IsEventFrom


1   /** Created on Jun 28, 2002 by npryce
2    *  Copyright (c) B13media Ltd.
3    */
4   package com.mockobjects.constraint;
5   
6   import java.util.EventObject  ;
7   
8   
9   /** Tests if the value is an event announced by a specific object.
10   */
11  public class IsEventFrom
12      implements Constraint
13  {
14      private Class   _event_class;
15      private Object   _source;
16      
17      /** Constructs an IsEventFrom predicate that returns true for any object 
18       *  derived from {@link java.util.EventObject} announced by
19       *  <var>source</var>.
20       */
21      public IsEventFrom( Object   source ) {
22          this( EventObject  .class, source );
23      }
24      
25      /** Constructs an IsEventFrom predicate that returns true for any object 
26       *  derived from <var>event_class</var> announced by 
27       *  <var>source</var>.
28       */
29      public IsEventFrom( Class   event_class, Object   source ) {
30          _event_class = event_class;
31          _source = source;
32      }
33      
34      public boolean eval( Object   o ) {
35          if( o instanceof EventObject   ) {
36              EventObject   ev = (EventObject  )o;
37              return _event_class.isInstance(o) && ev.getSource() == _source; 
38              
39          } else {
40              return false;
41          }
42      }
43      
44      public String   toString() {
45          return "an event of type " + _event_class.getName() + 
46                 " from " + _source;
47      }
48  }
49

A to Z: JavaDoc & Examples Daily Java News & Articles Open Source Projects Open Source Codes Free Computer Books Remove Frame

Popular Tags