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 *
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 * Copyright 2000-2001,2003 (C) Exoffice Technologies Inc. All Rights Reserved.
 */

package org.exolab.jms.selector;


/**
 * This class implements a '<' expression.
 *
 * @version     $Revision: 1.1 $ $Date: 2004/11/26 01:50:44 $
 * @author      <a href="mailto:tma@netspace.net.au">Tim Anderson</a>
 * @see         Expression
 * @see         LogicalOperator
 * @see         SBool
 */
class Less extends LogicalOperator {

    /**
     * Construct a new <code>Less</code> operator
     *
     * @param lhs the left hand side of the expression
     * @param rhs the right hand side of the expression
     */
    public Less(final Expression lhs, final Expression rhs) {
        super("<", lhs, rhs);
    }

    /**
     * Evaluates the expression
     *
     * @param lhs the left hand side of the expression
     * @param rhs the right hand side of the expression
     * @return <code>SBool.TRUE</code> if <code>lhs &lt; rhs</code>,
     * <code>SBool.FALSE</code> if <code>lhs &gt;= rhs</code>, or
     * <code>null</code> if the comparison is undefined
     */
    protected final SBool evaluate(final SObject lhs, final SObject rhs) {
        return lhs.less(rhs);
    }

} //-- Less