/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later.
* See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
*/
package org.hibernate.query.criteria.internal.path;
import java.io.Serializable;
import java.util.Collection;
import javax.persistence.criteria.Expression;
import javax.persistence.criteria.JoinType;
import javax.persistence.criteria.Predicate;
import javax.persistence.metamodel.CollectionAttribute;
import javax.persistence.metamodel.ManagedType;
import org.hibernate.query.criteria.internal.CollectionJoinImplementor;
import org.hibernate.query.criteria.internal.CriteriaBuilderImpl;
import org.hibernate.query.criteria.internal.CriteriaSubqueryImpl;
import org.hibernate.query.criteria.internal.FromImplementor;
import org.hibernate.query.criteria.internal.PathImplementor;
import org.hibernate.query.criteria.internal.PathSource;
import org.hibernate.query.criteria.internal.compile.RenderingContext;
/**
* Models a join based on a plural association attribute.
*
* @author Steve Ebersole
*/
public class CollectionAttributeJoin<O,E>
extends PluralAttributeJoinSupport<O,Collection<E>,E>
implements CollectionJoinImplementor<O,E>, Serializable {
public CollectionAttributeJoin(
CriteriaBuilderImpl criteriaBuilder,
Class<E> javaType,
PathSource<O> pathSource,
CollectionAttribute<? super O, E> joinAttribute,
JoinType joinType) {
super( criteriaBuilder, javaType, pathSource, joinAttribute, joinType );
}
public final CollectionAttributeJoin<O,E> correlateTo(CriteriaSubqueryImpl subquery) {
return (CollectionAttributeJoin<O,E>) super.correlateTo( subquery );
}
@Override
public CollectionAttribute<? super O, E> getAttribute() {
return (CollectionAttribute<? super O, E>) super.getAttribute();
}
@Override
public CollectionAttribute<? super O, E> getModel() {
return getAttribute();
}
@Override
protected FromImplementor<O, E> createCorrelationDelegate() {
return new CollectionAttributeJoin<O,E>(
criteriaBuilder(),
getJavaType(),
(PathImplementor<O>) getParentPath(),
getAttribute(),
getJoinType()
);
}
@Override
public CollectionAttributeJoin<O, E> on(Predicate... restrictions) {
return (CollectionAttributeJoin<O,E>) super.on( restrictions );
}
@Override
public CollectionAttributeJoin<O, E> on(Expression<Boolean> restriction) {
return (CollectionAttributeJoin<O,E>) super.on( restriction );
}
@Override
public <T extends E> CollectionAttributeJoin<O,T> treatAs(Class<T> treatAsType) {
return new TreatedCollectionAttributeJoin<O,T>( this, treatAsType );
}
public static class TreatedCollectionAttributeJoin<O,T> extends CollectionAttributeJoin<O, T> {
private final CollectionAttributeJoin<O, ? super T> original;
private final Class<T> treatAsType;
@SuppressWarnings("unchecked")
public TreatedCollectionAttributeJoin(CollectionAttributeJoin<O, ? super T> original, Class<T> treatAsType) {
super(
original.criteriaBuilder(),
treatAsType,
original.getPathSource(),
(CollectionAttribute<? super O, T>) original.getAttribute(),
original.getJoinType()
);
this.original = original;
this.treatAsType = treatAsType;
}
@Override
public String getAlias() {
return isCorrelated() ? getCorrelationParent().getAlias() : super.getAlias();
}
@Override
public void prepareAlias(RenderingContext renderingContext) {
if ( getAlias() == null ) {
if ( isCorrelated() ) {
setAlias( getCorrelationParent().getAlias() );
}
else {
setAlias( renderingContext.generateAlias() );
}
}
}
@Override
protected void setAlias(String alias) {
super.setAlias( alias );
original.setAlias( alias );
}
@Override
public String render(RenderingContext renderingContext) {
return "treat(" + original.render( renderingContext ) + " as " + treatAsType.getName() + ")";
}
@Override
protected ManagedType<T> locateManagedType() {
return criteriaBuilder().getEntityManagerFactory().getMetamodel().managedType( treatAsType );
}
@Override
public String getPathIdentifier() {
return "treat(" + getAlias() + " as " + treatAsType.getName() + ")";
}
@Override
protected PathSource getPathSourceForSubPaths() {
return this;
}
}
}