/*
* 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.ejb.criteria.path;
import java.io.Serializable;
import javax.persistence.metamodel.Attribute;
import javax.persistence.metamodel.Bindable;
import javax.persistence.metamodel.EmbeddableType;
import javax.persistence.metamodel.IdentifiableType;
import javax.persistence.metamodel.ManagedType;
import javax.persistence.metamodel.SingularAttribute;
import org.hibernate.ejb.criteria.CriteriaBuilderImpl;
import org.hibernate.ejb.criteria.PathSource;
/**
* Models a path for a {@link SingularAttribute} generally obtained from a
* {@link javax.persistence.criteria.Path#get(SingularAttribute)} call
*
* @author Steve Ebersole
*/
public class SingularAttributePath<X> extends AbstractPathImpl<X> implements Serializable {
private final SingularAttribute<?,X> attribute;
private final ManagedType<X> managedType;
@SuppressWarnings({ "unchecked" })
public SingularAttributePath(
CriteriaBuilderImpl criteriaBuilder,
Class<X> javaType,
PathSource pathSource,
SingularAttribute<?, X> attribute) {
super( criteriaBuilder, javaType, pathSource );
this.attribute = attribute;
this.managedType = resolveManagedType( attribute );
}
private ManagedType<X> resolveManagedType(SingularAttribute<?, X> attribute) {
if ( Attribute.PersistentAttributeType.BASIC == attribute.getPersistentAttributeType() ) {
return null;
}
else if ( Attribute.PersistentAttributeType.EMBEDDED == attribute.getPersistentAttributeType() ) {
return (EmbeddableType<X>) attribute.getType();
}
else {
return (IdentifiableType<X>) attribute.getType();
// return criteriaBuilder.getEntityManagerFactory()
// .getMetamodel()
// .managedType( javaType );
}
}
/**
* {@inheritDoc}
*/
public SingularAttribute<?, X> getAttribute() {
return attribute;
}
/**
* {@inheritDoc}
*/
public Bindable<X> getModel() {
return getAttribute();
}
/**
* {@inheritDoc}
*/
@Override
protected boolean canBeDereferenced() {
return managedType != null;
}
@Override
protected Attribute locateAttributeInternal(String attributeName) {
final Attribute attribute = managedType.getAttribute( attributeName );
// ManagedType.locateAttribute should throw exception rather than return
// null, but just to be safe...
if ( attribute == null ) {
throw new IllegalArgumentException( "Could not resolve attribute named " + attributeName );
}
return attribute;
}
}