/*******************************************************************************
 * 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 java.util.Set;

import org.simantics.db.ReadGraph;
import org.simantics.db.Resource;
import org.simantics.db.common.request.ResourceRead;
import org.simantics.db.exception.DatabaseException;
import org.simantics.layer0.Layer0;

/**
 * @author Tuukka Lehtonen
 */
public class IsEnumeratedValue extends ResourceRead<Boolean> {

    public IsEnumeratedValue(Resource resource) {
        super(resource);
    }

    @Override
    public Boolean perform(ReadGraph graph) throws DatabaseException {
        return Boolean.valueOf(isEnumeratedValue(graph, resource));
    }

    public static boolean isEnumeratedValue(ReadGraph graph, Resource resource) throws DatabaseException {
        Set<Resource> types = graph.getTypes(resource);
        //if (types.contains(graph.getBuiltins().Boolean))
        //    return true;
        for (Resource type : types)
            if (isEnumeration(graph, type))
                return true;
        return false;
    }

    public static boolean isEnumeration(ReadGraph graph, Resource type) throws DatabaseException {
        return graph.hasStatement(type, Layer0.getInstance(graph).Enumeration, type);
    }

}