Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.ui / src / org / simantics / ui / dnd / ResourceReferenceTransfer.java

diff --git a/bundles/org.simantics.ui/src/org/simantics/ui/dnd/ResourceReferenceTransfer.java b/bundles/org.simantics.ui/src/org/simantics/ui/dnd/ResourceReferenceTransfer.java
new file mode 100644 (file)
index 0000000..10e39c1
--- /dev/null
+++ b/bundles/org.simantics.ui/src/org/simantics/ui/dnd/ResourceReferenceTransfer.java
@@ -0,0 +1,145 @@
+/*******************************************************************************\r
+ * Copyright (c) 2007, 2010 Association for Decentralized Information Management\r
+ * in Industry THTH ry.\r
+ * All rights reserved. This program and the accompanying materials\r
+ * are made available under the terms of the Eclipse Public License v1.0\r
+ * which accompanies this distribution, and is available at\r
+ * http://www.eclipse.org/legal/epl-v10.html\r
+ *\r
+ * Contributors:\r
+ *     VTT Technical Research Centre of Finland - initial API and implementation\r
+ *******************************************************************************/\r
+package org.simantics.ui.dnd;\r
+\r
+import org.eclipse.swt.dnd.ByteArrayTransfer;\r
+import org.eclipse.swt.dnd.DND;\r
+import org.eclipse.swt.dnd.TextTransfer;\r
+import org.eclipse.swt.dnd.TransferData;\r
+import org.simantics.db.Resource;\r
+import org.simantics.db.Session;\r
+import org.simantics.db.common.ResourceArray;\r
+import org.simantics.db.exception.DatabaseException;\r
+import org.simantics.db.service.SerialisationSupport;\r
+import org.simantics.ui.SimanticsUI;\r
+\r
+/**\r
+ * @author Tuukka Lehtonen\r
+ */\r
+public class ResourceReferenceTransfer extends ByteArrayTransfer {\r
+\r
+    private static final String                    TYPENAME = "ResourceReferenceTransfer";\r
+\r
+    private static final int                       TYPEID   = registerType(TYPENAME);\r
+\r
+    private static final ResourceReferenceTransfer INSTANCE = createInstance((String) null);\r
+\r
+    private String                                 purpose;\r
+    private Session                                session;\r
+\r
+    public static ResourceReferenceTransfer getInstance() {\r
+        return INSTANCE;\r
+    }\r
+\r
+    public static ResourceReferenceTransfer createInstance(Session session) {\r
+        ResourceReferenceTransfer result = new ResourceReferenceTransfer(null);\r
+        result.session = session;\r
+        return result;\r
+    }\r
+\r
+    public static ResourceReferenceTransfer createInstance(String purpose) {\r
+        ResourceReferenceTransfer result = new ResourceReferenceTransfer(purpose);\r
+        return result;\r
+    }\r
+\r
+    ResourceReferenceTransfer(String purpose) {\r
+        this.purpose = purpose;\r
+    }\r
+\r
+    private Session getSession() {\r
+        // NOTE return SimanticsUI is a big HAXXX\r
+        return session == null ? SimanticsUI.getSession() : session;\r
+    }\r
+\r
+    public void javaToNative(Object object, TransferData transferData) {\r
+        if (!checkResourceReference(object) || !isSupportedType(transferData)) {\r
+            DND.error(DND.ERROR_INVALID_DATA);\r
+        }\r
+        ResourceArray[] resources = null;\r
+        if (object instanceof Resource)\r
+            resources = new ResourceArray[] {new ResourceArray((Resource) object)};\r
+        if (object instanceof Resource[])\r
+            resources = new ResourceArray[] {new ResourceArray((Resource[]) object)};\r
+        if (object instanceof ResourceArray)\r
+            resources = new ResourceArray[] {(ResourceArray) object};\r
+        if (object instanceof ResourceArray[])\r
+            resources = (ResourceArray[]) object;\r
+        if (resources==null)\r
+            DND.error(DND.ERROR_INVALID_DATA);\r
+        //throw new IllegalArgumentException();\r
+\r
+        // write data to a byte array and then ask super to convert to\r
+        // pMedium\r
+        Session s = getSession();\r
+        SerialisationSupport support = s.getService(SerialisationSupport.class);\r
+        ResourceTransferData rtd = new ResourceTransferData(s, resources);\r
+        rtd.setPurpose(purpose);\r
+\r
+        Object buffer;\r
+        try {\r
+            buffer = ResourceTransferUtils.createStringTransferable(support, rtd);\r
+        } catch (DatabaseException e) {\r
+            throw new RuntimeException(e);\r
+        }\r
+        TextTransfer.getInstance().javaToNative(buffer, transferData);\r
+    }\r
+\r
+    public Object nativeToJava(TransferData transferData) {\r
+        if (isSupportedType(transferData)) {\r
+            String buffer = (String) TextTransfer.getInstance().nativeToJava(transferData);\r
+            if (buffer == null)\r
+                return null;\r
+\r
+            Session s = getSession();\r
+            SerialisationSupport support = s.getService(SerialisationSupport.class);\r
+            ResourceTransferData rtd;\r
+            try {\r
+                rtd = ResourceTransferUtils.readStringTransferable(support, buffer);\r
+            } catch (IllegalArgumentException e) {\r
+                throw new RuntimeException(e);\r
+            } catch (DatabaseException e) {\r
+                throw new RuntimeException(e);\r
+            }\r
+            // FIXME: the transferred "purpose" data cannot be passed further\r
+            // because this method is currently assumed to return\r
+            // ResourceArray[] instead of ResourceTransferData\r
+            return rtd.toResourceArrayArray();\r
+        }\r
+        return null;\r
+    }\r
+\r
+    protected String[] getTypeNames() {\r
+        return new String[] { TYPENAME };\r
+    }\r
+\r
+    protected int[] getTypeIds() {\r
+        return new int[] { TYPEID };\r
+    }\r
+\r
+    boolean checkResourceReference(Object object) {\r
+        System.out.println("o = " + object);\r
+        if (object == null) return false;\r
+        if ( !(object instanceof ResourceArray[]) || ((ResourceArray[]) object).length == 0) {\r
+            return false;\r
+        }\r
+//        ResourceReference[] ResourceReferences = (ResourceReference[]) object;\r
+//        for (int i = 0; i < ResourceReferences.length; i++) {\r
+//            // Check each reference if there is something to check\r
+//        }\r
+        return true;\r
+    }\r
+\r
+    protected boolean validate(Object object) {\r
+        return checkResourceReference(object);\r
+    }\r
+\r
+}\r