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 */
017 package org.apache.commons.el;
018
019 import javax.servlet.jsp.el.ELException;
020
021 import org.apache.commons.logging.Log;
022 import 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
032 public 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 }