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Hibernate's core ORM functionality

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/*
 * 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 .
 */
package org.hibernate.query.criteria.internal.path;

import javax.persistence.criteria.Expression;
import javax.persistence.criteria.JoinType;
import javax.persistence.criteria.PluralJoin;
import javax.persistence.criteria.Predicate;
import javax.persistence.metamodel.Attribute;
import javax.persistence.metamodel.ManagedType;
import javax.persistence.metamodel.PluralAttribute;
import javax.persistence.metamodel.Type;

import org.hibernate.query.criteria.internal.CriteriaBuilderImpl;
import org.hibernate.query.criteria.internal.JoinImplementor;
import org.hibernate.query.criteria.internal.PathSource;

/**
 * Support for defining joins to plural attributes (JPA requires typing based on
 * the specific collection type so we cannot really implement all support in a
 * single class)
 *
 * @author Steve Ebersole
 */
public abstract class PluralAttributeJoinSupport
		extends AbstractJoinImpl
		implements PluralJoin {

	public PluralAttributeJoinSupport(
			CriteriaBuilderImpl criteriaBuilder,
			Class javaType,
			PathSource pathSource,
			Attribute joinAttribute,
			JoinType joinType) {
		super( criteriaBuilder, javaType, pathSource, joinAttribute, joinType );
	}

	@Override
	public PluralAttribute getAttribute() {
		return (PluralAttribute) super.getAttribute();
	}

	public PluralAttribute getModel() {
		return getAttribute();
	}

	@Override
	protected ManagedType locateManagedType() {
		return isBasicCollection()
				? null
				: (ManagedType) getAttribute().getElementType();
	}

	public boolean isBasicCollection() {
		return Type.PersistenceType.BASIC.equals( getAttribute().getElementType().getPersistenceType() );
	}

	@Override
	protected boolean canBeDereferenced() {
		return !isBasicCollection();
	}

	@Override
	protected boolean canBeJoinSource() {
		return !isBasicCollection();
	}

	@Override
	public JoinImplementor on(Predicate... restrictions) {
		return super.on( restrictions );
	}

	@Override
	public JoinImplementor on(Expression restriction) {
		return super.on( restriction );
	}
}