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

 /*******************************************************************************
  * Copyright (c) 2003, 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.jst.j2ee.internal.ejb.provider;

 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.HashMap;
 import java.util.Hashtable;
 import java.util.List;
 import java.util.Map;

 import org.eclipse.emf.common.notify.AdapterFactory;
 import org.eclipse.emf.common.notify.Notification;
 import org.eclipse.emf.common.notify.NotificationWrapper;
 import org.eclipse.emf.common.notify.impl.NotificationImpl;
 import org.eclipse.jst.j2ee.ejb.EJBJar;
 import org.eclipse.jst.j2ee.ejb.EjbPackage;
 import org.eclipse.jst.j2ee.ejb.EnterpriseBean;
 import org.eclipse.jst.j2ee.ejb.Entity;
 import org.eclipse.jst.j2ee.ejb.MessageDriven;
 import org.eclipse.jst.j2ee.ejb.Session;
 import org.eclipse.jst.j2ee.internal.J2EEVersionConstants;
 import org.eclipse.jst.j2ee.internal.plugin.J2EEPlugin;
 import org.eclipse.jst.j2ee.internal.provider.J2EEItemProvider;


 /**
  * @author Sachin P Patel
  *
  * To change this generated comment edit the template variable "typecomment":
  * Window>Preferences>Java>Templates. To enable and disable the creation of type comments go to
  * Window>Preferences>Java>Code Generation.
  */
 public class GroupedEJBJarItemProvider extends EJBJarItemProvider {

 	private GroupedSessionItemProvider sessionProvider = null;
 	private GroupedEntityItemProvider entityProvider = null;
 	private GroupedMessageItemProvider messageProvider = null;

 	private static Hashtable sessionTable = new Hashtable();
 	private static Hashtable entityTable = new Hashtable();
 	private static Hashtable messageTable = new Hashtable();

 	private static final String SESSION = EJBUIMessages.GroupedEJBJarItemProvider_UI_0;
 	private static final String ENTITY = EJBUIMessages.GroupedEJBJarItemProvider_UI_1;
 	private static final String MESSAGE = EJBUIMessages.GroupedEJBJarItemProvider_UI_2;

 	//	Normally there is one instance of an item provider for all instances of the objecct
 	//	in the tree. The item provider would be stateless. However, because we are doing tricks
 	//	here, we are keeping track of all items this provider manages. The key in the map is the
 	//	object (EJBJar), and the value is the children nodes that we inserted

 	protected Map children = new HashMap();
 	private boolean showAssemblyDescriptor;
 	private boolean isDisposing;

 	public GroupedEJBJarItemProvider(AdapterFactory adapterFactory, boolean showAssemblyDescriptor) {
 		super(adapterFactory);
 		this.showAssemblyDescriptor = showAssemblyDescriptor;
 	}

 	public Collection getChildren(Object object) {
 		List result = initChildren(object);
 		if (showAssemblyDescriptor) {
 			if (((EJBJar) object).getAssemblyDescriptor() != null)
 				result.add(((EJBJar) object).getAssemblyDescriptor());
 		}
 		return result;
 	}

 	protected List initChildren(Object object) {
 		EJBJar ejbJar = (EJBJar) object;
 		List allRootBeans = getAllRootBeans(ejbJar);

 		boolean is20Jar = is20Jar(ejbJar);

 		List localChildren = new ArrayList(5);

 		List entityBeans = new ArrayList();
 		List sessionBeans = new ArrayList();
 		List messageBeans = new ArrayList();

 		catagorizeBeans(allRootBeans, entityBeans, sessionBeans, messageBeans);
 		orderBeans(entityBeans);
 		orderBeans(sessionBeans);
 		orderBeans(messageBeans);

 		//ENABLE FOR: NOT TO SHOW EMPTY GROUPS
 		//if (sessionBeans.size() > 0) {
 		if (sessionTable.get(ejbJar) == null) {
 			//create new item provider instance
 			sessionProvider = new GroupedSessionItemProvider(adapterFactory, null, getImage(SESSION), object, sessionBeans);
 			sessionTable.put(ejbJar, sessionProvider);
 			localChildren.add(sessionProvider);
 		} else {
 			//use existing instance from table
 			localChildren.add(sessionTable.get(ejbJar));
 		}
 		//}

 		//ENABLE FOR: NOT TO SHOW EMPTY GROUPS
 		//if (entityBeans.size() > 0) {
 		if (entityTable.get(ejbJar) == null) {
 			//create new item provider instance
 			entityProvider = new GroupedEntityItemProvider(adapterFactory, null, getImage(ENTITY), object, entityBeans);
 			entityTable.put(ejbJar, entityProvider);
 			localChildren.add(entityProvider);
 		} else {
 			//use existing instance from table
 			localChildren.add(entityTable.get(ejbJar));
 		}
 		//}

 		//ENABLE FOR: NOT TO SHOW EMPTY GROUPS
 		//if (is20Jar && messageBeans.size() > 0) {
 		if (is20Jar) {
 			if (messageTable.get(ejbJar) == null) {
 				//create new item provider instance
 				messageProvider = new GroupedMessageItemProvider(adapterFactory, null, getImage(MESSAGE), object, messageBeans);
 				messageTable.put(ejbJar, messageProvider);
 				localChildren.add(messageProvider);
 			} else {
 				//use existing instance from table
 				localChildren.add(messageTable.get(ejbJar));
 			}
 		}
 		//}

 		children.put(object, localChildren);

 		return localChildren;
 	}

 	protected void orderBeans(List beans) {
 		Object[] beansArray = beans.toArray();
 		Arrays.sort(beansArray, EJBNameComparator.singleton());
 		beans.clear();
 		beans.addAll(Arrays.asList(beansArray));
 	}

 	protected static List getAllRootBeans(EJBJar ejbJar) {
 		return ejbJar.getEnterpriseBeans();
 	}

 	protected void catagorizeBeans(List allRootBeans, List entityBeans, List sessionBeans, List messageBeans) {
 		for (int i = 0; i < allRootBeans.size(); i++) {
 			if (((EnterpriseBean) allRootBeans.get(i)).isSession()) {
 				sessionBeans.add(allRootBeans.get(i));
 			} else if (((EnterpriseBean) allRootBeans.get(i)).isEntity()) {
 				entityBeans.add(allRootBeans.get(i));
 			} else if (((EnterpriseBean) allRootBeans.get(i)).isMessageDriven()) {
 				messageBeans.add(allRootBeans.get(i));
 			}
 		}
 	}

 	static protected GroupedSessionItemProvider getSessionNode(Object object) {
 		return (GroupedSessionItemProvider) sessionTable.get(object);
 	}

 	static protected GroupedEntityItemProvider getEntityNode(Object object) {
 		return (GroupedEntityItemProvider) entityTable.get(object);
 	}

 	static protected GroupedMessageItemProvider getMessageNode(Object object) {
 		return (GroupedMessageItemProvider) messageTable.get(object);
 	}

 	public Object getImage(String type) {
 		if (type.equals(SESSION))
 			return J2EEPlugin.getPlugin().getImage("sessionBean_obj"); //$NON-NLS-1$
 		else if (type.equals(MESSAGE))
 			return J2EEPlugin.getPlugin().getImage("message_bean_obj"); //$NON-NLS-1$
 		else if (type.equals(ENTITY))
 			return J2EEPlugin.getPlugin().getImage("entitybean_obj"); //$NON-NLS-1$
 		else
 			return null;
 	}

 	private boolean is20Jar(EJBJar ejbJar) {
 		switch (ejbJar.getVersionID()) {
 			case J2EEVersionConstants.EJB_1_0_ID :
 			case J2EEVersionConstants.EJB_1_1_ID :
 				return false;
 			case J2EEVersionConstants.EJB_2_0_ID :
 			case J2EEVersionConstants.EJB_2_1_ID :
 			default :
 				return true;
 		}
 	}

 	public void notifyChanged(Notification notification) {
 		if (notification.getEventType() == Notification.REMOVING_ADAPTER && notification.getOldValue() == this && !isDisposing) {
 			removeTarget(notification);
 			return;
 		}
 		if (notification.getFeature() == EjbPackage.eINSTANCE.getEJBJar_EnterpriseBeans()) {
 			J2EEItemProvider provider = beansChanged((EJBJar) notification.getNotifier(), notification.getEventType(), notification.getOldValue(), notification.getNewValue(), notification.getPosition());

 			//EJB's group has not been added yet, need to add group to tree before EJB can be added
 			if (provider == null) {
 				Notification msg = new NotificationImpl(Notification.ADD, null, getEJBItemProvider((EnterpriseBean) notification.getNewValue()), 1);
 				NotificationWrapper notificationWrapper = new NotificationWrapper(notification.getNotifier(), msg);
 				fireNotifyChanged(notificationWrapper);
 				provider = beansChanged((EJBJar) notification.getNotifier(), notification.getEventType(), notification.getOldValue(), notification.getNewValue(), notification.getPosition());
 			}

 			//Fire notification for EJB add or remove
 			NotificationWrapper notificationWrapper = new NotificationWrapper(provider, notification);
 			fireNotifyChanged(notificationWrapper);

 			//ENABLE FOR: NOT TO SHOW EMPTY GROUPS
 			//If Group is empty remove the group
 			/*
 			 * if (provider != null && provider.getChildren().size() == 0) { Notification msg = new
 			 * NotificationImpl(Notification.REMOVE, provider, null, 1); notificationWrapper = new
 			 * NotificationWrapper(notification.getNotifier(), msg);
 			 * fireNotifyChanged(notificationWrapper);
 			 *
 			 * //Group is removed so flush out table entry if (provider instanceof
 			 * GroupedSessionItemProvider) { sessionTable.remove(notification.getNotifier());
 			 * provider = null; } else if (provider instanceof GroupedEntityItemProvider) {
 			 * entityTable.remove(notification.getNotifier()); provider = null; } else if (provider
 			 * instanceof GroupedMessageItemProvider) {
 			 * messageTable.remove(notification.getNotifier()); provider = null; }
 			 *
 			 * //If all groups are removed remove the extended children List allChildren = new
 			 * ArrayList(this.getChildren((EJBJar) notification.getNotifier()));
 			 * if(sessionTable.get(notification.getNotifier()) == null &&
 			 * entityTable.get(notification.getNotifier()) == null &&
 			 * messageTable.get(notification.getNotifier()) == null) { for(int i = 0; i <
 			 * allChildren.size(); i++) { Notification message = new
 			 * NotificationImpl(Notification.REMOVE, allChildren.get(i), null, 1);
 			 * notificationWrapper = new NotificationWrapper(notification.getNotifier(), message);
 			 * fireNotifyChanged(notificationWrapper); } this.getChildren((EJBJar)
 			 * notification.getNotifier()).clear(); } }
 			 */
 		} else {
 			super.notifyChanged(notification);
 		}
 	}

 	protected J2EEItemProvider beansChanged(EJBJar ejbJar, int eventType, Object oldValue, Object newValue, int pos) {
 		J2EEItemProvider provider = getItemProvider(ejbJar, oldValue, newValue);

 		if (provider != null) {
 			Collection grandChildren = provider.getChildren();

 			switch (eventType) {
 				case Notification.ADD : {
 					if (!grandChildren.contains(newValue))
 						grandChildren.add(newValue);

 					break;
 				}
 				case Notification.ADD_MANY : {
 					grandChildren.addAll((Collection) newValue);
 					break;
 				}
 				case Notification.REMOVE : {
 					grandChildren.remove(oldValue);
 					break;
 				}
 				case Notification.REMOVE_MANY : {
 					grandChildren.removeAll((Collection) oldValue);
 					break;
 				}
 			}
 		} else {
 			//GroupedProvider for new bean does not exist, create one.
 			List allRootBeans = getAllRootBeans(ejbJar);

 			List entityBeans = new ArrayList();
 			List sessionBeans = new ArrayList();
 			List messageBeans = new ArrayList();

 			catagorizeBeans(allRootBeans, entityBeans, sessionBeans, messageBeans);

 			if (newValue instanceof Session) {
 				sessionProvider = new GroupedSessionItemProvider(adapterFactory, null, getImage(SESSION), ejbJar, sessionBeans);
 				sessionTable.put(ejbJar, sessionProvider);
 			} else if (newValue instanceof Entity) {
 				entityProvider = new GroupedEntityItemProvider(adapterFactory, null, getImage(ENTITY), ejbJar, entityBeans);
 				entityTable.put(ejbJar, entityProvider);
 			} else if (newValue instanceof MessageDriven) {
 				messageProvider = new GroupedMessageItemProvider(adapterFactory, null, getImage(MESSAGE), ejbJar, messageBeans);
 				messageTable.put(ejbJar, messageProvider);
 			}
 		}
 		return provider;
 	}

 	static public J2EEItemProvider getEJBJarItemProvider(EJBJar ejbJar, Object bean) {
 		J2EEItemProvider provider = null;
 		if (ejbJar != null && bean != null) {
 			if (bean instanceof Session) {
 				provider = getSessionNode(ejbJar);
 			} else if (bean instanceof Entity) {
 				provider = getEntityNode(ejbJar);
 			} else if (bean instanceof MessageDriven) {
 				provider = getMessageNode(ejbJar);
 			}
 		}
 		return provider;
 	}

 	static public J2EEItemProvider getEJBItemProvider(EnterpriseBean bean) {
 		if (bean != null) {
 			EJBJar ejbJar = bean.getEjbJar();
 			return getEJBJarItemProvider(ejbJar, bean);
 		}
 		return null;
 	}

 	protected J2EEItemProvider getItemProvider(EJBJar ejbJar, Object oldValue, Object newValue) {
 		if (newValue != null)
 			return getEJBJarItemProvider(ejbJar, newValue);
 		else if (oldValue != null)
 			return getEJBJarItemProvider(ejbJar, oldValue);
 		else
 			return null;
 	}

 	public static boolean isRootBean(EnterpriseBean bean) {
 		List allRootBeans = getAllRootBeans(bean.getEjbJar());
 		if (allRootBeans != null && allRootBeans.contains(bean)) {
 			return true;
 		}
 		return false;
 	}

 	//	Utility method for garbage collection - if EJBJar removed, remove
 	//	all entires in table for EJBJar
 	static public void flushOutTableEntriesForEJBJar(EJBJar ejbJar) {
 		sessionTable.remove(ejbJar);
 		entityTable.remove(ejbJar);
 		messageTable.remove(ejbJar);
 	}

 	public boolean hasChildren(Object parent) {
 		return true;
 	}

 	/*
 	 * (non-Javadoc)
 	 *
 	 * @see org.eclipse.jst.j2ee.internal.internal.ejb.provider.EJBJarItemProvider#removeTarget(org.eclipse.emf.common.notify.Notification)
 	 */
 	protected void removeTarget(Notification not) {
 		if (not.getNotifier() instanceof EJBJar)
 			flushOutTableEntriesForEJBJar((EJBJar) not.getNotifier());
 	}

 	/*
 	 * (non-Javadoc)
 	 *
 	 * @see org.eclipse.emf.edit.provider.ItemProviderAdapter#dispose()
 	 */
 	public void dispose() {
 		try {
 			isDisposing = true;
 			super.dispose();
 		} finally {
 			isDisposing = false;
 		}
 	}
 }
	/*******************************************************************************
	* Copyright (c) 2003, 2006 IBM Corporation and others.
	* All rights reserved. This program and the accompanying materials
	* are made available under the terms of the Eclipse Public License v1.0
	* which accompanies this distribution, and is available at
	* http://www.eclipse.org/legal/epl-v10.html
	*
	* Contributors:
	* IBM Corporation - initial API and implementation
	*******************************************************************************/
	package org.eclipse.jst.j2ee.internal.ejb.provider;

	import java.util.ArrayList;
	import java.util.Arrays;
	import java.util.Collection;
	import java.util.HashMap;
	import java.util.Hashtable;
	import java.util.List;
	import java.util.Map;

	import org.eclipse.emf.common.notify.AdapterFactory;
	import org.eclipse.emf.common.notify.Notification;
	import org.eclipse.emf.common.notify.NotificationWrapper;
	import org.eclipse.emf.common.notify.impl.NotificationImpl;
	import org.eclipse.jst.j2ee.ejb.EJBJar;
	import org.eclipse.jst.j2ee.ejb.EjbPackage;
	import org.eclipse.jst.j2ee.ejb.EnterpriseBean;
	import org.eclipse.jst.j2ee.ejb.Entity;
	import org.eclipse.jst.j2ee.ejb.MessageDriven;
	import org.eclipse.jst.j2ee.ejb.Session;
	import org.eclipse.jst.j2ee.internal.J2EEVersionConstants;
	import org.eclipse.jst.j2ee.internal.plugin.J2EEPlugin;
	import org.eclipse.jst.j2ee.internal.provider.J2EEItemProvider;


	/**
	* @author Sachin P Patel
	*
	* To change this generated comment edit the template variable "typecomment":
	* Window>Preferences>Java>Templates. To enable and disable the creation of type comments go to
	* Window>Preferences>Java>Code Generation.
	*/
	public class GroupedEJBJarItemProvider extends EJBJarItemProvider {

	private GroupedSessionItemProvider sessionProvider = null;
	private GroupedEntityItemProvider entityProvider = null;
	private GroupedMessageItemProvider messageProvider = null;

	private static Hashtable sessionTable = new Hashtable();
	private static Hashtable entityTable = new Hashtable();
	private static Hashtable messageTable = new Hashtable();

	private static final String SESSION = EJBUIMessages.GroupedEJBJarItemProvider_UI_0;
	private static final String ENTITY = EJBUIMessages.GroupedEJBJarItemProvider_UI_1;
	private static final String MESSAGE = EJBUIMessages.GroupedEJBJarItemProvider_UI_2;

	// Normally there is one instance of an item provider for all instances of the objecct
	// in the tree. The item provider would be stateless. However, because we are doing tricks
	// here, we are keeping track of all items this provider manages. The key in the map is the
	// object (EJBJar), and the value is the children nodes that we inserted

	protected Map children = new HashMap();
	private boolean showAssemblyDescriptor;
	private boolean isDisposing;

	public GroupedEJBJarItemProvider(AdapterFactory adapterFactory, boolean showAssemblyDescriptor) {
	super(adapterFactory);
	this.showAssemblyDescriptor = showAssemblyDescriptor;
	}

	public Collection getChildren(Object object) {
	List result = initChildren(object);
	if (showAssemblyDescriptor) {
	if (((EJBJar) object).getAssemblyDescriptor() != null)
	result.add(((EJBJar) object).getAssemblyDescriptor());
	}
	return result;
	}

	protected List initChildren(Object object) {
	EJBJar ejbJar = (EJBJar) object;
	List allRootBeans = getAllRootBeans(ejbJar);

	boolean is20Jar = is20Jar(ejbJar);

	List localChildren = new ArrayList(5);

	List entityBeans = new ArrayList();
	List sessionBeans = new ArrayList();
	List messageBeans = new ArrayList();

	catagorizeBeans(allRootBeans, entityBeans, sessionBeans, messageBeans);
	orderBeans(entityBeans);
	orderBeans(sessionBeans);
	orderBeans(messageBeans);

	//ENABLE FOR: NOT TO SHOW EMPTY GROUPS
	//if (sessionBeans.size() > 0) {
	if (sessionTable.get(ejbJar) == null) {
	//create new item provider instance
	sessionProvider = new GroupedSessionItemProvider(adapterFactory, null, getImage(SESSION), object, sessionBeans);
	sessionTable.put(ejbJar, sessionProvider);
	localChildren.add(sessionProvider);
	} else {
	//use existing instance from table
	localChildren.add(sessionTable.get(ejbJar));
	}
	//}

	//ENABLE FOR: NOT TO SHOW EMPTY GROUPS
	//if (entityBeans.size() > 0) {
	if (entityTable.get(ejbJar) == null) {
	//create new item provider instance
	entityProvider = new GroupedEntityItemProvider(adapterFactory, null, getImage(ENTITY), object, entityBeans);
	entityTable.put(ejbJar, entityProvider);
	localChildren.add(entityProvider);
	} else {
	//use existing instance from table
	localChildren.add(entityTable.get(ejbJar));
	}
	//}

	//ENABLE FOR: NOT TO SHOW EMPTY GROUPS
	//if (is20Jar && messageBeans.size() > 0) {
	if (is20Jar) {
	if (messageTable.get(ejbJar) == null) {
	//create new item provider instance
	messageProvider = new GroupedMessageItemProvider(adapterFactory, null, getImage(MESSAGE), object, messageBeans);
	messageTable.put(ejbJar, messageProvider);
	localChildren.add(messageProvider);
	} else {
	//use existing instance from table
	localChildren.add(messageTable.get(ejbJar));
	}
	}
	//}

	children.put(object, localChildren);

	return localChildren;
	}

	protected void orderBeans(List beans) {
	Object[] beansArray = beans.toArray();
	Arrays.sort(beansArray, EJBNameComparator.singleton());
	beans.clear();
	beans.addAll(Arrays.asList(beansArray));
	}

	protected static List getAllRootBeans(EJBJar ejbJar) {
	return ejbJar.getEnterpriseBeans();
	}

	protected void catagorizeBeans(List allRootBeans, List entityBeans, List sessionBeans, List messageBeans) {
	for (int i = 0; i < allRootBeans.size(); i++) {
	if (((EnterpriseBean) allRootBeans.get(i)).isSession()) {
	sessionBeans.add(allRootBeans.get(i));
	} else if (((EnterpriseBean) allRootBeans.get(i)).isEntity()) {
	entityBeans.add(allRootBeans.get(i));
	} else if (((EnterpriseBean) allRootBeans.get(i)).isMessageDriven()) {
	messageBeans.add(allRootBeans.get(i));
	}
	}
	}

	static protected GroupedSessionItemProvider getSessionNode(Object object) {
	return (GroupedSessionItemProvider) sessionTable.get(object);
	}

	static protected GroupedEntityItemProvider getEntityNode(Object object) {
	return (GroupedEntityItemProvider) entityTable.get(object);
	}

	static protected GroupedMessageItemProvider getMessageNode(Object object) {
	return (GroupedMessageItemProvider) messageTable.get(object);
	}

	public Object getImage(String type) {
	if (type.equals(SESSION))
	return J2EEPlugin.getPlugin().getImage("sessionBean_obj"); //$NON-NLS-1$
	else if (type.equals(MESSAGE))
	return J2EEPlugin.getPlugin().getImage("message_bean_obj"); //$NON-NLS-1$
	else if (type.equals(ENTITY))
	return J2EEPlugin.getPlugin().getImage("entitybean_obj"); //$NON-NLS-1$
	else
	return null;
	}

	private boolean is20Jar(EJBJar ejbJar) {
	switch (ejbJar.getVersionID()) {
	case J2EEVersionConstants.EJB_1_0_ID :
	case J2EEVersionConstants.EJB_1_1_ID :
	return false;
	case J2EEVersionConstants.EJB_2_0_ID :
	case J2EEVersionConstants.EJB_2_1_ID :
	default :
	return true;
	}
	}

	public void notifyChanged(Notification notification) {
	if (notification.getEventType() == Notification.REMOVING_ADAPTER && notification.getOldValue() == this && !isDisposing) {
	removeTarget(notification);
	return;
	}
	if (notification.getFeature() == EjbPackage.eINSTANCE.getEJBJar_EnterpriseBeans()) {
	J2EEItemProvider provider = beansChanged((EJBJar) notification.getNotifier(), notification.getEventType(), notification.getOldValue(), notification.getNewValue(), notification.getPosition());

	//EJB's group has not been added yet, need to add group to tree before EJB can be added
	if (provider == null) {
	Notification msg = new NotificationImpl(Notification.ADD, null, getEJBItemProvider((EnterpriseBean) notification.getNewValue()), 1);
	NotificationWrapper notificationWrapper = new NotificationWrapper(notification.getNotifier(), msg);
	fireNotifyChanged(notificationWrapper);
	provider = beansChanged((EJBJar) notification.getNotifier(), notification.getEventType(), notification.getOldValue(), notification.getNewValue(), notification.getPosition());
	}

	//Fire notification for EJB add or remove
	NotificationWrapper notificationWrapper = new NotificationWrapper(provider, notification);
	fireNotifyChanged(notificationWrapper);

	//ENABLE FOR: NOT TO SHOW EMPTY GROUPS
	//If Group is empty remove the group
	/*
	* if (provider != null && provider.getChildren().size() == 0) { Notification msg = new
	* NotificationImpl(Notification.REMOVE, provider, null, 1); notificationWrapper = new
	* NotificationWrapper(notification.getNotifier(), msg);
	* fireNotifyChanged(notificationWrapper);
	*
	* //Group is removed so flush out table entry if (provider instanceof
	* GroupedSessionItemProvider) { sessionTable.remove(notification.getNotifier());
	* provider = null; } else if (provider instanceof GroupedEntityItemProvider) {
	* entityTable.remove(notification.getNotifier()); provider = null; } else if (provider
	* instanceof GroupedMessageItemProvider) {
	* messageTable.remove(notification.getNotifier()); provider = null; }
	*
	* //If all groups are removed remove the extended children List allChildren = new
	* ArrayList(this.getChildren((EJBJar) notification.getNotifier()));
	* if(sessionTable.get(notification.getNotifier()) == null &&
	* entityTable.get(notification.getNotifier()) == null &&
	* messageTable.get(notification.getNotifier()) == null) { for(int i = 0; i <
	* allChildren.size(); i++) { Notification message = new
	* NotificationImpl(Notification.REMOVE, allChildren.get(i), null, 1);
	* notificationWrapper = new NotificationWrapper(notification.getNotifier(), message);
	* fireNotifyChanged(notificationWrapper); } this.getChildren((EJBJar)
	* notification.getNotifier()).clear(); } }
	*/
	} else {
	super.notifyChanged(notification);
	}
	}

	protected J2EEItemProvider beansChanged(EJBJar ejbJar, int eventType, Object oldValue, Object newValue, int pos) {
	J2EEItemProvider provider = getItemProvider(ejbJar, oldValue, newValue);

	if (provider != null) {
	Collection grandChildren = provider.getChildren();

	switch (eventType) {
	case Notification.ADD : {
	if (!grandChildren.contains(newValue))
	grandChildren.add(newValue);

	break;
	}
	case Notification.ADD_MANY : {
	grandChildren.addAll((Collection) newValue);
	break;
	}
	case Notification.REMOVE : {
	grandChildren.remove(oldValue);
	break;
	}
	case Notification.REMOVE_MANY : {
	grandChildren.removeAll((Collection) oldValue);
	break;
	}
	}
	} else {
	//GroupedProvider for new bean does not exist, create one.
	List allRootBeans = getAllRootBeans(ejbJar);

	List entityBeans = new ArrayList();
	List sessionBeans = new ArrayList();
	List messageBeans = new ArrayList();

	catagorizeBeans(allRootBeans, entityBeans, sessionBeans, messageBeans);

	if (newValue instanceof Session) {
	sessionProvider = new GroupedSessionItemProvider(adapterFactory, null, getImage(SESSION), ejbJar, sessionBeans);
	sessionTable.put(ejbJar, sessionProvider);
	} else if (newValue instanceof Entity) {
	entityProvider = new GroupedEntityItemProvider(adapterFactory, null, getImage(ENTITY), ejbJar, entityBeans);
	entityTable.put(ejbJar, entityProvider);
	} else if (newValue instanceof MessageDriven) {
	messageProvider = new GroupedMessageItemProvider(adapterFactory, null, getImage(MESSAGE), ejbJar, messageBeans);
	messageTable.put(ejbJar, messageProvider);
	}
	}
	return provider;
	}

	static public J2EEItemProvider getEJBJarItemProvider(EJBJar ejbJar, Object bean) {
	J2EEItemProvider provider = null;
	if (ejbJar != null && bean != null) {
	if (bean instanceof Session) {
	provider = getSessionNode(ejbJar);
	} else if (bean instanceof Entity) {
	provider = getEntityNode(ejbJar);
	} else if (bean instanceof MessageDriven) {
	provider = getMessageNode(ejbJar);
	}
	}
	return provider;
	}

	static public J2EEItemProvider getEJBItemProvider(EnterpriseBean bean) {
	if (bean != null) {
	EJBJar ejbJar = bean.getEjbJar();
	return getEJBJarItemProvider(ejbJar, bean);
	}
	return null;
	}

	protected J2EEItemProvider getItemProvider(EJBJar ejbJar, Object oldValue, Object newValue) {
	if (newValue != null)
	return getEJBJarItemProvider(ejbJar, newValue);
	else if (oldValue != null)
	return getEJBJarItemProvider(ejbJar, oldValue);
	else
	return null;
	}

	public static boolean isRootBean(EnterpriseBean bean) {
	List allRootBeans = getAllRootBeans(bean.getEjbJar());
	if (allRootBeans != null && allRootBeans.contains(bean)) {
	return true;
	}
	return false;
	}

	// Utility method for garbage collection - if EJBJar removed, remove
	// all entires in table for EJBJar
	static public void flushOutTableEntriesForEJBJar(EJBJar ejbJar) {
	sessionTable.remove(ejbJar);
	entityTable.remove(ejbJar);
	messageTable.remove(ejbJar);
	}

	public boolean hasChildren(Object parent) {
	return true;
	}

	/*
	* (non-Javadoc)
	*
	* @see org.eclipse.jst.j2ee.internal.internal.ejb.provider.EJBJarItemProvider#removeTarget(org.eclipse.emf.common.notify.Notification)
	*/
	protected void removeTarget(Notification not) {
	if (not.getNotifier() instanceof EJBJar)
	flushOutTableEntriesForEJBJar((EJBJar) not.getNotifier());
	}

	/*
	* (non-Javadoc)
	*
	* @see org.eclipse.emf.edit.provider.ItemProviderAdapter#dispose()
	*/
	public void dispose() {
	try {
	isDisposing = true;
	super.dispose();
	} finally {
	isDisposing = false;
	}
	}
	}