1 /*******************************************************************************
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2 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
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3 * in Industry THTH ry.
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4 * All rights reserved. This program and the accompanying materials
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5 * are made available under the terms of the Eclipse Public License v1.0
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6 * which accompanies this distribution, and is available at
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7 * http://www.eclipse.org/legal/epl-v10.html
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10 * VTT Technical Research Centre of Finland - initial API and implementation
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11 *******************************************************************************/
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12 package org.simantics.ui.dnd;
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14 import org.eclipse.swt.dnd.ByteArrayTransfer;
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15 import org.eclipse.swt.dnd.DND;
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16 import org.eclipse.swt.dnd.TextTransfer;
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17 import org.eclipse.swt.dnd.TransferData;
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18 import org.simantics.db.Resource;
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19 import org.simantics.db.Session;
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20 import org.simantics.db.common.ResourceArray;
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21 import org.simantics.db.exception.DatabaseException;
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22 import org.simantics.db.service.SerialisationSupport;
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23 import org.simantics.ui.SimanticsUI;
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26 * @author Tuukka Lehtonen
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28 public class ResourceReferenceTransfer extends ByteArrayTransfer {
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30 private static final String TYPENAME = "ResourceReferenceTransfer";
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32 private static final int TYPEID = registerType(TYPENAME);
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34 private static final ResourceReferenceTransfer INSTANCE = createInstance((String) null);
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36 private String purpose;
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37 private Session session;
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39 public static ResourceReferenceTransfer getInstance() {
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43 public static ResourceReferenceTransfer createInstance(Session session) {
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44 ResourceReferenceTransfer result = new ResourceReferenceTransfer(null);
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45 result.session = session;
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49 public static ResourceReferenceTransfer createInstance(String purpose) {
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50 ResourceReferenceTransfer result = new ResourceReferenceTransfer(purpose);
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54 ResourceReferenceTransfer(String purpose) {
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55 this.purpose = purpose;
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58 private Session getSession() {
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59 // NOTE return SimanticsUI is a big HAXXX
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60 return session == null ? SimanticsUI.getSession() : session;
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63 public void javaToNative(Object object, TransferData transferData) {
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64 if (!checkResourceReference(object) || !isSupportedType(transferData)) {
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65 DND.error(DND.ERROR_INVALID_DATA);
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67 ResourceArray[] resources = null;
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68 if (object instanceof Resource)
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69 resources = new ResourceArray[] {new ResourceArray((Resource) object)};
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70 if (object instanceof Resource[])
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71 resources = new ResourceArray[] {new ResourceArray((Resource[]) object)};
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72 if (object instanceof ResourceArray)
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73 resources = new ResourceArray[] {(ResourceArray) object};
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74 if (object instanceof ResourceArray[])
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75 resources = (ResourceArray[]) object;
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76 if (resources==null)
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77 DND.error(DND.ERROR_INVALID_DATA);
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78 //throw new IllegalArgumentException();
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80 // write data to a byte array and then ask super to convert to
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82 Session s = getSession();
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83 SerialisationSupport support = s.getService(SerialisationSupport.class);
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84 ResourceTransferData rtd = new ResourceTransferData(s, resources);
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85 rtd.setPurpose(purpose);
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89 buffer = ResourceTransferUtils.createStringTransferable(support, rtd);
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90 } catch (DatabaseException e) {
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91 throw new RuntimeException(e);
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93 TextTransfer.getInstance().javaToNative(buffer, transferData);
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96 public Object nativeToJava(TransferData transferData) {
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97 if (isSupportedType(transferData)) {
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98 String buffer = (String) TextTransfer.getInstance().nativeToJava(transferData);
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102 Session s = getSession();
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103 SerialisationSupport support = s.getService(SerialisationSupport.class);
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104 ResourceTransferData rtd;
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106 rtd = ResourceTransferUtils.readStringTransferable(support, buffer);
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107 } catch (IllegalArgumentException e) {
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108 throw new RuntimeException(e);
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109 } catch (DatabaseException e) {
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110 throw new RuntimeException(e);
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112 // FIXME: the transferred "purpose" data cannot be passed further
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113 // because this method is currently assumed to return
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114 // ResourceArray[] instead of ResourceTransferData
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115 return rtd.toResourceArrayArray();
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120 protected String[] getTypeNames() {
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121 return new String[] { TYPENAME };
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124 protected int[] getTypeIds() {
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125 return new int[] { TYPEID };
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128 boolean checkResourceReference(Object object) {
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129 System.out.println("o = " + object);
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130 if (object == null) return false;
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131 if ( !(object instanceof ResourceArray[]) || ((ResourceArray[]) object).length == 0) {
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134 // ResourceReference[] ResourceReferences = (ResourceReference[]) object;
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135 // for (int i = 0; i < ResourceReferences.length; i++) {
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136 // // Check each reference if there is something to check
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141 protected boolean validate(Object object) {
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142 return checkResourceReference(object);
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