FieldValueOperation


1   package org.jicengine.operation;
2   
3   
4   /**
5    *
6    * <p>
7    * Copyright (C) 2004  Timo Laitinen
8    * </p>
9    * @author    .timo
10   */
11  
12  public class FieldValueOperation implements Operation {
13  
14    
15      private Operation actor;
16      private String   field;
17      private String   signature;
18  
19      public FieldValueOperation(String   signature, Operation actor, String   field)
20      {
21          this.signature = signature;
22          this.actor = actor;
23          this.field = field;
24      }
25  
26      public boolean needsParameters()
27      {
28          return this.actor.needsParameters();
29      }
30  
31      public boolean needsParameter(String   name)
32      {
33          return this.actor.needsParameter(name);
34      }
35  
36      public Object   execute(Context context) throws OperationException
37      {
38          Object   actorObject = this.actor.execute(context);
39  
40          try {
41              if( actorObject instanceof Class   ){
42                  // invoke a static method.
43         return ReflectionUtils.getFieldValue(null, (Class  )actorObject, this.field);  
44              }
45              else {
46                  // invoke a method of the actor-instance.
47                  return ReflectionUtils.getFieldValue(actorObject, actorObject.getClass(), this.field);
48              }
49          } catch (java.lang.reflect.InvocationTargetException   e){
50              // InvocationTargetException means that the invoked method threw an exception
51              // catch it and throw a CDLElementException that has the correct application-exception..
52              throw new OperationException("'" + toString() + "' resulted in exception", e.getTargetException());
53          } catch (Exception   e2){
54              throw new OperationException("'" + toString() + "': " + e2.getMessage(), e2);
55          }
56      }
57  
58      public String   toString()
59      {
60          return this.signature;
61      }
62  }
63
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