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

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