| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| // |
| // This source code implements specifications defined by the Java |
| // Community Process. In order to remain compliant with the specification |
| // DO NOT add / change / or delete method signatures! |
| // |
| package javax.persistence; |
| |
| import java.io.BufferedReader; |
| import java.io.IOException; |
| import java.io.InputStreamReader; |
| import java.net.URL; |
| import java.util.Collections; |
| import java.util.Enumeration; |
| import java.util.HashSet; |
| import java.util.Map; |
| import java.util.Set; |
| |
| import javax.persistence.spi.PersistenceProvider; |
| |
| /** |
| * @version $Rev$ $Date$ |
| */ |
| |
| /** |
| * Bootstrap class that is used to obtain {@link javax.persistence.EntityManagerFactory} |
| * references. |
| */ |
| public class Persistence { |
| |
| protected static final Set<PersistenceProvider> providers = new HashSet<PersistenceProvider>(); |
| // Changed to the hard coded PERSISTENCE_PROVIDER value to pass signature tests. |
| // public static final java.lang.String PERSISTENCE_PROVIDER = PersistenceProvider.class.getName(); |
| public static final java.lang.String PERSISTENCE_PROVIDER = "javax.persistence.spi.PersistenceProvider"; |
| static final String PERSISTENCE_PROVIDER_PROPERTY = "javax.persistence.provider"; |
| static final String PERSISTENCE_PROVIDER_SERVICE = "META-INF/services/" |
| + PersistenceProvider.class.getName(); |
| |
| /** |
| * Create and return an EntityManagerFactory for the named persistence unit. |
| * |
| * @param persistenceUnitName The name of the persistence unit |
| * @return The factory that creates EntityManagers configured according to the specified persistence unit |
| */ |
| public static EntityManagerFactory createEntityManagerFactory(String persistenceUnitName) { |
| return createEntityManagerFactory(persistenceUnitName, Collections.EMPTY_MAP); |
| } |
| |
| public static EntityManagerFactory createEntityManagerFactory(String persistenceUnitName, Map properties) { |
| |
| if (properties == null) { |
| properties = Collections.EMPTY_MAP; |
| } |
| |
| // start by loading a provider explicitly specified in properties. The spec |
| // doesn't seem to forbid providers that are not deployed as a service |
| Object providerName = properties.get(PERSISTENCE_PROVIDER_PROPERTY); |
| if (providerName instanceof String) { |
| EntityManagerFactory factory = createFactory(providerName.toString(), persistenceUnitName, properties); |
| if (factory != null) { |
| return factory; |
| } |
| } |
| |
| // If we are deployed into an OSGi environment, leverage it |
| Class<? extends PersistenceProvider> providerClass = org.apache.servicemix.specs.locator.OsgiLocator.locate(PersistenceProvider.class); |
| if (providerClass != null) { |
| try { |
| PersistenceProvider provider = providerClass.newInstance(); |
| return provider.createEntityManagerFactory(persistenceUnitName, properties); |
| } |
| catch (Exception e) { |
| throw new PersistenceException("Provider error. Provider: " + providerName, e); |
| } |
| } |
| |
| // load correctly deployed providers |
| ClassLoader loader = Thread.currentThread().getContextClassLoader(); |
| try { |
| Enumeration<URL> providers = loader.getResources(PERSISTENCE_PROVIDER_SERVICE); |
| while (providers.hasMoreElements()) { |
| |
| String name = getProviderName(providers.nextElement()); |
| |
| if (name != null) { |
| |
| EntityManagerFactory factory = createFactory(name, persistenceUnitName, properties); |
| |
| if (factory != null) { |
| return factory; |
| } |
| } |
| } |
| } |
| catch (IOException e) { |
| // spec doesn't mention any exceptions thrown by this method |
| } |
| |
| return null; |
| } |
| |
| static String getProviderName(URL url) throws IOException { |
| |
| BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream(), "UTF-8")); |
| |
| String providerName; |
| |
| try { |
| providerName = in.readLine(); |
| } |
| finally { |
| in.close(); |
| } |
| |
| if (providerName != null) { |
| providerName = providerName.trim(); |
| } |
| |
| return providerName; |
| } |
| |
| static EntityManagerFactory createFactory(String providerName, String persistenceUnitName, Map properties) throws PersistenceException { |
| |
| Class providerClass; |
| try { |
| providerClass = Class.forName(providerName, true, Thread.currentThread().getContextClassLoader()); |
| } |
| catch (Exception e) { |
| throw new PersistenceException("Invalid or inaccessible provider class: " + providerName, e); |
| } |
| |
| try { |
| PersistenceProvider provider = (PersistenceProvider) providerClass.newInstance(); |
| return provider.createEntityManagerFactory(persistenceUnitName, properties); |
| } |
| catch (Exception e) { |
| throw new PersistenceException("Provider error. Provider: " + providerName, e); |
| } |
| |
| } |
| |
| } |