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Java > Open Source Codes > com > opensymphony > workflow > query > Expression


1 /*
2  * Copyright (c) 2002-2003 by OpenSymphony
3  * All rights reserved.
4  */
5 package com.opensymphony.workflow.query;
6
7 import java.io.Serializable JavaDoc;
8
9
10 /**
11  * Abstract base class for expressions used in a workflow query.
12  * Expressions can be negate and/or nested. The default is not negate.
13  * <p></p>
14  * Expressions which are supported by all stores are {@link FieldExpression} and {@link NestedExpression}.
15  * <p></p>
16  * Store specific expressions like XPathExpression can be added.
17  *
18  * @author Christine Zimmermann
19  * @version $Revision: 1.7 $
20  */
21 public abstract class Expression implements Serializable JavaDoc {
22     //~ Instance fields ////////////////////////////////////////////////////////
23
24     protected boolean negate = false;
25
26     //~ Constructors ///////////////////////////////////////////////////////////
27
28     protected Expression() {
29     }
30
31     //~ Methods ////////////////////////////////////////////////////////////////
32
33     public boolean isNegate() {
34         return negate;
35     }
36
37     abstract public boolean isNested();
38 }
39
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