bundles/org.simantics.ui/src/org/simantics/ui/dnd/SubgraphTransfer.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.ui.dnd;\r
  13 \r
  14 import java.io.IOException;\r
  15 \r
  16 import org.eclipse.swt.dnd.ByteArrayTransfer;\r
  17 import org.eclipse.swt.dnd.DND;\r
  18 import org.eclipse.swt.dnd.TransferData;\r
  19 import org.simantics.databoard.Bindings;\r
  20 import org.simantics.databoard.serialization.Serializer;\r
  21 import org.simantics.graph.representation.TransferableGraph1;\r
  22 import org.simantics.utils.ui.ErrorLogger;\r
  23 \r
  24 /**\r
  25  * @author Tuukka Lehtonen\r
  26  */\r
  27 public class SubgraphTransfer extends ByteArrayTransfer {\r
  28 \r
  29     private static final String          TYPENAME  = "graph";\r
  30     private static final int             TYPEID    = registerType(TYPENAME);\r
  31     private static final int[]           TYPEIDS   = new int[] { TYPEID };\r
  32     private static final String[]        TYPENAMES = new String[] { TYPENAME };\r
  33 \r
  34     public static final SubgraphTransfer INSTANCE = createInstance();\r
  35 \r
  36     SubgraphTransfer() {}\r
  37 \r
  38     public static SubgraphTransfer getInstance() {\r
  39         return INSTANCE;\r
  40     }\r
  41 \r
  42     public static SubgraphTransfer createInstance() {\r
  43         SubgraphTransfer result = new SubgraphTransfer();\r
  44         return result;\r
  45     }\r
  46 \r
  47     public void javaToNative(Object object, TransferData transferData) {\r
  48         if (!(object instanceof TransferableGraph1) || !isSupportedType(transferData)) \r
  49             DND.error(DND.ERROR_INVALID_DATA);\r
  50 \r
  51         Serializer s = Bindings.getSerializerUnchecked(TransferableGraph1.class);\r
  52         try {\r
  53             byte[] data = s.serialize(object);\r
  54             super.javaToNative(data, transferData);\r
  55         } catch (IOException e) {\r
  56             ErrorLogger.defaultLogError(e);\r
  57         }\r
  58     }\r
  59 \r
  60     public Object nativeToJava(TransferData transferData) {\r
  61         if (!isSupportedType(transferData)) return null;\r
  62 \r
  63         byte[] data = (byte[]) super.nativeToJava(transferData);\r
  64         try {\r
  65             Serializer s = Bindings.getSerializerUnchecked(TransferableGraph1.class);\r
  66             return s.deserialize(data);\r
  67         } catch (IOException e) {\r
  68             return null;\r
  69         }\r
  70     }\r
  71 \r
  72     protected String[] getTypeNames() {\r
  73         return TYPENAMES;\r
  74     }\r
  75 \r
  76     protected int[] getTypeIds() {\r
  77         return TYPEIDS;\r
  78     }\r
  79 \r
  80     protected boolean validate(Object object) {\r
  81         return object instanceof TransferableGraph1;\r
  82     }\r
  83 \r
  84 }\r