org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/wizards/buildpaths/newsourcepage/AddFolderToBuildpathAction.java - jdt/eclipse.jdt.ui - Git at Google

 /*******************************************************************************
  * Copyright (c) 2000, 2006 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.jdt.internal.ui.wizards.buildpaths.newsourcepage;

 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.core.runtime.CoreException;
 import org.eclipse.core.runtime.IPath;
 import org.eclipse.core.runtime.IProgressMonitor;
 import org.eclipse.core.runtime.IStatus;
 import org.eclipse.core.runtime.OperationCanceledException;
 import org.eclipse.core.runtime.SubProgressMonitor;

 import org.eclipse.core.resources.IContainer;
 import org.eclipse.core.resources.IFolder;
 import org.eclipse.core.resources.IProject;
 import org.eclipse.core.resources.IResource;
 import org.eclipse.core.resources.IWorkspaceRoot;

 import org.eclipse.swt.widgets.Shell;

 import org.eclipse.jface.action.Action;
 import org.eclipse.jface.dialogs.ErrorDialog;
 import org.eclipse.jface.dialogs.IDialogConstants;
 import org.eclipse.jface.dialogs.MessageDialog;
 import org.eclipse.jface.operation.IRunnableWithProgress;
 import org.eclipse.jface.viewers.ISelection;
 import org.eclipse.jface.viewers.ISelectionChangedListener;
 import org.eclipse.jface.viewers.IStructuredSelection;
 import org.eclipse.jface.viewers.SelectionChangedEvent;
 import org.eclipse.jface.viewers.StructuredSelection;

 import org.eclipse.ui.IWorkbenchPage;
 import org.eclipse.ui.IWorkbenchPart;
 import org.eclipse.ui.IWorkbenchPartReference;
 import org.eclipse.ui.IWorkbenchSite;
 import org.eclipse.ui.PlatformUI;
 import org.eclipse.ui.part.ISetSelectionTarget;

 import org.eclipse.jdt.core.IClasspathEntry;
 import org.eclipse.jdt.core.IJavaElement;
 import org.eclipse.jdt.core.IJavaProject;
 import org.eclipse.jdt.core.IPackageFragment;
 import org.eclipse.jdt.core.JavaCore;

 import org.eclipse.jdt.internal.corext.buildpath.ClasspathModifier;
 import org.eclipse.jdt.internal.corext.util.Messages;

 import org.eclipse.jdt.internal.ui.JavaPlugin;
 import org.eclipse.jdt.internal.ui.JavaPluginImages;
 import org.eclipse.jdt.internal.ui.dialogs.StatusInfo;
 import org.eclipse.jdt.internal.ui.wizards.NewWizardMessages;
 import org.eclipse.jdt.internal.ui.wizards.buildpaths.BuildPathBasePage;
 import org.eclipse.jdt.internal.ui.wizards.buildpaths.BuildPathsBlock;
 import org.eclipse.jdt.internal.ui.wizards.buildpaths.CPListElement;
 import org.eclipse.jdt.internal.ui.wizards.buildpaths.newsourcepage.ClasspathModifierQueries.OutputFolderQuery;

 public class AddFolderToBuildpathAction extends Action implements ISelectionChangedListener {

 	private final IWorkbenchSite fSite;
 	private final List fSelectedElements; //IJavaProject || IPackageFrament || IFolder

 	public AddFolderToBuildpathAction(IWorkbenchSite site) {
 		super(NewWizardMessages.NewSourceContainerWorkbookPage_ToolBar_AddSelSFToCP_label, JavaPluginImages.DESC_OBJS_PACKFRAG_ROOT);
 		setToolTipText(NewWizardMessages.NewSourceContainerWorkbookPage_ToolBar_AddSelSFToCP_tooltip);
 		fSite= site;
 		fSelectedElements= new ArrayList();
 	}

 	/**
 	 * {@inheritDoc}
 	 */
 	public void run() {

 		try {
 			final IJavaProject project;
 			Object object= fSelectedElements.get(0);
 			if (object instanceof IJavaProject) {
 				project= (IJavaProject)object;
 			} else if (object instanceof IPackageFragment) {
 				project= ((IPackageFragment)object).getJavaProject();
 			} else {
 				IFolder folder= (IFolder)object;
 				project= JavaCore.create(folder.getProject());
 				if (project == null)
 					return;
 			}

 			final Shell shell= fSite.getShell() != null ? fSite.getShell() : JavaPlugin.getActiveWorkbenchShell();

 			final boolean removeProjectFromClasspath;
 			IPath outputLocation= project.getOutputLocation();
 			final IPath defaultOutputLocation= outputLocation.makeRelative();
 			final IPath newDefaultOutputLocation;
 			final boolean removeOldClassFiles;
 			IPath projPath= project.getProject().getFullPath();
 			if (!(fSelectedElements.size() == 1 && fSelectedElements.get(0) instanceof IJavaProject) && //if only the project should be added, then the query does not need to be executed
 					(outputLocation.equals(projPath) || defaultOutputLocation.segmentCount() == 1)) {


 				final OutputFolderQuery outputFolderQuery= ClasspathModifierQueries.getDefaultFolderQuery(shell, defaultOutputLocation);
 				if (outputFolderQuery.doQuery(true, ClasspathModifier.getValidator(fSelectedElements, project), project)) {
 					newDefaultOutputLocation= outputFolderQuery.getOutputLocation();
 					removeProjectFromClasspath= outputFolderQuery.removeProjectFromClasspath();

 					if (BuildPathsBlock.hasClassfiles(project.getProject()) && outputLocation.equals(projPath)) {
 						String title= NewWizardMessages.BuildPathsBlock_RemoveBinariesDialog_title;
 						String message= Messages.format(NewWizardMessages.BuildPathsBlock_RemoveBinariesDialog_description, projPath.toString());
 						MessageDialog dialog= new MessageDialog(shell, title, null, message, MessageDialog.QUESTION, new String[] { IDialogConstants.YES_LABEL, IDialogConstants.NO_LABEL, IDialogConstants.CANCEL_LABEL }, 0);
 						int answer= dialog.open();
 						if (answer == 0) {
 							removeOldClassFiles= true;
 						} else if (answer == 1) {
 							removeOldClassFiles= false;
 						} else {
 							return;
 						}
 					} else {
 						removeOldClassFiles= false;
 					}
 				} else {
 					return;
 				}
 			} else {
 				removeProjectFromClasspath= false;
 				removeOldClassFiles= false;
 				newDefaultOutputLocation= defaultOutputLocation;
 			}

 			try {
 				final IRunnableWithProgress runnable= new IRunnableWithProgress() {
 					public void run(IProgressMonitor monitor) throws InvocationTargetException, InterruptedException {
 						try {
 							List result= addToClasspath(fSelectedElements, project, newDefaultOutputLocation.makeAbsolute(), removeProjectFromClasspath, removeOldClassFiles, monitor);
 							selectAndReveal(new StructuredSelection(result));
 						} catch (CoreException e) {
 							throw new InvocationTargetException(e);
 						}
 					}
 				};
 				PlatformUI.getWorkbench().getProgressService().run(true, false, runnable);
 			} catch (final InvocationTargetException e) {
 				if (e.getCause() instanceof CoreException) {
 					showExceptionDialog((CoreException)e.getCause());
 				} else {
 					JavaPlugin.log(e);
 				}
 			} catch (final InterruptedException e) {
 			}
 		} catch (CoreException e) {
 			showExceptionDialog(e);
 		}
 	}

 	private List addToClasspath(List elements, IJavaProject project, IPath outputLocation, boolean removeProjectFromClasspath, boolean removeOldClassFiles, IProgressMonitor monitor) throws OperationCanceledException, CoreException {
 		if (!project.getProject().hasNature(JavaCore.NATURE_ID)) {
 			StatusInfo rootStatus= new StatusInfo();
 			rootStatus.setError(NewWizardMessages.ClasspathModifier_Error_NoNatures);
 			throw new CoreException(rootStatus);
 		}

 		try {
 			monitor.beginTask(NewWizardMessages.ClasspathModifier_Monitor_AddToBuildpath, elements.size() + 4);
 			IWorkspaceRoot workspaceRoot= JavaPlugin.getWorkspace().getRoot();

 			if (removeOldClassFiles) {
 				IResource res= workspaceRoot.findMember(project.getOutputLocation());
 				if (res instanceof IContainer && BuildPathsBlock.hasClassfiles(res)) {
 					BuildPathsBlock.removeOldClassfiles(res);
 				}
 			}

 			if (!project.getOutputLocation().equals(outputLocation)) {
 				project.setOutputLocation(outputLocation, new SubProgressMonitor(monitor, 1));
 			} else {
 				monitor.worked(1);
 			}

 			List existingEntries= ClasspathModifier.getExistingEntries(project);
 			if (removeProjectFromClasspath) {
 				ClasspathModifier.removeFromClasspath(project, existingEntries, new SubProgressMonitor(monitor, 1));
 			} else {
 				monitor.worked(1);
 			}

 			List newEntries= new ArrayList();
 			for (int i= 0; i < elements.size(); i++) {
 				Object element= elements.get(i);
 				CPListElement entry;
 				if (element instanceof IResource)
 					entry= ClasspathModifier.addToClasspath((IResource) element, existingEntries, newEntries, project, new SubProgressMonitor(monitor, 1));
 				else
 					entry= ClasspathModifier.addToClasspath((IJavaElement) element, existingEntries, newEntries, project, new SubProgressMonitor(monitor, 1));
 				newEntries.add(entry);
 			}

 			Set modifiedSourceEntries= new HashSet();
 			BuildPathBasePage.fixNestingConflicts((CPListElement[])newEntries.toArray(new CPListElement[newEntries.size()]), (CPListElement[])existingEntries.toArray(new CPListElement[existingEntries.size()]), modifiedSourceEntries);

 			ClasspathModifier.setNewEntry(existingEntries, newEntries, project, new SubProgressMonitor(monitor, 1));

 			ClasspathModifier.commitClassPath(existingEntries, project, new SubProgressMonitor(monitor, 1));

 			List result= new ArrayList();
 			for (int i= 0; i < newEntries.size(); i++) {
 				IClasspathEntry entry= ((CPListElement) newEntries.get(i)).getClasspathEntry();
 				IJavaElement root;
 				if (entry.getPath().equals(project.getPath()))
 					root= project;
 				else
 					root= project.findPackageFragmentRoot(entry.getPath());
 				if (root != null) {
 					result.add(root);
 				}
 			}

 			return result;
 		} finally {
 			monitor.done();
 		}
 	}

 	/**
 	 * {@inheritDoc}
 	 */
 	public void selectionChanged(final SelectionChangedEvent event) {
 		final ISelection selection = event.getSelection();
 		if (selection instanceof IStructuredSelection) {
 			setEnabled(canHandle((IStructuredSelection) selection));
 		} else {
 			setEnabled(canHandle(StructuredSelection.EMPTY));
 		}
 	}

 	private boolean canHandle(IStructuredSelection elements) {
 		if (elements.size() == 0)
 			return false;
 		try {
 			fSelectedElements.clear();
 			for (Iterator iter= elements.iterator(); iter.hasNext();) {
 				Object element= iter.next();
 				fSelectedElements.add(element);
 				if (element instanceof IJavaProject) {
 					if (ClasspathModifier.isSourceFolder((IJavaProject)element))
 						return false;
 				} else if (element instanceof IPackageFragment) {
 					int type= DialogPackageExplorerActionGroup.getType(element, ((IPackageFragment)element).getJavaProject());
 					if (type != DialogPackageExplorerActionGroup.PACKAGE_FRAGMENT && type != DialogPackageExplorerActionGroup.INCLUDED_FOLDER)
 						return false;
 				} else if (element instanceof IFolder) {
 					IProject project= ((IFolder)element).getProject();
 					IJavaProject javaProject= JavaCore.create(project);
 					if (javaProject == null || !javaProject.exists())
 						return false;
 				} else {
 					return false;
 				}
 			}
 			return true;
 		} catch (CoreException e) {
 		}
 		return false;
 	}

 	private void showExceptionDialog(CoreException exception) {
 		showError(exception, fSite.getShell(), NewWizardMessages.AddSourceFolderToBuildpathAction_ErrorTitle, exception.getMessage());
 	}

 	private void showError(CoreException e, Shell shell, String title, String message) {
 		IStatus status= e.getStatus();
 		if (status != null) {
 			ErrorDialog.openError(shell, message, title, status);
 		} else {
 			MessageDialog.openError(shell, title, message);
 		}
 	}

 	private void selectAndReveal(final ISelection selection) {
 		// validate the input
 		IWorkbenchPage page= fSite.getPage();
 		if (page == null)
 			return;

 		// get all the view and editor parts
 		List parts= new ArrayList();
 		IWorkbenchPartReference refs[]= page.getViewReferences();
 		for (int i= 0; i < refs.length; i++) {
 			IWorkbenchPart part= refs[i].getPart(false);
 			if (part != null)
 				parts.add(part);
 		}
 		refs= page.getEditorReferences();
 		for (int i= 0; i < refs.length; i++) {
 			if (refs[i].getPart(false) != null)
 				parts.add(refs[i].getPart(false));
 		}

 		Iterator itr= parts.iterator();
 		while (itr.hasNext()) {
 			IWorkbenchPart part= (IWorkbenchPart) itr.next();

 			// get the part's ISetSelectionTarget implementation
 			ISetSelectionTarget target= null;
 			if (part instanceof ISetSelectionTarget)
 				target= (ISetSelectionTarget) part;
 			else
 				target= (ISetSelectionTarget) part.getAdapter(ISetSelectionTarget.class);

 			if (target != null) {
 				// select and reveal resource
 				final ISetSelectionTarget finalTarget= target;
 				page.getWorkbenchWindow().getShell().getDisplay().asyncExec(new Runnable() {
 					public void run() {
 						finalTarget.selectReveal(selection);
 					}
 				});
 			}
 		}
 	}

 }
	/*******************************************************************************
	* Copyright (c) 2000, 2006 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.jdt.internal.ui.wizards.buildpaths.newsourcepage;

	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.core.runtime.CoreException;
	import org.eclipse.core.runtime.IPath;
	import org.eclipse.core.runtime.IProgressMonitor;
	import org.eclipse.core.runtime.IStatus;
	import org.eclipse.core.runtime.OperationCanceledException;
	import org.eclipse.core.runtime.SubProgressMonitor;

	import org.eclipse.core.resources.IContainer;
	import org.eclipse.core.resources.IFolder;
	import org.eclipse.core.resources.IProject;
	import org.eclipse.core.resources.IResource;
	import org.eclipse.core.resources.IWorkspaceRoot;

	import org.eclipse.swt.widgets.Shell;

	import org.eclipse.jface.action.Action;
	import org.eclipse.jface.dialogs.ErrorDialog;
	import org.eclipse.jface.dialogs.IDialogConstants;
	import org.eclipse.jface.dialogs.MessageDialog;
	import org.eclipse.jface.operation.IRunnableWithProgress;
	import org.eclipse.jface.viewers.ISelection;
	import org.eclipse.jface.viewers.ISelectionChangedListener;
	import org.eclipse.jface.viewers.IStructuredSelection;
	import org.eclipse.jface.viewers.SelectionChangedEvent;
	import org.eclipse.jface.viewers.StructuredSelection;

	import org.eclipse.ui.IWorkbenchPage;
	import org.eclipse.ui.IWorkbenchPart;
	import org.eclipse.ui.IWorkbenchPartReference;
	import org.eclipse.ui.IWorkbenchSite;
	import org.eclipse.ui.PlatformUI;
	import org.eclipse.ui.part.ISetSelectionTarget;

	import org.eclipse.jdt.core.IClasspathEntry;
	import org.eclipse.jdt.core.IJavaElement;
	import org.eclipse.jdt.core.IJavaProject;
	import org.eclipse.jdt.core.IPackageFragment;
	import org.eclipse.jdt.core.JavaCore;

	import org.eclipse.jdt.internal.corext.buildpath.ClasspathModifier;
	import org.eclipse.jdt.internal.corext.util.Messages;

	import org.eclipse.jdt.internal.ui.JavaPlugin;
	import org.eclipse.jdt.internal.ui.JavaPluginImages;
	import org.eclipse.jdt.internal.ui.dialogs.StatusInfo;
	import org.eclipse.jdt.internal.ui.wizards.NewWizardMessages;
	import org.eclipse.jdt.internal.ui.wizards.buildpaths.BuildPathBasePage;
	import org.eclipse.jdt.internal.ui.wizards.buildpaths.BuildPathsBlock;
	import org.eclipse.jdt.internal.ui.wizards.buildpaths.CPListElement;
	import org.eclipse.jdt.internal.ui.wizards.buildpaths.newsourcepage.ClasspathModifierQueries.OutputFolderQuery;

	public class AddFolderToBuildpathAction extends Action implements ISelectionChangedListener {

	private final IWorkbenchSite fSite;
	private final List fSelectedElements; //IJavaProject \|\| IPackageFrament \|\| IFolder

	public AddFolderToBuildpathAction(IWorkbenchSite site) {
	super(NewWizardMessages.NewSourceContainerWorkbookPage_ToolBar_AddSelSFToCP_label, JavaPluginImages.DESC_OBJS_PACKFRAG_ROOT);
	setToolTipText(NewWizardMessages.NewSourceContainerWorkbookPage_ToolBar_AddSelSFToCP_tooltip);
	fSite= site;
	fSelectedElements= new ArrayList();
	}

	/**
	* {@inheritDoc}
	*/
	public void run() {

	try {
	final IJavaProject project;
	Object object= fSelectedElements.get(0);
	if (object instanceof IJavaProject) {
	project= (IJavaProject)object;
	} else if (object instanceof IPackageFragment) {
	project= ((IPackageFragment)object).getJavaProject();
	} else {
	IFolder folder= (IFolder)object;
	project= JavaCore.create(folder.getProject());
	if (project == null)
	return;
	}

	final Shell shell= fSite.getShell() != null ? fSite.getShell() : JavaPlugin.getActiveWorkbenchShell();

	final boolean removeProjectFromClasspath;
	IPath outputLocation= project.getOutputLocation();
	final IPath defaultOutputLocation= outputLocation.makeRelative();
	final IPath newDefaultOutputLocation;
	final boolean removeOldClassFiles;
	IPath projPath= project.getProject().getFullPath();
	if (!(fSelectedElements.size() == 1 && fSelectedElements.get(0) instanceof IJavaProject) && //if only the project should be added, then the query does not need to be executed
	(outputLocation.equals(projPath) \|\| defaultOutputLocation.segmentCount() == 1)) {


	final OutputFolderQuery outputFolderQuery= ClasspathModifierQueries.getDefaultFolderQuery(shell, defaultOutputLocation);
	if (outputFolderQuery.doQuery(true, ClasspathModifier.getValidator(fSelectedElements, project), project)) {
	newDefaultOutputLocation= outputFolderQuery.getOutputLocation();
	removeProjectFromClasspath= outputFolderQuery.removeProjectFromClasspath();

	if (BuildPathsBlock.hasClassfiles(project.getProject()) && outputLocation.equals(projPath)) {
	String title= NewWizardMessages.BuildPathsBlock_RemoveBinariesDialog_title;
	String message= Messages.format(NewWizardMessages.BuildPathsBlock_RemoveBinariesDialog_description, projPath.toString());
	MessageDialog dialog= new MessageDialog(shell, title, null, message, MessageDialog.QUESTION, new String[] { IDialogConstants.YES_LABEL, IDialogConstants.NO_LABEL, IDialogConstants.CANCEL_LABEL }, 0);
	int answer= dialog.open();
	if (answer == 0) {
	removeOldClassFiles= true;
	} else if (answer == 1) {
	removeOldClassFiles= false;
	} else {
	return;
	}
	} else {
	removeOldClassFiles= false;
	}
	} else {
	return;
	}
	} else {
	removeProjectFromClasspath= false;
	removeOldClassFiles= false;
	newDefaultOutputLocation= defaultOutputLocation;
	}

	try {
	final IRunnableWithProgress runnable= new IRunnableWithProgress() {
	public void run(IProgressMonitor monitor) throws InvocationTargetException, InterruptedException {
	try {
	List result= addToClasspath(fSelectedElements, project, newDefaultOutputLocation.makeAbsolute(), removeProjectFromClasspath, removeOldClassFiles, monitor);
	selectAndReveal(new StructuredSelection(result));
	} catch (CoreException e) {
	throw new InvocationTargetException(e);
	}
	}
	};
	PlatformUI.getWorkbench().getProgressService().run(true, false, runnable);
	} catch (final InvocationTargetException e) {
	if (e.getCause() instanceof CoreException) {
	showExceptionDialog((CoreException)e.getCause());
	} else {
	JavaPlugin.log(e);
	}
	} catch (final InterruptedException e) {
	}
	} catch (CoreException e) {
	showExceptionDialog(e);
	}
	}

	private List addToClasspath(List elements, IJavaProject project, IPath outputLocation, boolean removeProjectFromClasspath, boolean removeOldClassFiles, IProgressMonitor monitor) throws OperationCanceledException, CoreException {
	if (!project.getProject().hasNature(JavaCore.NATURE_ID)) {
	StatusInfo rootStatus= new StatusInfo();
	rootStatus.setError(NewWizardMessages.ClasspathModifier_Error_NoNatures);
	throw new CoreException(rootStatus);
	}

	try {
	monitor.beginTask(NewWizardMessages.ClasspathModifier_Monitor_AddToBuildpath, elements.size() + 4);
	IWorkspaceRoot workspaceRoot= JavaPlugin.getWorkspace().getRoot();

	if (removeOldClassFiles) {
	IResource res= workspaceRoot.findMember(project.getOutputLocation());
	if (res instanceof IContainer && BuildPathsBlock.hasClassfiles(res)) {
	BuildPathsBlock.removeOldClassfiles(res);
	}
	}

	if (!project.getOutputLocation().equals(outputLocation)) {
	project.setOutputLocation(outputLocation, new SubProgressMonitor(monitor, 1));
	} else {
	monitor.worked(1);
	}

	List existingEntries= ClasspathModifier.getExistingEntries(project);
	if (removeProjectFromClasspath) {
	ClasspathModifier.removeFromClasspath(project, existingEntries, new SubProgressMonitor(monitor, 1));
	} else {
	monitor.worked(1);
	}

	List newEntries= new ArrayList();
	for (int i= 0; i < elements.size(); i++) {
	Object element= elements.get(i);
	CPListElement entry;
	if (element instanceof IResource)
	entry= ClasspathModifier.addToClasspath((IResource) element, existingEntries, newEntries, project, new SubProgressMonitor(monitor, 1));
	else
	entry= ClasspathModifier.addToClasspath((IJavaElement) element, existingEntries, newEntries, project, new SubProgressMonitor(monitor, 1));
	newEntries.add(entry);
	}

	Set modifiedSourceEntries= new HashSet();
	BuildPathBasePage.fixNestingConflicts((CPListElement[])newEntries.toArray(new CPListElement[newEntries.size()]), (CPListElement[])existingEntries.toArray(new CPListElement[existingEntries.size()]), modifiedSourceEntries);

	ClasspathModifier.setNewEntry(existingEntries, newEntries, project, new SubProgressMonitor(monitor, 1));

	ClasspathModifier.commitClassPath(existingEntries, project, new SubProgressMonitor(monitor, 1));

	List result= new ArrayList();
	for (int i= 0; i < newEntries.size(); i++) {
	IClasspathEntry entry= ((CPListElement) newEntries.get(i)).getClasspathEntry();
	IJavaElement root;
	if (entry.getPath().equals(project.getPath()))
	root= project;
	else
	root= project.findPackageFragmentRoot(entry.getPath());
	if (root != null) {
	result.add(root);
	}
	}

	return result;
	} finally {
	monitor.done();
	}
	}

	/**
	* {@inheritDoc}
	*/
	public void selectionChanged(final SelectionChangedEvent event) {
	final ISelection selection = event.getSelection();
	if (selection instanceof IStructuredSelection) {
	setEnabled(canHandle((IStructuredSelection) selection));
	} else {
	setEnabled(canHandle(StructuredSelection.EMPTY));
	}
	}

	private boolean canHandle(IStructuredSelection elements) {
	if (elements.size() == 0)
	return false;
	try {
	fSelectedElements.clear();
	for (Iterator iter= elements.iterator(); iter.hasNext();) {
	Object element= iter.next();
	fSelectedElements.add(element);
	if (element instanceof IJavaProject) {
	if (ClasspathModifier.isSourceFolder((IJavaProject)element))
	return false;
	} else if (element instanceof IPackageFragment) {
	int type= DialogPackageExplorerActionGroup.getType(element, ((IPackageFragment)element).getJavaProject());
	if (type != DialogPackageExplorerActionGroup.PACKAGE_FRAGMENT && type != DialogPackageExplorerActionGroup.INCLUDED_FOLDER)
	return false;
	} else if (element instanceof IFolder) {
	IProject project= ((IFolder)element).getProject();
	IJavaProject javaProject= JavaCore.create(project);
	if (javaProject == null \|\| !javaProject.exists())
	return false;
	} else {
	return false;
	}
	}
	return true;
	} catch (CoreException e) {
	}
	return false;
	}

	private void showExceptionDialog(CoreException exception) {
	showError(exception, fSite.getShell(), NewWizardMessages.AddSourceFolderToBuildpathAction_ErrorTitle, exception.getMessage());
	}

	private void showError(CoreException e, Shell shell, String title, String message) {
	IStatus status= e.getStatus();
	if (status != null) {
	ErrorDialog.openError(shell, message, title, status);
	} else {
	MessageDialog.openError(shell, title, message);
	}
	}

	private void selectAndReveal(final ISelection selection) {
	// validate the input
	IWorkbenchPage page= fSite.getPage();
	if (page == null)
	return;

	// get all the view and editor parts
	List parts= new ArrayList();
	IWorkbenchPartReference refs[]= page.getViewReferences();
	for (int i= 0; i < refs.length; i++) {
	IWorkbenchPart part= refs[i].getPart(false);
	if (part != null)
	parts.add(part);
	}
	refs= page.getEditorReferences();
	for (int i= 0; i < refs.length; i++) {
	if (refs[i].getPart(false) != null)
	parts.add(refs[i].getPart(false));
	}

	Iterator itr= parts.iterator();
	while (itr.hasNext()) {
	IWorkbenchPart part= (IWorkbenchPart) itr.next();

	// get the part's ISetSelectionTarget implementation
	ISetSelectionTarget target= null;
	if (part instanceof ISetSelectionTarget)
	target= (ISetSelectionTarget) part;
	else
	target= (ISetSelectionTarget) part.getAdapter(ISetSelectionTarget.class);

	if (target != null) {
	// select and reveal resource
	final ISetSelectionTarget finalTarget= target;
	page.getWorkbenchWindow().getShell().getDisplay().asyncExec(new Runnable() {
	public void run() {
	finalTarget.selectReveal(selection);
	}
	});
	}
	}
	}

	}