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1
23
24 package org.objectweb.fractal.adl.arguments;
25
26 import java.util.HashMap  ;
27 import java.util.Iterator ;
28 import java.util.Map ;
29 import java.util.StringTokenizer ;
30
31 import org.objectweb.fractal.adl.ADLException;
32 import org.objectweb.fractal.adl.AbstractLoader;
33 import org.objectweb.fractal.adl.Definition;
34 import org.objectweb.fractal.adl.Node;
35
36 public class ArgumentLoader extends AbstractLoader {
37
38
42 public Definition load (final String name, final Map context)
43 throws ADLException
44 {
45 Definition d = clientLoader.load(name, context);
46 Map values = new HashMap ();
47 if (d instanceof ArgumentDefinition) {
48 String args = ((ArgumentDefinition)d).getArguments();
49 if (args != null) {
50 StringTokenizer st = new StringTokenizer (args, ",");
51 int i = 0;
52 while (st.hasMoreTokens()) {
53 String arg = st.nextToken();
54 Object value = context.get(arg);
55 if (value == null) {
56 value = context.get(" arg " + i);
57 }
58 if (value == null) {
59 throw new ADLException(
60 "No value defined for argument '" + arg + "'", (Node)d, null);
61 }
62 values.put(arg, value);
63 ++i;
64 }
65 ((ArgumentDefinition)d).setArguments(null);
66 }
67 }
68 evaluate((Node)d, values);
69 return d;
70 }
71
72
76 void evaluate (final Node node, final Map context)
77 throws ADLException
78 {
79 Map attrs = node.astGetAttributes();
80 Iterator i = attrs.keySet().iterator();
81 while (i.hasNext()) {
82 String attr = (String )i.next();
83 String value = (String )attrs.get(attr);
84 if (value != null) {
85 try {
86 value = evaluate(value, context);
87 } catch (ADLException e) {
88 throw new ADLException(e.getMessage(), node, null);
89 }
90 attrs.put(attr, value);
91 }
92 }
93 node.astSetAttributes(attrs);
94
95 String [] nodeTypes = node.astGetNodeTypes();
96 for (int j = 0; j < nodeTypes.length; ++j) {
97 Node[] nodes = node.astGetNodes(nodeTypes[j]);
98 for (int k = 0; k < nodes.length; ++k) {
99 Node n = nodes[k];
100 if (n != null) {
101 evaluate(n, context);
102 }
103 }
104 }
105 }
106
107 String evaluate (final String s, final Map context) throws ADLException {
108 int i = s.indexOf("${");
109 if (i == -1) {
110 return s;
111 }
112 int j = s.indexOf('}', i);
113 if (j == -1) {
114 throw new ADLException("Malformed variable reference in '" + s + "'", null);
115 }
116 String arg = s.substring(i + 2, j);
117 String value = (String )context.get(arg);
118 if (value == null) {
119 throw new ADLException("Undefined variable '" + arg + "'", null);
120 }
121 return evaluate(s.substring(0, i) + value + s.substring(j + 1), context);
122 }
123 }
124 |
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