bundles/org.simantics.diagram/src/org/simantics/diagram/synchronization/graph/GraphSynchronizationContext.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.diagram.synchronization.graph;\r
  13 \r
  14 import org.simantics.db.ReadGraph;\r
  15 import org.simantics.db.WriteGraph;\r
  16 import org.simantics.diagram.internal.DebugPolicy;\r
  17 import org.simantics.diagram.synchronization.IModifiableSynchronizationContext;\r
  18 import org.simantics.diagram.synchronization.IModificationQueue;\r
  19 import org.simantics.diagram.synchronization.SynchronizationHints;\r
  20 import org.simantics.utils.datastructures.hints.HintContext;\r
  21 import org.simantics.utils.datastructures.hints.IHintContext;\r
  22 import org.simantics.utils.datastructures.hints.IHintContext.Key;\r
  23 \r
  24 /**\r
  25  * @author Tuukka Lehtonen\r
  26  */\r
  27 public class GraphSynchronizationContext implements IModifiableSynchronizationContext {\r
  28 \r
  29     private final IHintContext ctx = new HintContext();\r
  30 \r
  31     public GraphSynchronizationContext(ReadGraph graph, IModificationQueue modificationQueue) {\r
  32         ctx.setHint(GraphSynchronizationHints.SESSION, graph.getSession());\r
  33         ctx.setHint(GraphSynchronizationHints.BASIC_RESOURCES, BasicResources.getInstance(graph));\r
  34         ctx.setHint(SynchronizationHints.MODIFICATION_QUEUE, modificationQueue);\r
  35     }\r
  36 \r
  37     public static GraphSynchronizationContext getWriteInstance(WriteGraph graph, IModificationQueue modificationQueue) {\r
  38         GraphSynchronizationContext ctx = new GraphSynchronizationContext(graph, modificationQueue);\r
  39         ctx.ctx.setHint(GraphSynchronizationHints.READ_TRANSACTION, graph);\r
  40         ctx.ctx.setHint(GraphSynchronizationHints.WRITE_TRANSACTION, graph);\r
  41         return ctx;\r
  42     }\r
  43 \r
  44     @Override\r
  45     public <T> T get(Key key) {\r
  46         return ctx.getHint(key);\r
  47     }\r
  48 \r
  49     @Override\r
  50     public <T> T set(Key key, Object value) {\r
  51         if (DebugPolicy.DEBUG_SYNC_CONTEXT)\r
  52             System.out.println(this + ".set(" + key + "): " + value);\r
  53 \r
  54         if (value == null)\r
  55             return ctx.removeHint(key);\r
  56 \r
  57         T t = ctx.getHint(key);\r
  58         ctx.setHint(key, value);\r
  59         return t;\r
  60     }\r
  61 \r
  62 }