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Java > Open Source Codes > prefuse > data > expression > NotPredicate


1 package prefuse.data.expression;
2
3 import prefuse.data.Tuple;
4
5 /**
6  * Predicate representing the negation of another predicate.
7  *
8  * @author <a HREF="http://jheer.org">jeffrey heer</a>
9  */
10 public class NotPredicate extends AbstractPredicate {
11
12     private Predicate m_predicate;
13     
14     /**
15      * Create a new NotPredicate.
16      * @param p the predicate to negate
17      */
18     public NotPredicate(Predicate p) {
19         m_predicate = p;
20     }
21     
22     /**
23      * Get the negated predicate.
24      * @return the negated predicate
25      */
26     public Predicate getPredicate() {
27         return m_predicate;
28     }
29     
30     /**
31      * @see prefuse.data.expression.Expression#getBoolean(prefuse.data.Tuple)
32      */
33     public boolean getBoolean(Tuple t) {
34         return !m_predicate.getBoolean(t);
35     }
36
37     /**
38      * @see prefuse.data.expression.Expression#visit(prefuse.data.expression.ExpressionVisitor)
39      */
40     public void visit(ExpressionVisitor v) {
41         v.visitExpression(this);
42         v.down();
43         m_predicate.visit(v);
44         v.up();
45     }
46     
47     /**
48      * @see java.lang.Object#toString()
49      */
50     public String JavaDoc toString() {
51         return "NOT "+m_predicate.toString();
52     }
53     
54     /**
55      * @see prefuse.data.expression.AbstractExpression#addChildListeners()
56      */
57     protected void addChildListeners() {
58         m_predicate.addExpressionListener(this);
59     }
60     
61     /**
62      * @see prefuse.data.expression.AbstractExpression#removeChildListeners()
63      */
64     protected void removeChildListeners() {
65         m_predicate.removeExpressionListener(this);
66     }
67     
68 } // end of class NotPredicate
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