ValidatedPredicate


1   package prefuse.visual.expression;
2   
3   import prefuse.data.expression.ColumnExpression;
4   import prefuse.data.expression.Expression;
5   import prefuse.data.expression.Function;
6   import prefuse.data.expression.NotPredicate;
7   import prefuse.data.expression.Predicate;
8   import prefuse.visual.VisualItem;
9   
10  /**
11   * Expression that indicates if an item's validated flag is set.
12   * 
13   * @author <a HREF="http://jheer.org">jeffrey heer</a>
14   */
15  public class ValidatedPredicate extends ColumnExpression
16      implements Predicate, Function
17  {
18      /** Convenience instance for the validated == true case. */
19      public static final Predicate TRUE = new ValidatedPredicate();
20      /** Convenience instance for the validated == false case. */
21      public static final Predicate FALSE = new NotPredicate(TRUE);
22      
23      /**
24       * Create a new ValidatedPredicate.
25       */
26      public ValidatedPredicate() {
27          super(VisualItem.VALIDATED);
28      }
29      
30      /**
31       * @see prefuse.data.expression.Function#getName()
32       */
33      public String   getName() {
34          return "VALIDATED";
35      }
36  
37      /**
38       * @see prefuse.data.expression.Function#addParameter(prefuse.data.expression.Expression)
39       */
40      public void addParameter(Expression e) {
41          throw new IllegalStateException  ("This function takes 0 parameters");
42      }
43  
44      /**
45       * @see prefuse.data.expression.Function#getParameterCount()
46       */
47      public int getParameterCount() {
48          return 0;
49      }
50      
51      /**
52       * @see java.lang.Object#toString()
53       */
54      public String   toString() {
55          return getName()+"()";
56      }
57  
58  } // end of class ValidatedPredicate
59
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