plugins/org.eclipse.bpel.ui/src/org/eclipse/bpel/ui/extensions/BPELUIRegistry.java - bpel/org.eclipse.bpel - Git at Google

 /*******************************************************************************
  * Copyright (c) 2005, 2012 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.bpel.ui.extensions;

 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;

 import org.eclipse.bpel.ui.BPELUIPlugin;
 import org.eclipse.bpel.ui.IBPELUIConstants;
 import org.eclipse.bpel.ui.IHoverHelper;
 import org.eclipse.bpel.ui.Messages;
 import org.eclipse.bpel.ui.bpelactions.AbstractBPELAction;
 import org.eclipse.bpel.ui.expressions.DefaultExpressionEditor;
 import org.eclipse.bpel.ui.expressions.IExpressionEditor;
 import org.eclipse.bpel.ui.factories.AbstractUIObjectFactory;
 import org.eclipse.bpel.ui.util.BPELUtil;
 import org.eclipse.core.runtime.CoreException;
 import org.eclipse.core.runtime.IConfigurationElement;
 import org.eclipse.core.runtime.IExtensionPoint;
 import org.eclipse.core.runtime.IStatus;
 import org.eclipse.core.runtime.Platform;
 import org.eclipse.core.runtime.Status;
 import org.eclipse.emf.common.notify.AdapterFactory;
 import org.eclipse.emf.ecore.EClass;


 /**
  * Responsible for getting information from the BPEL UI extension points.
  */
 public class BPELUIRegistry {

 	static final String EXTPT_HOVERHELPERS = "hoverHelpers"; //$NON-NLS-1$
 	static final String ELEMENT_HOVERHELPER = "hoverHelper"; //$NON-NLS-1$
 	static final String EXTPT_EXPRESSION_EDITORS = "expressionEditors"; //$NON-NLS-1$
 	static final String ELEMENT_EDITOR = "editor"; //$NON-NLS-1$
 	static final String ATT_EXPRESSION_LANGUAGE = "expressionLanguage"; //$NON-NLS-1$
 	static final String ATT_CLASS = "class"; //$NON-NLS-1$
 	static final String ATT_LABEL = "label"; //$NON-NLS-1$
 	static final String EXTPT_ACTIONS = "actions"; //$NON-NLS-1$
 	static final String ELEMENT_CATEGORY = "category"; //$NON-NLS-1$
 	static final String ATT_NAME = "name"; //$NON-NLS-1$
 	static final String ATT_ID = "id"; //$NON-NLS-1$
 	static final String ELEMENT_ACTION = "action"; //$NON-NLS-1$
 	static final String ATT_CATEGORY_ID = "categoryId"; //$NON-NLS-1$
 	static final String EXTPT_MODELLISTENER = "modelListener"; //$NON-NLS-1$
 	static final String ELEMENT_LISTENER = "listener"; //$NON-NLS-1$
 	static final String ATT_SPEC_COMPLIANT = "specCompliant"; //$NON-NLS-1$

 	static final ExpressionEditorDescriptor[] EMPTY_EDITOR_DESCRIPTORS = {};

 	private static BPELUIRegistry instance;

 	private Map<String,ExpressionEditorDescriptor> fLanguageToEditorDescriptor;
 	private HoverHelperDescriptor hoverHelperDescriptor;
 	private ActionCategoryDescriptor[] fActionCategoryDescriptors;
 	private ActionDescriptor[] fActionDescriptors;
 	private ListenerDescriptor[] fListenerDescriptors;
 	private UIObjectFactoryDescriptor[] uiObjectFactoryDescriptor;
 	private IHoverHelper hoverHelper;

 	private BPELUIRegistry() {
 		readExpressionLanguageEditors();
 		readHoverHelpers();
 		readActions();
 		readListeners();
 		readUIObjecFactories();
 	}

 	/**
 	 * @return the singleton instance of this regitry.
 	 */

 	public static BPELUIRegistry getInstance() {
 		if (instance == null) {
 			instance = new BPELUIRegistry();
 		}
 		return instance;
 	}


 	/**
 	 * Return the hover helper.
 	 * @return the hover helper extension.
 	 * @throws CoreException
 	 */
 	public IHoverHelper getHoverHelper() throws CoreException {

 		if (hoverHelperDescriptor == null) {
 			return null;
 		}
 		if (hoverHelper == null) {
 			hoverHelper = hoverHelperDescriptor.createHoverHelper();
 		}
 		return hoverHelper;
 	}

 	/**
 	 * Returns an expression editor for the given expression language.
 	 * @param expressionLanguage
 	 * @return the IExpression editor for the given expression language.
 	 * @throws CoreException
 	 */
 	public IExpressionEditor getExpressionEditor (String expressionLanguage) throws CoreException {
 		ExpressionEditorDescriptor descriptor = fLanguageToEditorDescriptor.get(expressionLanguage);
 		if (descriptor == null) {
 			return new DefaultExpressionEditor();
 		}
 		IExpressionEditor editor = descriptor.createEditor();
 		return editor;
 	}

 	/**
 	 * Returns an expression editor descriptor for the given expression language.
 	 *
 	 * @param expressionLanguage
 	 * @return the expression language descriptor for the given expression language.
 	 */
 	public ExpressionEditorDescriptor getExpressionEditorDescriptor(String expressionLanguage) {
 		return fLanguageToEditorDescriptor.get(expressionLanguage);
 	}

 	private void readExpressionLanguageEditors() {
 		fLanguageToEditorDescriptor = new HashMap<String,ExpressionEditorDescriptor>();

 		for(IConfigurationElement editor : getConfigurationElements(EXTPT_EXPRESSION_EDITORS) ) {

 			if (editor.getName().equals(ELEMENT_EDITOR)) {
 				String language = editor.getAttribute(ATT_EXPRESSION_LANGUAGE);
 				String clazz = editor.getAttribute(ATT_CLASS);
 				if (language == null || clazz == null) {
 					String pluginId = BPELUIPlugin.INSTANCE.getBundle().getSymbolicName();
 					IStatus status = new Status(IStatus.ERROR, pluginId, IBPELUIConstants.MISSING_ATTRIBUTE, Messages.BPELUIRegistry_Expression_language_editors_must_provide_expressionLanguage_and_class__8, null);
 					BPELUIPlugin.INSTANCE.getLog().log(status);
 				} else {
 					ExpressionEditorDescriptor descriptor = new ExpressionEditorDescriptor();
 					descriptor.setExpressionLanguage(language);
 					descriptor.setElement(editor);
 					String label = editor.getAttribute(ATT_LABEL);
 					descriptor.setLabel(label);
 					fLanguageToEditorDescriptor.put(language, descriptor);
 				}
 			}
 		}
 	}

     /**
      * Return the UIObjectFactory descriptors
      */
 	public UIObjectFactoryDescriptor[] getUIObjectFactoryDescriptors() {
         return uiObjectFactoryDescriptor;
     }

 	/**
 	 * Return all action descriptors.
 	 * @return Return all action descriptors.
 	 */
 	public ActionDescriptor[] getActionDescriptors() {
 	    return fActionDescriptors;
 	}

 	/**
 	 * Returns the ActionDescriptor for the given EClass.
 	 * @param target the target
 	 * @return Returns the ActionDescriptor for the given EClass.
 	 */
 	public ActionDescriptor getActionDescriptor(EClass target) {
 		for(ActionDescriptor descriptor : fActionDescriptors ) {
 			if (descriptor.getAction().getModelType() == target) {
 				return descriptor;
 			}
 		}
 	    return null;
 	}

 	/**
 	 * @return the action category descriptors.
 	 */
 	public ActionCategoryDescriptor[] getActionCategoryDescriptors() {
 	    return fActionCategoryDescriptors;
 	}

 	/**
 	 * @return the listener descriptors.
 	 */
 	public ListenerDescriptor[] getListenerDescriptors() {
 	    return fListenerDescriptors;
 	}

 	private void readHoverHelpers() {

 		for (IConfigurationElement helper : getConfigurationElements(EXTPT_HOVERHELPERS) ) {
 			if (helper.getName().equals(ELEMENT_HOVERHELPER) == false) {
 				continue;
 			}

 			String clazz = helper.getAttribute(ATT_CLASS);
 			if (clazz == null) {
 				continue;
 			}

 			HoverHelperDescriptor descriptor = new HoverHelperDescriptor();
 			descriptor.setElement(helper);
 			this.hoverHelperDescriptor = descriptor;
 		}
 	}

 	/**
 	 * Read all the actions and categories.
 	 */
 	private void readActions() {
 	    List<ActionCategoryDescriptor> categories = new ArrayList<ActionCategoryDescriptor>();
 	    List<ActionDescriptor> actions = new ArrayList<ActionDescriptor>();

 		for (IConfigurationElement element : getConfigurationElements(EXTPT_ACTIONS)) {

 			if (element.getName().equals(ELEMENT_CATEGORY)) {
 				String name = element.getAttribute(ATT_NAME);
 				String id = element.getAttribute(ATT_ID);
 				if (name != null && id != null) {
 					ActionCategoryDescriptor descriptor = new ActionCategoryDescriptor();
 					descriptor.setName(name);
 					descriptor.setId(id);
 					categories.add(descriptor);
 				}
 			} else if (element.getName().equals(ELEMENT_ACTION)) {
 				String id = element.getAttribute(ATT_ID);
 				String category = element.getAttribute(ATT_CATEGORY_ID);
 				String specCompliant = element.getAttribute(ATT_SPEC_COMPLIANT);
 				if (category != null && id != null) {
 					ActionDescriptor descriptor = new ActionDescriptor();
 					descriptor.setId(id);
 					descriptor.setCategoryId(category);
 					descriptor.setSpecCompliant(Boolean.valueOf(specCompliant).booleanValue());
 					try {
 					    AbstractBPELAction action = (AbstractBPELAction)element.createExecutableExtension(ATT_CLASS);
 						descriptor.setAction(action);
 					} catch (CoreException e) {
 						BPELUIPlugin.log(e);
 					}
 					actions.add(descriptor);

 					// register AdapterFactory - since it has to be done only once we do it here
 					AdapterFactory factory = descriptor.getAction().getAdapterFactory();
 					if (factory != null) {
 					    BPELUtil.registerAdapterFactory(descriptor.getAction().getModelType(), factory);
 					}
 				}
 			}
 		}

 		fActionCategoryDescriptors = new ActionCategoryDescriptor[categories.size()];
 		categories.toArray(fActionCategoryDescriptors);
 		fActionDescriptors = new ActionDescriptor[actions.size()];
 		actions.toArray(fActionDescriptors);
 	}

     /**
      * Read all the actions and categories.
      */
     private void readUIObjecFactories() {

     	List factories = new ArrayList();
         IConfigurationElement[] extensions = getConfigurationElements("uiObjectFactories");
         for (int i = 0; i < extensions.length; i++) {
             IConfigurationElement element = extensions[i];
             if (element.getName().equals("factory")) {
                 String id = element.getAttribute(ATT_ID);
                 String category = element.getAttribute(ATT_CATEGORY_ID);
                 String specCompliant = element.getAttribute(ATT_SPEC_COMPLIANT);
                 if (category != null && id != null) {
                     UIObjectFactoryDescriptor descriptor = new UIObjectFactoryDescriptor();
                     descriptor.setId(id);
                     descriptor.setCategoryId(category);
                     descriptor.setSpecCompliant(Boolean.valueOf(specCompliant).booleanValue());
                     try {
                         AbstractUIObjectFactory factory = (AbstractUIObjectFactory) element.createExecutableExtension(ATT_CLASS);
                         descriptor.setFactory(factory);
                         descriptor.setConfigElement(element);
                     } catch (CoreException e) {
                         BPELUIPlugin.log(e);
                     }
                     factories.add(descriptor);
                 }
             }
         }

         uiObjectFactoryDescriptor = new UIObjectFactoryDescriptor[factories.size()];
         factories.toArray(uiObjectFactoryDescriptor);
     }

 	/**
 	 * Read all the model listeners
 	 */
 	private void readListeners() {
 	    List<ListenerDescriptor> listeners = new ArrayList<ListenerDescriptor>();

 	    for (IConfigurationElement element : getConfigurationElements(EXTPT_MODELLISTENER)) {
 			if (element.getName().equals(ELEMENT_LISTENER)) {
 				String id = element.getAttribute(ATT_ID);
 				if (id != null) {
 					ListenerDescriptor descriptor = new ListenerDescriptor();
 					descriptor.setId(id);
 					try {
 					    IModelListener listener = (IModelListener)element.createExecutableExtension(ATT_CLASS);
 						descriptor.setModelListener(listener);
 					} catch (CoreException e) {
 						BPELUIPlugin.log(e);
 					}
 					listeners.add(descriptor);
 				}
 			}
 		}

 		fListenerDescriptors = new ListenerDescriptor[listeners.size()];
 		listeners.toArray(fListenerDescriptors);
 	}

 	/**
 	 * Given an extension point name returns its configuration elements.
 	 */
 	private IConfigurationElement[] getConfigurationElements(String extensionPointId) {
 		IExtensionPoint extensionPoint = Platform.getExtensionRegistry().getExtensionPoint(
 			BPELUIPlugin.PLUGIN_ID, extensionPointId);
 		if (extensionPoint == null) {
 			return null;
 		}
 		return extensionPoint.getConfigurationElements();
 	}

 	/**
 	 * @return an array of ExpressionEditorDescriptor values.
 	 */
 	public ExpressionEditorDescriptor[] getExpressionEditorDescriptors() {
 		return fLanguageToEditorDescriptor.values().toArray( EMPTY_EDITOR_DESCRIPTORS );
 	}
 }
	/*******************************************************************************
	* Copyright (c) 2005, 2012 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.bpel.ui.extensions;

	import java.util.ArrayList;
	import java.util.HashMap;
	import java.util.List;
	import java.util.Map;

	import org.eclipse.bpel.ui.BPELUIPlugin;
	import org.eclipse.bpel.ui.IBPELUIConstants;
	import org.eclipse.bpel.ui.IHoverHelper;
	import org.eclipse.bpel.ui.Messages;
	import org.eclipse.bpel.ui.bpelactions.AbstractBPELAction;
	import org.eclipse.bpel.ui.expressions.DefaultExpressionEditor;
	import org.eclipse.bpel.ui.expressions.IExpressionEditor;
	import org.eclipse.bpel.ui.factories.AbstractUIObjectFactory;
	import org.eclipse.bpel.ui.util.BPELUtil;
	import org.eclipse.core.runtime.CoreException;
	import org.eclipse.core.runtime.IConfigurationElement;
	import org.eclipse.core.runtime.IExtensionPoint;
	import org.eclipse.core.runtime.IStatus;
	import org.eclipse.core.runtime.Platform;
	import org.eclipse.core.runtime.Status;
	import org.eclipse.emf.common.notify.AdapterFactory;
	import org.eclipse.emf.ecore.EClass;


	/**
	* Responsible for getting information from the BPEL UI extension points.
	*/
	public class BPELUIRegistry {

	static final String EXTPT_HOVERHELPERS = "hoverHelpers"; //$NON-NLS-1$
	static final String ELEMENT_HOVERHELPER = "hoverHelper"; //$NON-NLS-1$
	static final String EXTPT_EXPRESSION_EDITORS = "expressionEditors"; //$NON-NLS-1$
	static final String ELEMENT_EDITOR = "editor"; //$NON-NLS-1$
	static final String ATT_EXPRESSION_LANGUAGE = "expressionLanguage"; //$NON-NLS-1$
	static final String ATT_CLASS = "class"; //$NON-NLS-1$
	static final String ATT_LABEL = "label"; //$NON-NLS-1$
	static final String EXTPT_ACTIONS = "actions"; //$NON-NLS-1$
	static final String ELEMENT_CATEGORY = "category"; //$NON-NLS-1$
	static final String ATT_NAME = "name"; //$NON-NLS-1$
	static final String ATT_ID = "id"; //$NON-NLS-1$
	static final String ELEMENT_ACTION = "action"; //$NON-NLS-1$
	static final String ATT_CATEGORY_ID = "categoryId"; //$NON-NLS-1$
	static final String EXTPT_MODELLISTENER = "modelListener"; //$NON-NLS-1$
	static final String ELEMENT_LISTENER = "listener"; //$NON-NLS-1$
	static final String ATT_SPEC_COMPLIANT = "specCompliant"; //$NON-NLS-1$

	static final ExpressionEditorDescriptor[] EMPTY_EDITOR_DESCRIPTORS = {};

	private static BPELUIRegistry instance;

	private Map<String,ExpressionEditorDescriptor> fLanguageToEditorDescriptor;
	private HoverHelperDescriptor hoverHelperDescriptor;
	private ActionCategoryDescriptor[] fActionCategoryDescriptors;
	private ActionDescriptor[] fActionDescriptors;
	private ListenerDescriptor[] fListenerDescriptors;
	private UIObjectFactoryDescriptor[] uiObjectFactoryDescriptor;
	private IHoverHelper hoverHelper;

	private BPELUIRegistry() {
	readExpressionLanguageEditors();
	readHoverHelpers();
	readActions();
	readListeners();
	readUIObjecFactories();
	}

	/**
	* @return the singleton instance of this regitry.
	*/

	public static BPELUIRegistry getInstance() {
	if (instance == null) {
	instance = new BPELUIRegistry();
	}
	return instance;
	}


	/**
	* Return the hover helper.
	* @return the hover helper extension.
	* @throws CoreException
	*/
	public IHoverHelper getHoverHelper() throws CoreException {

	if (hoverHelperDescriptor == null) {
	return null;
	}
	if (hoverHelper == null) {
	hoverHelper = hoverHelperDescriptor.createHoverHelper();
	}
	return hoverHelper;
	}

	/**
	* Returns an expression editor for the given expression language.
	* @param expressionLanguage
	* @return the IExpression editor for the given expression language.
	* @throws CoreException
	*/
	public IExpressionEditor getExpressionEditor (String expressionLanguage) throws CoreException {
	ExpressionEditorDescriptor descriptor = fLanguageToEditorDescriptor.get(expressionLanguage);
	if (descriptor == null) {
	return new DefaultExpressionEditor();
	}
	IExpressionEditor editor = descriptor.createEditor();
	return editor;
	}

	/**
	* Returns an expression editor descriptor for the given expression language.
	*
	* @param expressionLanguage
	* @return the expression language descriptor for the given expression language.
	*/
	public ExpressionEditorDescriptor getExpressionEditorDescriptor(String expressionLanguage) {
	return fLanguageToEditorDescriptor.get(expressionLanguage);
	}

	private void readExpressionLanguageEditors() {
	fLanguageToEditorDescriptor = new HashMap<String,ExpressionEditorDescriptor>();

	for(IConfigurationElement editor : getConfigurationElements(EXTPT_EXPRESSION_EDITORS) ) {

	if (editor.getName().equals(ELEMENT_EDITOR)) {
	String language = editor.getAttribute(ATT_EXPRESSION_LANGUAGE);
	String clazz = editor.getAttribute(ATT_CLASS);
	if (language == null \|\| clazz == null) {
	String pluginId = BPELUIPlugin.INSTANCE.getBundle().getSymbolicName();
	IStatus status = new Status(IStatus.ERROR, pluginId, IBPELUIConstants.MISSING_ATTRIBUTE, Messages.BPELUIRegistry_Expression_language_editors_must_provide_expressionLanguage_and_class__8, null);
	BPELUIPlugin.INSTANCE.getLog().log(status);
	} else {
	ExpressionEditorDescriptor descriptor = new ExpressionEditorDescriptor();
	descriptor.setExpressionLanguage(language);
	descriptor.setElement(editor);
	String label = editor.getAttribute(ATT_LABEL);
	descriptor.setLabel(label);
	fLanguageToEditorDescriptor.put(language, descriptor);
	}
	}
	}
	}

	/**
	* Return the UIObjectFactory descriptors
	*/
	public UIObjectFactoryDescriptor[] getUIObjectFactoryDescriptors() {
	return uiObjectFactoryDescriptor;
	}

	/**
	* Return all action descriptors.
	* @return Return all action descriptors.
	*/
	public ActionDescriptor[] getActionDescriptors() {
	return fActionDescriptors;
	}

	/**
	* Returns the ActionDescriptor for the given EClass.
	* @param target the target
	* @return Returns the ActionDescriptor for the given EClass.
	*/
	public ActionDescriptor getActionDescriptor(EClass target) {
	for(ActionDescriptor descriptor : fActionDescriptors ) {
	if (descriptor.getAction().getModelType() == target) {
	return descriptor;
	}
	}
	return null;
	}

	/**
	* @return the action category descriptors.
	*/
	public ActionCategoryDescriptor[] getActionCategoryDescriptors() {
	return fActionCategoryDescriptors;
	}

	/**
	* @return the listener descriptors.
	*/
	public ListenerDescriptor[] getListenerDescriptors() {
	return fListenerDescriptors;
	}

	private void readHoverHelpers() {

	for (IConfigurationElement helper : getConfigurationElements(EXTPT_HOVERHELPERS) ) {
	if (helper.getName().equals(ELEMENT_HOVERHELPER) == false) {
	continue;
	}

	String clazz = helper.getAttribute(ATT_CLASS);
	if (clazz == null) {
	continue;
	}

	HoverHelperDescriptor descriptor = new HoverHelperDescriptor();
	descriptor.setElement(helper);
	this.hoverHelperDescriptor = descriptor;
	}
	}

	/**
	* Read all the actions and categories.
	*/
	private void readActions() {
	List<ActionCategoryDescriptor> categories = new ArrayList<ActionCategoryDescriptor>();
	List<ActionDescriptor> actions = new ArrayList<ActionDescriptor>();

	for (IConfigurationElement element : getConfigurationElements(EXTPT_ACTIONS)) {

	if (element.getName().equals(ELEMENT_CATEGORY)) {
	String name = element.getAttribute(ATT_NAME);
	String id = element.getAttribute(ATT_ID);
	if (name != null && id != null) {
	ActionCategoryDescriptor descriptor = new ActionCategoryDescriptor();
	descriptor.setName(name);
	descriptor.setId(id);
	categories.add(descriptor);
	}
	} else if (element.getName().equals(ELEMENT_ACTION)) {
	String id = element.getAttribute(ATT_ID);
	String category = element.getAttribute(ATT_CATEGORY_ID);
	String specCompliant = element.getAttribute(ATT_SPEC_COMPLIANT);
	if (category != null && id != null) {
	ActionDescriptor descriptor = new ActionDescriptor();
	descriptor.setId(id);
	descriptor.setCategoryId(category);
	descriptor.setSpecCompliant(Boolean.valueOf(specCompliant).booleanValue());
	try {
	AbstractBPELAction action = (AbstractBPELAction)element.createExecutableExtension(ATT_CLASS);
	descriptor.setAction(action);
	} catch (CoreException e) {
	BPELUIPlugin.log(e);
	}
	actions.add(descriptor);

	// register AdapterFactory - since it has to be done only once we do it here
	AdapterFactory factory = descriptor.getAction().getAdapterFactory();
	if (factory != null) {
	BPELUtil.registerAdapterFactory(descriptor.getAction().getModelType(), factory);
	}
	}
	}
	}

	fActionCategoryDescriptors = new ActionCategoryDescriptor[categories.size()];
	categories.toArray(fActionCategoryDescriptors);
	fActionDescriptors = new ActionDescriptor[actions.size()];
	actions.toArray(fActionDescriptors);
	}

	/**
	* Read all the actions and categories.
	*/
	private void readUIObjecFactories() {

	List factories = new ArrayList();
	IConfigurationElement[] extensions = getConfigurationElements("uiObjectFactories");
	for (int i = 0; i < extensions.length; i++) {
	IConfigurationElement element = extensions[i];
	if (element.getName().equals("factory")) {
	String id = element.getAttribute(ATT_ID);
	String category = element.getAttribute(ATT_CATEGORY_ID);
	String specCompliant = element.getAttribute(ATT_SPEC_COMPLIANT);
	if (category != null && id != null) {
	UIObjectFactoryDescriptor descriptor = new UIObjectFactoryDescriptor();
	descriptor.setId(id);
	descriptor.setCategoryId(category);
	descriptor.setSpecCompliant(Boolean.valueOf(specCompliant).booleanValue());
	try {
	AbstractUIObjectFactory factory = (AbstractUIObjectFactory) element.createExecutableExtension(ATT_CLASS);
	descriptor.setFactory(factory);
	descriptor.setConfigElement(element);
	} catch (CoreException e) {
	BPELUIPlugin.log(e);
	}
	factories.add(descriptor);
	}
	}
	}

	uiObjectFactoryDescriptor = new UIObjectFactoryDescriptor[factories.size()];
	factories.toArray(uiObjectFactoryDescriptor);
	}

	/**
	* Read all the model listeners
	*/
	private void readListeners() {
	List<ListenerDescriptor> listeners = new ArrayList<ListenerDescriptor>();

	for (IConfigurationElement element : getConfigurationElements(EXTPT_MODELLISTENER)) {
	if (element.getName().equals(ELEMENT_LISTENER)) {
	String id = element.getAttribute(ATT_ID);
	if (id != null) {
	ListenerDescriptor descriptor = new ListenerDescriptor();
	descriptor.setId(id);
	try {
	IModelListener listener = (IModelListener)element.createExecutableExtension(ATT_CLASS);
	descriptor.setModelListener(listener);
	} catch (CoreException e) {
	BPELUIPlugin.log(e);
	}
	listeners.add(descriptor);
	}
	}
	}

	fListenerDescriptors = new ListenerDescriptor[listeners.size()];
	listeners.toArray(fListenerDescriptors);
	}

	/**
	* Given an extension point name returns its configuration elements.
	*/
	private IConfigurationElement[] getConfigurationElements(String extensionPointId) {
	IExtensionPoint extensionPoint = Platform.getExtensionRegistry().getExtensionPoint(
	BPELUIPlugin.PLUGIN_ID, extensionPointId);
	if (extensionPoint == null) {
	return null;
	}
	return extensionPoint.getConfigurationElements();
	}

	/**
	* @return an array of ExpressionEditorDescriptor values.
	*/
	public ExpressionEditorDescriptor[] getExpressionEditorDescriptors() {
	return fLanguageToEditorDescriptor.values().toArray( EMPTY_EDITOR_DESCRIPTORS );
	}
	}