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/*******************************************************************************
* Copyright (c) 2006, 2009 IBM Corporation 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:
* IBM Corporation - initial API and implementation
* Anton Leherbauer (Wind River Systems) - http://bugs.eclipse.org/247294
******************************************************************************/
package org.eclipse.ui.navigator.resources;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.Set;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.Platform;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.swt.dnd.DragSourceEvent;
import org.eclipse.swt.dnd.FileTransfer;
import org.eclipse.swt.dnd.Transfer;
import org.eclipse.ui.internal.navigator.Policy;
import org.eclipse.ui.navigator.CommonDragAdapterAssistant;
import org.eclipse.ui.navigator.INavigatorDnDService;
import org.eclipse.ui.part.ResourceTransfer;
/**
* Clients may reference this class in the <b>dragAssistant</b> element of a
* <b>org.eclipse.ui.navigator.viewer</b> extension point.
*
* <p>
* Clients may not extend or instantiate this class for any purpose other than
* {@link INavigatorDnDService#bindDragAssistant(CommonDragAdapterAssistant)}.
* Clients may have no direct dependencies on the contract of this class.
* </p>
*
* @since 3.2
* @noextend This class is not intended to be subclassed by clients.
*
*/
public class ResourceDragAdapterAssistant extends
CommonDragAdapterAssistant {
private static final Transfer[] SUPPORTED_TRANSFERS = new Transfer[] {
ResourceTransfer.getInstance(),
FileTransfer.getInstance() };
private static final Class<IResource> IRESOURCE_TYPE = IResource.class;
/*
* (non-Javadoc)
*
* @see org.eclipse.ui.navigator.CommonDragAdapterAssistant#getSupportedTransferTypes()
*/
@Override
public Transfer[] getSupportedTransferTypes() {
return SUPPORTED_TRANSFERS;
}
/*
* (non-Javadoc)
*
* @see org.eclipse.ui.navigator.CommonDragAdapterAssistant#setDragData(org.eclipse.swt.dnd.DragSourceEvent,
* org.eclipse.jface.viewers.IStructuredSelection)
*/
@Override
public boolean setDragData(DragSourceEvent anEvent,
IStructuredSelection aSelection) {
IResource[] resources = getSelectedResources(aSelection);
if (resources.length > 0) {
if (ResourceTransfer.getInstance().isSupportedType(anEvent.dataType)) {
anEvent.data = resources;
if (Policy.DEBUG_DND) {
System.out
.println("ResourceDragAdapterAssistant.dragSetData set ResourceTransfer"); //$NON-NLS-1$
}
return true;
}
if (FileTransfer.getInstance().isSupportedType(anEvent.dataType)) {
// Get the path of each file and set as the drag data
final int length = resources.length;
int actualLength = 0;
String[] fileNames = new String[length];
for (int i = 0; i < length; i++) {
IPath location = resources[i].getLocation();
// location may be null. See bug 29491.
if (location != null) {
fileNames[actualLength++] = location.toOSString();
}
}
if (actualLength > 0) {
// was one or more of the locations null?
if (actualLength < length) {
String[] tempFileNames = fileNames;
fileNames = new String[actualLength];
for (int i = 0; i < actualLength; i++)
fileNames[i] = tempFileNames[i];
}
anEvent.data = fileNames;
if (Policy.DEBUG_DND)
System.out
.println("ResourceDragAdapterAssistant.dragSetData set FileTransfer"); //$NON-NLS-1$
return true;
}
}
}
return false;
}
private IResource[] getSelectedResources(IStructuredSelection aSelection) {
Set<IResource> resources = new LinkedHashSet<IResource>();
IResource resource = null;
for (Iterator<?> iter = aSelection.iterator(); iter.hasNext();) {
Object selected = iter.next();
resource = adaptToResource(selected);
if (resource != null) {
resources.add(resource);
}
}
return resources.toArray(new IResource[resources.size()]);
}
private IResource adaptToResource(Object selected) {
IResource resource;
if (selected instanceof IResource) {
resource = (IResource) selected;
} else if (selected instanceof IAdaptable) {
resource = (IResource) ((IAdaptable) selected)
.getAdapter(IRESOURCE_TYPE);
} else {
resource = (IResource) Platform.getAdapterManager().getAdapter(
selected, IRESOURCE_TYPE);
}
return resource;
}
}
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