core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/cview/CViewDropAdapter.java - cdt/org.eclipse.cdt - Git at Google

 package org.eclipse.cdt.internal.ui.cview;

 /*
  * (c) Copyright IBM Corp. 2000, 2001.
  * All Rights Reserved.
  */

 import java.util.ArrayList;
 import java.util.Iterator;
 import java.util.List;

 import org.eclipse.cdt.ui.CUIPlugin;
 import org.eclipse.core.resources.IContainer;
 import org.eclipse.core.resources.IResource;
 import org.eclipse.core.runtime.IAdaptable;
 import org.eclipse.core.runtime.IStatus;
 import org.eclipse.core.runtime.MultiStatus;
 import org.eclipse.core.runtime.Status;
 import org.eclipse.jface.dialogs.ErrorDialog;
 import org.eclipse.jface.dialogs.IDialogConstants;
 import org.eclipse.jface.dialogs.MessageDialog;
 import org.eclipse.jface.viewers.ISelection;
 import org.eclipse.jface.viewers.IStructuredSelection;
 import org.eclipse.jface.viewers.StructuredViewer;
 import org.eclipse.swt.dnd.DND;
 import org.eclipse.swt.dnd.DropTargetEvent;
 import org.eclipse.swt.dnd.FileTransfer;
 import org.eclipse.swt.dnd.TransferData;
 import org.eclipse.swt.widgets.Display;
 import org.eclipse.swt.widgets.Shell;
 import org.eclipse.ui.PlatformUI;
 import org.eclipse.ui.actions.CopyFilesAndFoldersOperation;
 import org.eclipse.ui.actions.MoveFilesAndFoldersOperation;
 import org.eclipse.ui.actions.ReadOnlyStateChecker;
 import org.eclipse.ui.dialogs.IOverwriteQuery;
 import org.eclipse.ui.part.PluginDropAdapter;
 import org.eclipse.ui.part.ResourceTransfer;
 import org.eclipse.ui.views.navigator.LocalSelectionTransfer;
 ;

 /**
  * Implements drop behaviour for drag and drop operations
  * that land on the resource navigator.
  */
 class CViewDropAdapter extends PluginDropAdapter implements IOverwriteQuery {

 	/**
 	 * A flag indicating that the drop has been cancelled by the user.
 	 */
 	protected boolean isCanceled = false;
 	/**
 	 * A flag indicating that overwrites should always occur.
 	 */
 	protected boolean alwaysOverwrite = false;

 	/**
 	 * The last valid operation.
 	 */
 	private int lastValidOperation = DND.DROP_NONE;

 	/*
 	 * @see org.eclipse.swt.dnd.DropTargetListener#dragEnter(org.eclipse.swt.dnd.DropTargetEvent)
 	 */
 	public void dragEnter(DropTargetEvent event) {
 		if (FileTransfer.getInstance().isSupportedType(event.currentDataType) &&
 			event.detail == DND.DROP_DEFAULT) {
 			// default to copy when dragging from outside Eclipse. Fixes bug 16308.
 			event.detail = DND.DROP_COPY;
 		}
 		super.dragEnter(event);
 	}

 	/**
 	 * Returns an error status with the given info.
 	 */
 	protected IStatus error(String message, Throwable exception) {
 		return new Status(IStatus.ERROR, PlatformUI.PLUGIN_ID, 0, message, exception);
 	}

 	/**
 	 * Returns an error status with the given info.
 	 */
 	protected IStatus error(String message) {
 		return error(message, null);
 	}

 	/**
 	 * Returns an error status, indicating why the given source
 	 * could not be copied or moved.
 	 */
 	protected IStatus error(IResource source, String message) {
 		if (getCurrentOperation() == DND.DROP_COPY) {
 			return error("Can Not Copy", null); //$NON-NLS-1$
 		} else {
 			return error("Can Not Move", null); //$NON-NLS-1$
 		}
 	}

 	/**
 	 * Returns the actual target of the drop, given the resource
 	 * under the mouse.  If the mouse target is a file, then the drop actually
 	 * occurs in its parent.  If the drop location is before or after the
 	 * mouse target, the target is also the parent.
 	 */
 	protected IContainer getActualTarget(IResource mouseTarget) {
 		/* if cursor is before or after mouseTarget, set target to parent */
 		if (getCurrentLocation() == LOCATION_BEFORE || getCurrentLocation() == LOCATION_AFTER) {
 			return mouseTarget.getParent();
 		}
 		/* if cursor is on a file, return the parent */
 		if (mouseTarget.getType() == IResource.FILE) {
 			return mouseTarget.getParent();
 		}
 		/* otherwise the mouseTarget is the real target */
 		return (IContainer)mouseTarget;
 	}

 	/**
 	 * Returns the display
 	 */
 	protected Display getDisplay() {
 		return getViewer().getControl().getDisplay();
 	}

 	/**
 	 * Returns the shell
 	 */
 	protected Shell getShell() {
 		return getViewer().getControl().getShell();
 	}

 	/**
 	 * Returns an error status with the given info.
 	 */
 	protected IStatus info(String message) {
 		return new Status(IStatus.INFO, PlatformUI.PLUGIN_ID, 0, message, null);
 	}

 	/**
 	 * CViewDropAction constructor comment.
 	 */
 	public CViewDropAdapter(StructuredViewer viewer) {
 		super(viewer);
 	}

 	/**
 	 * Adds the given status to the list of problems.  Discards
 	 * OK statuses.  If the status is a multi-status, only its children
 	 * are added.
 	 */
 	protected void mergeStatus(MultiStatus status, IStatus toMerge) {
 		if (!toMerge.isOK()) {
 			status.merge(toMerge);
 		}
 	}

 	/**
 	 * Creates a status object from the given list of problems.
 	 */
 	protected IStatus multiStatus(List problems, String message) {
 		IStatus[] children = new IStatus[problems.size()];
 		problems.toArray(children);
 		if (children.length == 1) {
 			return children[0];
 		} else {
 			return new MultiStatus(PlatformUI.PLUGIN_ID, 0, children, message, null);
 		}
 	}

 	/**
 	 * Returns an status indicating success.
 	 */
 	protected IStatus ok() {
 		return new Status(Status.OK, PlatformUI.PLUGIN_ID, 0, "Ok", null); //$NON-NLS-1$
 	}

 	/**
 	 * Opens an error dialog if necessary.  Takes care of
 	 * complex rules necessary for making the error dialog look nice.
 	 */
 	protected void openError(IStatus status) {
 		if (status == null)
 			return;

 		String genericTitle = "Error"; //$NON-NLS-1$
 		int codes = IStatus.ERROR | IStatus.WARNING;

 		//simple case: one error, not a multistatus
 		if (!status.isMultiStatus()) {
 			ErrorDialog.openError(getShell(), genericTitle, null, status, codes);
 			return;
 		}

 		//one error, single child of multistatus
 		IStatus[] children = status.getChildren();
 		if (children.length == 1) {
 			ErrorDialog.openError(getShell(), status.getMessage(), null, children[0], codes);
 			return;
 		}
 		//several problems
 		ErrorDialog.openError(getShell(), genericTitle, null, status, codes);
 	}

 	/**
 	 * Returns the resource selection from the LocalSelectionTransfer.
 	 *
 	 * @return the resource selection from the LocalSelectionTransfer
 	 */
 	private static final int typeMask = IResource.FOLDER | IResource.FILE;

 	private IResource[] getSelectedResources() {
 		ISelection selection = LocalSelectionTransfer.getInstance().getSelection();
 		List resources = new ArrayList();

 		// Sanity checks
 		if (selection == null || !(selection instanceof IStructuredSelection) || selection.isEmpty()) {
 			return null;
 		}

 		IStructuredSelection structuredSelection = (IStructuredSelection) selection;

 		// loop through list and look for matching items
 		for (Iterator enum = structuredSelection.iterator(); enum.hasNext();) {
 			Object object = enum.next();
 			IResource resource = null;

 			if (object instanceof IResource) {
 				resource = (IResource) object;
 			} else if (object instanceof IAdaptable) {
 				resource = (IResource) ((IAdaptable) object).getAdapter(IResource.class);
 			}
 			if (resource != null && (resource.getType() & typeMask) != 0) {
 				resources.add(resource);
 			}
 		}

 		IResource[] result = new IResource[resources.size()];
 		resources.toArray(result);

 		return result;
 	}

 	/**
 	 * Invoked when an action occurs.
 	 * Argument context is the Window which contains the UI from which this action was fired.
 	 * This default implementation prints the name of this class and its label.
 	 * @see IAction#run
 	 */
 	public boolean performDrop(final Object data) {
 		isCanceled = false;
 		alwaysOverwrite = false;
 		if (getCurrentTarget() == null || data == null) {
 			return false;
 		}
 		boolean result = false;
 		IStatus status = null;
 		IResource[] resources = null;
 		TransferData currentTransfer = getCurrentTransfer();
 		if (LocalSelectionTransfer.getInstance().isSupportedType(currentTransfer)) {
 			resources = getSelectedResources();
 		} else if (ResourceTransfer.getInstance().isSupportedType(currentTransfer)) {
 			resources = (IResource[]) data;
 		} else if (FileTransfer.getInstance().isSupportedType(currentTransfer)) {
 			status = performFileDrop(data);
 			result = status.isOK();
 		} else {
 			result = super.performDrop(data);
 		}
 		if (resources != null) {
 			if (getCurrentOperation() == DND.DROP_COPY) {
 				status = performResourceCopy(getShell(), resources);
 			} else {
 				status = performResourceMove(resources);
 			}
 		}
 		openError(status);
 		return result;
 	}

 	/**
 	 * Performs a drop using the FileTransfer transfer type.
 	 */
 	private IStatus performFileDrop(Object data) {
 		MultiStatus problems = new MultiStatus(PlatformUI.PLUGIN_ID, 0, "ProblemI mporting", null); //$NON-NLS-1$
 		mergeStatus(problems, validateTarget(getCurrentTarget(), getCurrentTransfer()));

 		Object obj = getCurrentTarget();
 		IResource res = null;
 		if (obj instanceof IAdaptable) {
 			res = (IResource)((IAdaptable) obj).getAdapter(IResource.class);
 		}
 		final IContainer target = getActualTarget(res);
 		final String[] names = (String[]) data;
 		// Run the import operation asynchronously.
 		// Otherwise the drag source (e.g., Windows Explorer) will be blocked
 		// while the operation executes. Fixes bug 16478.
 		Display.getCurrent().asyncExec(new Runnable() {
 			public void run() {
 				getShell().forceActive();
 				CopyFilesAndFoldersOperation operation = new CopyFilesAndFoldersOperation(getShell());
 				operation.copyFiles(names, target);
 			}
 		});
 		return problems;
 	}

 	/**
 	 * Performs a resource copy
 	 */
 	private IStatus performResourceCopy(Shell shell, IResource[] sources) {
 		MultiStatus problems = new MultiStatus(PlatformUI.PLUGIN_ID, 1, "Problems Moving", null); //$NON-NLS-1$
 		mergeStatus(problems, validateTarget(getCurrentTarget(), getCurrentTransfer()));

 		Object obj = getCurrentTarget();
 		IResource res = null;
 		if (obj instanceof IAdaptable) {
 			res = (IResource)((IAdaptable) obj).getAdapter(IResource.class);
 		}
 		IContainer target = getActualTarget(res);
 		CopyFilesAndFoldersOperation operation = new CopyFilesAndFoldersOperation(shell);
 		operation.copyResources(sources, target);

 		return problems;
 	}

 	/**
 	 * Performs a resource move
 	 */
 	private IStatus performResourceMove(IResource[] sources) {
 		MultiStatus problems = new MultiStatus(PlatformUI.PLUGIN_ID, 1, "Problems Moving", null); //$NON-NLS-1$
 		mergeStatus(problems, validateTarget(getCurrentTarget(), getCurrentTransfer()));

 		Object obj = getCurrentTarget();
 		IResource res = null;
 		if (obj instanceof IAdaptable) {
 			res = (IResource)((IAdaptable) obj).getAdapter(IResource.class);
 		}
 		IContainer target = getActualTarget(res);
 		ReadOnlyStateChecker checker = new ReadOnlyStateChecker(
 			getShell(),
 			"Move Resource Action",			//$NON-NLS-1$
 			"Move Resource Action");//$NON-NLS-1$
 		sources = checker.checkReadOnlyResources(sources);
 		MoveFilesAndFoldersOperation operation = new MoveFilesAndFoldersOperation(getShell());
 		operation.copyResources(sources, target);

 		return problems;
 	}

 	/* (non-Javadoc)
 	 * Method declared on IOverWriteQuery
 	 */
 	public String queryOverwrite(String pathString) {
 		final String returnCode[] = {CANCEL};
 		final String msg = pathString + " " + CUIPlugin.getResourceString("CViewDragNDrop.txt") ; //$NON-NLS-1$
 		final String[] options = {IDialogConstants.YES_LABEL, IDialogConstants.NO_LABEL, IDialogConstants.YES_TO_ALL_LABEL, IDialogConstants.CANCEL_LABEL};
 		getDisplay().syncExec(new Runnable() {
 			public void run() {
 				MessageDialog dialog = new MessageDialog(getShell(), "Question", null, msg, MessageDialog.QUESTION, options, 0); //$NON-NLS-1$
 				dialog.open();
 				int returnVal = dialog.getReturnCode();
 				String[] returnCodes = {YES, NO, ALL, CANCEL};
 				returnCode[0] = returnVal < 0 ? CANCEL : returnCodes[returnVal];
 			}
 		});
 		return returnCode[0];
 	}

 	/**
 	 * This method is used to notify the action that some aspect of
 	 * the drop operation has changed.
 	 */
 	public boolean validateDrop(Object target, int dragOperation, TransferData transferType) {
 		if (dragOperation != DND.DROP_NONE) {
 			lastValidOperation = dragOperation;
 		}
 		if (FileTransfer.getInstance().isSupportedType(transferType) &&
 			lastValidOperation != DND.DROP_COPY) {
 			// only allow copying when dragging from outside Eclipse
 			return false;
 		}

 		if (super.validateDrop(target, dragOperation, transferType)) {
 			return true;
 		}
 		return validateTarget(target, transferType).isOK();
 	}

 	/**
 	 * Ensures that the drop target meets certain criteria
 	 */
 	private IStatus validateTarget(Object target, TransferData transferType) {
 		if (target instanceof IAdaptable) {
 			IResource r = (IResource)((IAdaptable) target).getAdapter(IResource.class);
 			if (r == null)
 				return info("Target Must Be Resource"); //$NON-NLS-1$
 			target = r;
 		}

 		if (!(target instanceof IResource)) {
 			return info("Target Must Be Resource"); //$NON-NLS-1$
 		}
 		IResource resource = (IResource) target;
 		if (!resource.isAccessible()) {
 			return error("Can Not Drop Into Closed Project"); //$NON-NLS-1$
 		}
 		IContainer destination = getActualTarget(resource);
 		if (destination.getType() == IResource.ROOT) {
 			return error("Resources Can Not Be Siblings"); //$NON-NLS-1$
 		}
 		String message = null;
 		// drag within Eclipse?
 		if (LocalSelectionTransfer.getInstance().isSupportedType(transferType)) {
 			IResource[] selectedResources = getSelectedResources();

 			if (selectedResources == null)
 				message = "Drop Operation Error Other"; //$NON-NLS-1$
 			else {
 				CopyFilesAndFoldersOperation operation;
 				if (lastValidOperation == DND.DROP_COPY) {
 					operation = new CopyFilesAndFoldersOperation(getShell());
 				}
 				else {
 					operation = new MoveFilesAndFoldersOperation(getShell());
 				}
 				message = operation.validateDestination(destination, selectedResources);
 			}
 		} // file import?
 		else if (FileTransfer.getInstance().isSupportedType(transferType)) {
 			String[] sourceNames = (String[]) FileTransfer.getInstance().nativeToJava(transferType);
 			if (sourceNames == null) {
 				// source names will be null on Linux. Use empty names to do destination validation.
 				// Fixes bug 29778
 				sourceNames = new String[0];
 			}
 			CopyFilesAndFoldersOperation copyOperation = new CopyFilesAndFoldersOperation(getShell());
 			message = copyOperation.validateImportDestination(destination, sourceNames);
 		}
 		if (message != null) {
 			return error(message);
 		}
 		return ok();
 	}


 }
	package org.eclipse.cdt.internal.ui.cview;

	/*
	* (c) Copyright IBM Corp. 2000, 2001.
	* All Rights Reserved.
	*/

	import java.util.ArrayList;
	import java.util.Iterator;
	import java.util.List;

	import org.eclipse.cdt.ui.CUIPlugin;
	import org.eclipse.core.resources.IContainer;
	import org.eclipse.core.resources.IResource;
	import org.eclipse.core.runtime.IAdaptable;
	import org.eclipse.core.runtime.IStatus;
	import org.eclipse.core.runtime.MultiStatus;
	import org.eclipse.core.runtime.Status;
	import org.eclipse.jface.dialogs.ErrorDialog;
	import org.eclipse.jface.dialogs.IDialogConstants;
	import org.eclipse.jface.dialogs.MessageDialog;
	import org.eclipse.jface.viewers.ISelection;
	import org.eclipse.jface.viewers.IStructuredSelection;
	import org.eclipse.jface.viewers.StructuredViewer;
	import org.eclipse.swt.dnd.DND;
	import org.eclipse.swt.dnd.DropTargetEvent;
	import org.eclipse.swt.dnd.FileTransfer;
	import org.eclipse.swt.dnd.TransferData;
	import org.eclipse.swt.widgets.Display;
	import org.eclipse.swt.widgets.Shell;
	import org.eclipse.ui.PlatformUI;
	import org.eclipse.ui.actions.CopyFilesAndFoldersOperation;
	import org.eclipse.ui.actions.MoveFilesAndFoldersOperation;
	import org.eclipse.ui.actions.ReadOnlyStateChecker;
	import org.eclipse.ui.dialogs.IOverwriteQuery;
	import org.eclipse.ui.part.PluginDropAdapter;
	import org.eclipse.ui.part.ResourceTransfer;
	import org.eclipse.ui.views.navigator.LocalSelectionTransfer;
	;

	/**
	* Implements drop behaviour for drag and drop operations
	* that land on the resource navigator.
	*/
	class CViewDropAdapter extends PluginDropAdapter implements IOverwriteQuery {

	/**
	* A flag indicating that the drop has been cancelled by the user.
	*/
	protected boolean isCanceled = false;
	/**
	* A flag indicating that overwrites should always occur.
	*/
	protected boolean alwaysOverwrite = false;

	/**
	* The last valid operation.
	*/
	private int lastValidOperation = DND.DROP_NONE;

	/*
	* @see org.eclipse.swt.dnd.DropTargetListener#dragEnter(org.eclipse.swt.dnd.DropTargetEvent)
	*/
	public void dragEnter(DropTargetEvent event) {
	if (FileTransfer.getInstance().isSupportedType(event.currentDataType) &&
	event.detail == DND.DROP_DEFAULT) {
	// default to copy when dragging from outside Eclipse. Fixes bug 16308.
	event.detail = DND.DROP_COPY;
	}
	super.dragEnter(event);
	}

	/**
	* Returns an error status with the given info.
	*/
	protected IStatus error(String message, Throwable exception) {
	return new Status(IStatus.ERROR, PlatformUI.PLUGIN_ID, 0, message, exception);
	}

	/**
	* Returns an error status with the given info.
	*/
	protected IStatus error(String message) {
	return error(message, null);
	}

	/**
	* Returns an error status, indicating why the given source
	* could not be copied or moved.
	*/
	protected IStatus error(IResource source, String message) {
	if (getCurrentOperation() == DND.DROP_COPY) {
	return error("Can Not Copy", null); //$NON-NLS-1$
	} else {
	return error("Can Not Move", null); //$NON-NLS-1$
	}
	}

	/**
	* Returns the actual target of the drop, given the resource
	* under the mouse. If the mouse target is a file, then the drop actually
	* occurs in its parent. If the drop location is before or after the
	* mouse target, the target is also the parent.
	*/
	protected IContainer getActualTarget(IResource mouseTarget) {
	/* if cursor is before or after mouseTarget, set target to parent */
	if (getCurrentLocation() == LOCATION_BEFORE \|\| getCurrentLocation() == LOCATION_AFTER) {
	return mouseTarget.getParent();
	}
	/* if cursor is on a file, return the parent */
	if (mouseTarget.getType() == IResource.FILE) {
	return mouseTarget.getParent();
	}
	/* otherwise the mouseTarget is the real target */
	return (IContainer)mouseTarget;
	}

	/**
	* Returns the display
	*/
	protected Display getDisplay() {
	return getViewer().getControl().getDisplay();
	}

	/**
	* Returns the shell
	*/
	protected Shell getShell() {
	return getViewer().getControl().getShell();
	}

	/**
	* Returns an error status with the given info.
	*/
	protected IStatus info(String message) {
	return new Status(IStatus.INFO, PlatformUI.PLUGIN_ID, 0, message, null);
	}

	/**
	* CViewDropAction constructor comment.
	*/
	public CViewDropAdapter(StructuredViewer viewer) {
	super(viewer);
	}

	/**
	* Adds the given status to the list of problems. Discards
	* OK statuses. If the status is a multi-status, only its children
	* are added.
	*/
	protected void mergeStatus(MultiStatus status, IStatus toMerge) {
	if (!toMerge.isOK()) {
	status.merge(toMerge);
	}
	}

	/**
	* Creates a status object from the given list of problems.
	*/
	protected IStatus multiStatus(List problems, String message) {
	IStatus[] children = new IStatus[problems.size()];
	problems.toArray(children);
	if (children.length == 1) {
	return children[0];
	} else {
	return new MultiStatus(PlatformUI.PLUGIN_ID, 0, children, message, null);
	}
	}

	/**
	* Returns an status indicating success.
	*/
	protected IStatus ok() {
	return new Status(Status.OK, PlatformUI.PLUGIN_ID, 0, "Ok", null); //$NON-NLS-1$
	}

	/**
	* Opens an error dialog if necessary. Takes care of
	* complex rules necessary for making the error dialog look nice.
	*/
	protected void openError(IStatus status) {
	if (status == null)
	return;

	String genericTitle = "Error"; //$NON-NLS-1$
	int codes = IStatus.ERROR \| IStatus.WARNING;

	//simple case: one error, not a multistatus
	if (!status.isMultiStatus()) {
	ErrorDialog.openError(getShell(), genericTitle, null, status, codes);
	return;
	}

	//one error, single child of multistatus
	IStatus[] children = status.getChildren();
	if (children.length == 1) {
	ErrorDialog.openError(getShell(), status.getMessage(), null, children[0], codes);
	return;
	}
	//several problems
	ErrorDialog.openError(getShell(), genericTitle, null, status, codes);
	}

	/**
	* Returns the resource selection from the LocalSelectionTransfer.
	*
	* @return the resource selection from the LocalSelectionTransfer
	*/
	private static final int typeMask = IResource.FOLDER \| IResource.FILE;

	private IResource[] getSelectedResources() {
	ISelection selection = LocalSelectionTransfer.getInstance().getSelection();
	List resources = new ArrayList();

	// Sanity checks
	if (selection == null \|\| !(selection instanceof IStructuredSelection) \|\| selection.isEmpty()) {
	return null;
	}

	IStructuredSelection structuredSelection = (IStructuredSelection) selection;

	// loop through list and look for matching items
	for (Iterator enum = structuredSelection.iterator(); enum.hasNext();) {
	Object object = enum.next();
	IResource resource = null;

	if (object instanceof IResource) {
	resource = (IResource) object;
	} else if (object instanceof IAdaptable) {
	resource = (IResource) ((IAdaptable) object).getAdapter(IResource.class);
	}
	if (resource != null && (resource.getType() & typeMask) != 0) {
	resources.add(resource);
	}
	}

	IResource[] result = new IResource[resources.size()];
	resources.toArray(result);

	return result;
	}

	/**
	* Invoked when an action occurs.
	* Argument context is the Window which contains the UI from which this action was fired.
	* This default implementation prints the name of this class and its label.
	* @see IAction#run
	*/
	public boolean performDrop(final Object data) {
	isCanceled = false;
	alwaysOverwrite = false;
	if (getCurrentTarget() == null \|\| data == null) {
	return false;
	}
	boolean result = false;
	IStatus status = null;
	IResource[] resources = null;
	TransferData currentTransfer = getCurrentTransfer();
	if (LocalSelectionTransfer.getInstance().isSupportedType(currentTransfer)) {
	resources = getSelectedResources();
	} else if (ResourceTransfer.getInstance().isSupportedType(currentTransfer)) {
	resources = (IResource[]) data;
	} else if (FileTransfer.getInstance().isSupportedType(currentTransfer)) {
	status = performFileDrop(data);
	result = status.isOK();
	} else {
	result = super.performDrop(data);
	}
	if (resources != null) {
	if (getCurrentOperation() == DND.DROP_COPY) {
	status = performResourceCopy(getShell(), resources);
	} else {
	status = performResourceMove(resources);
	}
	}
	openError(status);
	return result;
	}

	/**
	* Performs a drop using the FileTransfer transfer type.
	*/
	private IStatus performFileDrop(Object data) {
	MultiStatus problems = new MultiStatus(PlatformUI.PLUGIN_ID, 0, "ProblemI mporting", null); //$NON-NLS-1$
	mergeStatus(problems, validateTarget(getCurrentTarget(), getCurrentTransfer()));

	Object obj = getCurrentTarget();
	IResource res = null;
	if (obj instanceof IAdaptable) {
	res = (IResource)((IAdaptable) obj).getAdapter(IResource.class);
	}
	final IContainer target = getActualTarget(res);
	final String[] names = (String[]) data;
	// Run the import operation asynchronously.
	// Otherwise the drag source (e.g., Windows Explorer) will be blocked
	// while the operation executes. Fixes bug 16478.
	Display.getCurrent().asyncExec(new Runnable() {
	public void run() {
	getShell().forceActive();
	CopyFilesAndFoldersOperation operation = new CopyFilesAndFoldersOperation(getShell());
	operation.copyFiles(names, target);
	}
	});
	return problems;
	}

	/**
	* Performs a resource copy
	*/
	private IStatus performResourceCopy(Shell shell, IResource[] sources) {
	MultiStatus problems = new MultiStatus(PlatformUI.PLUGIN_ID, 1, "Problems Moving", null); //$NON-NLS-1$
	mergeStatus(problems, validateTarget(getCurrentTarget(), getCurrentTransfer()));

	Object obj = getCurrentTarget();
	IResource res = null;
	if (obj instanceof IAdaptable) {
	res = (IResource)((IAdaptable) obj).getAdapter(IResource.class);
	}
	IContainer target = getActualTarget(res);
	CopyFilesAndFoldersOperation operation = new CopyFilesAndFoldersOperation(shell);
	operation.copyResources(sources, target);

	return problems;
	}

	/**
	* Performs a resource move
	*/
	private IStatus performResourceMove(IResource[] sources) {
	MultiStatus problems = new MultiStatus(PlatformUI.PLUGIN_ID, 1, "Problems Moving", null); //$NON-NLS-1$
	mergeStatus(problems, validateTarget(getCurrentTarget(), getCurrentTransfer()));

	Object obj = getCurrentTarget();
	IResource res = null;
	if (obj instanceof IAdaptable) {
	res = (IResource)((IAdaptable) obj).getAdapter(IResource.class);
	}
	IContainer target = getActualTarget(res);
	ReadOnlyStateChecker checker = new ReadOnlyStateChecker(
	getShell(),
	"Move Resource Action", //$NON-NLS-1$
	"Move Resource Action");//$NON-NLS-1$
	sources = checker.checkReadOnlyResources(sources);
	MoveFilesAndFoldersOperation operation = new MoveFilesAndFoldersOperation(getShell());
	operation.copyResources(sources, target);

	return problems;
	}

	/* (non-Javadoc)
	* Method declared on IOverWriteQuery
	*/
	public String queryOverwrite(String pathString) {
	final String returnCode[] = {CANCEL};
	final String msg = pathString + " " + CUIPlugin.getResourceString("CViewDragNDrop.txt") ; //$NON-NLS-1$
	final String[] options = {IDialogConstants.YES_LABEL, IDialogConstants.NO_LABEL, IDialogConstants.YES_TO_ALL_LABEL, IDialogConstants.CANCEL_LABEL};
	getDisplay().syncExec(new Runnable() {
	public void run() {
	MessageDialog dialog = new MessageDialog(getShell(), "Question", null, msg, MessageDialog.QUESTION, options, 0); //$NON-NLS-1$
	dialog.open();
	int returnVal = dialog.getReturnCode();
	String[] returnCodes = {YES, NO, ALL, CANCEL};
	returnCode[0] = returnVal < 0 ? CANCEL : returnCodes[returnVal];
	}
	});
	return returnCode[0];
	}

	/**
	* This method is used to notify the action that some aspect of
	* the drop operation has changed.
	*/
	public boolean validateDrop(Object target, int dragOperation, TransferData transferType) {
	if (dragOperation != DND.DROP_NONE) {
	lastValidOperation = dragOperation;
	}
	if (FileTransfer.getInstance().isSupportedType(transferType) &&
	lastValidOperation != DND.DROP_COPY) {
	// only allow copying when dragging from outside Eclipse
	return false;
	}

	if (super.validateDrop(target, dragOperation, transferType)) {
	return true;
	}
	return validateTarget(target, transferType).isOK();
	}

	/**
	* Ensures that the drop target meets certain criteria
	*/
	private IStatus validateTarget(Object target, TransferData transferType) {
	if (target instanceof IAdaptable) {
	IResource r = (IResource)((IAdaptable) target).getAdapter(IResource.class);
	if (r == null)
	return info("Target Must Be Resource"); //$NON-NLS-1$
	target = r;
	}

	if (!(target instanceof IResource)) {
	return info("Target Must Be Resource"); //$NON-NLS-1$
	}
	IResource resource = (IResource) target;
	if (!resource.isAccessible()) {
	return error("Can Not Drop Into Closed Project"); //$NON-NLS-1$
	}
	IContainer destination = getActualTarget(resource);
	if (destination.getType() == IResource.ROOT) {
	return error("Resources Can Not Be Siblings"); //$NON-NLS-1$
	}
	String message = null;
	// drag within Eclipse?
	if (LocalSelectionTransfer.getInstance().isSupportedType(transferType)) {
	IResource[] selectedResources = getSelectedResources();

	if (selectedResources == null)
	message = "Drop Operation Error Other"; //$NON-NLS-1$
	else {
	CopyFilesAndFoldersOperation operation;
	if (lastValidOperation == DND.DROP_COPY) {
	operation = new CopyFilesAndFoldersOperation(getShell());
	}
	else {
	operation = new MoveFilesAndFoldersOperation(getShell());
	}
	message = operation.validateDestination(destination, selectedResources);
	}
	} // file import?
	else if (FileTransfer.getInstance().isSupportedType(transferType)) {
	String[] sourceNames = (String[]) FileTransfer.getInstance().nativeToJava(transferType);
	if (sourceNames == null) {
	// source names will be null on Linux. Use empty names to do destination validation.
	// Fixes bug 29778
	sourceNames = new String[0];
	}
	CopyFilesAndFoldersOperation copyOperation = new CopyFilesAndFoldersOperation(getShell());
	message = copyOperation.validateImportDestination(destination, sourceNames);
	}
	if (message != null) {
	return error(message);
	}
	return ok();
	}


	}