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