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

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