Hibernate example source code file (JavaConstantNode.java)

This example Hibernate source code file (JavaConstantNode.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

dialect, expectedtypeawarenode, javaconstantnode, literaltype, literaltype, object, override, override, sessionfactoryawarenode, string, string, throwable, type, type

The Hibernate JavaConstantNode.java source code

/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2008, Red Hat Middleware LLC 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 Middleware LLC.
 *
 * 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.hql.internal.ast.tree;

import org.hibernate.QueryException;
import org.hibernate.dialect.Dialect;
import org.hibernate.engine.spi.SessionFactoryImplementor;
import org.hibernate.hql.spi.QueryTranslator;
import org.hibernate.internal.util.ReflectHelper;
import org.hibernate.internal.util.StringHelper;
import org.hibernate.type.LiteralType;
import org.hibernate.type.Type;

/**
 * A node representing a static Java constant.
 *
 * @author Steve Ebersole
 */
public class JavaConstantNode extends Node implements ExpectedTypeAwareNode, SessionFactoryAwareNode {

	private SessionFactoryImplementor factory;

	private String constantExpression;
	private Object constantValue;
	private Type heuristicType;

	private Type expectedType;

	@Override
    public void setText(String s) {
		// for some reason the antlr.CommonAST initialization routines force
		// this method to get called twice.  The first time with an empty string
		if ( StringHelper.isNotEmpty( s ) ) {
			constantExpression = s;
			constantValue = ReflectHelper.getConstantValue( s );
			heuristicType = factory.getTypeResolver().heuristicType( constantValue.getClass().getName() );
			super.setText( s );
		}
	}

	public void setExpectedType(Type expectedType) {
		this.expectedType = expectedType;
	}

	public Type getExpectedType() {
		return expectedType;
	}

	public void setSessionFactory(SessionFactoryImplementor factory) {
		this.factory = factory;
	}

	@Override
    public String getRenderText(SessionFactoryImplementor sessionFactory) {
		Type type = expectedType == null
				? heuristicType
				: Number.class.isAssignableFrom( heuristicType.getReturnedClass() )
						? heuristicType
						: expectedType;
		try {
			LiteralType literalType = ( LiteralType ) type;
			Dialect dialect = factory.getDialect();
			return literalType.objectToSQLString( constantValue, dialect );
		}
		catch ( Throwable t ) {
			throw new QueryException( QueryTranslator.ERROR_CANNOT_FORMAT_LITERAL + constantExpression, t );
		}
	}
}