bundles/org.simantics.browsing.ui.graph.impl/src/org/simantics/browsing/ui/graph/impl/GraphViewpointFactory.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.BuiltinKeys;\r
  17 import org.simantics.browsing.ui.NodeContext;\r
  18 import org.simantics.browsing.ui.PrimitiveQueryUpdater;\r
  19 import org.simantics.browsing.ui.BuiltinKeys.ViewpointKey;\r
  20 import org.simantics.browsing.ui.content.Viewpoint;\r
  21 import org.simantics.browsing.ui.content.ViewpointFactory;\r
  22 import org.simantics.db.ReadGraph;\r
  23 import org.simantics.db.Resource;\r
  24 import org.simantics.db.exception.DatabaseException;\r
  25 \r
  26 public abstract class GraphViewpointFactory implements ViewpointFactory {\r
  27 \r
  28     @Override\r
  29     public Viewpoint create(PrimitiveQueryUpdater updater,\r
  30             NodeContext context, ViewpointKey key) {\r
  31         assert(updater != null);\r
  32         assert(context != null);\r
  33 \r
  34         return new LazyViewpoint(updater, context, key) {\r
  35             @Override\r
  36             public NodeContext[] children(ReadGraph graph) throws DatabaseException {\r
  37                 return toContextsWithInput(GraphViewpointFactory.this.\r
  38                         getChildren(graph, (Resource) context.getConstant(BuiltinKeys.INPUT)));\r
  39             }\r
  40 \r
  41             @Override\r
  42             public Boolean hasChildren(ReadGraph graph) throws DatabaseException {\r
  43                 return children(graph).length > 0;\r
  44             }\r
  45 \r
  46             @Override\r
  47             public String toString() {\r
  48                 return GraphViewpointFactory.this.toString();\r
  49             }\r
  50 \r
  51             @Override\r
  52             public Object getIdentity() {\r
  53                 return GraphViewpointFactory.this.getClass();\r
  54             }\r
  55 \r
  56         };\r
  57     }\r
  58 \r
  59     abstract protected Collection<?> getChildren(ReadGraph g, Resource r) throws DatabaseException;\r
  60     protected boolean hasChildren(ReadGraph g, Resource r) throws DatabaseException {\r
  61         return !getChildren(g, r).isEmpty();\r
  62     }\r
  63 \r
  64 }\r