001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *     http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.commons.el;
018
019import javax.servlet.jsp.el.ELException;
020
021import org.apache.commons.logging.Log;
022import org.apache.commons.logging.LogFactory;
023
024/**
025 *
026 * <p>The implementation of the integer divide operator
027 * 
028 * @author Nathan Abramson - Art Technology Group
029 * @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: bayard $
030 **/
031
032public class IntegerDivideOperator
033  extends BinaryOperator
034{
035    //-------------------------------------
036    // Constants
037    //-------------------------------------
038    private static Log log = LogFactory.getLog(IntegerDivideOperator.class);
039    
040  //-------------------------------------
041  // Singleton
042  //-------------------------------------
043
044  public static final IntegerDivideOperator SINGLETON =
045    new IntegerDivideOperator ();
046
047  //-------------------------------------
048  /**
049   *
050   * Constructor
051   **/
052  public IntegerDivideOperator ()
053  {
054  }
055
056  //-------------------------------------
057  // Expression methods
058  //-------------------------------------
059  /**
060   *
061   * Returns the symbol representing the operator
062   **/
063  public String getOperatorSymbol ()
064  {
065    return "idiv";
066  }
067
068  //-------------------------------------
069  /**
070   *
071   * Applies the operator to the given value
072   **/
073  public Object apply (Object pLeft, Object pRight)
074    throws ELException
075  {
076    if (pLeft == null &&
077        pRight == null) {
078        if (log.isWarnEnabled()) {
079            log.warn(
080                MessageUtil.getMessageWithArgs(
081                    Constants.ARITH_OP_NULL, 
082                    getOperatorSymbol()));
083        }     
084      return PrimitiveObjects.getInteger (0);
085    }
086
087    long left =
088      Coercions.coerceToPrimitiveNumber (pLeft, Long.class).
089      longValue ();
090    long right =
091      Coercions.coerceToPrimitiveNumber (pRight, Long.class).
092      longValue ();
093
094    try {
095      return PrimitiveObjects.getLong (left / right);
096    }
097    catch (Exception exc) {
098        if (log.isErrorEnabled()) {
099            String message = MessageUtil.getMessageWithArgs(
100                Constants.ARITH_ERROR,
101                getOperatorSymbol(),
102                "" + left,
103                "" + right);
104            log.error(message);
105        }    
106      return PrimitiveObjects.getInteger (0);
107    }
108  }
109
110  //-------------------------------------
111}