javax.persistence.Persistence Maven / Gradle / Ivy
Show all versions of javax.persistence Show documentation
/*******************************************************************************
* Copyright (c) 2008 - 2013 Oracle Corporation. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0
* which accompanies this distribution.
* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
* and the Eclipse Distribution License is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* Contributors:
* Linda DeMichiel - Java Persistence 2.1
* Linda DeMichiel - Java Persistence 2.0
*
******************************************************************************/
package javax.persistence;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.HashSet;
import javax.persistence.spi.PersistenceProvider;
import javax.persistence.spi.PersistenceProviderResolver;
import javax.persistence.spi.PersistenceProviderResolverHolder;
import javax.persistence.spi.LoadState;
/**
* Bootstrap class that is used to obtain an {@link EntityManagerFactory}
* in Java SE environments. It may also be used to cause schema
* generation to occur.
*
* The Persistence class is available in a Java EE
* container environment as well; however, support for the Java SE
* bootstrapping APIs is not required in container environments.
*
*
The Persistence class is used to obtain a {@link
* javax.persistence.PersistenceUtil PersistenceUtil} instance in both
* Java EE and Java SE environments.
*
* @since Java Persistence 1.0
*/
public class Persistence {
/**
* 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, null);
}
/**
* Create and return an EntityManagerFactory for the named persistence unit
* using the given properties.
*
* @param persistenceUnitName
* the name of the persistence unit
* @param properties
* Additional properties to use when creating the factory.
* These properties may include properties to control
* schema generation. The values of these properties override
* any values that may have been configured elsewhere.
* @return the factory that creates EntityManagers configured according to
* the specified persistence unit.
*/
public static EntityManagerFactory createEntityManagerFactory(String persistenceUnitName, Map properties) {
EntityManagerFactory emf = null;
PersistenceProviderResolver resolver = PersistenceProviderResolverHolder.getPersistenceProviderResolver();
List providers = resolver.getPersistenceProviders();
for (PersistenceProvider provider : providers) {
emf = provider.createEntityManagerFactory(persistenceUnitName, properties);
if (emf != null) {
break;
}
}
if (emf == null) {
throw new PersistenceException("No Persistence provider for EntityManager named " + persistenceUnitName);
}
return emf;
}
/**
* Create database schemas and/or tables and/or create DDL
* scripts as determined by the supplied properties.
*
* Called when schema generation is to occur as a separate phase
* from creation of the entity manager factory.
*
* @param persistenceUnitName the name of the persistence unit
* @param map properties for schema generation; these may
* also contain provider-specific properties. The
* value of these properties override any values that
* may have been configured elsewhere..
* @throws PersistenceException if insufficient or inconsistent
* configuration information is provided or if schema
* generation otherwise fails.
*
* @since Java Persistence 2.1
*/
public static void generateSchema(String persistenceUnitName, Map map) {
PersistenceProviderResolver resolver = PersistenceProviderResolverHolder.getPersistenceProviderResolver();
List providers = resolver.getPersistenceProviders();
for (PersistenceProvider provider : providers) {
if (provider.generateSchema(persistenceUnitName, map)) {
return;
}
}
throw new PersistenceException("No Persistence provider to generate schema named " + persistenceUnitName);
}
/**
* Return the PersistenceUtil instance
* @return PersistenceUtil instance
* @since Java Persistence 2.0
*/
public static PersistenceUtil getPersistenceUtil() {
return new PersistenceUtilImpl();
}
/**
* Implementation of PersistenceUtil interface
* @since Java Persistence 2.0
*/
private static class PersistenceUtilImpl implements PersistenceUtil {
public boolean isLoaded(Object entity, String attributeName) {
PersistenceProviderResolver resolver = PersistenceProviderResolverHolder.getPersistenceProviderResolver();
List providers = resolver.getPersistenceProviders();
for (PersistenceProvider provider : providers) {
LoadState loadstate = provider.getProviderUtil().isLoadedWithoutReference(entity, attributeName);
if(loadstate == LoadState.LOADED) {
return true;
} else if (loadstate == LoadState.NOT_LOADED) {
return false;
} // else continue
}
//None of the providers could determine the load state try isLoadedWithReference
for (PersistenceProvider provider : providers) {
LoadState loadstate = provider.getProviderUtil().isLoadedWithReference(entity, attributeName);
if(loadstate == LoadState.LOADED) {
return true;
} else if (loadstate == LoadState.NOT_LOADED) {
return false;
} // else continue
}
//None of the providers could determine the load state.
return true;
}
public boolean isLoaded(Object entity) {
PersistenceProviderResolver resolver = PersistenceProviderResolverHolder.getPersistenceProviderResolver();
List providers = resolver.getPersistenceProviders();
for (PersistenceProvider provider : providers) {
LoadState loadstate = provider.getProviderUtil().isLoaded(entity);
if(loadstate == LoadState.LOADED) {
return true;
} else if (loadstate == LoadState.NOT_LOADED) {
return false;
} // else continue
}
//None of the providers could determine the load state
return true;
}
}
/**
* This final String is deprecated and should be removed and is only here for TCK backward compatibility
* @since Java Persistence 1.0
* @deprecated
*/
@Deprecated
public static final String PERSISTENCE_PROVIDER = "javax.persistence.spi.PeristenceProvider";
/**
* This instance variable is deprecated and should be removed and is only here for TCK backward compatibility
* @since Java Persistence 1.0
* @deprecated
*/
@Deprecated
protected static final Set providers = new HashSet();
}