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/*
* 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 org.hibernate.EntityMode;
import org.hibernate.persister.collection.CollectionPersister;
import org.hibernate.pretty.MessageHelper;
import org.hibernate.type.Type;
import java.io.Serializable;
import java.io.ObjectOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
/**
* Uniquely identifies a collection instance in a particular session.
*
* @author Gavin King
*/
public final class CollectionKey implements Serializable {
private final String role;
private final Serializable key;
private final Type keyType;
private final SessionFactoryImplementor factory;
private final int hashCode;
private EntityMode entityMode;
public CollectionKey(CollectionPersister persister, Serializable key, EntityMode em) {
this( persister.getRole(), key, persister.getKeyType(), em, persister.getFactory() );
}
private CollectionKey(
String role,
Serializable key,
Type keyType,
EntityMode entityMode,
SessionFactoryImplementor factory) {
this.role = role;
this.key = key;
this.keyType = keyType;
this.entityMode = entityMode;
this.factory = factory;
this.hashCode = generateHashCode(); //cache the hashcode
}
public boolean equals(Object other) {
CollectionKey that = (CollectionKey) other;
return that.role.equals(role) &&
keyType.isEqual(that.key, key, entityMode, factory);
}
public int generateHashCode() {
int result = 17;
result = 37 * result + role.hashCode();
result = 37 * result + keyType.getHashCode(key, entityMode, factory);
return result;
}
public int hashCode() {
return hashCode;
}
public String getRole() {
return role;
}
public Serializable getKey() {
return key;
}
public String toString() {
return "CollectionKey" +
MessageHelper.collectionInfoString( factory.getCollectionPersister(role), key, 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 java.io.IOException
*/
void serialize(ObjectOutputStream oos) throws IOException {
oos.writeObject( role );
oos.writeObject( key );
oos.writeObject( keyType );
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 CollectionKey
* @throws IOException
* @throws ClassNotFoundException
*/
static CollectionKey deserialize(
ObjectInputStream ois,
SessionImplementor session) throws IOException, ClassNotFoundException {
return new CollectionKey(
( String ) ois.readObject(),
( Serializable ) ois.readObject(),
( Type ) ois.readObject(),
EntityMode.parse( ( String ) ois.readObject() ),
( session == null ? null : session.getFactory() )
);
}
}