plugins/org.eclipse.jst.j2ee.ui/j2ee_ui/org/eclipse/jst/j2ee/internal/ui/JavaEEDeploymentAssemblyAdvancedSectionBuilder.java - gerrit/jeetools/webtools.javaee - Git at Google

 /*******************************************************************************
  * Copyright (c) 2011 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.jst.j2ee.internal.ui;

 import java.util.ArrayList;
 import java.util.HashSet;
 import java.util.LinkedHashSet;
 import java.util.List;
 import java.util.Set;

 import org.eclipse.core.resources.IFile;
 import org.eclipse.core.resources.IFolder;
 import org.eclipse.core.resources.IProject;
 import org.eclipse.core.runtime.IPath;
 import org.eclipse.core.runtime.IStatus;
 import org.eclipse.core.runtime.MultiStatus;
 import org.eclipse.core.runtime.Path;
 import org.eclipse.core.runtime.Status;
 import org.eclipse.jface.resource.JFaceResources;
 import org.eclipse.jst.j2ee.componentcore.J2EEModuleVirtualComponent;
 import org.eclipse.jst.j2ee.internal.J2EEConstants;
 import org.eclipse.jst.j2ee.internal.plugin.J2EEUIPlugin;
 import org.eclipse.jst.j2ee.project.JavaEEProjectUtilities;
 import org.eclipse.jst.j2ee.project.facet.IJ2EEFacetConstants;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.custom.ScrolledComposite;
 import org.eclipse.swt.events.SelectionEvent;
 import org.eclipse.swt.events.SelectionListener;
 import org.eclipse.swt.layout.GridData;
 import org.eclipse.swt.layout.GridLayout;
 import org.eclipse.swt.widgets.Combo;
 import org.eclipse.swt.widgets.Composite;
 import org.eclipse.swt.widgets.Control;
 import org.eclipse.swt.widgets.Label;
 import org.eclipse.ui.forms.events.ExpansionAdapter;
 import org.eclipse.ui.forms.events.ExpansionEvent;
 import org.eclipse.ui.forms.widgets.ExpandableComposite;
 import org.eclipse.wst.common.componentcore.internal.ComponentResource;
 import org.eclipse.wst.common.componentcore.internal.StructureEdit;
 import org.eclipse.wst.common.componentcore.internal.WorkbenchComponent;
 import org.eclipse.wst.common.componentcore.internal.impl.TaskModel;
 import org.eclipse.wst.common.componentcore.resources.IVirtualComponent;
 import org.eclipse.wst.common.componentcore.resources.IVirtualFolder;
 import org.eclipse.wst.common.componentcore.ui.internal.propertypage.ResourceMappingFilterExtensionRegistry;
 import org.eclipse.wst.common.componentcore.ui.propertypage.AddModuleDependenciesPropertiesPage;
 import org.eclipse.wst.common.componentcore.ui.propertypage.AddModuleDependenciesPropertiesPage.ComponentResourceProxy;
 import org.eclipse.wst.common.componentcore.ui.propertypage.IReferenceWizardConstants;

 /**
  * This is a helper class to build and handle the logic of the "Advanced" section
  * of the Deployment Assembly page that is common to all the Java EE modules (EAR
  * project, Web project, etc.)
  *
  */

 public class JavaEEDeploymentAssemblyAdvancedSectionBuilder implements IJavaEEDeploymentAssemblySectionBuilder, SelectionListener {

 	private Label defaulDDFolderLabel;
 	private Combo rootSourceMappings;

 	private IVirtualComponent rootComponent;
 	private AddModuleDependenciesPropertiesPage page;
 	private String currentSelectedDDFolder = null;
 	private List<String> resourceMappingsList = new ArrayList<String>();
 	boolean shouldDisplaySection;

 	String folderToLook;
 	String fileToLook;
 	String projectType;


 	public JavaEEDeploymentAssemblyAdvancedSectionBuilder(IVirtualComponent component, AddModuleDependenciesPropertiesPage page){
 		rootComponent = component;
 		this.page = page;
 		shouldDisplaySection = !JavaEEProjectUtilities.isUtilityProject(rootComponent.getProject());
 		IVirtualFolder rootFolder = rootComponent.getRootFolder();
 		IPath defaultDDFolder = J2EEModuleVirtualComponent.getDefaultDeploymentDescriptorFolder(rootFolder);
 		shouldDisplaySection &= (defaultDDFolder == null);
 		projectType = JavaEEProjectUtilities.getJ2EEProjectType(component.getProject());
 		if (projectType.equals(IJ2EEFacetConstants.APPLICATION_CLIENT))	{
 			folderToLook = J2EEConstants.META_INF;
 			fileToLook = J2EEConstants.APP_CLIENT_DD_URI;
 		}
 		else if (projectType.equals(IJ2EEFacetConstants.JCA)) {
 			folderToLook = J2EEConstants.META_INF;
 			fileToLook = J2EEConstants.RAR_DD_URI;
 		}
 		else if	(projectType.equals(IJ2EEFacetConstants.EJB)){
 			folderToLook = J2EEConstants.META_INF;
 			fileToLook = J2EEConstants.EJBJAR_DD_URI;
 		}
 		else if (projectType.equals(IJ2EEFacetConstants.DYNAMIC_WEB)) {
 			folderToLook = J2EEConstants.WEB_INF;
 			fileToLook = J2EEConstants.WEBAPP_DD_URI;
 		}
 		else if (projectType.equals(IJ2EEFacetConstants.ENTERPRISE_APPLICATION)) {
 			folderToLook = J2EEConstants.META_INF;
 			fileToLook = J2EEConstants.APPLICATION_DD_URI;
 		}
 		else if (projectType.equals(IJ2EEFacetConstants.WEBFRAGMENT)) {
 			folderToLook = J2EEConstants.META_INF;
 			fileToLook = J2EEConstants.WEBFRAGMENT_DD_URI;
 		}
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.jst.j2ee.internal.ui.IJavaEEDeploymentAssemblySectionBuilder#buildSection(org.eclipse.swt.widgets.Composite)
 	 */
 	public void buildSection(Composite parent){
 		if (shouldDisplaySection()) {
 			Composite advancedSectionComposite = createAdvancedSection(parent);
 			addDefaultDeploymentDescriptorFolderFields(advancedSectionComposite);
 		}
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.jst.j2ee.internal.ui.IJavaEEDeploymentAssemblySectionBuilder#loadContents()
 	 */
 	public void loadContents(){
 		if (shouldDisplaySection()){
 			loadDefaultDeploymentDescriptorFolderContents();
 		}
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.jst.j2ee.internal.ui.IJavaEEDeploymentAssemblySectionBuilder#saveContents()
 	 */
 	public boolean saveContents(){
 		boolean success = true;
 		if (shouldDisplaySection()){
 			success = saveDefaultDeploymentDescriptorFolderContents();
 			loadContents();
 		}
 		return success;
 	}


 	private void loadDefaultDeploymentDescriptorFolderContents(){
 		resourceMappingsList.clear();
 		// First, retrieve all the mappings to root. Assume there are no duplicated mappings.
 		IPath[] allRootMappings = findAllRootMappings();
 		// Now, see if any of that is tagged as default root mapping
 		IVirtualFolder rootFolder = rootComponent.getRootFolder();
 		IPath defaultDDFolder = J2EEModuleVirtualComponent.getDefaultDeploymentDescriptorFolder(rootFolder);

 		currentSelectedDDFolder = defaultDDFolder == null?null:defaultDDFolder.toString();

 		for (IPath mapping:allRootMappings){
 			resourceMappingsList.add(mapping.toString());
 		}

 		updateSourceMappingsCombo(currentSelectedDDFolder, resourceMappingsList);
 	}


 	private List<String> filterMappings(List <String> mappings){
 		Set<String> mappingWithDD = new HashSet<String>();
 		Set<String> mappingWithFolder = new HashSet<String>();

 		IProject project = this.rootComponent.getProject();
 		for (String mapping :mappings){
 			if (fileToLook != null && !fileToLook.equals("")){ //$NON-NLS-1$
 				IFile ddFile = project.getFile(new Path(mapping).addTrailingSeparator() + fileToLook);
 				if (ddFile != null && ddFile.exists()){
 					mappingWithDD.add(mapping);
 				}
 			}
 			if (folderToLook != null && !folderToLook.equals("")){ //$NON-NLS-1$
 				IFolder ddFolder = project.getFolder(new Path(mapping).addTrailingSeparator() + folderToLook);
 				if (ddFolder != null && ddFolder.exists()){
 					mappingWithFolder.add(mapping);
 				}
 			}
 		}
 		if (!mappingWithDD.isEmpty()){
 			// return only the mappings that contain a DD file.
 			return new ArrayList<String>(mappingWithDD);
 		}
 		return  new ArrayList<String>(mappingWithFolder);
 	}

 	private void updateSourceMappingsCombo(String selectedDDFolder, List<String> resourceMappings) {

 		List<String> filteredMappings = filterMappings(resourceMappings);

 		ArrayList<String> tmpList = new ArrayList<String>(filteredMappings);
 		if (selectedDDFolder == null){
 			tmpList.add(0, Messages.J2EEModuleDependenciesPropertyPage_ADVANCED_NODEFAULTDDFOLDER);
 		}
 		rootSourceMappings.setItems(tmpList.toArray(new String[]{}));
 		if (selectedDDFolder == null){
 			//No tagged source folder, so select "None"
 			rootSourceMappings.select(tmpList.indexOf(Messages.J2EEModuleDependenciesPropertyPage_ADVANCED_NODEFAULTDDFOLDER));
 		}
 		else {
 			rootSourceMappings.select(tmpList.indexOf(selectedDDFolder.toString()));
 		}
 	}

 	private boolean saveDefaultDeploymentDescriptorFolderContents(){
 		if (currentSelectedDDFolder != null){
 			IVirtualFolder rootFolder = rootComponent.getRootFolder();
 			J2EEModuleVirtualComponent.setDefaultDeploymentDescriptorFolder(rootFolder, new Path(currentSelectedDDFolder), null);
 		}
 		return true;
 	}

 	private IPath[] findAllRootMappings(){

 		StructureEdit structureEdit = null;
 		try {
 			structureEdit = StructureEdit.getStructureEditForRead(rootComponent.getProject());
 			WorkbenchComponent component = structureEdit.getComponent();
 			Object[] arr = component.getResources().toArray();
 			Set <IPath> result = new LinkedHashSet<IPath>();
 			for( int i = 0; i < arr.length; i++ ){
 				ComponentResource resource = (ComponentResource)arr[i];
 				if (resource.getRuntimePath().equals(IVirtualComponent.ROOT) && !ResourceMappingFilterExtensionRegistry.shouldFilter(resource.getSourcePath())){
 					result.add(((ComponentResource)arr[i]).getSourcePath());
 				}
 			}
 			return result.toArray(new IPath[]{});
 		} catch (NullPointerException e) {
 			J2EEUIPlugin.logError(e);
 		} finally {
 			if(structureEdit != null)
 				structureEdit.dispose();
 		}
 		return new IPath[]{};
 	}

 	protected boolean shouldDisplaySection(){
 		return shouldDisplaySection;
 	}

 	/*
 	 * Creates the Advanced section. Returns the composite to which all the other
 	 * widgets should be added.
 	 */
 	private Composite createAdvancedSection(Composite parent){

 		// Build the expandable composite
 		ExpandableComposite excomposite = new ExpandableComposite(parent, SWT.NONE, ExpandableComposite.TWISTIE
 		| ExpandableComposite.CLIENT_INDENT | ExpandableComposite.COMPACT);
 		excomposite.setText(Messages.J2EEModuleDependenciesPropertyPage_ADVANCED);
 		excomposite.setExpanded(false);
 		excomposite.setFont(JFaceResources.getFontRegistry().getBold(JFaceResources.DIALOG_FONT));
 		excomposite.setLayoutData(new GridData(GridData.FILL, GridData.FILL, true, false, 1, 1));
 		excomposite.addExpansionListener(new ExpansionAdapter() {
 			@Override
 			public void expansionStateChanged(ExpansionEvent e) {
 				expandedStateChanged((ExpandableComposite) e.getSource());
 			}
 		});

 		// Build the composite has the contents of the expandable widget
 		Composite innerComposite = new Composite(excomposite, SWT.NONE);
 		excomposite.setClient(innerComposite);
 		GridLayout gl = new GridLayout(2, false);
 		gl.marginHeight = 0;
 		gl.marginWidth = 0;
 		innerComposite.setLayout(gl);
 		return innerComposite;
 	}

 	private void addDefaultDeploymentDescriptorFolderFields(Composite parent) {
 		defaulDDFolderLabel = new Label(parent, SWT.NONE);
 		defaulDDFolderLabel.setText(Messages.J2EEModuleDependenciesPropertyPage_ADVANCED_DDFOLDER);
 		rootSourceMappings = new Combo(parent, SWT.READ_ONLY);
 		rootSourceMappings.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
 		rootSourceMappings.addSelectionListener(this);
 	}


 	private final void expandedStateChanged(ExpandableComposite expandable) {
 		// Get the scrolled composite of the deployment assembly page, and the child
 		// composite of this scrolled composite that contains the expandable composite
 		Composite[] composites = getCompositesToResize(expandable);
 		ScrolledComposite parentScrolledComposite = (ScrolledComposite)composites[0];
 		Composite childComposite = composites[1];
 		if (parentScrolledComposite != null && childComposite != null) {
 			parentScrolledComposite.layout(true, true);
 			// Resize the scrolled composite so the scroll bars are shown if necessary
 			parentScrolledComposite.setMinSize(childComposite.computeSize(SWT.DEFAULT, SWT.DEFAULT, true));

 		}
 	}

 	/*
 	 * Returns an array of composites used to resize the deployment assembly page
 	 * when the advanced section is expanded.
 	 * The first element is the scrolled composite (instance of ScrolledComposite) of the
 	 * deployment assembly page
 	 * The second element is the composite with the contents of the deployment assembly page
 	 */
 	private Composite[] getCompositesToResize(Control control) {
 		Control parent = control.getParent();
 		Control previousParent = null;
 		Composite[] result = new Composite[2];
 		while (!(parent instanceof ScrolledComposite) && parent != null) {
 			previousParent = parent;
 			parent = parent.getParent();
 		}
 		if (parent instanceof ScrolledComposite) {
 			result[0] = (ScrolledComposite)parent;
 		}
 		if (previousParent instanceof Composite) {
 			result[1] = (Composite)previousParent;
 		}
 		return result;
 	}

 	public void directiveAdded(Object element) {
 		if (shouldDisplaySection()){
 			if (!(element instanceof TaskModel))
 				return;
 			TaskModel model = (TaskModel)element;
 			final Object folderMapping = model.getObject(IReferenceWizardConstants.FOLDER_MAPPING);
 			if( folderMapping != null && folderMapping instanceof ComponentResourceProxy){
 				ComponentResourceProxy proxy = (ComponentResourceProxy)folderMapping;
 				//if ((proxy.runtimePath.equals(IVirtualComponent.ROOT) && !resourceMappingsList.contains(proxy.source.toString()))){
 				if ((proxy.runtimePath.equals(IVirtualComponent.ROOT))){
 					resourceMappingsList.add(proxy.source.toString());
 					updateSourceMappingsCombo(currentSelectedDDFolder, resourceMappingsList);
 				}
 			}
 		}
 	}

 	public void directiveRemoved(Object element) {
 		if (shouldDisplaySection()){
 			if( element instanceof ComponentResourceProxy){
 				ComponentResourceProxy proxy = (ComponentResourceProxy)element;
 				if (proxy.runtimePath.equals(IVirtualComponent.ROOT)){
 					String proxySource = proxy.source.toString();
 					if (resourceMappingsList.contains(proxySource)){
 						resourceMappingsList.remove(proxySource);
 						if (proxySource.equals(currentSelectedDDFolder)){
 							currentSelectedDDFolder = null;
 						}
 						updateSourceMappingsCombo(currentSelectedDDFolder, resourceMappingsList);
 					}
 				}
 			}
 		}
 	}

 	public void widgetDefaultSelected(SelectionEvent event) {
 		// Intentionally left blank

 	}

 	public void widgetSelected(SelectionEvent event) {
 		if (event.getSource() == rootSourceMappings){
 			String tmp = rootSourceMappings.getText();
 			if (tmp != null){
 				if (tmp.equals(Messages.J2EEModuleDependenciesPropertyPage_ADVANCED_NODEFAULTDDFOLDER) && currentSelectedDDFolder == null){
 					// Do nothing, because the value did not change.
 					return;
 				}
 				if (tmp.equals(Messages.J2EEModuleDependenciesPropertyPage_ADVANCED_NODEFAULTDDFOLDER)){
 					// This means the user selected None, but there was already a value selected (this should not happen)
 					J2EEUIPlugin.logWarning("Unexpected condition when validating deployment descriptor folder"); //$NON-NLS-1$
 					return;
 				}
 				// We now the user selected something different from None, so remove this item so it cannot be selected again
 				if (rootSourceMappings.indexOf(Messages.J2EEModuleDependenciesPropertyPage_ADVANCED_NODEFAULTDDFOLDER) != -1)
 					rootSourceMappings.remove(Messages.J2EEModuleDependenciesPropertyPage_ADVANCED_NODEFAULTDDFOLDER);
 				// Only refresh if changing from None to a folder
 				boolean shouldRefresh = (currentSelectedDDFolder == null);
 				if (!tmp.equals(currentSelectedDDFolder)){
 					currentSelectedDDFolder = tmp;
 					if (shouldRefresh)
 						page.refresh();
 				}
 			}
 		}

 	}

 	public IStatus validate(IStatus currentStatus) {
 		IStatus status = currentStatus!=null?currentStatus:Status.OK_STATUS;
 		if (shouldDisplaySection()){
 			if (currentSelectedDDFolder == null && resourceMappingsList.size()>1){
 				// Only show the warning if none of the root mappings is selected and there are more than 1 root mapping
 				int severity = Status.WARNING;
 				status = appendStatusMessage(status, Messages.J2EEModuleDependenciesPropertyPage_ADVANCED_NODEFAULTDDFOLDERWARNING, severity);
 			}
 		}
 		return status;
 	}
 	private IStatus appendStatusMessage(IStatus existingStatus, String message, int severity) {
         MultiStatus multiStatus;
         IStatus newStatus = new Status(severity, J2EEUIPlugin.PLUGIN_ID, message);
 		int newSeverity = severity;
 		if(existingStatus.getSeverity() > severity)
 			newSeverity = existingStatus.getSeverity();
         if(existingStatus instanceof MultiStatus){
             multiStatus = (MultiStatus)existingStatus;
             multiStatus.merge(newStatus);
         } else {
         	if(!existingStatus.isMultiStatus() && existingStatus.isOK()) {
         		return newStatus;
         	}
             IStatus [] children = new IStatus [] {existingStatus, newStatus};
             multiStatus = new MultiStatus(J2EEUIPlugin.PLUGIN_ID, newSeverity, children, null, null);
         }
         return multiStatus;
     }

 	public void componentResourceModified(ComponentResourceProxy originalResource, ComponentResourceProxy modifiedResource) {
 		if (shouldDisplaySection()){
 			// We are interested only in two cases:
 			// 1. When the deploy path changes from / to any other thing...
 			if (originalResource.runtimePath.isRoot() && !modifiedResource.runtimePath.isRoot()){
 				resourceMappingsList.remove(originalResource.source.toString());
 				if (originalResource.source.toString().equals(currentSelectedDDFolder)){
 					currentSelectedDDFolder = null;
 				}
 				updateSourceMappingsCombo(currentSelectedDDFolder, resourceMappingsList);
 				page.refresh();
 			}
 			// 2. When the deploy path changes from any thing to /
 			else if (!originalResource.runtimePath.isRoot() && modifiedResource.runtimePath.isRoot()){
 				resourceMappingsList.add(originalResource.source.toString());
 				updateSourceMappingsCombo(currentSelectedDDFolder, resourceMappingsList);
 				page.refresh();
 			}
 		}
 	}
 }
	/*******************************************************************************
	* Copyright (c) 2011 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.jst.j2ee.internal.ui;

	import java.util.ArrayList;
	import java.util.HashSet;
	import java.util.LinkedHashSet;
	import java.util.List;
	import java.util.Set;

	import org.eclipse.core.resources.IFile;
	import org.eclipse.core.resources.IFolder;
	import org.eclipse.core.resources.IProject;
	import org.eclipse.core.runtime.IPath;
	import org.eclipse.core.runtime.IStatus;
	import org.eclipse.core.runtime.MultiStatus;
	import org.eclipse.core.runtime.Path;
	import org.eclipse.core.runtime.Status;
	import org.eclipse.jface.resource.JFaceResources;
	import org.eclipse.jst.j2ee.componentcore.J2EEModuleVirtualComponent;
	import org.eclipse.jst.j2ee.internal.J2EEConstants;
	import org.eclipse.jst.j2ee.internal.plugin.J2EEUIPlugin;
	import org.eclipse.jst.j2ee.project.JavaEEProjectUtilities;
	import org.eclipse.jst.j2ee.project.facet.IJ2EEFacetConstants;
	import org.eclipse.swt.SWT;
	import org.eclipse.swt.custom.ScrolledComposite;
	import org.eclipse.swt.events.SelectionEvent;
	import org.eclipse.swt.events.SelectionListener;
	import org.eclipse.swt.layout.GridData;
	import org.eclipse.swt.layout.GridLayout;
	import org.eclipse.swt.widgets.Combo;
	import org.eclipse.swt.widgets.Composite;
	import org.eclipse.swt.widgets.Control;
	import org.eclipse.swt.widgets.Label;
	import org.eclipse.ui.forms.events.ExpansionAdapter;
	import org.eclipse.ui.forms.events.ExpansionEvent;
	import org.eclipse.ui.forms.widgets.ExpandableComposite;
	import org.eclipse.wst.common.componentcore.internal.ComponentResource;
	import org.eclipse.wst.common.componentcore.internal.StructureEdit;
	import org.eclipse.wst.common.componentcore.internal.WorkbenchComponent;
	import org.eclipse.wst.common.componentcore.internal.impl.TaskModel;
	import org.eclipse.wst.common.componentcore.resources.IVirtualComponent;
	import org.eclipse.wst.common.componentcore.resources.IVirtualFolder;
	import org.eclipse.wst.common.componentcore.ui.internal.propertypage.ResourceMappingFilterExtensionRegistry;
	import org.eclipse.wst.common.componentcore.ui.propertypage.AddModuleDependenciesPropertiesPage;
	import org.eclipse.wst.common.componentcore.ui.propertypage.AddModuleDependenciesPropertiesPage.ComponentResourceProxy;
	import org.eclipse.wst.common.componentcore.ui.propertypage.IReferenceWizardConstants;

	/**
	* This is a helper class to build and handle the logic of the "Advanced" section
	* of the Deployment Assembly page that is common to all the Java EE modules (EAR
	* project, Web project, etc.)
	*
	*/

	public class JavaEEDeploymentAssemblyAdvancedSectionBuilder implements IJavaEEDeploymentAssemblySectionBuilder, SelectionListener {

	private Label defaulDDFolderLabel;
	private Combo rootSourceMappings;

	private IVirtualComponent rootComponent;
	private AddModuleDependenciesPropertiesPage page;
	private String currentSelectedDDFolder = null;
	private List<String> resourceMappingsList = new ArrayList<String>();
	boolean shouldDisplaySection;

	String folderToLook;
	String fileToLook;
	String projectType;


	public JavaEEDeploymentAssemblyAdvancedSectionBuilder(IVirtualComponent component, AddModuleDependenciesPropertiesPage page){
	rootComponent = component;
	this.page = page;
	shouldDisplaySection = !JavaEEProjectUtilities.isUtilityProject(rootComponent.getProject());
	IVirtualFolder rootFolder = rootComponent.getRootFolder();
	IPath defaultDDFolder = J2EEModuleVirtualComponent.getDefaultDeploymentDescriptorFolder(rootFolder);
	shouldDisplaySection &= (defaultDDFolder == null);
	projectType = JavaEEProjectUtilities.getJ2EEProjectType(component.getProject());
	if (projectType.equals(IJ2EEFacetConstants.APPLICATION_CLIENT)) {
	folderToLook = J2EEConstants.META_INF;
	fileToLook = J2EEConstants.APP_CLIENT_DD_URI;
	}
	else if (projectType.equals(IJ2EEFacetConstants.JCA)) {
	folderToLook = J2EEConstants.META_INF;
	fileToLook = J2EEConstants.RAR_DD_URI;
	}
	else if (projectType.equals(IJ2EEFacetConstants.EJB)){
	folderToLook = J2EEConstants.META_INF;
	fileToLook = J2EEConstants.EJBJAR_DD_URI;
	}
	else if (projectType.equals(IJ2EEFacetConstants.DYNAMIC_WEB)) {
	folderToLook = J2EEConstants.WEB_INF;
	fileToLook = J2EEConstants.WEBAPP_DD_URI;
	}
	else if (projectType.equals(IJ2EEFacetConstants.ENTERPRISE_APPLICATION)) {
	folderToLook = J2EEConstants.META_INF;
	fileToLook = J2EEConstants.APPLICATION_DD_URI;
	}
	else if (projectType.equals(IJ2EEFacetConstants.WEBFRAGMENT)) {
	folderToLook = J2EEConstants.META_INF;
	fileToLook = J2EEConstants.WEBFRAGMENT_DD_URI;
	}
	}

	/* (non-Javadoc)
	* @see org.eclipse.jst.j2ee.internal.ui.IJavaEEDeploymentAssemblySectionBuilder#buildSection(org.eclipse.swt.widgets.Composite)
	*/
	public void buildSection(Composite parent){
	if (shouldDisplaySection()) {
	Composite advancedSectionComposite = createAdvancedSection(parent);
	addDefaultDeploymentDescriptorFolderFields(advancedSectionComposite);
	}
	}

	/* (non-Javadoc)
	* @see org.eclipse.jst.j2ee.internal.ui.IJavaEEDeploymentAssemblySectionBuilder#loadContents()
	*/
	public void loadContents(){
	if (shouldDisplaySection()){
	loadDefaultDeploymentDescriptorFolderContents();
	}
	}

	/* (non-Javadoc)
	* @see org.eclipse.jst.j2ee.internal.ui.IJavaEEDeploymentAssemblySectionBuilder#saveContents()
	*/
	public boolean saveContents(){
	boolean success = true;
	if (shouldDisplaySection()){
	success = saveDefaultDeploymentDescriptorFolderContents();
	loadContents();
	}
	return success;
	}


	private void loadDefaultDeploymentDescriptorFolderContents(){
	resourceMappingsList.clear();
	// First, retrieve all the mappings to root. Assume there are no duplicated mappings.
	IPath[] allRootMappings = findAllRootMappings();
	// Now, see if any of that is tagged as default root mapping
	IVirtualFolder rootFolder = rootComponent.getRootFolder();
	IPath defaultDDFolder = J2EEModuleVirtualComponent.getDefaultDeploymentDescriptorFolder(rootFolder);

	currentSelectedDDFolder = defaultDDFolder == null?null:defaultDDFolder.toString();

	for (IPath mapping:allRootMappings){
	resourceMappingsList.add(mapping.toString());
	}

	updateSourceMappingsCombo(currentSelectedDDFolder, resourceMappingsList);
	}


	private List<String> filterMappings(List <String> mappings){
	Set<String> mappingWithDD = new HashSet<String>();
	Set<String> mappingWithFolder = new HashSet<String>();

	IProject project = this.rootComponent.getProject();
	for (String mapping :mappings){
	if (fileToLook != null && !fileToLook.equals("")){ //$NON-NLS-1$
	IFile ddFile = project.getFile(new Path(mapping).addTrailingSeparator() + fileToLook);
	if (ddFile != null && ddFile.exists()){
	mappingWithDD.add(mapping);
	}
	}
	if (folderToLook != null && !folderToLook.equals("")){ //$NON-NLS-1$
	IFolder ddFolder = project.getFolder(new Path(mapping).addTrailingSeparator() + folderToLook);
	if (ddFolder != null && ddFolder.exists()){
	mappingWithFolder.add(mapping);
	}
	}
	}
	if (!mappingWithDD.isEmpty()){
	// return only the mappings that contain a DD file.
	return new ArrayList<String>(mappingWithDD);
	}
	return new ArrayList<String>(mappingWithFolder);
	}

	private void updateSourceMappingsCombo(String selectedDDFolder, List<String> resourceMappings) {

	List<String> filteredMappings = filterMappings(resourceMappings);

	ArrayList<String> tmpList = new ArrayList<String>(filteredMappings);
	if (selectedDDFolder == null){
	tmpList.add(0, Messages.J2EEModuleDependenciesPropertyPage_ADVANCED_NODEFAULTDDFOLDER);
	}
	rootSourceMappings.setItems(tmpList.toArray(new String[]{}));
	if (selectedDDFolder == null){
	//No tagged source folder, so select "None"
	rootSourceMappings.select(tmpList.indexOf(Messages.J2EEModuleDependenciesPropertyPage_ADVANCED_NODEFAULTDDFOLDER));
	}
	else {
	rootSourceMappings.select(tmpList.indexOf(selectedDDFolder.toString()));
	}
	}

	private boolean saveDefaultDeploymentDescriptorFolderContents(){
	if (currentSelectedDDFolder != null){
	IVirtualFolder rootFolder = rootComponent.getRootFolder();
	J2EEModuleVirtualComponent.setDefaultDeploymentDescriptorFolder(rootFolder, new Path(currentSelectedDDFolder), null);
	}
	return true;
	}

	private IPath[] findAllRootMappings(){

	StructureEdit structureEdit = null;
	try {
	structureEdit = StructureEdit.getStructureEditForRead(rootComponent.getProject());
	WorkbenchComponent component = structureEdit.getComponent();
	Object[] arr = component.getResources().toArray();
	Set <IPath> result = new LinkedHashSet<IPath>();
	for( int i = 0; i < arr.length; i++ ){
	ComponentResource resource = (ComponentResource)arr[i];
	if (resource.getRuntimePath().equals(IVirtualComponent.ROOT) && !ResourceMappingFilterExtensionRegistry.shouldFilter(resource.getSourcePath())){
	result.add(((ComponentResource)arr[i]).getSourcePath());
	}
	}
	return result.toArray(new IPath[]{});
	} catch (NullPointerException e) {
	J2EEUIPlugin.logError(e);
	} finally {
	if(structureEdit != null)
	structureEdit.dispose();
	}
	return new IPath[]{};
	}

	protected boolean shouldDisplaySection(){
	return shouldDisplaySection;
	}

	/*
	* Creates the Advanced section. Returns the composite to which all the other
	* widgets should be added.
	*/
	private Composite createAdvancedSection(Composite parent){

	// Build the expandable composite
	ExpandableComposite excomposite = new ExpandableComposite(parent, SWT.NONE, ExpandableComposite.TWISTIE
	\| ExpandableComposite.CLIENT_INDENT \| ExpandableComposite.COMPACT);
	excomposite.setText(Messages.J2EEModuleDependenciesPropertyPage_ADVANCED);
	excomposite.setExpanded(false);
	excomposite.setFont(JFaceResources.getFontRegistry().getBold(JFaceResources.DIALOG_FONT));
	excomposite.setLayoutData(new GridData(GridData.FILL, GridData.FILL, true, false, 1, 1));
	excomposite.addExpansionListener(new ExpansionAdapter() {
	@Override
	public void expansionStateChanged(ExpansionEvent e) {
	expandedStateChanged((ExpandableComposite) e.getSource());
	}
	});

	// Build the composite has the contents of the expandable widget
	Composite innerComposite = new Composite(excomposite, SWT.NONE);
	excomposite.setClient(innerComposite);
	GridLayout gl = new GridLayout(2, false);
	gl.marginHeight = 0;
	gl.marginWidth = 0;
	innerComposite.setLayout(gl);
	return innerComposite;
	}

	private void addDefaultDeploymentDescriptorFolderFields(Composite parent) {
	defaulDDFolderLabel = new Label(parent, SWT.NONE);
	defaulDDFolderLabel.setText(Messages.J2EEModuleDependenciesPropertyPage_ADVANCED_DDFOLDER);
	rootSourceMappings = new Combo(parent, SWT.READ_ONLY);
	rootSourceMappings.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
	rootSourceMappings.addSelectionListener(this);
	}


	private final void expandedStateChanged(ExpandableComposite expandable) {
	// Get the scrolled composite of the deployment assembly page, and the child
	// composite of this scrolled composite that contains the expandable composite
	Composite[] composites = getCompositesToResize(expandable);
	ScrolledComposite parentScrolledComposite = (ScrolledComposite)composites[0];
	Composite childComposite = composites[1];
	if (parentScrolledComposite != null && childComposite != null) {
	parentScrolledComposite.layout(true, true);
	// Resize the scrolled composite so the scroll bars are shown if necessary
	parentScrolledComposite.setMinSize(childComposite.computeSize(SWT.DEFAULT, SWT.DEFAULT, true));

	}
	}

	/*
	* Returns an array of composites used to resize the deployment assembly page
	* when the advanced section is expanded.
	* The first element is the scrolled composite (instance of ScrolledComposite) of the
	* deployment assembly page
	* The second element is the composite with the contents of the deployment assembly page
	*/
	private Composite[] getCompositesToResize(Control control) {
	Control parent = control.getParent();
	Control previousParent = null;
	Composite[] result = new Composite[2];
	while (!(parent instanceof ScrolledComposite) && parent != null) {
	previousParent = parent;
	parent = parent.getParent();
	}
	if (parent instanceof ScrolledComposite) {
	result[0] = (ScrolledComposite)parent;
	}
	if (previousParent instanceof Composite) {
	result[1] = (Composite)previousParent;
	}
	return result;
	}

	public void directiveAdded(Object element) {
	if (shouldDisplaySection()){
	if (!(element instanceof TaskModel))
	return;
	TaskModel model = (TaskModel)element;
	final Object folderMapping = model.getObject(IReferenceWizardConstants.FOLDER_MAPPING);
	if( folderMapping != null && folderMapping instanceof ComponentResourceProxy){
	ComponentResourceProxy proxy = (ComponentResourceProxy)folderMapping;
	//if ((proxy.runtimePath.equals(IVirtualComponent.ROOT) && !resourceMappingsList.contains(proxy.source.toString()))){
	if ((proxy.runtimePath.equals(IVirtualComponent.ROOT))){
	resourceMappingsList.add(proxy.source.toString());
	updateSourceMappingsCombo(currentSelectedDDFolder, resourceMappingsList);
	}
	}
	}
	}

	public void directiveRemoved(Object element) {
	if (shouldDisplaySection()){
	if( element instanceof ComponentResourceProxy){
	ComponentResourceProxy proxy = (ComponentResourceProxy)element;
	if (proxy.runtimePath.equals(IVirtualComponent.ROOT)){
	String proxySource = proxy.source.toString();
	if (resourceMappingsList.contains(proxySource)){
	resourceMappingsList.remove(proxySource);
	if (proxySource.equals(currentSelectedDDFolder)){
	currentSelectedDDFolder = null;
	}
	updateSourceMappingsCombo(currentSelectedDDFolder, resourceMappingsList);
	}
	}
	}
	}
	}

	public void widgetDefaultSelected(SelectionEvent event) {
	// Intentionally left blank

	}

	public void widgetSelected(SelectionEvent event) {
	if (event.getSource() == rootSourceMappings){
	String tmp = rootSourceMappings.getText();
	if (tmp != null){
	if (tmp.equals(Messages.J2EEModuleDependenciesPropertyPage_ADVANCED_NODEFAULTDDFOLDER) && currentSelectedDDFolder == null){
	// Do nothing, because the value did not change.
	return;
	}
	if (tmp.equals(Messages.J2EEModuleDependenciesPropertyPage_ADVANCED_NODEFAULTDDFOLDER)){
	// This means the user selected None, but there was already a value selected (this should not happen)
	J2EEUIPlugin.logWarning("Unexpected condition when validating deployment descriptor folder"); //$NON-NLS-1$
	return;
	}
	// We now the user selected something different from None, so remove this item so it cannot be selected again
	if (rootSourceMappings.indexOf(Messages.J2EEModuleDependenciesPropertyPage_ADVANCED_NODEFAULTDDFOLDER) != -1)
	rootSourceMappings.remove(Messages.J2EEModuleDependenciesPropertyPage_ADVANCED_NODEFAULTDDFOLDER);
	// Only refresh if changing from None to a folder
	boolean shouldRefresh = (currentSelectedDDFolder == null);
	if (!tmp.equals(currentSelectedDDFolder)){
	currentSelectedDDFolder = tmp;
	if (shouldRefresh)
	page.refresh();
	}
	}
	}

	}

	public IStatus validate(IStatus currentStatus) {
	IStatus status = currentStatus!=null?currentStatus:Status.OK_STATUS;
	if (shouldDisplaySection()){
	if (currentSelectedDDFolder == null && resourceMappingsList.size()>1){
	// Only show the warning if none of the root mappings is selected and there are more than 1 root mapping
	int severity = Status.WARNING;
	status = appendStatusMessage(status, Messages.J2EEModuleDependenciesPropertyPage_ADVANCED_NODEFAULTDDFOLDERWARNING, severity);
	}
	}
	return status;
	}
	private IStatus appendStatusMessage(IStatus existingStatus, String message, int severity) {
	MultiStatus multiStatus;
	IStatus newStatus = new Status(severity, J2EEUIPlugin.PLUGIN_ID, message);
	int newSeverity = severity;
	if(existingStatus.getSeverity() > severity)
	newSeverity = existingStatus.getSeverity();
	if(existingStatus instanceof MultiStatus){
	multiStatus = (MultiStatus)existingStatus;
	multiStatus.merge(newStatus);
	} else {
	if(!existingStatus.isMultiStatus() && existingStatus.isOK()) {
	return newStatus;
	}
	IStatus [] children = new IStatus [] {existingStatus, newStatus};
	multiStatus = new MultiStatus(J2EEUIPlugin.PLUGIN_ID, newSeverity, children, null, null);
	}
	return multiStatus;
	}

	public void componentResourceModified(ComponentResourceProxy originalResource, ComponentResourceProxy modifiedResource) {
	if (shouldDisplaySection()){
	// We are interested only in two cases:
	// 1. When the deploy path changes from / to any other thing...
	if (originalResource.runtimePath.isRoot() && !modifiedResource.runtimePath.isRoot()){
	resourceMappingsList.remove(originalResource.source.toString());
	if (originalResource.source.toString().equals(currentSelectedDDFolder)){
	currentSelectedDDFolder = null;
	}
	updateSourceMappingsCombo(currentSelectedDDFolder, resourceMappingsList);
	page.refresh();
	}
	// 2. When the deploy path changes from any thing to /
	else if (!originalResource.runtimePath.isRoot() && modifiedResource.runtimePath.isRoot()){
	resourceMappingsList.add(originalResource.source.toString());
	updateSourceMappingsCombo(currentSelectedDDFolder, resourceMappingsList);
	page.refresh();
	}
	}
	}
	}