Java tutorial
/******************************************************************************* * Copyright (c) 2000, 2011 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 *******************************************************************************/ package ext.org.eclipse.jdt.internal.ui.packageview; import java.lang.reflect.InvocationTargetException; import java.util.ArrayList; import java.util.HashSet; import java.util.Iterator; import java.util.List; import java.util.Set; import org.eclipse.swt.dnd.DND; import org.eclipse.swt.dnd.DragSourceAdapter; import org.eclipse.swt.dnd.DragSourceEvent; import org.eclipse.swt.dnd.FileTransfer; import org.eclipse.swt.dnd.Transfer; import org.eclipse.swt.widgets.Shell; import org.eclipse.core.runtime.Assert; import org.eclipse.core.runtime.CoreException; import org.eclipse.core.runtime.IAdaptable; import org.eclipse.core.runtime.IProgressMonitor; import org.eclipse.core.runtime.IStatus; import org.eclipse.core.runtime.MultiStatus; import org.eclipse.core.runtime.SubProgressMonitor; import org.eclipse.core.resources.IProject; import org.eclipse.core.resources.IResource; import org.eclipse.jface.dialogs.ProgressMonitorDialog; import org.eclipse.jface.operation.IRunnableWithProgress; import org.eclipse.jface.util.TransferDragSourceListener; import org.eclipse.jface.viewers.ISelection; import org.eclipse.jface.viewers.ISelectionProvider; import org.eclipse.jface.viewers.IStructuredSelection; import org.eclipse.ui.actions.WorkspaceModifyOperation; import org.eclipse.jdt.core.IJavaElement; import org.eclipse.jdt.core.IPackageFragmentRoot; import patch.org.eclipse.jdt.internal.ui.JavaPlugin; import ext.org.eclipse.jdt.internal.corext.util.Resources; import ext.org.eclipse.jdt.internal.ui.util.ExceptionHandler; import ext.org.eclipse.jdt.internal.ui.viewsupport.BasicElementLabels; /** * Drag support class to allow dragging of files and folder from * the packages view to another application. */ public class FileTransferDragAdapter extends DragSourceAdapter implements TransferDragSourceListener { private ISelectionProvider fProvider; public FileTransferDragAdapter(ISelectionProvider provider) { fProvider = provider; Assert.isNotNull(fProvider); } public Transfer getTransfer() { return FileTransfer.getInstance(); } @Override public void dragStart(DragSourceEvent event) { event.doit = isDragable(fProvider.getSelection()); } private boolean isDragable(ISelection s) { if (!(s instanceof IStructuredSelection)) return false; IStructuredSelection selection = (IStructuredSelection) s; for (Iterator<?> iter = selection.iterator(); iter.hasNext();) { Object element = iter.next(); if (element instanceof IJavaElement) { IJavaElement jElement = (IJavaElement) element; int type = jElement.getElementType(); // valid elements are: roots, units and types. Don't allow dragging // projects outside of eclipse if (type != IJavaElement.PACKAGE_FRAGMENT_ROOT && type != IJavaElement.COMPILATION_UNIT && type != IJavaElement.TYPE) return false; IPackageFragmentRoot root = (IPackageFragmentRoot) jElement .getAncestor(IJavaElement.PACKAGE_FRAGMENT_ROOT); if (root != null && (root.isArchive() || root.isExternal())) return false; } else if (element instanceof IProject) { return false; } } List<IResource> resources = convertIntoResources(selection); return resources.size() == selection.size(); } @Override public void dragSetData(DragSourceEvent event) { List<IResource> elements = getResources(); if (elements == null || elements.size() == 0) { event.data = null; return; } event.data = getResourceLocations(elements); } private static String[] getResourceLocations(List<IResource> resources) { return Resources.getLocationOSStrings(resources.toArray(new IResource[resources.size()])); } @Override public void dragFinished(DragSourceEvent event) { if (!event.doit) return; if (event.detail == DND.DROP_MOVE) { // http://bugs.eclipse.org/bugs/show_bug.cgi?id=30543 // handleDropMove(event); } else if (event.detail == DND.DROP_TARGET_MOVE) { handleRefresh(); } } /* package */ void handleDropMove() { final List<IResource> elements = getResources(); if (elements == null || elements.size() == 0) return; WorkspaceModifyOperation op = new WorkspaceModifyOperation() { @Override public void execute(IProgressMonitor monitor) throws CoreException { try { monitor.beginTask(PackagesMessages.DragAdapter_deleting, elements.size()); MultiStatus status = createMultiStatus(); Iterator<IResource> iter = elements.iterator(); while (iter.hasNext()) { IResource resource = iter.next(); try { monitor.subTask(BasicElementLabels.getPathLabel(resource.getFullPath(), true)); resource.delete(true, null); } catch (CoreException e) { status.add(e.getStatus()); } finally { monitor.worked(1); } } if (!status.isOK()) { throw new CoreException(status); } } finally { monitor.done(); } } }; runOperation(op, true, false); } private void handleRefresh() { final Set<IResource> roots = collectRoots(getResources()); WorkspaceModifyOperation op = new WorkspaceModifyOperation() { @Override public void execute(IProgressMonitor monitor) throws CoreException { try { monitor.beginTask(PackagesMessages.DragAdapter_refreshing, roots.size()); MultiStatus status = createMultiStatus(); Iterator<IResource> iter = roots.iterator(); while (iter.hasNext()) { IResource r = iter.next(); try { r.refreshLocal(IResource.DEPTH_ONE, new SubProgressMonitor(monitor, 1)); } catch (CoreException e) { status.add(e.getStatus()); } } if (!status.isOK()) { throw new CoreException(status); } } finally { monitor.done(); } } }; runOperation(op, true, false); } protected Set<IResource> collectRoots(final List<IResource> elements) { final Set<IResource> roots = new HashSet<IResource>(10); Iterator<IResource> iter = elements.iterator(); while (iter.hasNext()) { IResource resource = iter.next(); IResource parent = resource.getParent(); if (parent == null) { roots.add(resource); } else { roots.add(parent); } } return roots; } private List<IResource> getResources() { ISelection s = fProvider.getSelection(); if (!(s instanceof IStructuredSelection)) return null; return convertIntoResources((IStructuredSelection) s); } private List<IResource> convertIntoResources(IStructuredSelection selection) { List<IResource> result = new ArrayList<IResource>(selection.size()); for (Iterator<?> iter = selection.iterator(); iter.hasNext();) { Object o = iter.next(); IResource r = null; if (o instanceof IResource) { r = (IResource) o; } else if (o instanceof IAdaptable) { r = (IResource) ((IAdaptable) o).getAdapter(IResource.class); } // Only add resource for which we have a location // in the local file system. if (r != null && r.getLocation() != null) { result.add(r); } } return result; } private MultiStatus createMultiStatus() { return new MultiStatus(JavaPlugin.getPluginId(), IStatus.OK, PackagesMessages.DragAdapter_problem, null); } private void runOperation(IRunnableWithProgress op, boolean fork, boolean cancelable) { try { Shell parent = JavaPlugin.getActiveWorkbenchShell(); new ProgressMonitorDialog(parent).run(fork, cancelable, op); } catch (InvocationTargetException e) { String message = PackagesMessages.DragAdapter_problem; String title = PackagesMessages.DragAdapter_problemTitle; ExceptionHandler.handle(e, title, message); } catch (InterruptedException e) { // Do nothing. Operation has been canceled by user. } } }