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.util.ArrayList;
  import java.util.Iterator;
  import java.util.List;
  
  import org.eclipse.core.resources.IProject;
  import org.eclipse.core.resources.IWorkspace;
  import org.eclipse.core.resources.ResourcesPlugin;
  import org.eclipse.core.runtime.IAdaptable;
  import org.eclipse.jface.action.IMenuManager;
  import org.eclipse.jface.viewers.ISelection;
  import org.eclipse.jface.viewers.ISelectionChangedListener;
  import org.eclipse.jface.viewers.ISelectionProvider;
  import org.eclipse.jface.viewers.IStructuredSelection;
  import org.eclipse.jface.viewers.SelectionChangedEvent;
  import org.eclipse.jface.viewers.StructuredSelection;
  import org.eclipse.swt.widgets.Shell;
  import org.eclipse.ui.IActionBars;
  import org.eclipse.ui.IViewPart;
  import org.eclipse.ui.IWorkbenchSite;
  import org.eclipse.ui.IWorkingSet;
  import org.eclipse.ui.actions.ActionGroup;
  import org.eclipse.ui.actions.CloseResourceAction;
  import org.eclipse.ui.actions.CloseUnrelatedProjectsAction;
  import org.eclipse.ui.ide.IDEActionFactory;
  import org.eclipse.wst.jsdt.core.IJavaScriptProject;
  import org.eclipse.wst.jsdt.ui.IContextMenuConstants;
  
  /**
   * Adds actions to open and close a project to the global menu bar.
   * 
   * <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 ProjectActionGroup extends ActionGroup {
  
  	private IWorkbenchSite fSite;
  
  	private OpenProjectAction fOpenAction;
  	private CloseResourceAction fCloseAction;
  	private CloseResourceAction fCloseUnrelatedAction;
  	
  	private ISelectionChangedListener fSelectionChangedListener;
  
  	/**
  	 * Creates a new <code>ProjectActionGroup</code>. The group requires
  	 * that the selection provided by the site's selection provider is of type <code>
  	 * org.eclipse.jface.viewers.IStructuredSelection</code>.
  	 * 
  	 * @param part the view part that owns this action group
  	 */
  	public ProjectActionGroup(IViewPart part) {
  		fSite = part.getSite();
  		Shell shell= fSite.getShell();
  		ISelectionProvider provider= fSite.getSelectionProvider();
  		ISelection selection= provider.getSelection();
  		
  		fCloseAction= new CloseResourceAction(shell);
  		fCloseAction.setActionDefinitionId("org.eclipse.ui.project.closeProject"); //$NON-NLS-1$
  		
  		fCloseUnrelatedAction= new CloseUnrelatedProjectsAction(shell);
  		fCloseUnrelatedAction.setActionDefinitionId("org.eclipse.ui.project.closeUnrelatedProjects"); //$NON-NLS-1$
  		
  		fOpenAction= new OpenProjectAction(fSite);
  		fOpenAction.setActionDefinitionId("org.eclipse.ui.project.openProject"); //$NON-NLS-1$
  		if (selection instanceof IStructuredSelection) {
  			IStructuredSelection s= (IStructuredSelection)selection;
  			fOpenAction.selectionChanged(s);
  			fCloseAction.selectionChanged(s);
  			fCloseUnrelatedAction.selectionChanged(s);
  		}
  		
  		fSelectionChangedListener= new ISelectionChangedListener() {
  			public void selectionChanged(SelectionChangedEvent event) {
  				ISelection s= event.getSelection();
  				if (s instanceof IStructuredSelection) {
  					performSelectionChanged((IStructuredSelection) s);
  				}
  			}
  		};
  		provider.addSelectionChangedListener(fSelectionChangedListener);
  
  		IWorkspace workspace= ResourcesPlugin.getWorkspace();
  		workspace.addResourceChangeListener(fOpenAction);
  		workspace.addResourceChangeListener(fCloseAction);
  		workspace.addResourceChangeListener(fCloseUnrelatedAction);
  	}
  	
  	protected void performSelectionChanged(IStructuredSelection structuredSelection) {
  		Object[] array= structuredSelection.toArray();
  		ArrayList openProjects= new ArrayList();
  		int selectionStatus= evaluateSelection(array, openProjects);
  		StructuredSelection sel= new StructuredSelection(openProjects);
  
  		fOpenAction.setEnabled(selectionStatus == CLOSED_PROJECTS_SELECTED || (selectionStatus == 0 && hasClosedProjectsInWorkspace()));
  		fCloseAction.selectionChanged(sel);
  		fCloseUnrelatedAction.selectionChanged(sel);
  	}
  	
  	private int CLOSED_PROJECTS_SELECTED= 1;
  	private int NON_PROJECT_SELECTED= 2;
  
  	private int evaluateSelection(Object[] array, List allOpenProjects) {
  		int status= 0;
  		for (int i= 0; i < array.length; i++) {
  			Object curr= array[i];
  			if (curr instanceof IJavaScriptProject) {
  				curr= ((IJavaScriptProject) curr).getProject();
  			}
  			if (curr instanceof IProject) {
  				IProject project= (IProject) curr;
  				if (project.isOpen()) {
  					allOpenProjects.add(project);
  				} else {
  					status |= CLOSED_PROJECTS_SELECTED;
  				}
  			} else {
  				if (curr instanceof IWorkingSet) {
  					int res= evaluateSelection(((IWorkingSet) curr).getElements(), allOpenProjects);
  					status |= res;
  				} else {
  					status |= NON_PROJECT_SELECTED;
  				}
  			}
  		}
  		return status;
  	}
  		
  	private boolean hasClosedProjectsInWorkspace() {
  		IProject[] projects= ResourcesPlugin.getWorkspace().getRoot().getProjects();
  		for (int i = 0; i < projects.length; i++) {
  			if (!projects[i].isOpen())
  				return true;
  		}
  		return false;
  	}
  	
  	/* (non-Javadoc)
  	 * Method declared in ActionGroup
  	 */
  	public void fillActionBars(IActionBars actionBars) {
  		super.fillActionBars(actionBars);
  		actionBars.setGlobalActionHandler(IDEActionFactory.CLOSE_PROJECT.getId(), fCloseAction);
  		actionBars.setGlobalActionHandler(IDEActionFactory.CLOSE_UNRELATED_PROJECTS.getId(), fCloseUnrelatedAction);
  		actionBars.setGlobalActionHandler(IDEActionFactory.OPEN_PROJECT.getId(), fOpenAction);
  	}
  	
  	/* (non-Javadoc)
  	 * Method declared in ActionGroup
  	 */
  	public void fillContextMenu(IMenuManager menu) {
  		super.fillContextMenu(menu);
  		if (fOpenAction.isEnabled())
  			menu.appendToGroup(IContextMenuConstants.GROUP_BUILD, fOpenAction);
  		if (fCloseAction.isEnabled())
  			menu.appendToGroup(IContextMenuConstants.GROUP_BUILD, fCloseAction);
  		if (fCloseUnrelatedAction.isEnabled() && areOnlyProjectsSelected(fCloseUnrelatedAction.getStructuredSelection()))
  			menu.appendToGroup(IContextMenuConstants.GROUP_BUILD, fCloseUnrelatedAction);
  	}
  	
  	/**
  	 * Returns the open project action contained in this project action group.
  	 * 
  	 * @return returns the open project action
  	 * 
  	 * 
  	 */
  	public OpenProjectAction getOpenProjectAction() {
  		return fOpenAction;
  	}
  
  	private boolean areOnlyProjectsSelected(IStructuredSelection selection) {
  		if (selection.isEmpty())
  			return false;
  		
  		Iterator iter= selection.iterator();
  		while (iter.hasNext()) {
  			Object obj= iter.next();
  			if (obj instanceof IAdaptable) {
  				if (((IAdaptable)obj).getAdapter(IProject.class) == null)
  					return false;
  			}
  		}
  		return true;
  	}
  
  	/*
  	 * @see ActionGroup#dispose()
  	 */
  	public void dispose() {
  		ISelectionProvider provider= fSite.getSelectionProvider();
  		provider.removeSelectionChangedListener(fSelectionChangedListener);
  		
  		IWorkspace workspace = ResourcesPlugin.getWorkspace();
  		workspace.removeResourceChangeListener(fOpenAction);
  		workspace.removeResourceChangeListener(fCloseAction);
  		workspace.removeResourceChangeListener(fCloseUnrelatedAction);
  		super.dispose();
  	}
  }
  