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The core O/RM functionality as provided by Hibernate

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/*
 * 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.dialect.function;
import java.util.List;

import org.hibernate.QueryException;
import org.hibernate.engine.spi.Mapping;
import org.hibernate.engine.spi.SessionFactoryImplementor;
import org.hibernate.type.StandardBasicTypes;
import org.hibernate.type.Type;

/**
 * A Caché defintion of a convert function.
 *
 * @author Jonathan Levinson
 */
public class ConvertFunction implements SQLFunction {
	@Override
	public boolean hasArguments() {
		return true;
	}

	@Override
	public boolean hasParenthesesIfNoArguments() {
		return true;
	}

	@Override
	public Type getReturnType(Type firstArgumentType, Mapping mapping) throws QueryException {
		return StandardBasicTypes.STRING;
	}

	@Override
	public String render(Type firstArgumentType, List args, SessionFactoryImplementor factory) throws QueryException {
		if ( args.size() != 2 && args.size() != 3 ) {
			throw new QueryException( "convert() requires two or three arguments" );
		}

		final String type = (String) args.get( 1 );

		if ( args.size() == 2 ) {
			return "{fn convert(" + args.get( 0 ) + " , " + type + ")}";
		}
		else {
			return "convert(" + args.get( 0 ) + " , " + type + "," + args.get( 2 ) + ")";
		}
	}

}