bundles/org.simantics.diagram/src/org/simantics/diagram/adapter/CanvasAdapterFactory.java

   1 /*******************************************************************************\r
   2  * Copyright (c) 2011 Association for Decentralized Information Management in\r
   3  * 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.adapter;\r
  13 \r
  14 import java.util.concurrent.atomic.AtomicBoolean;\r
  15 \r
  16 import org.eclipse.core.runtime.IAdaptable;\r
  17 import org.eclipse.core.runtime.IAdapterFactory;\r
  18 import org.simantics.g2d.canvas.ICanvasContext;\r
  19 \r
  20 /**\r
  21  * @author Tuukka Lehtonen\r
  22  */\r
  23 public class CanvasAdapterFactory implements IAdapterFactory {\r
  24 \r
  25     /**\r
  26      * Hack for preventing eternal {@link #getAdapter(Object, Class)} recursion\r
  27      */\r
  28     AtomicBoolean adapting = new AtomicBoolean(false);\r
  29 \r
  30     @SuppressWarnings("rawtypes")\r
  31     @Override\r
  32     public Object getAdapter(Object adaptableObject, Class adapterType) {\r
  33         if (!adapting.compareAndSet(false, true)) {\r
  34             return null;\r
  35         }\r
  36         try {\r
  37             if (ICanvasContext.class.equals(adapterType)) {\r
  38                 if (adaptableObject instanceof IAdaptable) {\r
  39                     return ((IAdaptable) adaptableObject).getAdapter(adapterType);\r
  40                 }\r
  41             }\r
  42             return null;\r
  43         } finally {\r
  44             adapting.set(false);\r
  45         }\r
  46     }\r
  47 \r
  48     @SuppressWarnings("rawtypes")\r
  49     @Override\r
  50     public Class[] getAdapterList() {\r
  51         return new Class[] { ICanvasContext.class };\r
  52     }\r
  53 \r
  54 }\r