/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2010, Red Hat Inc. 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 Inc.
*
* 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.cfg.beanvalidation;
import java.lang.annotation.ElementType;
import java.util.Set;
import java.util.HashSet;
import java.util.concurrent.ConcurrentHashMap;
import javax.validation.TraversableResolver;
import javax.validation.Path;
import org.hibernate.persister.entity.EntityPersister;
import org.hibernate.Hibernate;
import org.hibernate.annotations.common.AssertionFailure;
import org.hibernate.engine.SessionFactoryImplementor;
import org.hibernate.type.CompositeType;
import org.hibernate.type.Type;
import org.hibernate.type.CollectionType;
/**
* Use Hibernate metadata to ignore cascade on entities.
* cascade on embeddable objects or collection of embeddable objects are accepted
*
* Also use Hibernate's native isInitialized method call.
*
* @author Emmanuel Bernard
*/
public class HibernateTraversableResolver implements TraversableResolver {
private Set<String> associations;
public HibernateTraversableResolver(
EntityPersister persister,
ConcurrentHashMap<EntityPersister, Set<String>> associationsPerEntityPersister,
SessionFactoryImplementor factory) {
this.associations = associationsPerEntityPersister.get( persister );
if (this.associations == null) {
this.associations = new HashSet<String>();
addAssociationsToTheSetForAllProperties( persister.getPropertyNames(), persister.getPropertyTypes(), "", factory );
associationsPerEntityPersister.put( persister, associations );
}
}
private void addAssociationsToTheSetForAllProperties(String[] names, Type[] types, String prefix, SessionFactoryImplementor factory) {
final int length = names.length;
for( int index = 0 ; index < length; index++ ) {
addAssociationsToTheSetForOneProperty( names[index], types[index], prefix, factory );
}
}
private void addAssociationsToTheSetForOneProperty(String name, Type type, String prefix, SessionFactoryImplementor factory) {
if ( type.isCollectionType() ) {
CollectionType collType = (CollectionType) type;
Type assocType = collType.getElementType( factory );
addAssociationsToTheSetForOneProperty(name, assocType, prefix, factory);
}
//ToOne association
else if ( type.isEntityType() || type.isAnyType() ) {
associations.add( prefix + name );
} else if ( type.isComponentType() ) {
CompositeType componentType = (CompositeType) type;
addAssociationsToTheSetForAllProperties(
componentType.getPropertyNames(),
componentType.getSubtypes(),
(prefix.equals( "" ) ? name : prefix + name) + ".",
factory);
}
}
private String getStringBasedPath(Path.Node traversableProperty, Path pathToTraversableObject) {
StringBuilder path = new StringBuilder( );
for ( Path.Node node : pathToTraversableObject ) {
if (node.getName() != null) {
path.append( node.getName() ).append( "." );
}
}
if ( traversableProperty.getName() == null ) {
throw new AssertionFailure(
"TraversableResolver being passed a traversableProperty with null name. pathToTraversableObject: "
+ path.toString() );
}
path.append( traversableProperty.getName() );
return path.toString();
}
public boolean isReachable(Object traversableObject,
Path.Node traversableProperty,
Class<?> rootBeanType,
Path pathToTraversableObject,
ElementType elementType) {
//lazy, don't load
return Hibernate.isInitialized( traversableObject )
&& Hibernate.isPropertyInitialized( traversableObject, traversableProperty.getName() );
}
public boolean isCascadable(Object traversableObject,
Path.Node traversableProperty,
Class<?> rootBeanType,
Path pathToTraversableObject,
ElementType elementType) {
String path = getStringBasedPath( traversableProperty, pathToTraversableObject );
return ! associations.contains(path);
}
}