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/*
* The contents of this file are subject to the terms
* of the Common Development and Distribution License
* (the License). You may not use this file except in
* compliance with the License.
*
* You can obtain a copy of the license at
* https://glassfish.dev.java.net/public/CDDLv1.0.html or
* glassfish/bootstrap/legal/CDDLv1.0.txt.
* See the License for the specific language governing
* permissions and limitations under the License.
*
* When distributing Covered Code, include this CDDL
* Header Notice in each file and include the License file
* at glassfish/bootstrap/legal/CDDLv1.0.txt.
* If applicable, add the following below the CDDL Header,
* with the fields enclosed by brackets [] replaced by
* you own identifying information:
* "Portions Copyrighted [year] [name of copyright owner]"
*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
*/
package javax.persistence;
/**
* Interface used to interact with the persistence context.
*/
public interface EntityManager {
/**
* Make an instance managed and persistent.
* @param entity
* @throws IllegalArgumentException if not an entity
* or entity is detached
* @throws TransactionRequiredException if there is
* no transaction
*/
public void persist(Object entity);
/**
* Merge the state of the given entity into the
* current persistence context.
* @param entity
* @return the instance that the state was merged to
* @throws IllegalArgumentException if instance is not an
* entity or is a removed entity
* @throws TransactionRequiredException if there is
* no transaction
*/
public T merge(T entity);
/**
* Remove the instance.
* @param entity
* @throws IllegalArgumentException if not an entity
* or if a detached entity
* @throws TransactionRequiredException if there is
* no transaction
*/
public void remove(Object entity);
/**
* Find by primary key.
* @param entityClass
* @param primaryKey
* @return the found entity instance or null
* if the entity does not exist
* @throws IllegalArgumentException if the first argument does
* not denote an entity type or the second
* argument is not a valid type for that
* entity's primary key
*/
public T find(Class entityClass, Object primaryKey);
/**
* Get an instance, whose state may be lazily fetched.
* If the requested instance does not exist in the database,
* throws EntityNotFoundException when the instance state is
* first accessed. (The container is permitted to throw
* EntityNotFoundException when get is called.)
* The application should not expect that the instance state will
* be available upon detachment, unless it was accessed by the
* application while the entity manager was open.
* @param entityClass
* @param primaryKey
* @return the found entity instance
* @throws IllegalArgumentException if the first argument does
* not denote an entity type or the second
* argument is not a valid type for that
* entity's primary key
* @throws EntityNotFoundException if the entity state
* cannot be accessed
*/
public T getReference(Class entityClass, Object primaryKey);
/**
* Synchronize the persistence context to the
* underlying database.
* @throws TransactionRequiredException if there is
* no transaction
* @throws PersistenceException if the flush fails
*/
public void flush();
/**
* Refresh the state of the instance from the database,
* overwriting changes made to the entity, if any.
* @param entity
* @throws IllegalArgumentException if not an entity
* or entity is not managed
* @throws TransactionRequiredException if there is
* no transaction
* @throws EntityNotFoundException if the entity no longer
* exists in the database
*/
public void refresh(Object entity);
/**
* Check if the instance belongs to the current persistence
* context.
* @param entity
* @return
* @throws IllegalArgumentException if not an entity
*/
public boolean contains(Object entity);
/**
* Create an instance of Query for executing an
* EJB QL statement.
* @param ejbqlString an EJB QL query string
* @return the new query instance
* @throws IllegalArgumentException if query string is not valid
*/
public Query createQuery(String ejbqlString);
/**
* Create an instance of Query for executing a
* named query (in EJB QL or native SQL).
* @param name the name of a query defined in metadata
* @return the new query instance
* @throws IllegalArgumentException if query string is not valid
*/
public Query createNamedQuery(String name);
/**
* Create an instance of Query for executing
* a native SQL statement.
* @param sqlString a native SQL query string
* @return the new query instance
* @throws IllegalArgumentException if query string is not valid
*/
public Query createNativeQuery(String sqlString);
/**
* Create an instance of Query for executing
* a native SQL query.
* @param sqlString a native SQL query string
* @param resultClass the class of the resulting instances
* @return the new query instance
* @throws IllegalArgumentException if query string is not valid
*/
public Query createNativeQuery(String sqlString, Class resultClass);
/**
* Create an instance of Query for executing
* a native SQL query.
* @param sqlString a native SQL query string
* @param resultSetMapping the name of the result set mapping
* @return the new query instance
* @throws IllegalArgumentException if query string is not valid
*/
public Query createNativeQuery(String sqlString, String resultSetMapping);
/**
* Closes an application-managed EntityManager.
* This method can only be called when the EntityManager
* is not associated with an active transaction.
* After an EntityManager has been closed, all methods on the
* EntityManager instance will throw the IllegalStateException
* except for isOpen, which will return false.
* @throws IllegalStateException if the EntityManager is
* associated with an active transaction or if the
* EntityManager is container-managed.
*/
public void close();
/**
* Indicates whether the EntityManager is open.
* @return true until the EntityManager has been closed.
*/
public boolean isOpen();
/**
* Set the lock mode for an entity object contained
* in the persistence context.
* @param entity
* @param lockMode
* @throws PersistenceException if an unsupported lock call
* is made
* @throws IllegalArgumentException if the instance is not
* an entity or is a detached entity
* @throws TransactionRequiredException if there is no
* transaction
*/
public void lock(Object entity, LockModeType lockMode);
/**
* Clear the persistence context, causing all managed
* entities to become detached. Changes made to entities that
* have not been flushed to the database will not be
* persisted.
*/
public void clear();
/**
* Return the underlying provider object for the EntityManager,
* if available. The result of this method is implementation
* specific.
*/
public Object getDelegate();
/**
* Returns the resource-level transaction object.
* The EntityTransaction instance may be used serially to
* begin and commit multiple transactions.
* @return EntityTransaction instance
* @throws IllegalStateException if invoked on a JTA
* EntityManager or an EntityManager that has been closed.
*/
public EntityTransaction getTransaction();
/**
* Get the flush mode that applies to all objects contained
* in the persistence context.
* @return flushMode
*/
public FlushModeType getFlushMode();
/**
* Set the flush mode that applies to all objects contained
* in the persistence context.
* @param flushMode
*/
public void setFlushMode(FlushModeType flushMode);
/**
* Indicate to the EntityManager that a JTA transaction is
* active. This method should be called on a JTA application
* managed EntityManager that was created outside the scope
* of the active transaction to associate it with the current
* JTA transaction.
* @throws TransactionRequiredException if there is
* no transaction.
*/
public void joinTransaction();
}