pyresourcedropadapterassistant.java

Python Development Environment (Python IDE plugin for Eclipse). Features editor, code completion, re

    public IStatus handlePluginTransferDrop(IStructuredSelection aDragSelection, Object aDropTarget) {
        aDropTarget = getActual(aDropTarget);

        IContainer target = getActualTarget((IResource) aDropTarget);
        IResource[] resources = getSelectedResources(aDragSelection);

        MoveFilesAndFoldersOperation operation = new MoveFilesAndFoldersOperation(getShell());
        operation.copyResources(resources, target);

        if (target != null && target.isAccessible()) {
            try {
                target.refreshLocal(IResource.DEPTH_ONE, null);
            } catch (CoreException e) {
            }
        }
        return Status.OK_STATUS;
    }

    /**
     * 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 and
     * feedback is enabled, the target is also the parent.
     */
    private IContainer getActualTarget(IResource mouseTarget) {

        /* 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 resource selection from the LocalSelectionTransfer.
     * 
     * @return the resource selection from the LocalSelectionTransfer
     */
    private IResource[] getSelectedResources() {

        ISelection selection = LocalSelectionTransfer.getTransfer().getSelection();
        if (selection instanceof IStructuredSelection) {
            return getSelectedResources((IStructuredSelection) selection);
        }
        return NO_RESOURCES;
    }

    /**
     * Returns the resource selection from the LocalSelectionTransfer.
     * 
     * @return the resource selection from the LocalSelectionTransfer
     */
    private IResource[] getSelectedResources(IStructuredSelection selection) {
        ArrayList selectedResources = new ArrayList();

        for (Iterator i = selection.iterator(); i.hasNext();) {
            Object o = i.next();
            if (o instanceof IResource) {
                selectedResources.add(o);
            } else if (o instanceof IAdaptable) {
                IAdaptable a = (IAdaptable) o;
                IResource r = (IResource) a.getAdapter(IResource.class);
                if (r != null) {
                    selectedResources.add(r);
                }
            }
        }
        return (IResource[]) selectedResources.toArray(new IResource[selectedResources.size()]);
    }

    /**
     * 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);
        operation.copyResources(sources, target);

        return problems;
    }

    /**
     * Performs a resource move
     */
    private IStatus performResourceMove(CommonDropAdapter dropAdapter, 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));
        ReadOnlyStateChecker checker = new ReadOnlyStateChecker(getShell(), WorkbenchNavigatorMessages.MoveResourceAction_title,
                WorkbenchNavigatorMessages.MoveResourceAction_checkMoveMessage);
        sources = checker.checkReadOnlyResources(sources);
        MoveFilesAndFoldersOperation operation = new MoveFilesAndFoldersOperation(getShell());
        operation.copyResources(sources, target);

        return problems;
    }

    private Object getCurrentTarget(CommonDropAdapter dropAdapter) {
        return getActual(dropAdapter.getCurrentTarget());
    }

    /**
     * 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() {
            public void run() {
                getShell().forceActive();
                CopyFilesAndFoldersOperation operation = new CopyFilesAndFoldersOperation(getShell());
                operation.copyFiles(names, target);
            }
        });
        return problems;
    }

    /**
     * Ensures that the drop target meets certain criteria
     */
    private IStatus validateTarget(Object target, TransferData transferType, int dropOperation) {
        target = getActual(target);
        if (!(target instanceof IResource)) {
            return WorkbenchNavigatorPlugin.createInfoStatus(WorkbenchNavigatorMessages.DropAdapter_targetMustBeResource);
        }
        IResource resource = (IResource) target;
        if (!resource.isAccessible()) {
            return WorkbenchNavigatorPlugin.createErrorStatus(WorkbenchNavigatorMessages.DropAdapter_canNotDropIntoClosedProject);
        }
        IContainer destination = getActualTarget(resource);
        if (destination.getType() == IResource.ROOT) {
            return WorkbenchNavigatorPlugin.createErrorStatus(WorkbenchNavigatorMessages.DropAdapter_resourcesCanNotBeSiblings);
        }
        String message = null;
        // drag within Eclipse?
        if (LocalSelectionTransfer.getTransfer().isSupportedType(transferType)) {
            IResource[] selectedResources = getSelectedResources();

            if (selectedResources.length == 0) {
                message = WorkbenchNavigatorMessages.DropAdapter_dropOperationErrorOther;
            } else {
                CopyFilesAndFoldersOperation operation;
                if (dropOperation == 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 WorkbenchNavigatorPlugin.createErrorStatus(message);
        }
        return Status.OK_STATUS;
    }

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

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

        String genericTitle = WorkbenchNavigatorMessages.DropAdapter_title;
        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);
    }

}