/*******************************************************************************
 * 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.browsing.ui.graph.impl.contribution;

import java.util.Map;

import org.eclipse.jface.resource.ImageDescriptor;
import org.simantics.browsing.ui.BuiltinKeys.ImagerKey;
import org.simantics.browsing.ui.NodeContext;
import org.simantics.browsing.ui.PrimitiveQueryUpdater;
import org.simantics.db.AsyncReadGraph;
import org.simantics.db.procedure.Listener;
import org.simantics.db.procedure.Procedure;
import org.simantics.utils.ui.ErrorLogger;

/**
 * Implement {@link #children(AsyncReadGraph)} and {@link #hasChildren(AsyncReadGraph)}.
 * 
 * @author Tuukka Lehtonen
 */
@SuppressWarnings("unchecked")
public abstract class ImagerContributionImpl extends FinalImagerContributionImpl {

    public ImagerContributionImpl(PrimitiveQueryUpdater updater,
            NodeContext context, ImagerKey key) {
        super(updater, context, key);
    }

    @Override
    protected Procedure<Map<String, ImageDescriptor>> createProcedure() {

        return new Listener<Map<String, ImageDescriptor>>() {

    		boolean executed = false;
    		boolean disposed = false;

            @Override
            public void execute(Map<String, ImageDescriptor> result) {
                replaceResult(result);
                executed = true;
            }

            @Override
            public boolean isDisposed() {
            	
            	if(disposed) return true;
            	
            	if((updater.isDisposed() || !updater.isShown(context)) && executed) {
            		content = null;
            		disposed = true;
            		return true;
            	} else {
            		return false;
            	}
            	
            }

            @Override
            public void exception(Throwable t) {
                ErrorLogger.defaultLogError("ImagerContributionImpl.imagerQuery failed, see exception for details.", t);
            }

        };

    }

}