/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
 * 
 * Portions Copyright Apache Software Foundation.
 * 
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 * 
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
 * Sun designates this particular file as subject to the "Classpath" exception
 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
 * identifying information: "Portions Copyrighted [year]
 * [name of copyright owner]"
 * 
 * Contributor(s):
 * 
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

package org.apache.taglibs.standard.lang.jstl;

/**
 *
 * <p>The implementation of the less than operator
 * 
 * @author Nathan Abramson - Art Technology Group
 * @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: tcfujii $
 **/

public class LessThanOperator
  extends RelationalOperator
{
  //-------------------------------------
  // Singleton
  //-------------------------------------

  public static final LessThanOperator SINGLETON =
    new LessThanOperator ();

  //-------------------------------------
  /**
   *
   * Constructor
   **/
  public LessThanOperator ()
  {
  }

  //-------------------------------------
  // Expression methods
  //-------------------------------------
  /**
   *
   * Returns the symbol representing the operator
   **/
  public String getOperatorSymbol ()
  {
    return "<";
  }

  //-------------------------------------
  /**
   *
   * Applies the operator to the given value
   **/
  public Object apply (Object pLeft,
		       Object pRight,
		       Object pContext,
		       Logger pLogger)
    throws ELException
  {
    if (pLeft == pRight) {
      return Boolean.FALSE;
    }
    else if (pLeft == null ||
	     pRight == null) {
      return Boolean.FALSE;
    }
    else {
      return super.apply (pLeft, pRight, pContext, pLogger);
    }
  }

  //-------------------------------------
  /**
   *
   * Applies the operator to the given double values
   **/
  public boolean apply (double pLeft,
			double pRight,
			Logger pLogger)
  {
    return pLeft < pRight;
  }
  
  //-------------------------------------
  /**
   *
   * Applies the operator to the given long values
   **/
  public boolean apply (long pLeft,
			long pRight,
			Logger pLogger)
  {
    return pLeft < pRight;
  }
  
  //-------------------------------------
  /**
   *
   * Applies the operator to the given String values
   **/
  public boolean apply (String pLeft,
			String pRight,
			Logger pLogger)
  {
    return pLeft.compareTo (pRight) < 0;
  }

  //-------------------------------------
}
