/*******************************************************************************
* * Copyright 2012 Impetus Infotech.
* *
* * Licensed 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.
******************************************************************************/
package com.impetus.kundera.metadata;
import java.util.List;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.impetus.kundera.KunderaException;
import com.impetus.kundera.metadata.model.EntityMetadata;
import com.impetus.kundera.metadata.model.MetamodelImpl;
import com.impetus.kundera.metadata.model.PersistenceUnitMetadata;
import com.impetus.kundera.persistence.EntityManagerFactoryImpl.KunderaMetadata;
/**
* The Class KunderaMetadataManager.
*
* @author amresh.singh
*/
public class KunderaMetadataManager
{
/** The log. */
private static Logger log = LoggerFactory.getLogger(KunderaMetadataManager.class);
/**
* Gets the persistence unit metadata.
*
* @param persistenceUnit
* the persistence unit
* @return the persistence unit metadata
*/
public static PersistenceUnitMetadata getPersistenceUnitMetadata(final KunderaMetadata kunderaMetadata,
String persistenceUnit)
{
if (persistenceUnit != null && kunderaMetadata != null)
{
return kunderaMetadata.getApplicationMetadata().getPersistenceUnitMetadata(persistenceUnit);
}
return null;
}
/**
* Gets the metamodel.
*
* @param persistenceUnit
* the persistence unit
* @return the metamodel
*/
public static MetamodelImpl getMetamodel(final KunderaMetadata kunderaMetadata, String persistenceUnit)
{
MetamodelImpl metamodel = (MetamodelImpl) kunderaMetadata.getApplicationMetadata()
.getMetamodel(persistenceUnit);
return metamodel;
}
/**
* Gets the metamodel.
*
* @param persistenceUnits
* the persistence units
* @return the metamodel
*/
public static MetamodelImpl getMetamodel(final KunderaMetadata kunderaMetadata, String... persistenceUnits)
{
MetamodelImpl metamodel = null;
for (String pu : persistenceUnits)
{
metamodel = (MetamodelImpl) kunderaMetadata.getApplicationMetadata().getMetamodel(pu);
if (metamodel != null)
{
return metamodel;
}
}
// FIXME: I need to verify this why we need common entity metadata now!
// if (metamodel == null)
// {
// metamodel = (MetamodelImpl)
// kunderaMetadata.getApplicationMetadata().getMetamodel(
// Constants.COMMON_ENTITY_METADATAS);
// }
return metamodel;
}
/**
* Gets the entity metadata.
*
* @param persistenceUnit
* the persistence unit
* @param entityClass
* the entity class
* @return the entity metadata
*/
public static EntityMetadata getEntityMetadata(final KunderaMetadata kunderaMetadata, String persistenceUnit,
Class entityClass)
{
return getMetamodel(kunderaMetadata, persistenceUnit).getEntityMetadata(entityClass);
}
/**
* Finds ands returns Entity metadata for a given array of PUs.
*
* @param entityClass
* the entity class
* @param persistenceUnits
* the persistence units
* @return the entity metadata
*/
public static EntityMetadata getEntityMetadata(final KunderaMetadata kunderaMetadata, Class entityClass)
{
if (entityClass == null)
{
throw new KunderaException("Invalid class provided " + entityClass);
}
List<String> persistenceUnits = kunderaMetadata.getApplicationMetadata().getMappedPersistenceUnit(entityClass);
// persistence units will only have more than 1 persistence unit in case
// of RDBMS.
if (persistenceUnits != null)
{
for (String pu : persistenceUnits)
{
MetamodelImpl metamodel = getMetamodel(kunderaMetadata, pu);
EntityMetadata metadata = metamodel.getEntityMetadata(entityClass);
if (metadata != null && metadata.getPersistenceUnit().equals(pu))
{
return metadata;
}
}
}
if (log.isDebugEnabled())
log.warn("No Entity metadata found for the class " + entityClass
+ ". Any CRUD operation on this entity will fail."
+ "If your entity is for RDBMS, make sure you put fully qualified entity class"
+ " name under <class></class> tag in persistence.xml for RDBMS "
+ "persistence unit. Returning null value.");
return null;
// throw new KunderaException("Unable to load entity metadata for :" +
// entityClass);
}
}