/*
* 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.tuple.entity;
import java.util.Map;
import java.lang.reflect.Constructor;
import java.io.Serializable;
import org.hibernate.util.FastHashMap;
import org.hibernate.util.ReflectHelper;
import org.hibernate.EntityMode;
import org.hibernate.HibernateException;
import org.hibernate.mapping.PersistentClass;
/**
* A registry allowing users to define the default {@link EntityTuplizer} class to use per {@link EntityMode}.
*
* @author Steve Ebersole
*/
public class EntityTuplizerFactory implements Serializable {
public static final Class[] ENTITY_TUP_CTOR_SIG = new Class[] { EntityMetamodel.class, PersistentClass.class };
private Map defaultImplClassByMode = buildBaseMapping();
/**
* Method allowing registration of the tuplizer class to use as default for a particular entity-mode.
*
* @param entityMode The entity-mode for which to register the tuplizer class
* @param tuplizerClass The class to use as the default tuplizer for the given entity-mode.
*/
public void registerDefaultTuplizerClass(EntityMode entityMode, Class tuplizerClass) {
assert isEntityTuplizerImplementor( tuplizerClass )
: "Specified tuplizer class [" + tuplizerClass.getName() + "] does not implement " + EntityTuplizer.class.getName();
assert hasProperConstructor( tuplizerClass )
: "Specified tuplizer class [" + tuplizerClass.getName() + "] is not properly instantiatable";
defaultImplClassByMode.put( entityMode, tuplizerClass );
}
/**
* Construct an instance of the given tuplizer class.
*
* @param tuplizerClassName The name of the tuplizer class to instantiate
* @param metamodel The metadata for the entity.
* @param persistentClass The mapping info for the entity.
*
* @return The instantiated tuplizer
*
* @throws HibernateException If class name cannot be resolved to a class reference, or if the
* {@link Constructor#newInstance} call fails.
*/
public EntityTuplizer constructTuplizer(
String tuplizerClassName,
EntityMetamodel metamodel,
PersistentClass persistentClass) {
try {
Class tuplizerClass = ReflectHelper.classForName( tuplizerClassName );
return constructTuplizer( tuplizerClass, metamodel, persistentClass );
}
catch ( ClassNotFoundException e ) {
throw new HibernateException( "Could not locate specified tuplizer class [" + tuplizerClassName + "]" );
}
}
/**
* Construct an instance of the given tuplizer class.
*
* @param tuplizerClass The tuplizer class to instantiate
* @param metamodel The metadata for the entity.
* @param persistentClass The mapping info for the entity.
*
* @return The instantiated tuplizer
*
* @throws HibernateException if the {@link Constructor#newInstance} call fails.
*/
public EntityTuplizer constructTuplizer(
Class tuplizerClass,
EntityMetamodel metamodel,
PersistentClass persistentClass) {
Constructor ctor = getProperConstructor( tuplizerClass );
assert ctor != null : "Unable to locate proper constructor for tuplizer [" + tuplizerClass.getName() + "]";
try {
return ( EntityTuplizer ) ctor.newInstance( new Object[] { metamodel, persistentClass } );
}
catch ( Throwable t ) {
throw new HibernateException( "Unable to instantiate default tuplizer [" + tuplizerClass.getName() + "]", t );
}
}
/**
* Construct am instance of the default tuplizer for the given entity-mode.
*
* @param entityMode The entity mode for which to build a default tuplizer.
* @param metamodel The entity metadata.
* @param persistentClass The entity mapping info.
*
* @return The instantiated tuplizer
*
* @throws HibernateException If no default tuplizer found for that entity-mode; may be re-thrown from
* {@link #constructTuplizer} too.
*/
public EntityTuplizer constructDefaultTuplizer(
EntityMode entityMode,
EntityMetamodel metamodel,
PersistentClass persistentClass) {
Class tuplizerClass = ( Class ) defaultImplClassByMode.get( entityMode );
if ( tuplizerClass == null ) {
throw new HibernateException( "could not determine default tuplizer class to use [" + entityMode + "]" );
}
return constructTuplizer( tuplizerClass, metamodel, persistentClass );
}
private boolean isEntityTuplizerImplementor(Class tuplizerClass) {
return ReflectHelper.implementsInterface( tuplizerClass, EntityTuplizer.class );
}
private boolean hasProperConstructor(Class tuplizerClass) {
return getProperConstructor( tuplizerClass ) != null
&& ! ReflectHelper.isAbstractClass( tuplizerClass );
}
private Constructor getProperConstructor(Class clazz) {
Constructor ctor = null;
try {
ctor = clazz.getDeclaredConstructor( ENTITY_TUP_CTOR_SIG );
if ( ! ReflectHelper.isPublic( ctor ) ) {
try {
// found a ctor, but it was not publicly accessible so try to request accessibility
ctor.setAccessible( true );
}
catch ( SecurityException e ) {
ctor = null;
}
}
}
catch ( NoSuchMethodException ignore ) {
}
return ctor;
}
private static Map buildBaseMapping() {
Map map = new FastHashMap();
map.put( EntityMode.POJO, PojoEntityTuplizer.class );
map.put( EntityMode.DOM4J, Dom4jEntityTuplizer.class );
map.put( EntityMode.MAP, DynamicMapEntityTuplizer.class );
return map;
}
}
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