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