/**
 * Performs a drop using the FileTransfer transfer type.
 */
private IStatus performFileDrop(final CommonDropAdapter anAdapter, final Object data) {
	final int currentOperation = anAdapter.getCurrentOperation();
	final MultiStatus problems =
			new MultiStatus(PlatformUI.PLUGIN_ID, 0, WorkbenchNavigatorMessages.DropAdapter_problemImporting, null);
	mergeStatus(problems,
			validateTarget(anAdapter.getCurrentTarget(), anAdapter.getCurrentTransfer(), currentOperation));

	final IContainer target = getActualTarget(ResourceManager.getResource(anAdapter.getCurrentTarget()));
	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(() -> {
		getShell().forceActive();
		new CopyFilesAndFoldersOperation(getShell()).copyOrLinkFiles(names, target, currentOperation);
	});
	return problems;
}
 

/**
 * Performs a drop using the FileTransfer transfer type.
 */
private IStatus performFileDrop(final CommonDropAdapter anAdapter, Object data) {
	final int currentOperation = anAdapter.getCurrentOperation();
	MultiStatus problems = new MultiStatus(PlatformUI.PLUGIN_ID, 0,
			WorkbenchNavigatorMessages.resources_ResourceDropAdapterAssistant_problemImporting, null);
	mergeStatus(problems,
			validateTarget(anAdapter.getCurrentTarget(), anAdapter
					.getCurrentTransfer(), currentOperation));

	final IContainer target = getActualTarget((IResource) anAdapter
			.getCurrentTarget());
	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();
			new CopyFilesAndFoldersOperation(getShell()).copyOrLinkFiles(names, target, currentOperation);
		}
	});
	return problems;
}
 

/**
 * Performs a drop using the FileTransfer transfer type.
 */
private IStatus performFileDrop(final CommonDropAdapter anAdapter, Object data) {
	final int currentOperation = anAdapter.getCurrentOperation();
	MultiStatus problems = new MultiStatus(PlatformUI.PLUGIN_ID, 0,
			WorkbenchNavigatorMessages.resources_ResourceDropAdapterAssistant_problemImporting, null);
	mergeStatus(problems,
			validateTarget(anAdapter.getCurrentTarget(), anAdapter
					.getCurrentTransfer(), currentOperation));

	final IContainer target = getActualTarget((IResource) anAdapter
			.getCurrentTarget());
	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();
			new CopyFilesAndFoldersOperation(getShell()).copyOrLinkFiles(names, target, currentOperation);
		}
	});
	return problems;
}
 

/**
 * Performs a resource copy
 */
private IStatus performResourceCopy(CommonDropAdapter dropAdapter, Shell shell, IResource[] sources) {
    MultiStatus problems = new MultiStatus(PlatformUI.PLUGIN_ID, 1,
            WorkbenchNavigatorMessages.DropAdapter_problemsMoving, null);
    mergeStatus(
            problems,
            validateTarget(getCurrentTarget(dropAdapter), dropAdapter.getCurrentTransfer(),
                    dropAdapter.getCurrentOperation()));

    IContainer target = getActualTarget((IResource) getCurrentTarget(dropAdapter));
    CopyFilesAndFoldersOperation operation = new CopyFilesAndFoldersOperation(shell);
    IResource[] copiedResources = operation.copyResources(sources, target);
    if (copiedResources.length > 0) {
        PythonPathHelper.updatePyPath(copiedResources, target, PythonPathHelper.OPERATION_COPY);
    }

    return problems;
}
 

/**
 * Performs a drop using the FileTransfer transfer type.
 */
private IStatus performFileDrop(CommonDropAdapter anAdapter, Object data) {
    data = getActual(data);
    MultiStatus problems = new MultiStatus(PlatformUI.PLUGIN_ID, 0,
            WorkbenchNavigatorMessages.DropAdapter_problemImporting, null);
    mergeStatus(
            problems,
            validateTarget(getCurrentTarget(anAdapter), anAdapter.getCurrentTransfer(),
                    anAdapter.getCurrentOperation()));

    final IContainer target = getActualTarget((IResource) getCurrentTarget(anAdapter));
    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() {
        @Override
        public void run() {
            getShell().forceActive();
            CopyFilesAndFoldersOperation operation = new CopyFilesAndFoldersOperation(getShell());
            operation.copyFiles(names, target);
        }
    });
    return problems;
}
 

@Override
public void paste(IJavaElement[] javaElements, IResource[] resources, IWorkingSet[] selectedWorkingSets, TransferData[] availableTypes) throws JavaModelException {
	String[] fileData= getClipboardFiles(availableTypes);
	if (fileData == null)
		return;

	IContainer container= getAsContainer(getTarget(javaElements, resources));
	if (container == null)
		return;

	new CopyFilesAndFoldersOperation(getShell()).copyFiles(fileData, container);
}
 

/**
 * {@inheritDoc}
 */
@Override
public boolean performDrop(final Object data) {
	try {
		final int currentOperation= getCurrentOperation();

		if (data == null || !(data instanceof String[]) || currentOperation != DND.DROP_COPY)
			return false;

		final IContainer target= getActualTarget(getCurrentTarget());
		if (target == null)
			return false;

		// Run the import operation asynchronously.
		// Otherwise the drag source (e.g., Windows Explorer) will be blocked
		// while the operation executes. Fixes bug 35796.
		Display.getCurrent().asyncExec(new Runnable() {
			public void run() {
				getShell().forceActive();
				new CopyFilesAndFoldersOperation(getShell()).copyOrLinkFiles((String[])data, target, currentOperation);
			}
		});

		return true;
	} catch (JavaModelException e) {
		String title= PackagesMessages.DropAdapter_errorTitle;
		String message= PackagesMessages.DropAdapter_errorMessage;
		ExceptionHandler.handle(e, getShell(), title, message);
		return false;
	}
}
 

@Override
public IStatus handleDrop(CommonDropAdapter dropAdapter,
		DropTargetEvent event, Object target) {

	try {
		// drop in folder
		if (target instanceof IXdsFolderContainer || 
				target instanceof IProject || 
				target instanceof IContainer ||
				(dropAdapter.getCurrentOperation() == DND.DROP_COPY && (
						target instanceof IFile ||
						target instanceof IXdsResource))) {

			final Object data= event.data;
			if (data == null) {
				return Status.CANCEL_STATUS;
			}
			final IContainer destination= getDestination(target);
			if (destination == null) {
				return Status.CANCEL_STATUS;
			}
			IResource[] resources = null;
			TransferData currentTransfer = dropAdapter.getCurrentTransfer();
			final int dropOperation = dropAdapter.getCurrentOperation();
			if (LocalSelectionTransfer.getTransfer().isSupportedType(
					currentTransfer)) {
				resources = getSelectedResources();
			} else if (ResourceTransfer.getInstance().isSupportedType(
					currentTransfer)) {
				resources = (IResource[]) event.data;
			}
			if (FileTransfer.getInstance().isSupportedType(currentTransfer)) {
				final String[] names = (String[]) data;
				// Run the import operation asynchronously. 
				// Otherwise the drag source (e.g., Windows Explorer) will be blocked 
				Display.getCurrent().asyncExec(new Runnable() {
					public void run() {
						getShell().forceActive();
						CopyFilesAndFoldersOperation op= new CopyFilesAndFoldersOperation(getShell());
						op.copyOrLinkFiles(names, destination, dropOperation);
					}
				});
			} else if (event.detail == DND.DROP_COPY || event.detail == DND.DROP_LINK) {
				return performResourceCopy(dropAdapter, getShell(), resources);
			} else {
				ReadOnlyStateChecker checker = new ReadOnlyStateChecker(
					getShell(), 
					"Move Resource Action",	//$NON-NLS-1$
					"Move Resource Action");//$NON-NLS-1$	
				resources = checker.checkReadOnlyResources(resources);
				MoveFilesAndFoldersOperation operation = new MoveFilesAndFoldersOperation(getShell());
				operation.copyResources(resources, destination);
			}
			return Status.OK_STATUS;
		}
	} 
	finally {
		// The drag source listener must not perform any operation
		// since this drop adapter did the remove of the source even
		// if we moved something.
		event.detail= DND.DROP_NONE;
	}
	return Status.CANCEL_STATUS;
}
 

/**
 * Performs a resource copy.
 * Cloned from ResourceDropAdapterAssistant to support linked resources (bug 319405).
 */
private IStatus performResourceCopy(CommonDropAdapter dropAdapter,
		Shell shell, IResource[] sources) {
	IContainer target = getDestination(dropAdapter.getCurrentTarget());
	if (target == null) {
		return Status.CANCEL_STATUS;
	}
	
	boolean shouldLinkAutomatically = false;
	if (target.isVirtual()) {
		shouldLinkAutomatically = true;
		for (int i = 0; i < sources.length; i++) {
			if ((sources[i].getType() != IResource.FILE) && (sources[i].getLocation() != null)) {
				// If the source is a folder, but the location is null (a
				// broken link, for example),
				// we still generate a link automatically (the best option).
				shouldLinkAutomatically = false;
				break;
			}
		}
	}

	CopyFilesAndFoldersOperation operation = new CopyFilesAndFoldersOperation(shell);
	// if the target is a virtual folder and all sources are files, then
	// automatically create links
	if (shouldLinkAutomatically) {
		operation.setCreateLinks(true);
		operation.copyResources(sources, target);
	} else {
		boolean allSourceAreLinksOrVirtualFolders = true;
		for (int i = 0; i < sources.length; i++) {
			if (!sources[i].isVirtual() && !sources[i].isLinked()) {
				allSourceAreLinksOrVirtualFolders = false;
				break;
			}
		}
		// if all sources are either links or groups, copy then normally,
		// don't show the dialog
		if (!allSourceAreLinksOrVirtualFolders) {
			ImportTypeDialog dialog = new ImportTypeDialog(getShell(), dropAdapter.getCurrentOperation(), sources, target);
			dialog.setResource(target);
			if (dialog.open() == Window.OK) {
				if (dialog.getSelection() == ImportTypeDialog.IMPORT_VIRTUAL_FOLDERS_AND_LINKS)
					operation.setVirtualFolders(true);
				if (dialog.getSelection() == ImportTypeDialog.IMPORT_LINK)
					operation.setCreateLinks(true);
				if (dialog.getVariable() != null)
					operation.setRelativeVariable(dialog.getVariable());
				operation.copyResources(sources, target);
			} else
				return Status.CANCEL_STATUS;
		} else
			operation.copyResources(sources, target);
	}

	return Status.OK_STATUS;
}
 

/**
	 * Performs a resource copy
	 */
	private IStatus performResourceCopy(CommonDropAdapter dropAdapter,
			Shell shell, IResource[] sources) {
		MultiStatus problems = new MultiStatus(PlatformUI.PLUGIN_ID, 1,
				WorkbenchNavigatorMessages.resources_ResourceDropAdapterAssistant_problemsMoving, null);
		mergeStatus(problems, validateTarget(dropAdapter.getCurrentTarget(), dropAdapter.getCurrentTransfer(),
				dropAdapter.getCurrentOperation()));

		IContainer target = getActualTarget((IResource) dropAdapter.getCurrentTarget());

		boolean shouldLinkAutomatically = false;
		if (target.isVirtual()) {
			shouldLinkAutomatically = true;
			for (int i = 0; i < sources.length; i++) {
				if ((sources[i].getType() != IResource.FILE) && (sources[i].getLocation() != null)) {
					// If the source is a folder, but the location is null (a
					// broken link, for example),
					// we still generate a link automatically (the best option).
					shouldLinkAutomatically = false;
					break;
				}
			}
		}

		CopyFilesAndFoldersOperation operation = new CopyFilesAndFoldersOperation(shell);
		// if the target is a virtual folder and all sources are files, then
		// automatically create links
		if (shouldLinkAutomatically) {
			operation.setCreateLinks(true);
			operation.copyResources(sources, target);
		} else {
//			boolean allSourceAreLinksOrVirtualFolders = true;
//			for (int i = 0; i < sources.length; i++) {
//				if (!sources[i].isVirtual() && !sources[i].isLinked()) {
//					allSourceAreLinksOrVirtualFolders = false;
//					break;
//				}
//			}
//			// if all sources are either links or groups, copy then normally,
//			// don't show the dialog
//			if (!allSourceAreLinksOrVirtualFolders) {
//				IPreferenceStore store= IDEWorkbenchPlugin.getDefault().getPreferenceStore();
//				String dndPreference= store.getString(target.isVirtual() ? IDEInternalPreferences.IMPORT_FILES_AND_FOLDERS_VIRTUAL_FOLDER_MODE : IDEInternalPreferences.IMPORT_FILES_AND_FOLDERS_MODE);
//
//				if (dndPreference.equals(IDEInternalPreferences.IMPORT_FILES_AND_FOLDERS_MODE_PROMPT)) {
//					ImportTypeDialog dialog = new ImportTypeDialog(getShell(), dropAdapter.getCurrentOperation(), sources, target);
//					dialog.setResource(target);
//					if (dialog.open() == Window.OK) {
//						if (dialog.getSelection() == ImportTypeDialog.IMPORT_VIRTUAL_FOLDERS_AND_LINKS)
//							operation.setVirtualFolders(true);
//						if (dialog.getSelection() == ImportTypeDialog.IMPORT_LINK)
//							operation.setCreateLinks(true);
//						if (dialog.getVariable() != null)
//							operation.setRelativeVariable(dialog.getVariable());
//						operation.copyResources(sources, target);
//					} else
//						return problems;
//				}
//				else
//					operation.copyResources(sources, target);
//			} else
				operation.copyResources(sources, target);
		}

		return problems;
	}
 

/**
	 * Performs a resource copy
	 */
	private IStatus performResourceCopy(CommonDropAdapter dropAdapter,
			Shell shell, IResource[] sources) {
		MultiStatus problems = new MultiStatus(PlatformUI.PLUGIN_ID, 1,
				WorkbenchNavigatorMessages.resources_ResourceDropAdapterAssistant_problemsMoving, null);
		mergeStatus(problems, validateTarget(dropAdapter.getCurrentTarget(), dropAdapter.getCurrentTransfer(),
				dropAdapter.getCurrentOperation()));

		IContainer target = getActualTarget((IResource) dropAdapter.getCurrentTarget());

		boolean shouldLinkAutomatically = false;
		if (target.isVirtual()) {
			shouldLinkAutomatically = true;
			for (int i = 0; i < sources.length; i++) {
				if ((sources[i].getType() != IResource.FILE) && (sources[i].getLocation() != null)) {
					// If the source is a folder, but the location is null (a
					// broken link, for example),
					// we still generate a link automatically (the best option).
					shouldLinkAutomatically = false;
					break;
				}
			}
		}

		CopyFilesAndFoldersOperation operation = new CopyFilesAndFoldersOperation(shell);
		// if the target is a virtual folder and all sources are files, then
		// automatically create links
		if (shouldLinkAutomatically) {
			operation.setCreateLinks(true);
			operation.copyResources(sources, target);
		} else {
//			boolean allSourceAreLinksOrVirtualFolders = true;
//			for (int i = 0; i < sources.length; i++) {
//				if (!sources[i].isVirtual() && !sources[i].isLinked()) {
//					allSourceAreLinksOrVirtualFolders = false;
//					break;
//				}
//			}
//			// if all sources are either links or groups, copy then normally,
//			// don't show the dialog
//			if (!allSourceAreLinksOrVirtualFolders) {
//				IPreferenceStore store= IDEWorkbenchPlugin.getDefault().getPreferenceStore();
//				String dndPreference= store.getString(target.isVirtual() ? IDEInternalPreferences.IMPORT_FILES_AND_FOLDERS_VIRTUAL_FOLDER_MODE : IDEInternalPreferences.IMPORT_FILES_AND_FOLDERS_MODE);
//
//				if (dndPreference.equals(IDEInternalPreferences.IMPORT_FILES_AND_FOLDERS_MODE_PROMPT)) {
//					ImportTypeDialog dialog = new ImportTypeDialog(getShell(), dropAdapter.getCurrentOperation(), sources, target);
//					dialog.setResource(target);
//					if (dialog.open() == Window.OK) {
//						if (dialog.getSelection() == ImportTypeDialog.IMPORT_VIRTUAL_FOLDERS_AND_LINKS)
//							operation.setVirtualFolders(true);
//						if (dialog.getSelection() == ImportTypeDialog.IMPORT_LINK)
//							operation.setCreateLinks(true);
//						if (dialog.getVariable() != null)
//							operation.setRelativeVariable(dialog.getVariable());
//						operation.copyResources(sources, target);
//					} else
//						return problems;
//				}
//				else
//					operation.copyResources(sources, target);
//			} else
				operation.copyResources(sources, target);
		}

		return problems;
	}