/*
 * The Apache Software License, Version 1.1
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 * 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:
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 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
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 *    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.
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 *    Foundation" must not be used to endorse or promote products derived
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 */ 

package org.apache.commons.el;

import javax.servlet.jsp.el.ELException;
import java.math.BigDecimal;

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

public class DivideOperator
  extends BinaryOperator
{
  //-------------------------------------
  // Singleton
  //-------------------------------------

  public static final DivideOperator SINGLETON =
    new DivideOperator ();

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

  //-------------------------------------
  // 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 == null &&
	pRight == null) {
      if (pLogger.isLoggingWarning ()) {
	pLogger.logWarning
	  (Constants.ARITH_OP_NULL,
	   getOperatorSymbol ());
      }
      return PrimitiveObjects.getInteger (0);
    }

    if (Coercions.isBigDecimal(pLeft) ||
        Coercions.isBigInteger(pLeft) ||
        Coercions.isBigDecimal(pRight) ||
        Coercions.isBigInteger(pRight)) {

        BigDecimal left = (BigDecimal)
            Coercions.coerceToPrimitiveNumber(pLeft, BigDecimal.class, pLogger);
        BigDecimal right = (BigDecimal)
            Coercions.coerceToPrimitiveNumber(pRight, BigDecimal.class, pLogger);

        try {
            return left.divide(right, BigDecimal.ROUND_HALF_UP);
        } catch (Exception exc) {
            if (pLogger.isLoggingError()) {
                pLogger.logError
                    (Constants.ARITH_ERROR,
                        getOperatorSymbol(),
                        "" + left,
                        "" + right);
            }
            return PrimitiveObjects.getInteger(0);
        }
    } else {

        double left =
            Coercions.coerceToPrimitiveNumber(pLeft, Double.class, pLogger).
            doubleValue();
        double right =
            Coercions.coerceToPrimitiveNumber(pRight, Double.class, pLogger).
            doubleValue();

        try {
            return PrimitiveObjects.getDouble(left / right);
        } catch (Exception exc) {
            if (pLogger.isLoggingError()) {
                pLogger.logError
                    (Constants.ARITH_ERROR,
                        getOperatorSymbol(),
                        "" + left,
                        "" + right);
            }
            return PrimitiveObjects.getInteger(0);
        }
    }
  }

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