/*******************************************************************************
 * 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.layer0.adapter.impl;

import java.util.Map;

import org.simantics.db.ReadGraph;
import org.simantics.db.Resource;
import org.simantics.db.WriteGraph;
import org.simantics.db.exception.DatabaseException;
import org.simantics.db.layer0.adapter.Remover;

/**
 * @author Tuukka Lehtonen
 */
public abstract class AbstractRemover implements Remover {

    protected final Resource resource;

    public AbstractRemover(Resource resource) {
        this.resource = resource;
    }

    protected String consultPossibleCanRemove(ReadGraph graph, Resource r, Map<Object, Object> aux) throws DatabaseException {
        Remover remover = graph.getPossibleAdapter(r, Remover.class);
        if (remover != null) {
            return remover.canRemove(graph, aux);
        }
        return null;
    }

    protected boolean consultPossibleRemover(WriteGraph graph, Resource r) throws DatabaseException {
        Remover remover = graph.getPossibleAdapter(r, Remover.class);
        if (remover != null) {
            remover.remove(graph);
            return true;
        }
        return false;
    }

    @Override
    public String canRemove(ReadGraph graph, Map<Object, Object> aux) throws DatabaseException {
        return null;
    }

}