentType);
		return type != null ? graph.syncRequest(new PossibleTechTypeKeyName(type), TransientCacheListener.instance()) : null;
	}
}