/*******************************************************************************
 * 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 org.simantics.browsing.ui.BuiltinKeys;
import org.simantics.browsing.ui.NodeContext;
import org.simantics.browsing.ui.PrimitiveQueryUpdater;
import org.simantics.browsing.ui.BuiltinKeys.ViewpointKey;
import org.simantics.browsing.ui.common.NodeContextUtil;
import org.simantics.browsing.ui.common.viewpoints.LazyContainerViewpoint;
import org.simantics.browsing.ui.content.Viewpoint;
import org.simantics.browsing.ui.content.ViewpointFactory;

public class TypeIndexStructureViewpointFactory implements ViewpointFactory {

    @Override
    public Viewpoint create(final PrimitiveQueryUpdater provider, final NodeContext context, final ViewpointKey key) {
        assert (provider != null);
        assert (context != null);

        final LazyContainerViewpoint result = new LazyContainerViewpoint();

        final TypeIndex index = (TypeIndex) context.getConstant(BuiltinKeys.INPUT);
        assert (index != null);

        NodeContext[] resultContexts = NodeContextUtil.toContextsWithInput(index.instances);

        result.setChildren(provider, resultContexts);
        result.setHasChildren(resultContexts.length > 0);

        return result;
    }

    @Override
    public String toString() {
        return "Structure by types";
    }

}