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
}

Construct a unique identifier for an entity class instance

 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() )
		);
}

Custom deserialization routine used during deserialization of a Session/PersistenceContext for increased performance.

 public boolean equals(Object other) 
{
		EntityKey otherKey = (EntityKey) other;
		return otherKey.rootEntityName.equals(this.rootEntityName) && 
			identifierType.isEqual(otherKey.identifier, this.identifier, entityMode, factory);
}

 public String getEntityName() 
{
		return entityName;
}

 public Serializable getIdentifier() 
{
		return identifier;
}

Get the user-visible identifier

 public int hashCode() 
{
		return hashCode;
}

 public boolean isBatchLoadable() 
{
		return isBatchLoadable;
}

  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 serialization routine used during serialization of a Session/PersistenceContext for increased performance.

 public String toString() 
{
		return "EntityKey" + 
			MessageHelper.infoString( factory.getEntityPersister( entityName ), identifier, factory );
}