Hibernate example source code file (SingularAttributePath.java)

This example Hibernate source code file (SingularAttributePath.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Hibernate tags/keywords

attribute, attribute, could, criteriabuilderimpl, embeddabletype, illegalargumentexception, io, managedtype, override, singularattribute, singularattribute, singularattributepath, singularattributepath, x, x

The Hibernate SingularAttributePath.java source code

/*
 * 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 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 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;
	}
}