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 /**
022 *
023 * <p>This is the superclass for all unary operators
024 *
025 * @author Nathan Abramson - Art Technology Group
026 * @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: bayard $
027 **/
028
029 public abstract class UnaryOperator
030 {
031 //-------------------------------------
032 /**
033 *
034 * Constructor
035 **/
036 public UnaryOperator ()
037 {
038 }
039
040 //-------------------------------------
041 // Expression methods
042 //-------------------------------------
043 /**
044 *
045 * Returns the symbol representing the operator
046 **/
047 public abstract String getOperatorSymbol ();
048
049 //-------------------------------------
050 /**
051 *
052 * Applies the operator to the given value
053 **/
054 public abstract Object apply (Object pValue)
055 throws ELException;
056
057 //-------------------------------------
058 }