/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2008, Red Hat Middleware LLC or third-party contributors as
* indicated by the @author tags or express copyright attribution
* statements applied by the authors. All third-party contributions are
* distributed under license by Red Hat Middleware LLC.
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*
*/
package org.hibernate.engine;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import org.hibernate.AssertionFailure;
import org.hibernate.EntityMode;
import org.hibernate.persister.entity.EntityPersister;
import org.hibernate.pretty.MessageHelper;
import org.hibernate.type.Type;
/**
* Uniquely identifies of an entity instance in a particular session by identifier.
* <p/>
* Uniqueing information consists of the entity-name and the identifier value.
*
* @see EntityUniqueKey
* @author Gavin King
*/
public final class EntityKey implements Serializable {
private final Serializable identifier;
private final String rootEntityName;
private final String entityName;
private final Type identifierType;
private final boolean isBatchLoadable;
private final SessionFactoryImplementor factory;
private final int hashCode;
private final EntityMode entityMode;
/**
* Construct a unique identifier for an entity class instance
*/
public EntityKey(Serializable id, EntityPersister persister, EntityMode entityMode) {
if ( id == null ) {
throw new AssertionFailure( "null identifier" );
}
this.identifier = id;
this.entityMode = entityMode;
this.rootEntityName = persister.getRootEntityName();
this.entityName = persister.getEntityName();
this.identifierType = persister.getIdentifierType();
this.isBatchLoadable = persister.isBatchLoadable();
this.factory = persister.getFactory();
hashCode = generateHashCode(); //cache the hashcode
}
/**
* Used to reconstruct an EntityKey during deserialization.
*
* @param identifier The identifier value
* @param rootEntityName The root entity name
* @param entityName The specific entity name
* @param identifierType The type of the identifier value
* @param batchLoadable Whether represented entity is eligible for batch loading
* @param factory The session factory
* @param entityMode The entity's entity mode
*/
private EntityKey(
Serializable identifier,
String rootEntityName,
String entityName,
Type identifierType,
boolean batchLoadable,
SessionFactoryImplementor factory,
EntityMode entityMode) {
this.identifier = identifier;
this.rootEntityName = rootEntityName;
this.entityName = entityName;
this.identifierType = identifierType;
this.isBatchLoadable = batchLoadable;
this.factory = factory;
this.entityMode = entityMode;
this.hashCode = generateHashCode();
}
public boolean isBatchLoadable() {
return isBatchLoadable;
}
/**
* Get the user-visible identifier
*/
public Serializable getIdentifier() {
return identifier;
}
public String getEntityName() {
return entityName;
}
public boolean equals(Object other) {
EntityKey otherKey = (EntityKey) other;
return otherKey.rootEntityName.equals(this.rootEntityName) &&
identifierType.isEqual(otherKey.identifier, this.identifier, entityMode, factory);
}
private int generateHashCode() {
int result = 17;
result = 37 * result + rootEntityName.hashCode();
result = 37 * result + identifierType.getHashCode( identifier, entityMode, factory );
return result;
}
public int hashCode() {
return hashCode;
}
public String toString() {
return "EntityKey" +
MessageHelper.infoString( factory.getEntityPersister( entityName ), identifier, factory );
}
/**
* Custom serialization routine used during serialization of a
* Session/PersistenceContext for increased performance.
*
* @param oos The stream to which we should write the serial data.
* @throws IOException
*/
void serialize(ObjectOutputStream oos) throws IOException {
oos.writeObject( identifier );
oos.writeObject( rootEntityName );
oos.writeObject( entityName );
oos.writeObject( identifierType );
oos.writeBoolean( isBatchLoadable );
oos.writeObject( entityMode.toString() );
}
/**
* Custom deserialization routine used during deserialization of a
* Session/PersistenceContext for increased performance.
*
* @param ois The stream from which to read the entry.
* @param session The session being deserialized.
* @return The deserialized EntityEntry
* @throws IOException
* @throws ClassNotFoundException
*/
static EntityKey deserialize(
ObjectInputStream ois,
SessionImplementor session) throws IOException, ClassNotFoundException {
return new EntityKey(
( Serializable ) ois.readObject(),
( String ) ois.readObject(),
( String ) ois.readObject(),
( Type ) ois.readObject(),
ois.readBoolean(),
session.getFactory(),
EntityMode.parse( ( String ) ois.readObject() )
);
}
}