Hibernate example source code file (MapEntryExpression.java)

This example Hibernate source code file (MapEntryExpression.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

criteriabuilderimpl, illegalstateexception, io, k, k, mapattribute, mapattribute, mapentryexpression, pathimplementor, renderable, serializable, string, string, util, v, v

The Hibernate MapEntryExpression.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.expression;
import java.io.Serializable;
import java.util.Map;
import javax.persistence.criteria.Expression;
import javax.persistence.metamodel.MapAttribute;
import org.hibernate.ejb.criteria.CriteriaBuilderImpl;
import org.hibernate.ejb.criteria.CriteriaQueryCompiler;
import org.hibernate.ejb.criteria.ParameterRegistry;
import org.hibernate.ejb.criteria.PathImplementor;
import org.hibernate.ejb.criteria.Renderable;

/**
 * TODO : javadoc
 *
 * @author Steve Ebersole
 */
public class MapEntryExpression<K,V>
		extends ExpressionImpl<Map.Entry
		implements Expression<Map.Entry, Serializable {

	private final PathImplementor origin;
	private final MapAttribute<?, K, V> attribute;

	public MapEntryExpression(
			CriteriaBuilderImpl criteriaBuilder,
			Class<Map.Entry javaType,
			PathImplementor origin,
			MapAttribute<?, K, V> attribute) {
		super( criteriaBuilder, javaType);
		this.origin = origin;
		this.attribute = attribute;
	}

	public MapAttribute<?, K, V> getAttribute() {
		return attribute;
	}

	public void registerParameters(ParameterRegistry registry) {
		// none to register
	}

	public String render(CriteriaQueryCompiler.RenderingContext renderingContext) {
		// don't think this is valid outside of select clause...
		throw new IllegalStateException( "illegal reference to map entry outside of select clause." );
	}

	public String renderProjection(CriteriaQueryCompiler.RenderingContext renderingContext) {
		return "entry(" + path( renderingContext ) + ")";
	}

	private String path(CriteriaQueryCompiler.RenderingContext renderingContext) {
		return origin.getPathIdentifier()
				+ '.'
				+ ( (Renderable) getAttribute() ).renderProjection( renderingContext );
	}
}