core/plugins/org.eclipse.dltk.ui/src/org/eclipse/dltk/ui/actions/OpenViewActionGroup.java - dltk/org.eclipse.dltk.core - Git at Google

 /*******************************************************************************
  * Copyright (c) 2000, 2017 IBM Corporation and others.
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License v. 2.0 which is available at
  * http://www.eclipse.org/legal/epl-2.0.
  *
  * SPDX-License-Identifier: EPL-2.0
  *
  *******************************************************************************/
 package org.eclipse.dltk.ui.actions;

 import org.eclipse.dltk.internal.ui.callhierarchy.OpenCallHierarchyAction;
 import org.eclipse.dltk.internal.ui.editor.ScriptEditor;
 import org.eclipse.dltk.ui.IContextMenuConstants;
 import org.eclipse.jface.action.IAction;
 import org.eclipse.jface.action.IMenuManager;
 import org.eclipse.jface.viewers.ISelection;
 import org.eclipse.jface.viewers.ISelectionProvider;
 import org.eclipse.jface.viewers.IStructuredSelection;
 import org.eclipse.ui.IActionBars;
 import org.eclipse.ui.IViewPart;
 import org.eclipse.ui.IWorkbenchCommandConstants;
 import org.eclipse.ui.IWorkbenchSite;
 import org.eclipse.ui.actions.ActionFactory;
 import org.eclipse.ui.actions.ActionGroup;
 import org.eclipse.ui.dialogs.PropertyDialogAction;
 import org.eclipse.ui.part.Page;

 /**
  * Action group that adds actions to open a new DLTK view part or an external
  * viewer to a context menu and the global menu bar.
  */
 public class OpenViewActionGroup extends ActionGroup {

 	private boolean fEditorIsOwner;
 	private boolean fIsTypeHiararchyViewerOwner;
 	private boolean fIsCallHiararchyViewerOwner;

 	private ISelectionProvider fSelectionProvider;

 	// private OpenSuperImplementationAction fOpenSuperImplementation;
 	// private OpenExternalJavadocAction fOpenExternalJavadoc;
 	private OpenTypeHierarchyAction fOpenTypeHierarchy;
 	private OpenCallHierarchyAction fOpenCallHierarchy;
 	private PropertyDialogAction fOpenPropertiesDialog;

 	boolean disableCallHierarcy = false;

 	/**
 	 * Creates a new <code>OpenActionGroup</code>. The group requires that the
 	 * selection provided by the page's selection provider is of type
 	 * {@link IStructuredSelection}.
 	 *
 	 * @param page
 	 *            the page that owns this action group
 	 */
 	public OpenViewActionGroup(Page page) {
 		createSiteActions(page.getSite(), null);
 	}

 	/**
 	 * Creates a new <code>OpenActionGroup</code>. The group requires that the
 	 * selection provided by the given selection provider is of type
 	 * {@link IStructuredSelection}.
 	 *
 	 * @param page
 	 *            the page that owns this action group
 	 * @param selectionProvider
 	 *            the selection provider used instead of the page selection
 	 *            provider.
 	 *
 	 *
 	 */
 	public OpenViewActionGroup(Page page,
 			ISelectionProvider selectionProvider) {
 		createSiteActions(page.getSite(), selectionProvider);
 	}

 	/**
 	 * Creates a new <code>OpenActionGroup</code>. The group requires that the
 	 * selection provided by the part's selection provider is of type
 	 * {@link IStructuredSelection}.
 	 *
 	 * @param part
 	 *            the view part that owns this action group
 	 */
 	public OpenViewActionGroup(IViewPart part) {
 		this(part, null);
 	}

 	/**
 	 * Creates a new <code>OpenActionGroup</code>. The group requires that the
 	 * selection provided by the given selection provider is of type
 	 * {@link IStructuredSelection}.
 	 *
 	 * @param part
 	 *            the view part that owns this action group
 	 * @param selectionProvider
 	 *            the selection provider used instead of the page selection
 	 *            provider.
 	 *
 	 *
 	 */
 	public OpenViewActionGroup(IViewPart part,
 			ISelectionProvider selectionProvider) {
 		createSiteActions(part.getSite(), selectionProvider);
 		// we do a name check here to avoid class loading.
 		String partName = part.getClass().getName();
 		fIsTypeHiararchyViewerOwner = "org.eclipse.dltk.internal.ui.typehierarchy.TypeHierarchyViewPart" //$NON-NLS-1$
 				.equals(partName);
 		fIsCallHiararchyViewerOwner = "org.eclipse.dltk.internal.ui.callhierarchy.CallHierarchyViewPart" //$NON-NLS-1$
 				.equals(partName);
 	}

 	/**
 	 * Creates a new <code>OpenActionGroup</code>. The group requires that the
 	 * selection provided by the given selection provider is of type
 	 * {@link IStructuredSelection}.
 	 *
 	 * @param site
 	 *            the site that will own the action group.
 	 * @param selectionProvider
 	 *            the selection provider used instead of the page selection
 	 *            provider.
 	 *
 	 *
 	 */
 	public OpenViewActionGroup(IWorkbenchSite site,
 			ISelectionProvider selectionProvider) {
 		createSiteActions(site, selectionProvider);
 	}

 	/**
 	 * Note: This constructor is for internal use only. Clients should not call
 	 * this constructor.
 	 *
 	 * @param part
 	 *            the editor part
 	 */
 	public OpenViewActionGroup(ScriptEditor part) {
 		fEditorIsOwner = true;

 		if (part.getCallHierarchyID() == null) {
 			disableCallHierarcy = true;
 		}

 		// fOpenSuperImplementation= new OpenSuperImplementationAction(part);
 		// fOpenSuperImplementation.setActionDefinitionId(IScriptEditorActionDefinitionIds.OPEN_SUPER_IMPLEMENTATION);
 		// part.setAction("OpenSuperImplementation", fOpenSuperImplementation);
 		// //$NON-NLS-1$

 		// fOpenExternalJavadoc= new OpenExternalJavadocAction(part);
 		// fOpenExternalJavadoc.setActionDefinitionId(IScriptEditorActionDefinitionIds.OPEN_EXTERNAL_JAVADOC);
 		// part.setAction("OpenExternalJavadoc", fOpenExternalJavadoc);
 		// //$NON-NLS-1$

 		fOpenTypeHierarchy = new OpenTypeHierarchyAction(part);
 		fOpenTypeHierarchy.setActionDefinitionId(
 				IScriptEditorActionDefinitionIds.OPEN_TYPE_HIERARCHY);
 		part.setAction("OpenTypeHierarchy", fOpenTypeHierarchy); //$NON-NLS-1$
 		if (!disableCallHierarcy) {
 			fOpenCallHierarchy = new OpenCallHierarchyAction(part);
 			fOpenCallHierarchy.setActionDefinitionId(
 					IScriptEditorActionDefinitionIds.OPEN_CALL_HIERARCHY);
 			part.setAction("OpenCallHierarchy", fOpenCallHierarchy); //$NON-NLS-1$
 		}

 		initialize(part.getEditorSite().getSelectionProvider());
 	}

 	private void createSiteActions(IWorkbenchSite site,
 			ISelectionProvider specialProvider) {
 		// fOpenSuperImplementation= new OpenSuperImplementationAction(site);
 		// fOpenSuperImplementation.setActionDefinitionId(IScriptEditorActionDefinitionIds.OPEN_SUPER_IMPLEMENTATION);
 		// fOpenSuperImplementation.setSpecialSelectionProvider(specialProvider);
 		//
 		// fOpenExternalJavadoc= new OpenExternalJavadocAction(site);
 		// fOpenExternalJavadoc.setActionDefinitionId(IScriptEditorActionDefinitionIds.OPEN_EXTERNAL_JAVADOC);
 		// fOpenExternalJavadoc.setSpecialSelectionProvider(specialProvider);
 		//
 		fOpenTypeHierarchy = new OpenTypeHierarchyAction(site);
 		fOpenTypeHierarchy.setActionDefinitionId(
 				IScriptEditorActionDefinitionIds.OPEN_TYPE_HIERARCHY);
 		fOpenTypeHierarchy.setSpecialSelectionProvider(specialProvider);

 		if (!disableCallHierarcy) {
 			fOpenCallHierarchy = new OpenCallHierarchyAction(site);
 			fOpenCallHierarchy.setActionDefinitionId(
 					IScriptEditorActionDefinitionIds.OPEN_CALL_HIERARCHY);
 			fOpenCallHierarchy.setSpecialSelectionProvider(specialProvider);
 		}

 		ISelectionProvider provider = specialProvider != null ? specialProvider
 				: site.getSelectionProvider();

 		if (getShowProperties()) {
 			fOpenPropertiesDialog = new PropertyDialogAction(site, provider);
 			fOpenPropertiesDialog.setActionDefinitionId(
 					IWorkbenchCommandConstants.FILE_PROPERTIES);
 		}

 		initialize(provider);
 	}

 	private void initialize(ISelectionProvider provider) {
 		fSelectionProvider = provider;
 		ISelection selection = provider.getSelection();
 		// fOpenSuperImplementation.update(selection);
 		// fOpenExternalJavadoc.update(selection);
 		fOpenTypeHierarchy.update(selection);
 		if (!disableCallHierarcy) {
 			fOpenCallHierarchy.update(selection);
 		}
 		if (!fEditorIsOwner) {
 			if (getShowProperties()) {
 				if (selection instanceof IStructuredSelection) {
 					IStructuredSelection ss = (IStructuredSelection) selection;
 					fOpenPropertiesDialog.selectionChanged(ss);
 				} else {
 					fOpenPropertiesDialog.selectionChanged(selection);
 				}
 			}
 			// provider.addSelectionChangedListener(fOpenSuperImplementation);
 			// provider.addSelectionChangedListener(fOpenExternalJavadoc);
 			provider.addSelectionChangedListener(fOpenTypeHierarchy);
 			if (!disableCallHierarcy) {
 				provider.addSelectionChangedListener(fOpenCallHierarchy);
 			}
 			// no need to register the open properties dialog action since it
 			// registers itself
 		}
 	}

 	@Override
 	public void fillActionBars(IActionBars actionBar) {
 		super.fillActionBars(actionBar);
 		setGlobalActionHandlers(actionBar);
 	}

 	@Override
 	public void fillContextMenu(IMenuManager menu) {
 		super.fillContextMenu(menu);
 		if (!fIsTypeHiararchyViewerOwner)
 			appendToGroup(menu, fOpenTypeHierarchy);
 		if (!fIsCallHiararchyViewerOwner) {
 			if (!disableCallHierarcy) {
 				appendToGroup(menu, fOpenCallHierarchy);
 			}
 		}
 		IStructuredSelection selection = getStructuredSelection();
 		if (getShowProperties() && fOpenPropertiesDialog != null
 				&& fOpenPropertiesDialog.isEnabled() && selection != null
 				&& fOpenPropertiesDialog.isApplicableForSelection(selection))
 			menu.appendToGroup(IContextMenuConstants.GROUP_PROPERTIES,
 					fOpenPropertiesDialog);
 	}

 	@Override
 	public void dispose() {
 		// fSelectionProvider.removeSelectionChangedListener(fOpenSuperImplementation);
 		// fSelectionProvider.removeSelectionChangedListener(fOpenExternalJavadoc);
 		fSelectionProvider.removeSelectionChangedListener(fOpenTypeHierarchy);
 		if (!disableCallHierarcy) {
 			fSelectionProvider
 					.removeSelectionChangedListener(fOpenCallHierarchy);
 		}
 		super.dispose();
 	}

 	private void setGlobalActionHandlers(IActionBars actionBars) {
 		// actionBars.setGlobalActionHandler(DLTKActionConstants.OPEN_SUPER_IMPLEMENTATION,
 		// fOpenSuperImplementation);
 		// actionBars.setGlobalActionHandler(DLTKActionConstants.OPEN_EXTERNAL_JAVA_DOC,
 		// fOpenExternalJavadoc);
 		actionBars.setGlobalActionHandler(
 				DLTKActionConstants.OPEN_TYPE_HIERARCHY, fOpenTypeHierarchy);
 		if (!disableCallHierarcy) {
 			actionBars.setGlobalActionHandler(
 					DLTKActionConstants.OPEN_CALL_HIERARCHY,
 					fOpenCallHierarchy);
 		}

 		if (!fEditorIsOwner && getShowProperties())
 			actionBars.setGlobalActionHandler(ActionFactory.PROPERTIES.getId(),
 					fOpenPropertiesDialog);
 	}

 	private void appendToGroup(IMenuManager menu, IAction action) {
 		if (action.isEnabled())
 			menu.appendToGroup(IContextMenuConstants.GROUP_OPEN, action);
 	}

 	private IStructuredSelection getStructuredSelection() {
 		ISelection selection = getContext().getSelection();
 		if (selection instanceof IStructuredSelection)
 			return (IStructuredSelection) selection;
 		return null;
 	}

 	/**
 	 * Note: This method is for internal use only. As specified in the class
 	 * documentation, this class should not be subclassed by clients.
 	 */
 	protected boolean getShowProperties() {
 		return true;
 	}
 }
	/*******************************************************************************
	* Copyright (c) 2000, 2017 IBM Corporation and others.
	* This program and the accompanying materials are made available under the
	* terms of the Eclipse Public License v. 2.0 which is available at
	* http://www.eclipse.org/legal/epl-2.0.
	*
	* SPDX-License-Identifier: EPL-2.0
	*
	*******************************************************************************/
	package org.eclipse.dltk.ui.actions;

	import org.eclipse.dltk.internal.ui.callhierarchy.OpenCallHierarchyAction;
	import org.eclipse.dltk.internal.ui.editor.ScriptEditor;
	import org.eclipse.dltk.ui.IContextMenuConstants;
	import org.eclipse.jface.action.IAction;
	import org.eclipse.jface.action.IMenuManager;
	import org.eclipse.jface.viewers.ISelection;
	import org.eclipse.jface.viewers.ISelectionProvider;
	import org.eclipse.jface.viewers.IStructuredSelection;
	import org.eclipse.ui.IActionBars;
	import org.eclipse.ui.IViewPart;
	import org.eclipse.ui.IWorkbenchCommandConstants;
	import org.eclipse.ui.IWorkbenchSite;
	import org.eclipse.ui.actions.ActionFactory;
	import org.eclipse.ui.actions.ActionGroup;
	import org.eclipse.ui.dialogs.PropertyDialogAction;
	import org.eclipse.ui.part.Page;

	/**
	* Action group that adds actions to open a new DLTK view part or an external
	* viewer to a context menu and the global menu bar.
	*/
	public class OpenViewActionGroup extends ActionGroup {

	private boolean fEditorIsOwner;
	private boolean fIsTypeHiararchyViewerOwner;
	private boolean fIsCallHiararchyViewerOwner;

	private ISelectionProvider fSelectionProvider;

	// private OpenSuperImplementationAction fOpenSuperImplementation;
	// private OpenExternalJavadocAction fOpenExternalJavadoc;
	private OpenTypeHierarchyAction fOpenTypeHierarchy;
	private OpenCallHierarchyAction fOpenCallHierarchy;
	private PropertyDialogAction fOpenPropertiesDialog;

	boolean disableCallHierarcy = false;

	/**
	* Creates a new <code>OpenActionGroup</code>. The group requires that the
	* selection provided by the page's selection provider is of type
	* {@link IStructuredSelection}.
	*
	* @param page
	* the page that owns this action group
	*/
	public OpenViewActionGroup(Page page) {
	createSiteActions(page.getSite(), null);
	}

	/**
	* Creates a new <code>OpenActionGroup</code>. The group requires that the
	* selection provided by the given selection provider is of type
	* {@link IStructuredSelection}.
	*
	* @param page
	* the page that owns this action group
	* @param selectionProvider
	* the selection provider used instead of the page selection
	* provider.
	*
	*
	*/
	public OpenViewActionGroup(Page page,
	ISelectionProvider selectionProvider) {
	createSiteActions(page.getSite(), selectionProvider);
	}

	/**
	* Creates a new <code>OpenActionGroup</code>. The group requires that the
	* selection provided by the part's selection provider is of type
	* {@link IStructuredSelection}.
	*
	* @param part
	* the view part that owns this action group
	*/
	public OpenViewActionGroup(IViewPart part) {
	this(part, null);
	}

	/**
	* Creates a new <code>OpenActionGroup</code>. The group requires that the
	* selection provided by the given selection provider is of type
	* {@link IStructuredSelection}.
	*
	* @param part
	* the view part that owns this action group
	* @param selectionProvider
	* the selection provider used instead of the page selection
	* provider.
	*
	*
	*/
	public OpenViewActionGroup(IViewPart part,
	ISelectionProvider selectionProvider) {
	createSiteActions(part.getSite(), selectionProvider);
	// we do a name check here to avoid class loading.
	String partName = part.getClass().getName();
	fIsTypeHiararchyViewerOwner = "org.eclipse.dltk.internal.ui.typehierarchy.TypeHierarchyViewPart" //$NON-NLS-1$
	.equals(partName);
	fIsCallHiararchyViewerOwner = "org.eclipse.dltk.internal.ui.callhierarchy.CallHierarchyViewPart" //$NON-NLS-1$
	.equals(partName);
	}

	/**
	* Creates a new <code>OpenActionGroup</code>. The group requires that the
	* selection provided by the given selection provider is of type
	* {@link IStructuredSelection}.
	*
	* @param site
	* the site that will own the action group.
	* @param selectionProvider
	* the selection provider used instead of the page selection
	* provider.
	*
	*
	*/
	public OpenViewActionGroup(IWorkbenchSite site,
	ISelectionProvider selectionProvider) {
	createSiteActions(site, selectionProvider);
	}

	/**
	* Note: This constructor is for internal use only. Clients should not call
	* this constructor.
	*
	* @param part
	* the editor part
	*/
	public OpenViewActionGroup(ScriptEditor part) {
	fEditorIsOwner = true;

	if (part.getCallHierarchyID() == null) {
	disableCallHierarcy = true;
	}

	// fOpenSuperImplementation= new OpenSuperImplementationAction(part);
	// fOpenSuperImplementation.setActionDefinitionId(IScriptEditorActionDefinitionIds.OPEN_SUPER_IMPLEMENTATION);
	// part.setAction("OpenSuperImplementation", fOpenSuperImplementation);
	// //$NON-NLS-1$

	// fOpenExternalJavadoc= new OpenExternalJavadocAction(part);
	// fOpenExternalJavadoc.setActionDefinitionId(IScriptEditorActionDefinitionIds.OPEN_EXTERNAL_JAVADOC);
	// part.setAction("OpenExternalJavadoc", fOpenExternalJavadoc);
	// //$NON-NLS-1$

	fOpenTypeHierarchy = new OpenTypeHierarchyAction(part);
	fOpenTypeHierarchy.setActionDefinitionId(
	IScriptEditorActionDefinitionIds.OPEN_TYPE_HIERARCHY);
	part.setAction("OpenTypeHierarchy", fOpenTypeHierarchy); //$NON-NLS-1$
	if (!disableCallHierarcy) {
	fOpenCallHierarchy = new OpenCallHierarchyAction(part);
	fOpenCallHierarchy.setActionDefinitionId(
	IScriptEditorActionDefinitionIds.OPEN_CALL_HIERARCHY);
	part.setAction("OpenCallHierarchy", fOpenCallHierarchy); //$NON-NLS-1$
	}

	initialize(part.getEditorSite().getSelectionProvider());
	}

	private void createSiteActions(IWorkbenchSite site,
	ISelectionProvider specialProvider) {
	// fOpenSuperImplementation= new OpenSuperImplementationAction(site);
	// fOpenSuperImplementation.setActionDefinitionId(IScriptEditorActionDefinitionIds.OPEN_SUPER_IMPLEMENTATION);
	// fOpenSuperImplementation.setSpecialSelectionProvider(specialProvider);
	//
	// fOpenExternalJavadoc= new OpenExternalJavadocAction(site);
	// fOpenExternalJavadoc.setActionDefinitionId(IScriptEditorActionDefinitionIds.OPEN_EXTERNAL_JAVADOC);
	// fOpenExternalJavadoc.setSpecialSelectionProvider(specialProvider);
	//
	fOpenTypeHierarchy = new OpenTypeHierarchyAction(site);
	fOpenTypeHierarchy.setActionDefinitionId(
	IScriptEditorActionDefinitionIds.OPEN_TYPE_HIERARCHY);
	fOpenTypeHierarchy.setSpecialSelectionProvider(specialProvider);

	if (!disableCallHierarcy) {
	fOpenCallHierarchy = new OpenCallHierarchyAction(site);
	fOpenCallHierarchy.setActionDefinitionId(
	IScriptEditorActionDefinitionIds.OPEN_CALL_HIERARCHY);
	fOpenCallHierarchy.setSpecialSelectionProvider(specialProvider);
	}

	ISelectionProvider provider = specialProvider != null ? specialProvider
	: site.getSelectionProvider();

	if (getShowProperties()) {
	fOpenPropertiesDialog = new PropertyDialogAction(site, provider);
	fOpenPropertiesDialog.setActionDefinitionId(
	IWorkbenchCommandConstants.FILE_PROPERTIES);
	}

	initialize(provider);
	}

	private void initialize(ISelectionProvider provider) {
	fSelectionProvider = provider;
	ISelection selection = provider.getSelection();
	// fOpenSuperImplementation.update(selection);
	// fOpenExternalJavadoc.update(selection);
	fOpenTypeHierarchy.update(selection);
	if (!disableCallHierarcy) {
	fOpenCallHierarchy.update(selection);
	}
	if (!fEditorIsOwner) {
	if (getShowProperties()) {
	if (selection instanceof IStructuredSelection) {
	IStructuredSelection ss = (IStructuredSelection) selection;
	fOpenPropertiesDialog.selectionChanged(ss);
	} else {
	fOpenPropertiesDialog.selectionChanged(selection);
	}
	}
	// provider.addSelectionChangedListener(fOpenSuperImplementation);
	// provider.addSelectionChangedListener(fOpenExternalJavadoc);
	provider.addSelectionChangedListener(fOpenTypeHierarchy);
	if (!disableCallHierarcy) {
	provider.addSelectionChangedListener(fOpenCallHierarchy);
	}
	// no need to register the open properties dialog action since it
	// registers itself
	}
	}

	@Override
	public void fillActionBars(IActionBars actionBar) {
	super.fillActionBars(actionBar);
	setGlobalActionHandlers(actionBar);
	}

	@Override
	public void fillContextMenu(IMenuManager menu) {
	super.fillContextMenu(menu);
	if (!fIsTypeHiararchyViewerOwner)
	appendToGroup(menu, fOpenTypeHierarchy);
	if (!fIsCallHiararchyViewerOwner) {
	if (!disableCallHierarcy) {
	appendToGroup(menu, fOpenCallHierarchy);
	}
	}
	IStructuredSelection selection = getStructuredSelection();
	if (getShowProperties() && fOpenPropertiesDialog != null
	&& fOpenPropertiesDialog.isEnabled() && selection != null
	&& fOpenPropertiesDialog.isApplicableForSelection(selection))
	menu.appendToGroup(IContextMenuConstants.GROUP_PROPERTIES,
	fOpenPropertiesDialog);
	}

	@Override
	public void dispose() {
	// fSelectionProvider.removeSelectionChangedListener(fOpenSuperImplementation);
	// fSelectionProvider.removeSelectionChangedListener(fOpenExternalJavadoc);
	fSelectionProvider.removeSelectionChangedListener(fOpenTypeHierarchy);
	if (!disableCallHierarcy) {
	fSelectionProvider
	.removeSelectionChangedListener(fOpenCallHierarchy);
	}
	super.dispose();
	}

	private void setGlobalActionHandlers(IActionBars actionBars) {
	// actionBars.setGlobalActionHandler(DLTKActionConstants.OPEN_SUPER_IMPLEMENTATION,
	// fOpenSuperImplementation);
	// actionBars.setGlobalActionHandler(DLTKActionConstants.OPEN_EXTERNAL_JAVA_DOC,
	// fOpenExternalJavadoc);
	actionBars.setGlobalActionHandler(
	DLTKActionConstants.OPEN_TYPE_HIERARCHY, fOpenTypeHierarchy);
	if (!disableCallHierarcy) {
	actionBars.setGlobalActionHandler(
	DLTKActionConstants.OPEN_CALL_HIERARCHY,
	fOpenCallHierarchy);
	}

	if (!fEditorIsOwner && getShowProperties())
	actionBars.setGlobalActionHandler(ActionFactory.PROPERTIES.getId(),
	fOpenPropertiesDialog);
	}

	private void appendToGroup(IMenuManager menu, IAction action) {
	if (action.isEnabled())
	menu.appendToGroup(IContextMenuConstants.GROUP_OPEN, action);
	}

	private IStructuredSelection getStructuredSelection() {
	ISelection selection = getContext().getSelection();
	if (selection instanceof IStructuredSelection)
	return (IStructuredSelection) selection;
	return null;
	}

	/**
	* Note: This method is for internal use only. As specified in the class
	* documentation, this class should not be subclassed by clients.
	*/
	protected boolean getShowProperties() {
	return true;
	}
	}