bundles/org.simantics.browsing.ui.graph.impl/src/org/simantics/browsing/ui/graph/impl/ConsistsOfViewpointFactory.java

   1 /*******************************************************************************
   2  * Copyright (c) 2007, 2010 Association for Decentralized Information Management
   3  * in Industry THTH ry.
   4  * All rights reserved. This program and the accompanying materials
   5  * are made available under the terms of the Eclipse Public License v1.0
   6  * which accompanies this distribution, and is available at
   7  * http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  * Contributors:
  10  *     VTT Technical Research Centre of Finland - initial API and implementation
  11  *******************************************************************************/
  12 package org.simantics.browsing.ui.graph.impl;
  13
  14 import org.simantics.browsing.ui.BuiltinKeys;
  15 import org.simantics.browsing.ui.BuiltinKeys.ViewpointKey;
  16 import org.simantics.browsing.ui.NodeContext;
  17 import org.simantics.browsing.ui.PrimitiveQueryUpdater;
  18 import org.simantics.browsing.ui.content.Viewpoint;
  19 import org.simantics.browsing.ui.content.ViewpointFactory;
  20 import org.simantics.db.ReadGraph;
  21 import org.simantics.db.Resource;
  22 import org.simantics.db.exception.DatabaseException;
  23 import org.simantics.layer0.Layer0;
  24
  25 public class ConsistsOfViewpointFactory implements ViewpointFactory {
  26
  27     @Override
  28     public Viewpoint create(PrimitiveQueryUpdater updater, final NodeContext context, ViewpointKey key) {
  29         assert(updater != null);
  30         assert(context != null);
  31
  32         return new LazyViewpoint(updater, context, key) {
  33             @Override
  34             public NodeContext[] children(ReadGraph graph) throws DatabaseException {
  35                 Layer0 L0 = Layer0.getInstance(graph);
  36                 return toContextsWithInput(graph.getObjects((Resource) context.getConstant(BuiltinKeys.INPUT), L0.ConsistsOf));
  37             }
  38
  39             @Override
  40             public Boolean hasChildren(ReadGraph graph) throws DatabaseException {
  41                 return Boolean.valueOf(children(graph).length > 0);
  42             }
  43         };
  44     }
  45
  46     @Override
  47     public String toString() {
  48         return "Structure";
  49     }
  50
  51 }