01: /*
02: * The Apache Software License, Version 1.1
03: *
04: * Copyright (c) 1999 The Apache Software Foundation. All rights
05: * reserved.
06: *
07: * Redistribution and use in source and binary forms, with or without
08: * modification, are permitted provided that the following conditions
09: * are met:
10: *
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: *
14: * 2. Redistributions in binary form must reproduce the above copyright
15: * notice, this list of conditions and the following disclaimer in
16: * the documentation and/or other materials provided with the
17: * distribution.
18: *
19: * 3. The end-user documentation included with the redistribution, if
20: * any, must include the following acknowlegement:
21: * "This product includes software developed by the
22: * Apache Software Foundation (http://www.apache.org/)."
23: * Alternately, this acknowlegement may appear in the software itself,
24: * if and wherever such third-party acknowlegements normally appear.
25: *
26: * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
27: * Foundation" must not be used to endorse or promote products derived
28: * from this software without prior written permission. For written
29: * permission, please contact apache@apache.org.
30: *
31: * 5. Products derived from this software may not be called "Apache"
32: * nor may "Apache" appear in their names without prior written
33: * permission of the Apache Group.
34: *
35: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
36: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
37: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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43: * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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45: * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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49: * This software consists of voluntary contributions made by many
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54: */
55:
56: package org.jbpm.jpdl.el.impl;
57:
58: import org.jbpm.jpdl.el.ELException;
59:
60: /**
61: *
62: * <p>This is the superclass for all unary operators
63: *
64: * @author Nathan Abramson - Art Technology Group
65: * @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author$
66: **/
67:
68: public abstract class UnaryOperator {
69: //-------------------------------------
70: /**
71: *
72: * Constructor
73: **/
74: public UnaryOperator() {
75: }
76:
77: //-------------------------------------
78: // Expression methods
79: //-------------------------------------
80: /**
81: *
82: * Returns the symbol representing the operator
83: **/
84: public abstract String getOperatorSymbol();
85:
86: //-------------------------------------
87: /**
88: *
89: * Applies the operator to the given value
90: **/
91: public abstract Object apply(Object pValue, Logger pLogger)
92: throws ELException;
93:
94: //-------------------------------------
95: }
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