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1 package org.objectweb.modfact.qvt.engine;
2
3 import javax.jmi.reflect.*;
4 import org.objectweb.modfact.qvt.util.RulePrinter;
5 import java.util.*;
6
7 class RuleBinding {
8
9 static boolean verbose = false;
10
11 Hashtable bindingTable;
12
13 RefObject rule;
14 Hashtable args;
15 RefPackage src;
16 RefPackage target;
17
18 int indent;
19
20 Object  returnVal = null;
21 ExpEvaluator evaluator;
22 String key;
23
24 RuleBinding(
25 Hashtable bindingTable
26 ,RefObject rule, RefPackage src, RefPackage target
27 ,Hashtable args, int indent) {
28
29 this.bindingTable = bindingTable;
30 this.rule = rule;
31 this.args = args;
32 this.src = src;
33 this.target = target;
34 this.indent = indent;
35 }
36
37 boolean isApplied() {
39 key = key + "rule=" + rule.refGetValue("name")
40 +",context=" +getId(args.get("context"));
41 if(rule.refMetaObject().refGetValue("name").equals("CalledRule")) {
42 Iterator it = ((List)rule.refGetValue("params")).iterator();
43 while(it.hasNext()) {
44 String argName = (String )((RefObject)it.next()).refGetValue("name");
45 Object arg = args.get(argName);
46 key = key +"," + argName +"="+ getId(arg);
47 }
48 }
49 if(!bindingTable.containsKey(key)) {
50 bindingTable.put(key,this);
51 return false;
52 }
53 return true;
54 }
55
56 String getId(Object o) {
57 if(o==null) return "null";
58 if(o instanceof RefObject)
59 return ((RefObject)o).refMofId();
60 return "" +o;
61 }
62
63 Object execute() throws Exception {
64 if(verbose) System.err.println( RulePrinter.printer.doIndent(indent) +"rule binding: " + rule.refGetValue("name"));
65
66 if(isApplied()) {
67 if(verbose) System.err.println( RulePrinter.printer.doIndent(indent+1) +"already applied to this context ->skip");
68 RuleBinding b = (RuleBinding)bindingTable.get(key);
69 return b.returnVal;
70 }
71
72 Object result = createResult(rule);
73
74 RefObject[] statements = (RefObject[]) ((Collection)rule.refGetValue("statements")).toArray(new RefObject[0]);
75
76 evaluator = new ExpEvaluator(this);
77
78 for(int i = 0; i<statements.length; i++) {
79 if(verbose) System.err.println( RulePrinter.printer.doIndent(indent+1)
80 +(i+1) + ": " +RulePrinter.printer.printShort(statements[i]) );
82 try {
83 evaluator.eval(statements[i]);
84 } catch(Exception e) {
85 if(verbose) System.err.println( RulePrinter.printer.doIndent(indent)
86 +"ERROR at " +rule.refGetValue("name") +" " +(i+1)
87 +": " + RulePrinter.printer.printShort(statements[i]) );
88 throw e;
89 }
90 }
91 RefObject returnValExp = (Reflection.isOfType(rule,"CalledRule"))? (RefObject)rule.refGetValue("returnVal") : null;
92
93 if(returnValExp!=null) {
94 try {
95 if(verbose) System.err.println( RulePrinter.printer.doIndent(indent+1)
96 +"return: " + RulePrinter.printer.printShort(returnValExp) );
98 returnVal = evaluator.eval(returnValExp);
99 } catch(Exception e) {
100 if(verbose) System.err.println( RulePrinter.printer.doIndent(indent)
101 +"ERROR at " +rule.refGetValue("name")
102 +": could not evaluate returned value" );
103 throw e;
104 }
105 }
106
107 if(verbose) System.err.println( RulePrinter.printer.doIndent(indent)
108 +"end rule: " +rule.refGetValue("name")
109 );
110 return returnVal;
111 }
112
113
114 Object createResult(RefObject rule) throws Exception {
116 String resultString = (String )rule.refGetValue("resultType");
117 if(resultString==null || resultString.equals("")) {
118 return null;
119 }
120 Object result = Reflection.createObject(
121 target
122 , resultString
123 );
124 args.put("result",result);
125 return result;
126 }
127
128 }
129 |
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