[388928] Develop a resource transfer framework

https://bugs.eclipse.org/bugs/show_bug.cgi?id=388928

7 files changed, 147 insertions, 0 deletions

diff --git a/plugins/org.eclipse.emf.cdo.transfer.repository.ui/src/org/eclipse/emf/cdo/transfer/repository/internal/ui/RepositoryUIProvider.java b/plugins/org.eclipse.emf.cdo.transfer.repository.ui/src/org/eclipse/emf/cdo/transfer/repository/internal/ui/RepositoryUIProvider.java
index 455bde482a..d573b4d69a 100644
--- a/plugins/org.eclipse.emf.cdo.transfer.repository.ui/src/org/eclipse/emf/cdo/transfer/repository/internal/ui/RepositoryUIProvider.java
+++ b/plugins/org.eclipse.emf.cdo.transfer.repository.ui/src/org/eclipse/emf/cdo/transfer/repository/internal/ui/RepositoryUIProvider.java
@@ -11,6 +11,7 @@
 package org.eclipse.emf.cdo.transfer.repository.internal.ui;
 
 import org.eclipse.emf.cdo.eresource.CDOResourceFolder;
+import org.eclipse.emf.cdo.eresource.CDOResourceNode;
 import org.eclipse.emf.cdo.transaction.CDOTransaction;
 import org.eclipse.emf.cdo.transfer.CDOTransferElement;
 import org.eclipse.emf.cdo.transfer.CDOTransferSystem;
@@ -23,8 +24,11 @@ import org.eclipse.emf.cdo.view.CDOView;
 import org.eclipse.net4j.util.factory.ProductCreationException;
 
 import org.eclipse.jface.viewers.ILabelProvider;
+import org.eclipse.jface.viewers.IStructuredSelection;
 import org.eclipse.swt.dnd.Transfer;
 
+import java.util.ArrayList;
+import java.util.Iterator;
 import java.util.List;
 
 /**
@@ -74,6 +78,22 @@ public class RepositoryUIProvider implements TransferUIProvider
     return null;
   }
 
+  public Object convertSelection(IStructuredSelection selection)
+  {
+    List<CDOResourceNode> result = new ArrayList<CDOResourceNode>();
+    for (Iterator<?> it = selection.iterator(); it.hasNext();)
+    {
+      Object object = it.next();
+      if (object instanceof CDOResourceNode)
+      {
+        CDOResourceNode node = (CDOResourceNode)object;
+        result.add(node);
+      }
+    }
+
+    return result.toArray(new CDOResourceNode[result.size()]);
+  }
+
   /**
    * @author Eike Stepper
    */
diff --git a/plugins/org.eclipse.emf.cdo.transfer.ui/src/org/eclipse/emf/cdo/transfer/internal/ui/FileSystemUIProvider.java b/plugins/org.eclipse.emf.cdo.transfer.ui/src/org/eclipse/emf/cdo/transfer/internal/ui/FileSystemUIProvider.java
index 24372b0fc0..913b0c9071 100644
--- a/plugins/org.eclipse.emf.cdo.transfer.ui/src/org/eclipse/emf/cdo/transfer/internal/ui/FileSystemUIProvider.java
+++ b/plugins/org.eclipse.emf.cdo.transfer.ui/src/org/eclipse/emf/cdo/transfer/internal/ui/FileSystemUIProvider.java
@@ -19,6 +19,7 @@ import org.eclipse.emf.cdo.ui.shared.SharedIcons;
 import org.eclipse.net4j.util.factory.ProductCreationException;
 
 import org.eclipse.jface.viewers.ILabelProvider;
+import org.eclipse.jface.viewers.IStructuredSelection;
 import org.eclipse.jface.viewers.LabelProvider;
 import org.eclipse.swt.dnd.FileTransfer;
 import org.eclipse.swt.dnd.Transfer;
@@ -76,6 +77,12 @@ public class FileSystemUIProvider implements TransferUIProvider
     return null;
   }
 
+  public Object convertSelection(IStructuredSelection selection)
+  {
+    // TODO: implement FileSystemUIProvider.convertSelection(selection)
+    return null;
+  }
+
   /**
    * @author Eike Stepper
    */
diff --git a/plugins/org.eclipse.emf.cdo.transfer.ui/src/org/eclipse/emf/cdo/transfer/spi/ui/TransferUIProvider.java b/plugins/org.eclipse.emf.cdo.transfer.ui/src/org/eclipse/emf/cdo/transfer/spi/ui/TransferUIProvider.java
index a00c1e0e0b..5e1c244c3a 100644
--- a/plugins/org.eclipse.emf.cdo.transfer.ui/src/org/eclipse/emf/cdo/transfer/spi/ui/TransferUIProvider.java
+++ b/plugins/org.eclipse.emf.cdo.transfer.ui/src/org/eclipse/emf/cdo/transfer/spi/ui/TransferUIProvider.java
@@ -17,6 +17,7 @@ import org.eclipse.net4j.util.container.IManagedContainer;
 import org.eclipse.net4j.util.factory.ProductCreationException;
 
 import org.eclipse.jface.viewers.ILabelProvider;
+import org.eclipse.jface.viewers.IStructuredSelection;
 import org.eclipse.swt.dnd.Transfer;
 
 import java.util.ArrayList;
@@ -36,6 +37,8 @@ public interface TransferUIProvider
 
   public CDOTransferElement convertTransferTarget(Object target);
 
+  public Object convertSelection(IStructuredSelection selection);
+
   /**
    * @author Eike Stepper
    */
diff --git a/plugins/org.eclipse.emf.cdo.transfer.ui/src/org/eclipse/emf/cdo/transfer/ui/TransferDragListener.java b/plugins/org.eclipse.emf.cdo.transfer.ui/src/org/eclipse/emf/cdo/transfer/ui/TransferDragListener.java
new file mode 100644
index 0000000000..35e44d0a6f
--- /dev/null
+++ b/plugins/org.eclipse.emf.cdo.transfer.ui/src/org/eclipse/emf/cdo/transfer/ui/TransferDragListener.java
@@ -0,0 +1,92 @@
+/*
+ * Copyright (c) 2004 - 2012 Eike Stepper (Berlin, Germany) and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *    Eike Stepper - initial API and implementation
+ */
+package org.eclipse.emf.cdo.transfer.ui;
+
+import org.eclipse.emf.cdo.transfer.spi.ui.TransferUIProvider;
+import org.eclipse.emf.cdo.transfer.spi.ui.TransferUIProvider.Factory;
+
+import org.eclipse.net4j.util.container.IManagedContainer;
+import org.eclipse.net4j.util.container.IPluginContainer;
+import org.eclipse.net4j.util.ui.dnd.DNDDragListener;
+
+import org.eclipse.jface.viewers.IStructuredSelection;
+import org.eclipse.jface.viewers.StructuredViewer;
+import org.eclipse.swt.dnd.DND;
+import org.eclipse.swt.dnd.DragSourceEvent;
+import org.eclipse.swt.dnd.Transfer;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * @author Eike Stepper
+ */
+public class TransferDragListener extends DNDDragListener<Object>
+{
+  private TransferUIProvider[] uiProviders;
+
+  protected TransferDragListener(StructuredViewer viewer)
+  {
+    super(viewer);
+    uiProviders = getUIProviders();
+
+    List<Transfer> transfers = new ArrayList<Transfer>();
+    for (int i = 0; i < uiProviders.length; i++)
+    {
+      TransferUIProvider uiProvider = uiProviders[i];
+      uiProvider.addSupportedTransfers(transfers);
+    }
+
+    setTransfers(transfers.toArray(new Transfer[transfers.size()]));
+  }
+
+  protected IManagedContainer getContainer()
+  {
+    return IPluginContainer.INSTANCE;
+  }
+
+  protected TransferUIProvider[] getUIProviders()
+  {
+    return Factory.getAll(getContainer());
+  }
+
+  @Override
+  protected Object getObject(IStructuredSelection selection)
+  {
+    for (int i = 0; i < uiProviders.length; i++)
+    {
+      TransferUIProvider uiProvider = uiProviders[i];
+
+      Object object = uiProvider.convertSelection(selection);
+      if (object != null)
+      {
+        return object;
+      }
+    }
+
+    return null;
+  }
+
+  @Override
+  public void dragFinished(DragSourceEvent event)
+  {
+    // TODO Eventually implement removal for move DND
+    super.dragFinished(event);
+  }
+
+  public static TransferDragListener support(StructuredViewer viewer)
+  {
+    TransferDragListener dragListener = new TransferDragListener(viewer);
+    Transfer[] transfers = dragListener.getTransfers();
+    viewer.addDragSupport(DND.DROP_MOVE, transfers, dragListener);
+    return dragListener;
+  }
+}
diff --git a/plugins/org.eclipse.emf.cdo.transfer.workspace.ui/src/org/eclipse/emf/cdo/transfer/internal/workspace/WorkspaceUIProvider.java b/plugins/org.eclipse.emf.cdo.transfer.workspace.ui/src/org/eclipse/emf/cdo/transfer/internal/workspace/WorkspaceUIProvider.java
index a7da8500b8..d07f9f5eba 100644
--- a/plugins/org.eclipse.emf.cdo.transfer.workspace.ui/src/org/eclipse/emf/cdo/transfer/internal/workspace/WorkspaceUIProvider.java
+++ b/plugins/org.eclipse.emf.cdo.transfer.workspace.ui/src/org/eclipse/emf/cdo/transfer/internal/workspace/WorkspaceUIProvider.java
@@ -22,6 +22,7 @@ import org.eclipse.core.resources.IResource;
 import org.eclipse.jface.viewers.DecoratingLabelProvider;
 import org.eclipse.jface.viewers.ILabelDecorator;
 import org.eclipse.jface.viewers.ILabelProvider;
+import org.eclipse.jface.viewers.IStructuredSelection;
 import org.eclipse.swt.dnd.Transfer;
 import org.eclipse.ui.PlatformUI;
 import org.eclipse.ui.model.WorkbenchLabelProvider;
@@ -77,6 +78,12 @@ public class WorkspaceUIProvider implements TransferUIProvider
     return null;
   }
 
+  public Object convertSelection(IStructuredSelection selection)
+  {
+    // TODO: implement WorkspaceUIProvider.convertSelection(selection)
+    return null;
+  }
+
   /**
    * @author Eike Stepper
    */
diff --git a/plugins/org.eclipse.emf.cdo.ui/src/org/eclipse/emf/cdo/internal/ui/views/CDOSessionsView.java b/plugins/org.eclipse.emf.cdo.ui/src/org/eclipse/emf/cdo/internal/ui/views/CDOSessionsView.java
index e73f480fb2..463d1d2403 100644
--- a/plugins/org.eclipse.emf.cdo.ui/src/org/eclipse/emf/cdo/internal/ui/views/CDOSessionsView.java
+++ b/plugins/org.eclipse.emf.cdo.ui/src/org/eclipse/emf/cdo/internal/ui/views/CDOSessionsView.java
@@ -14,6 +14,7 @@ import org.eclipse.emf.cdo.eresource.CDOResourceFolder;
 import org.eclipse.emf.cdo.eresource.CDOResourceLeaf;
 import org.eclipse.emf.cdo.internal.ui.actions.OpenSessionAction;
 import org.eclipse.emf.cdo.session.CDOSession;
+import org.eclipse.emf.cdo.transfer.ui.TransferDragListener;
 import org.eclipse.emf.cdo.transfer.ui.TransferDropAdapter;
 import org.eclipse.emf.cdo.ui.CDOEditorUtil;
 import org.eclipse.emf.cdo.ui.CDOItemProvider;
@@ -62,6 +63,7 @@ public class CDOSessionsView extends ContainerView
     Control control = super.createUI(parent);
 
     TreeViewer viewer = getViewer();
+    TransferDragListener.support(viewer);
     TransferDropAdapter.support(viewer);
 
     return control;
diff --git a/plugins/org.eclipse.net4j.util.ui/src/org/eclipse/net4j/util/ui/dnd/DNDDragListener.java b/plugins/org.eclipse.net4j.util.ui/src/org/eclipse/net4j/util/ui/dnd/DNDDragListener.java
index 6a5b49d340..31f9cca423 100644
--- a/plugins/org.eclipse.net4j.util.ui/src/org/eclipse/net4j/util/ui/dnd/DNDDragListener.java
+++ b/plugins/org.eclipse.net4j.util.ui/src/org/eclipse/net4j/util/ui/dnd/DNDDragListener.java
@@ -35,6 +35,14 @@ public abstract class DNDDragListener<TYPE> extends DragSourceAdapter
   }
 
   /**
+   * @since 3.3
+   */
+  protected DNDDragListener(StructuredViewer viewer)
+  {
+    this.viewer = viewer;
+  }
+
+  /**
    * @since 3.0
    */
   public Transfer[] getTransfers()
@@ -42,6 +50,14 @@ public abstract class DNDDragListener<TYPE> extends DragSourceAdapter
     return transfers;
   }
 
+  /**
+   * @since 3.3
+   */
+  public void setTransfers(Transfer[] transfers)
+  {
+    this.transfers = transfers;
+  }
+
   public StructuredViewer getViewer()
   {
     return viewer;