BinaryPredicateNut


1   package jfun.yan.xml.nuts.optional;
2   
3   import jfun.yan.Component;
4   import jfun.yan.Map2;
5   import jfun.yan.Monad;
6   
7   /**
8    * Super class for any tag that compares two objects.
9    * The result is a Component that yields the boolean comparison result.
10   * <p>
11   * @author Ben Yu
12   * Nov 11, 2005 3:41:47 PM
13   */
14  public abstract class BinaryPredicateNut extends BinaryNut {
15    /**
16     * The predicate.
17     * @param v1 the first value.
18     * @param v2 the second value.
19     */
20    public abstract boolean predicate(Object   v1, Object   v2);
21    public Component eval(){
22      if(!isVal1Set() || !isVal2Set())
23        throw raise("both values should be set for comparison.");
24      //return Components.value(predicate(getVal1(), getVal2()));
25      
26      final Map2 cmp = new Map2(){
27        public Object   map(Object   o1, Object   o2){
28          return Boolean.valueOf(predicate(o1, o2));
29        }
30      };
31      final Component c1 = getComponent1();
32      final Component c2 = getComponent2();
33      return Monad.map(c1, c2, cmp).cast(boolean.class);
34    }
35  }
36

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