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/*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 1999 The Apache Software Foundation.  All rights 
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:  
 *       "This product includes software developed by the 
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written 
 *    permission, please contact [email protected].
 *
 * 5. Products derived from this software may not be called "Apache"
 *    nor may "Apache" appear in their names without prior written
 *    permission of the Apache Group.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * .
 *
 */ 

package org.jbpm.jpdl.el.impl;

import java.math.BigDecimal;
import java.math.BigInteger;

import org.jbpm.jpdl.el.ELException;

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

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

  public static final LessThanOrEqualsOperator SINGLETON =
    new LessThanOrEqualsOperator ();

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

  //-------------------------------------
  // 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,
		       Logger pLogger)
    throws ELException
  {
    if (pLeft == pRight) {
      return Boolean.TRUE;
    }
    else if (pLeft == null ||
	     pRight == null) {
      return Boolean.FALSE;
    }
    else {
      return super.apply (pLeft, pRight, pLogger);
    }
  }

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

  //-------------------------------------

    /**
     *
     * Applies the operator to the given BigDecimal values, returning a BigDecimal
     **/
    public boolean apply(BigDecimal pLeft, BigDecimal pRight) {
        return (isLess(pLeft.compareTo(pRight)) || isEqual(pLeft.compareTo(pRight)));
    }

    //-------------------------------------

    /**
     *
     * Applies the operator to the given BigDecimal values, returning a BigDecimal
     **/
    public boolean apply(BigInteger pLeft, BigInteger pRight) {
        return (isLess(pLeft.compareTo(pRight)) || isEqual(pLeft.compareTo(pRight)));
    }

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