/*******************************************************************************
 * 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;

import java.util.Collection;

import org.simantics.browsing.ui.NodeContext;
import org.simantics.browsing.ui.PrimitiveQueryUpdater;
import org.simantics.browsing.ui.Tester;
import org.simantics.browsing.ui.BuiltinKeys.ViewpointContributionKey;
import org.simantics.browsing.ui.content.Contributor;
import org.simantics.browsing.ui.content.ViewpointContribution;
import org.simantics.browsing.ui.content.ViewpointContributionFactory;
import org.simantics.browsing.ui.graph.impl.contribution.ViewpointContributionImpl;
import org.simantics.db.ReadGraph;
import org.simantics.db.exception.DatabaseException;
import org.simantics.utils.ReflectionUtils;

abstract public class LazyViewpointContributionContributor<InputClass> implements Contributor<ViewpointContributionFactory> {

    abstract public Collection<NodeContext> children(ReadGraph graph, NodeContext context, PrimitiveQueryUpdater updater, ViewpointContributionKey key, ViewpointContributionImpl contribution) throws DatabaseException;
    abstract public String getViewpointId();
    
    final private Class<?> clazz;

    public LazyViewpointContributionContributor() {
    	clazz = ReflectionUtils.getSingleParameterType(getClass());
    }

    @Override
    public ViewpointContributionFactory getFactory() {

    	return new ViewpointContributionFactory() {
			
			@Override
			public String getViewpointId() {
				return LazyViewpointContributionContributor.this.getViewpointId();
			}
			
			@Override
			public ViewpointContribution create(final PrimitiveQueryUpdater updater, NodeContext context, final ViewpointContributionKey key) {
				
		        return new ViewpointContributionImpl(updater, context, key) {

		            @Override
		            public Collection<NodeContext> children(ReadGraph graph, NodeContext context) throws DatabaseException {

		                return LazyViewpointContributionContributor.this.children(graph, context, updater, key, this);

		            }

		            @Override
		            public Tester getNodeContextTester() {
		                return LazyViewpointContributionContributor.this.getNodeContextTester();
		            }

					@Override
					public Class<?> getInputClass() {
		                return LazyViewpointContributionContributor.this.getInputClass();
					}

		        };
		        
			}
			
		};
		
    }
    
    @Override
    public Class<?> getInputClass() {
    	return clazz;
    }

}