content: /*******************************************************************************
   * Copyright (c) 2000, 2008 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 org.eclipse.wst.jsdt.ui.actions;
  
  import java.lang.reflect.InvocationTargetException;
  import java.net.URI;
  import java.util.ArrayList;
  import java.util.Iterator;
  import java.util.List;
  
  import org.eclipse.core.filesystem.EFS;
  import org.eclipse.core.filesystem.IFileStore;
  import org.eclipse.core.resources.IProject;
  import org.eclipse.core.resources.IResource;
  import org.eclipse.core.resources.IWorkspaceRoot;
  import org.eclipse.core.resources.IWorkspaceRunnable;
  import org.eclipse.core.resources.ResourcesPlugin;
  import org.eclipse.core.runtime.CoreException;
  import org.eclipse.core.runtime.IAdaptable;
  import org.eclipse.core.runtime.IProgressMonitor;
  import org.eclipse.core.runtime.SubProgressMonitor;
  import org.eclipse.jface.dialogs.MessageDialog;
  import org.eclipse.jface.viewers.IStructuredSelection;
  import org.eclipse.ui.IWorkbenchSite;
  import org.eclipse.ui.IWorkingSet;
  import org.eclipse.ui.PlatformUI;
  import org.eclipse.wst.jsdt.core.IJavaScriptElement;
  import org.eclipse.wst.jsdt.core.IJavaScriptModel;
  import org.eclipse.wst.jsdt.core.JavaScriptCore;
  import org.eclipse.wst.jsdt.internal.corext.util.Messages;
  import org.eclipse.wst.jsdt.internal.corext.util.Resources;
  import org.eclipse.wst.jsdt.internal.ui.IJavaHelpContextIds;
  import org.eclipse.wst.jsdt.internal.ui.JavaPluginImages;
  import org.eclipse.wst.jsdt.internal.ui.actions.ActionMessages;
  import org.eclipse.wst.jsdt.internal.ui.actions.WorkbenchRunnableAdapter;
  import org.eclipse.wst.jsdt.internal.ui.util.ExceptionHandler;
  
  /**
   * Action for refreshing the workspace from the local file system for
   * the selected resources and all of their descendants. This action
   * also considers external Jars managed by the JavaScript Model.
   * <p>
   * Action is applicable to selections containing resources and Java
   * elements down to compilation units.
   * 
   * <p>
   * This class may be instantiated; it is not intended to be subclassed.
   * </p>
   *
   * Provisional API: This class/interface is part of an interim API that is still under development and expected to
   * change significantly before reaching stability. It is being made available at this early stage to solicit feedback
   * from pioneering adopters on the understanding that any code that uses this API will almost certainly be broken
   * (repeatedly) as the API evolves.
   */
  public class RefreshAction extends SelectionDispatchAction {
  
  	/**
  	 * Creates a new <code>RefreshAction</code>. The action requires
  	 * that the selection provided by the site's selection provider is of type <code>
  	 * org.eclipse.jface.viewers.IStructuredSelection</code>.
  	 * 
  	 * @param site the site providing context information for this action
  	 */
  	public RefreshAction(IWorkbenchSite site) {
  		super(site);
  		setText(ActionMessages.RefreshAction_label); 
  		setToolTipText(ActionMessages.RefreshAction_toolTip); 
  		JavaPluginImages.setLocalImageDescriptors(this, "refresh_nav.gif");//$NON-NLS-1$
  		PlatformUI.getWorkbench().getHelpSystem().setHelp(this, IJavaHelpContextIds.REFRESH_ACTION);
  	}
  	
  	/* (non-Javadoc)
  	 * Method declared in SelectionDispatchAction
  	 */
  	public void selectionChanged(IStructuredSelection selection) {
  		setEnabled(checkEnabled(selection));
  	}
  
  	private boolean checkEnabled(IStructuredSelection selection) {
  		if (selection.isEmpty())
  			return true;
  		for (Iterator iter= selection.iterator(); iter.hasNext();) {
  			Object element= iter.next();
  			if (element instanceof IWorkingSet) {
  				// don't inspect working sets any deeper.
  			} else if (element instanceof IAdaptable) {
  				IResource resource= (IResource)((IAdaptable)element).getAdapter(IResource.class);
  				if (resource == null)
  					return false;
  				if (resource.getType() == IResource.PROJECT && !((IProject)resource).isOpen())
  					return false;
  			} else {
  				return false;
  			}
  		}
  		return true;
  	}
  
  	/* (non-Javadoc)
  	 * Method declared in SelectionDispatchAction
  	 */
  	public void run(IStructuredSelection selection) {
  		final IResource[] resources= getResources(selection);
  		IWorkspaceRunnable operation= new IWorkspaceRunnable() {
  			public void run(IProgressMonitor monitor) throws CoreException {
  				monitor.beginTask(ActionMessages.RefreshAction_progressMessage, resources.length * 2); 
  				monitor.subTask(""); //$NON-NLS-1$
  				List javaElements= new ArrayList(5);
  				for (int r= 0; r < resources.length; r++) {
  					IResource resource= resources[r];
  					if (resource.getType() == IResource.PROJECT) {
  						checkLocationDeleted((IProject) resource);
  					} else if (resource.getType() == IResource.ROOT) {
  						IProject[] projects = ((IWorkspaceRoot)resource).getProjects();
  						for (int p = 0; p < projects.length; p++) {
  							checkLocationDeleted(projects[p]);
  						}
  					}
  					resource.refreshLocal(IResource.DEPTH_INFINITE, new SubProgressMonitor(monitor, 1));
  					IJavaScriptElement jElement= JavaScriptCore.create(resource);
  					if (jElement != null && jElement.exists())
  						javaElements.add(jElement);
  				}
  				IJavaScriptModel model= JavaScriptCore.create(ResourcesPlugin.getWorkspace().getRoot());
  				model.refreshExternalArchives(
  					(IJavaScriptElement[]) javaElements.toArray(new IJavaScriptElement[javaElements.size()]),
  					new SubProgressMonitor(monitor, resources.length));
  			}
  		};
  		
  		try {
  			PlatformUI.getWorkbench().getProgressService().run(true, true, new WorkbenchRunnableAdapter(operation));
  		} catch (InvocationTargetException e) {
  			ExceptionHandler.handle(e, getShell(), 
  				ActionMessages.RefreshAction_error_title,  
  				ActionMessages.RefreshAction_error_message); 
  		} catch (InterruptedException e) {
  			// canceled
  		}
  	}
  	
  	private IResource[] getResources(IStructuredSelection selection) {
  		if (selection.isEmpty()) {
  			return new IResource[] {ResourcesPlugin.getWorkspace().getRoot()};
  		}
  		
  		List result= new ArrayList(selection.size());
  		getResources(result, selection.toArray());
  		
  		for (Iterator iter= result.iterator(); iter.hasNext();) {
  			IResource resource= (IResource) iter.next();
  			if (isDescendent(result, resource))
  				iter.remove();			
  		}
  		
  		return (IResource[]) result.toArray(new IResource[result.size()]);
  	}
  	
  	private void getResources(List result, Object[] elements) {
  		for (int i= 0; i < elements.length; i++) {
  			Object element= elements[i];
  			// Must check working set before IAdaptable since WorkingSet
  			// implements IAdaptable
  			if (element instanceof IWorkingSet) {
  				getResources(result, ((IWorkingSet)element).getElements());
  			} else if (element instanceof IAdaptable) {
  				IResource resource= (IResource)((IAdaptable)element).getAdapter(IResource.class);
  				if (resource == null)
  					continue;
  				if (resource.getType() != IResource.PROJECT  || 
  						(resource.getType() == IResource.PROJECT && ((IProject)resource).isOpen())) {
  					result.add(resource);
  				}
  			}
  		}
  	}
  	
  	private boolean isDescendent(List candidates, IResource element) {
  		IResource parent= element.getParent();
  		while (parent != null) {
  			if (candidates.contains(parent))
  				return true;
  			parent= parent.getParent();
  		}
  		return false;
  	}
  	
  	private void checkLocationDeleted(IProject project) throws CoreException {
  		if (!project.exists())
  			return;
  		URI location= project.getLocationURI();
  		if (location == null)
  			return;
  		IFileStore store= EFS.getStore(location);
  		if (!store.fetchInfo().exists()) {
  			final String message = Messages.format(
  				ActionMessages.RefreshAction_locationDeleted_message, 
  				new Object[] { project.getName(), Resources.getLocationString(project) });
  			final boolean[] result= new boolean[1];
  			// Must prompt user in UI thread (we're in the operation thread here).
  			getShell().getDisplay().syncExec(new Runnable() {
  				public void run() {
  					result[0]= MessageDialog.openQuestion(getShell(), 
  						ActionMessages.RefreshAction_locationDeleted_title, 
  						message);
  				}
  			});
  			if (result[0]) { 
  				project.delete(true, true, null);
  			}
  		}
  	}	
  }
  