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1 package org.jicengine.operation;
2
3 import java.util.List  ;
4 import java.util.ArrayList ;
5
6
15
16 public abstract class InvocationOperation implements Operation {
17
18 Operation actor;
19 Operation[] parameters;
20
21 String signature;
22
23 public InvocationOperation(String signature, Operation actor, Operation[] parameters)
24 {
25 this.actor = actor;
26 this.parameters = parameters;
27 this.signature = signature;
28 }
29
30 public boolean needsParameters()
31 {
32 return this.parameters.length > 0;
33 }
34
35 public boolean needsParameter(String name)
36 {
37 if( this.actor.needsParameter(name) ){
38 return true;
39 }
40
41 for (int i = 0; i < this.parameters.length; i++) {
42 if( this.parameters[i].needsParameter(name) ){
43 return true;
44 }
45 }
46
47 return false;
48 }
49
50 public Object execute(Context context) throws OperationException
51 {
52 Object actorObject = this.actor.execute(context);
53 Object [] arguments = evaluateParameters(this.parameters, context);
54 return execute(actorObject, arguments);
55 }
56
57 public String toString()
58 {
59 return this.signature;
60 }
61
62 protected abstract Object execute(Object actor, Object [] arguments) throws OperationException;
63
64 public static Object [] evaluateParameters(Operation[] parameters, Context context) throws OperationException
65 {
66 Object [] params = new Object [parameters.length];
67 for (int i = 0; i < parameters.length; i++) {
68 params[i] = parameters[i].execute(context);
69 }
70 return params;
71 }
72
73 }
74
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