/*******************************************************************************
 * Copyright (c) 2004, 2006 Sybase, Inc. 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:
 *     Sybase, Inc. - initial API and implementation
 *******************************************************************************/
package org.eclipse.jst.jsf.facesconfig.ui;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.EventObject;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IFolder;
import org.eclipse.core.resources.IMarker;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.IResourceChangeEvent;
import org.eclipse.core.resources.IResourceChangeListener;
import org.eclipse.core.resources.IResourceDelta;
import org.eclipse.core.resources.IResourceDeltaVisitor;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.Assert;
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.NullProgressMonitor;
import org.eclipse.core.runtime.Status;
import org.eclipse.emf.common.command.BasicCommandStack;
import org.eclipse.emf.common.notify.AdapterFactory;
import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.emf.ecore.resource.ResourceSet;
import org.eclipse.emf.edit.domain.AdapterFactoryEditingDomain;
import org.eclipse.emf.edit.domain.EditingDomain;
import org.eclipse.emf.edit.domain.IEditingDomainProvider;
import org.eclipse.emf.edit.provider.ComposedAdapterFactory;
import org.eclipse.emf.edit.provider.ReflectiveItemProviderAdapterFactory;
import org.eclipse.emf.edit.provider.resource.ResourceItemProviderAdapterFactory;
import org.eclipse.gef.commands.CommandStack;
import org.eclipse.gef.commands.CommandStackListener;
import org.eclipse.gef.editparts.ZoomManager;
import org.eclipse.gef.ui.actions.ActionRegistry;
import org.eclipse.gef.ui.actions.EditorPartAction;
import org.eclipse.gef.ui.actions.SaveAction;
import org.eclipse.gef.ui.actions.UpdateAction;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.ISelectionProvider;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.jst.jsf.facesconfig.common.actions.IOpenPage;
import org.eclipse.jst.jsf.facesconfig.edit.provider.FacesConfigItemProviderAdapterFactory;
import org.eclipse.jst.jsf.facesconfig.emf.FacesConfigType;
import org.eclipse.jst.jsf.facesconfig.ui.page.ComponentsPage;
import org.eclipse.jst.jsf.facesconfig.ui.page.IntroductionPage;
import org.eclipse.jst.jsf.facesconfig.ui.page.ManagedBeanPage;
import org.eclipse.jst.jsf.facesconfig.ui.page.OthersPage;
import org.eclipse.jst.jsf.facesconfig.ui.page.OverviewPage;
import org.eclipse.jst.jsf.facesconfig.ui.pageflow.DelegatingZoomManager;
import org.eclipse.jst.jsf.facesconfig.ui.pageflow.PageflowEditor;
import org.eclipse.jst.jsf.facesconfig.ui.pageflow.command.DelegatingCommandStack;
import org.eclipse.jst.jsf.facesconfig.ui.pageflow.command.EMFCommandStackGEFAdapter;
import org.eclipse.jst.jsf.facesconfig.ui.pageflow.layout.PageflowLayoutManager;
import org.eclipse.jst.jsf.facesconfig.ui.util.WebrootUtil;
import org.eclipse.jst.jsf.facesconfig.util.FacesConfigArtifactEdit;
import org.eclipse.swt.custom.CTabFolder;
import org.eclipse.ui.IActionBars;
import org.eclipse.ui.IEditorActionBarContributor;
import org.eclipse.ui.IEditorInput;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.IEditorSite;
import org.eclipse.ui.IFileEditorInput;
import org.eclipse.ui.PartInitException;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.actions.WorkspaceModifyOperation;
import org.eclipse.ui.dialogs.SaveAsDialog;
import org.eclipse.ui.forms.editor.FormEditor;
import org.eclipse.ui.forms.editor.FormPage;
import org.eclipse.ui.forms.editor.IFormPage;
import org.eclipse.ui.ide.IDE;
import org.eclipse.ui.ide.IGotoMarker;
import org.eclipse.ui.part.FileEditorInput;
import org.eclipse.ui.views.contentoutline.IContentOutlinePage;
import org.eclipse.ui.views.properties.IPropertySheetPage;
import org.eclipse.wst.common.ui.properties.internal.provisional.ITabbedPropertySheetPageContributor;
import org.eclipse.wst.common.ui.properties.internal.provisional.TabbedPropertySheetPage;
import org.eclipse.wst.sse.ui.StructuredTextEditor;

/**
 * 
 * @author sfshi
 * 
 */
public class FacesConfigEditor extends FormEditor implements
		IEditingDomainProvider, ISelectionProvider {

	/**
	 * editing domain that is used to track all changes to the model
	 */
	private AdapterFactoryEditingDomain editingDomain;

	/**
	 * adapter factory used for providing views of the model
	 */
	private ComposedAdapterFactory adapterFactory;

	/** id of the pageflowPage */
	private int pageflowPageID;

	private int managedBeanPageID;

	private int componentsPageID;

	private int othersPageID;

	private int sourcePageId;

	private PageflowEditor pageflowPage;

	/** The source text editor. */
	private StructuredTextEditor sourcePage;

	protected Collection selectionChangedListeners = new ArrayList();

	private FacesConfigArtifactEdit facesConfigAtrifactEdit;

	public static final String EDITOR_ID = "org.eclipse.jst.jsf.facesconfig.ui.FacesConfigEditor";

	protected ISelection editorSelection = StructuredSelection.EMPTY;

	private IContentOutlinePage outlinePage;

	private IProject currentProject;

	public FacesConfigEditor() {
		initializeEMF();
	}

	/**
	 * This listens for workspace changes. <!-- begin-user-doc --> <!--
	 * end-user-doc -->
	 * 
	 * @generated
	 */
	protected IResourceChangeListener resourceChangeListener = new IResourceChangeListener() {
		public void resourceChanged(IResourceChangeEvent event) {
			// Only listening to these.
			// if (event.getType() == IResourceDelta.POST_CHANGE)
			{
				IResourceDelta delta = event.getDelta();
				try {
					class ResourceDeltaVisitor implements IResourceDeltaVisitor {
						protected ResourceSet resourceSet = editingDomain
								.getResourceSet();

						protected Collection changedResources = new ArrayList();

						protected Collection removedResources = new ArrayList();

						public boolean visit(IResourceDelta delta) {
							if (delta.getFlags() != IResourceDelta.MARKERS
									&& delta.getResource().getType() == IResource.FILE) {
								if ((delta.getKind() & (IResourceDelta.CHANGED | IResourceDelta.REMOVED)) != 0) {
									Resource resource = resourceSet
											.getResource(URI.createURI(delta
													.getFullPath().toString()),
													false);
									if (resource != null) {
										if ((delta.getKind() & IResourceDelta.REMOVED) != 0) {
											removedResources.add(resource);
										} else {
											changedResources.add(resource);
										}
									}
								}
							}

							return true;
						}

						public Collection getChangedResources() {
							return changedResources;
						}

						public Collection getRemovedResources() {
							return removedResources;
						}
					}

					ResourceDeltaVisitor visitor = new ResourceDeltaVisitor();
					delta.accept(visitor);

					if (!visitor.getRemovedResources().isEmpty()) {
						removedResources.addAll(visitor.getRemovedResources());
						if (!isDirty()) {
							getSite().getShell().getDisplay().asyncExec(
									new Runnable() {
										public void run() {
											getSite().getPage().closeEditor(
													FacesConfigEditor.this,
													false);
											FacesConfigEditor.this.dispose();
										}
									});
						}
					}

					if (!visitor.getChangedResources().isEmpty()) {
						changedResources.addAll(visitor.getChangedResources());
					}
				} catch (CoreException exception) {
					// log it.
					EditorPlugin.getDefault().getLog().log(
							new Status(IStatus.ERROR, EditorPlugin
									.getPluginId(), IStatus.OK, exception
									.getMessage() == null ? "" : exception
									.getMessage(), exception));
				}
			}
		}
	};

	/**
	 * Resources that have been removed since last activation.
	 * 
	 * @generated
	 */
	Collection removedResources = new ArrayList();

	/**
	 * Resources that have been changed since last activation.
	 * 
	 * @generated
	 */
	Collection changedResources = new ArrayList();

	/**
	 * Resources that have been saved.
	 * 
	 * @generated
	 */
	Collection savedResources = new ArrayList();

	/**
	 * Initializes the EMF support.
	 */
	private void initializeEMF() {
		// create an adapter factory that yields item providers
		List factories = new ArrayList();
		factories.add(new ResourceItemProviderAdapterFactory());
		factories.add(new FacesConfigItemProviderAdapterFactory());
		factories.add(new ReflectiveItemProviderAdapterFactory());
		adapterFactory = new ComposedAdapterFactory(factories);

		// create the command stack that will notify this editor as commands are
		// executed
		BasicCommandStack commandStack = new BasicCommandStack();
		commandStack
				.addCommandStackListener(new org.eclipse.emf.common.command.CommandStackListener() {
					public void commandStackChanged(final EventObject event) {
						getContainer().getShell().getDisplay().asyncExec(
								new Runnable() {
									public void run() {
										editorDirtyStateChanged();
										getActionBarContributor().updateActionBars();
									}
								});
					}
				});
		// commandStack.addCommandStackListener(this);
		// create the editing domain with a special command stack
		editingDomain = new AdapterFactoryEditingDomain(adapterFactory,
				commandStack, new HashMap());
	}

	/*
	 * @see org.eclipse.ui.IEditorPart#init(org.eclipse.ui.IEditorSite,
	 *      org.eclipse.ui.IEditorInput)
	 */
	public void init(IEditorSite site, IEditorInput input)
			throws PartInitException {
		super.init(site, input);
		setPartName(input.getName());
		if (!isValidInput(input)) {
			PlatformUI.getWorkbench().getActiveWorkbenchWindow()
					.getActivePage().openEditor(input,
							"org.eclipse.ui.DefaultTextEditor"); //$NON-NLS-1$

			close(false);
			return;
		}

		createActions();

		ResourcesPlugin.getWorkspace().addResourceChangeListener(
				resourceChangeListener, IResourceChangeEvent.POST_CHANGE);
	}

	/*
	 * @see org.eclipse.ui.part.EditorPart#setInput(org.eclipse.ui.IEditorInput)
	 */
	protected void setInput(IEditorInput input) {
		super.setInput(input);

		IFile inputFile = (IFile) input.getAdapter(IFile.class);
		if (inputFile != null) {
			IProject project = inputFile.getProject();
			IPath inputPath = inputFile.getFullPath();
			loadModel(project, inputPath);
		}
	}

	/**
	 * Loads the configuration model from the given path.
	 * 
	 */
	private void loadModel(IProject project, IPath modelPath) {

		IFolder webContentFolder = WebrootUtil.getWebContentFolder(project);
		Assert.isTrue(webContentFolder != null && webContentFolder.exists());

		IPath relativePath = modelPath;
		if (webContentFolder.getFullPath().isPrefixOf(modelPath)) {
			relativePath = modelPath.removeFirstSegments(webContentFolder
					.getFullPath().segmentCount());
		}
		facesConfigAtrifactEdit = FacesConfigArtifactEdit
				.getFacesConfigArtifactEditForWrite(project, relativePath
						.toString());
	}

	protected void addPages() {
		try {
			IntroductionPage page1 = new IntroductionPage(this);
			addPage(page1, null);

			IFormPage overviewPage = new OverviewPage(this);
			addPage(overviewPage, null);

			// Page flow
			createAndAddPageflowPage();

			// pages
			IFormPage managedBeanPage = new ManagedBeanPage(this);
			managedBeanPageID = addPage(managedBeanPage, null);
			IFormPage componentsPage = new ComponentsPage(this);
			componentsPageID = addPage(componentsPage, null);
			IFormPage othersPage = new OthersPage(this);
			othersPageID = addPage(othersPage, null);

			sourcePage = new StructuredTextEditor();

			sourcePage.setEditorPart(this);

			sourcePageId = addPage(sourcePage, this.getEditorInput());
			setPageText(sourcePageId,
					EditorMessages.FacesConfigEditor_Source_TabName);
			sourcePage.update();

		} catch (PartInitException e) {
			EditorPlugin.getDefault().getLog().log(
					new Status(IStatus.ERROR, EditorPlugin.getPluginId(),
							IStatus.OK, e.getMessage() == null ? "" : e
									.getMessage(), e));
		}

	}

	/**
	 * Creates the pageflow page of the multi-page editor.
	 */
	protected void createAndAddPageflowPage() throws PartInitException {
		pageflowPage = new PageflowEditor(this);
		pageflowPageID = addPage(pageflowPage, getEditorInput());
		setPageText(pageflowPageID, "Navigation Rule");
		addPageActionRegistry(pageflowPage);
		pageflowPage.getModelsTransform().setFacesConfig(getFacesConfig());
		pageflowPage.getModelsTransform().setPageflow(
				pageflowPage.getPageflow());
		boolean fornew = pageflowPage.getModelsTransform()
				.updatePageflowModelFromEMF();
		pageflowPage.setGraphicalViewerContents(pageflowPage.getPageflow());
		if (fornew) {
			PageflowLayoutManager.getInstance().layoutPageflow(
					pageflowPage.getPageflow());
		}
		pageflowPage.getModelsTransform().setListenToNotify(true);
	}

	public PageflowEditor getPageflowPage() {
		return pageflowPage;
	}

	/**
	 * get the action's registry of sub pages.
	 * 
	 */
	protected void addPageActionRegistry(IEditorPart page) {
		if (page != null) {
			ActionRegistry pageActionRegisty = (ActionRegistry) page
					.getAdapter(ActionRegistry.class);
			if (pageActionRegisty != null) {
				for (Iterator iter = pageActionRegisty.getActions(); iter
						.hasNext();) {
					getActionRegistry().registerAction((IAction) iter.next());
				}
			}
		}
	}

	/** the editor's action registry */
	private ActionRegistry actionRegistry = null;

	/**
	 * Returns the action registry of this editor.
	 * 
	 * @return - the action registry
	 */
	protected ActionRegistry getActionRegistry() {
		if (null == actionRegistry) {
			actionRegistry = new ActionRegistry();
		}

		return actionRegistry;
	}

	/**
	 * Returns the root object of the configuration model.
	 * 
	 * @return the root object
	 */
	public FacesConfigType getFacesConfig() {
		FacesConfigType facesConfig = facesConfigAtrifactEdit.getFacesConfig();
		return facesConfig;
	}

	/*
	 * @see org.eclipse.ui.ISaveablePart#isDirty()
	 */
	public boolean isDirty() {
		return ((BasicCommandStack) editingDomain.getCommandStack())
				.isSaveNeeded()
				|| super.isDirty();
	}

	/**
	 * This class listens for command stack changes of the pages contained in
	 * this editor and decides if the editor is dirty or not.
	 */
	private class MultiPageCommandStackListener implements CommandStackListener {

		/** the observed command stacks */
		private List commandStacks = new ArrayList(2);

		/** to get the editorpart from command stack */
		private HashMap mapEditorCommandStack = new HashMap();

		private boolean saveLocation = false;

		/**
		 * Adds a <code>CommandStack</code> to observe.
		 * 
		 * @param commandStack
		 */
		public void addCommandStack(CommandStack commandStack,
				IEditorPart editor) {
			if (commandStack == null) {
				return;
			}
			if (mapEditorCommandStack.get(commandStack) == editor) {
				return;
			}
			commandStacks.add(commandStack);
			commandStack.addCommandStackListener(this);
			mapEditorCommandStack.put(commandStack, editor);
		}

		/**
		 * set the dirty status for the models of different editor
		 * 
		 * @param editor -
		 *            editor, e.g., pageflow or databinding page.
		 * @param dirty -
		 *            true or false
		 */
		private void setEditorDirty(IEditorPart editor, boolean dirty) {

		}

		/** the list of action ids that are to CommandStack actions */
		private List stackActionIDs = new ArrayList();

		/**
		 * Updates the specified actions.
		 * 
		 * @param actionIds -
		 *            the list of ids of actions to update
		 */
		private void updateActions(List actionIds) {
			for (Iterator ids = actionIds.iterator(); ids.hasNext();) {
				IAction action = getActionRegistry().getAction(ids.next());
				if (null != action && action instanceof UpdateAction) {
					((UpdateAction) action).update();
				}
			}
		}

		/*
		 * (non-Javadoc)
		 * 
		 * @see CommandStackListener#commandStackChanged(java.util.EventObject)
		 */
		public void commandStackChanged(EventObject event) {
			// enable or disable the actions
			updateActions(stackActionIDs);
			if (((CommandStack) event.getSource()).isDirty()) {
				// set the editor's model dirty status
				setEditorDirty((IEditorPart) mapEditorCommandStack
						.get(((CommandStack) event.getSource())), true);
				// at least one command stack is dirty,
				// so the multi page editor is dirty too
				setDirty(true);
			} else {
				// set the editor's model dirty status, if it is from not save
				// location.
				if (!saveLocation) {
					setEditorDirty((IEditorPart) mapEditorCommandStack
							.get(((CommandStack) event.getSource())), true);
					setDirty(true);
				} else {
					setDirty(false);
				}
			}
		}

		/** the pageflow page editor's dirty state */
		private boolean isDirty = false;

		/**
		 * Changes the dirty state.
		 * 
		 * @param dirty -
		 *            dirty state
		 */
		public void setDirty(boolean dirty) {
			if (isDirty != dirty) {
				isDirty = dirty;
				firePropertyChange(IEditorPart.PROP_DIRTY);
			}
		}

		/**
		 * Disposed the listener
		 */
		public void dispose() {
			for (Iterator stacks = commandStacks.iterator(); stacks.hasNext();) {
				((CommandStack) stacks.next()).removeCommandStackListener(this);
			}
			commandStacks.clear();
		}

		/**
		 * Marks every observed command stack beeing saved. This method should
		 * be called whenever the editor/model was saved.
		 */
		public void markSaveLocations() {
			saveLocation = true;
			for (Iterator stacks = commandStacks.iterator(); stacks.hasNext();) {
				CommandStack stack = (CommandStack) stacks.next();
				stack.markSaveLocation();
			}
			saveLocation = false;
		}

		/**
		 * Flushes every observed command stack and resets the save location to
		 * zero.
		 */
		public void flush() {
			for (Iterator stacks = commandStacks.iterator(); stacks.hasNext();) {
				CommandStack stack = (CommandStack) stacks.next();
				stack.flush();
			}
		}
	}

	/** the <code>CommandStackListener</code> */
	private MultiPageCommandStackListener multiPageCommandStackListener = null;

	/**
	 * Returns the global command stack listener.
	 * 
	 * @return the <code>CommandStackListener</code>
	 */
	protected MultiPageCommandStackListener getMultiPageCommandStackListener() {
		if (null == multiPageCommandStackListener) {
			multiPageCommandStackListener = new MultiPageCommandStackListener();
		}
		return multiPageCommandStackListener;
	}

	/*
	 * @see org.eclipse.ui.ISaveablePart#doSave(org.eclipse.core.runtime.IProgressMonitor)
	 */
	public void doSave(IProgressMonitor monitor) {
		// do the work within an operation because this is a long running
		// activity that modifies the workbench
		WorkspaceModifyOperation operation = new WorkspaceModifyOperation() {
			public void execute(IProgressMonitor monitor) {
				try {
					// modelResource.save(Collections.EMPTY_MAP);
					facesConfigAtrifactEdit.getDeploymentDescriptorResource()
							.save(Collections.EMPTY_MAP);
					IFile file = ((IFileEditorInput) getEditorInput())
							.getFile();
					pageflowPage.doSave(file, monitor);
					sourcePage.doSave(monitor);
					getMultiPageCommandStackListener().markSaveLocations();
				} catch (Exception e) {
					EditorPlugin.getDefault().getLog().log(
							new Status(IStatus.ERROR, EditorPlugin
									.getPluginId(), IStatus.OK,
									e.getMessage() == null ? "" : e
											.getMessage(), e));
				}
			}
		};
		try {
			// commit all pending changes in form pages
			for (Iterator iter = pages.iterator(); iter.hasNext();) {
				Object obj = iter.next();
				if (obj instanceof FormPage) {
					((FormPage) obj).doSave(monitor);
				}
				// else if (obj instanceof PageflowEditor) {
				// ((PageflowEditor) obj).doSave(monitor);
				// }

			}
			operation.run(null);// .run(true, false,
			// operation;
			// runs the operation, and shows progress
			// new ProgressMonitorDialog();

			// refresh the necessary state
			((BasicCommandStack) editingDomain.getCommandStack()).saveIsDone();

			editorDirtyStateChanged();
		} catch (Exception e) {
			EditorPlugin.getDefault().getLog().log(
					new Status(IStatus.ERROR, EditorPlugin.getPluginId(),
							IStatus.OK, e.getMessage(), e));
		}
	}

	public void doSaveAs() {
		SaveAsDialog saveAsDialog = new SaveAsDialog(getSite().getShell());
		saveAsDialog.open();
		IPath path = saveAsDialog.getResult();
		if (path != null) {
			IFile file = ResourcesPlugin.getWorkspace().getRoot().getFile(path);
			if (file != null) {
				doSaveAs(URI.createPlatformResourceURI(file.getFullPath()
						.toString()), new FileEditorInput(file));
			}
		}
	}

	protected void doSaveAs(URI uri, IEditorInput editorInput) {
		((Resource) editingDomain.getResourceSet().getResources().get(0))
				.setURI(uri);
		setInputWithNotify(editorInput);
		setPartName(editorInput.getName());
		IProgressMonitor progressMonitor = getActionBars()
				.getStatusLineManager() != null ? getActionBars()
				.getStatusLineManager().getProgressMonitor()
				: new NullProgressMonitor();
		doSave(progressMonitor);
	}

	public boolean isSaveAsAllowed() {
		// TODO Auto-generated method stub
		return true;
	}

	/**
	 * Returns the <code>TabbedPropertySheetPage</code> for this editor.
	 * 
	 * @return - the <code>TabbedPropertySheetPage</code>
	 */
	protected IPropertySheetPage getPropertySheetPage() {
		return new TabbedPropertySheetPage(
				new ITabbedPropertySheetPageContributor() {

					public String getContributorId() {
						return EDITOR_ID;
					}
				});
	}

	/** the delegating ZoomManager */
	private DelegatingZoomManager delegatingZoomManager = null;

	/**
	 * check whether the input is related with IFile.
	 * 
	 * @param input
	 * @return
	 */
	private boolean isValidInput(IEditorInput input) {
		if (input != null) {
			IFile file = (IFile) input.getAdapter(IResource.class);
			if (file != null) {
				return true;
			}
		}
		return false;
	}

	/**
	 * Returns the <code>DelegatingZoomManager</code> for this editor.
	 * 
	 * @return - the <code>DelegatingZoomManager</code>
	 */
	protected DelegatingZoomManager getDelegatingZoomManager() {
		if (!isValidInput(getEditorInput())) {
			return null;
		}
		if (null == delegatingZoomManager) {
			delegatingZoomManager = new DelegatingZoomManager();
			delegatingZoomManager
					.setCurrentZoomManager((ZoomManager) pageflowPage
							.getAdapter(ZoomManager.class));
		}
		return delegatingZoomManager;
	}

	/** the delegating CommandStack */
	private DelegatingCommandStack delegatingCommandStack = null;

	/**
	 * Returns the <code>CommandStack</code> for this editor.
	 * 
	 * @return - the <code>CommandStack</code>
	 */
	public DelegatingCommandStack getDelegatingCommandStack() {
		if (null == delegatingCommandStack) {
			delegatingCommandStack = new DelegatingCommandStack();
		}
		return delegatingCommandStack;
	}

	/*
	 * @see org.eclipse.core.runtime.IAdaptable#getAdapter(java.lang.Class)
	 */
	public Object getAdapter(Class adapter) {
		if (adapter == IEditingDomainProvider.class) {
			return new IEditingDomainProvider() {
				public EditingDomain getEditingDomain() {
					return editingDomain;
				}
			};
		}
		if (adapter == EditingDomain.class) {
			return editingDomain;
		}
		if (adapter == AdapterFactory.class) {
			return adapterFactory;
		}
		if (adapter == IEditorPart.class) {
			return getActiveEditor();
		}

		if (adapter == CommandStack.class) {
			return getDelegatingCommandStack();
		}
		if (adapter == ZoomManager.class) {
			return getDelegatingZoomManager();
		}

		if (adapter == ActionRegistry.class) {
			return getActionRegistry();
		}
		if (adapter == IGotoMarker.class) {
			return new IGotoMarker() {
				public void gotoMarker(IMarker marker) {
					FacesConfigEditor.this.gotoMarker(marker);
				}
			};
		}
		if (adapter == StructuredTextEditor.class) {
			return sourcePage;
		}

		if (adapter == IContentOutlinePage.class) {
			return getOutlinePage();
		}

		if (adapter == IPropertySheetPage.class) {
			return getPropertySheetPage();
		}

		if (adapter == IProject.class) {
			return getProject();
		}

		if (adapter == CTabFolder.class) {
			return getContainer();
		}

		if (adapter == IOpenPage.class) {
			return new IOpenPage() {

				public void setActiveEditorPage(String pageID) {
					FacesConfigEditor.this.setActiveEditorPage(pageID);

				}
			};
		}

		return super.getAdapter(adapter);
	}

	private EMFCommandStackGEFAdapter sourceCommandStack;

	/**
	 * get or create the source page's GEF command stack based on its EMF
	 * command stack.
	 * 
	 * @return
	 */
	private CommandStack getSourcePageCommandStack() {
		if (sourceCommandStack == null) {
			sourceCommandStack = new EMFCommandStackGEFAdapter(
					(BasicCommandStack) sourcePage.getModel().getUndoManager()
							.getCommandStack());
		}
		return sourceCommandStack;
	}

	/** the list of action ids that are to CommandStack actions */
	// private List stackActionIDs = new ArrayList();
	/** the list of action ids that are editor actions */
	private List editorActionIDs = new ArrayList();

	/**
	 * Adds an editor action to this editor.
	 * <p>
	 * Editor actions are actions that depend and work on the editor.
	 * 
	 * @param action -
	 *            the editor action
	 */
	protected void addEditorAction(EditorPartAction action) {
		getActionRegistry().registerAction(action);
		editorActionIDs.add(action.getId());
	}

	/**
	 * Creates different kinds of actions and registers them to the
	 * ActionRegistry.
	 */
	protected void createActions() {
		// register save action
		addEditorAction(new SaveAction(this));
	}

	/**
	 * Indicates that the current page has changed.
	 * <p>
	 * We update the DelegatingCommandStack, OutlineViewer and other things
	 * here. //
	 */
	protected void currentPageChanged() {
		IEditorPart activeEditor = getActiveEditor();
		if (activeEditor == null) {
			return;
		}

		// update command stack
		CommandStack cmdStack = null;

		if (activeEditor == pageflowPage) {
			cmdStack = (CommandStack) activeEditor
					.getAdapter(CommandStack.class);
		} else if (activeEditor == sourcePage)// other page will delegate the
		// GEF command stack to source
		// page's.
		{
			cmdStack = this.getSourcePageCommandStack();
		}

		// Add command stacks
		getMultiPageCommandStackListener().addCommandStack(cmdStack,
				activeEditor);
		getDelegatingCommandStack().setCurrentCommandStack(cmdStack);

		// enable or disable the actions
		// updateActions(stackActionIDs);

		// update zoom actions
		ZoomManager zoomManager = null;
		zoomManager = (ZoomManager) activeEditor.getAdapter(ZoomManager.class);

		if (zoomManager != null) {
			getDelegatingZoomManager().setCurrentZoomManager(zoomManager);
		}

		IEditorActionBarContributor contributor = getEditorSite()
				.getActionBarContributor();
		if (contributor != null
				&& contributor instanceof FacesConfigActionBarContributor) {
			((FacesConfigActionBarContributor) contributor)
					.setActivePage(activeEditor);
		}
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see MultiPageEditorPart#pageChange(int)
	 */
	protected void pageChange(int newPageIndex) {
		super.pageChange(newPageIndex);
		// getActionBarContributor().setActivePage(getActiveEditor());
		// refresh content depending on current page
		currentPageChanged();
	}

	public void dispose() {
		if (facesConfigAtrifactEdit != null)
			facesConfigAtrifactEdit.dispose();
		ResourcesPlugin.getWorkspace().removeResourceChangeListener(
				resourceChangeListener);

		adapterFactory.dispose();

		if (this.outlinePage != null) {
			outlinePage.dispose();
		}

		super.dispose();
	}

	/**
	 * get the project of the faces config file that the editor is working on.
	 * 
	 * @return
	 */
	public IProject getProject() {
		if (currentProject == null) {
			if (facesConfigAtrifactEdit != null) {
				IFile file = facesConfigAtrifactEdit.getFile();
				if (file != null)
					currentProject = file.getProject();
			}
		}
		return currentProject;
	}

	public EditingDomain getEditingDomain() {
		return editingDomain;
	}

	/**
	 * Returns the <code>IContentOutlinePage</code> for this editor.
	 * 
	 * @return - the <code>IContentOutlinePage</code>
	 */
	protected IContentOutlinePage getOutlinePage() {
		if (null == outlinePage) {
			outlinePage = new MultiPageEditorOutlinePage();
		}
		return outlinePage;
	}

	public void addSelectionChangedListener(ISelectionChangedListener listener) {
		selectionChangedListeners.add(listener);

	}

	public ISelection getSelection() {
		return editorSelection;
	}

	public void removeSelectionChangedListener(
			ISelectionChangedListener listener) {
		selectionChangedListeners.remove(listener);
	}

	public void setSelection(ISelection selection) {
		editorSelection = selection;
		for (Iterator listeners = selectionChangedListeners.iterator(); listeners
				.hasNext();) {
			ISelectionChangedListener listener = (ISelectionChangedListener) listeners
					.next();
			listener
					.selectionChanged(new SelectionChangedEvent(this, selection));
		}
	}

	public void gotoMarker(IMarker marker) {
		setActivePage(sourcePageId);
		IDE.gotoMarker(this.sourcePage, marker);
	}

	public FacesConfigActionBarContributor getActionBarContributor() {
		return (FacesConfigActionBarContributor) getEditorSite()
				.getActionBarContributor();
	}

	public IActionBars getActionBars() {
		return getActionBarContributor().getActionBars();
	}

	/**
	 * Shows a dialog that asks if conflicting changes should be discarded.
	 * 
	 * @generated
	 */
	protected boolean handleDirtyConflict() {
		return MessageDialog
				.openQuestion(
						getSite().getShell(),
						"File Conflict",
						" There are unsaved changes that conflict with changes made outside the editor.  Do you wish to discard this editor's changes?");
	}

	/**
	 * Handles what to do with changed resources on activation.
	 * 
	 * @generated
	 */
	protected void handleChangedResources() {
		if (!changedResources.isEmpty()
				&& (!isDirty() || handleDirtyConflict())) {
			editingDomain.getCommandStack().flush();

			for (Iterator i = changedResources.iterator(); i.hasNext();) {
				Resource resource = (Resource) i.next();
				if (resource.isLoaded()) {
					resource.unload();
					try {
						resource.load(Collections.EMPTY_MAP);
					} catch (IOException exception) {
						EditorPlugin.getDefault().getLog().log(
								new Status(IStatus.ERROR, EditorPlugin
										.getPluginId(), IStatus.OK, exception
										.getMessage() == null ? "" : exception
										.getMessage(), exception));
					}
				}
			}
		}
	}

	public void setActiveEditorPage(String pageID) {
		if (pageID.equals(PageflowEditor.PAGE_ID)) {
			setActivePage(pageflowPageID);
		} else if (pageID.equals(ManagedBeanPage.PAGE_ID)) {
			setActivePage(managedBeanPageID);
		} else if (pageID.equals(ComponentsPage.PAGE_ID)) {
			setActivePage(componentsPageID);
		} else if (pageID.equals(OthersPage.PAGE_ID)) {
			setActivePage(othersPageID);
		}
	}
}