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1
2
3 package org.apache.el.parser;
4
5 import java.lang.reflect.InvocationTargetException  ;
6 import java.lang.reflect.Method ;
7
8 import javax.el.ELException;
9 import javax.el.FunctionMapper;
10
11 import org.apache.el.lang.EvaluationContext;
12 import org.apache.el.util.MessageFactory;
13
14
15
19 public final class AstFunction extends SimpleNode {
20
21 protected String localName = "";
22
23 protected String prefix = "";
24
25 public AstFunction(int id) {
26 super(id);
27 }
28
29 public String getLocalName() {
30 return localName;
31 }
32
33 public String getOutputName() {
34 if (this.prefix == null) {
35 return this.localName;
36 } else {
37 return this.prefix + ":" + this.localName;
38 }
39 }
40
41 public String getPrefix() {
42 return prefix;
43 }
44
45 public Class getType(EvaluationContext ctx)
46 throws ELException {
47
48 FunctionMapper fnMapper = ctx.getFunctionMapper();
49
50 if (fnMapper == null) {
52 throw new ELException(MessageFactory.get("error.fnMapper.null"));
53 }
54 Method m = fnMapper.resolveFunction(this.prefix, this.localName);
55 if (m == null) {
56 throw new ELException(MessageFactory.get("error.fnMapper.method",
57 this.getOutputName()));
58 }
59 return m.getReturnType();
60 }
61
62 public Object getValue(EvaluationContext ctx)
63 throws ELException {
64
65 FunctionMapper fnMapper = ctx.getFunctionMapper();
66
67 if (fnMapper == null) {
69 throw new ELException(MessageFactory.get("error.fnMapper.null"));
70 }
71 Method m = fnMapper.resolveFunction(this.prefix, this.localName);
72 if (m == null) {
73 throw new ELException(MessageFactory.get("error.fnMapper.method",
74 this.getOutputName()));
75 }
76
77 Class [] paramTypes = m.getParameterTypes();
78 Object [] params = null;
79 Object result = null;
80 int numParams = this.jjtGetNumChildren();
81 if (numParams > 0) {
82 params = new Object [numParams];
83 try {
84 for (int i = 0; i < numParams; i++) {
85 params[i] = this.children[i].getValue(ctx);
86 params[i] = coerceToType(params[i], paramTypes[i]);
87 }
88 } catch (ELException ele) {
89 throw new ELException(MessageFactory.get("error.function", this
90 .getOutputName()), ele);
91 }
92 }
93 try {
94 result = m.invoke(null, params);
95 } catch (IllegalAccessException iae) {
96 throw new ELException(MessageFactory.get("error.function", this
97 .getOutputName()), iae);
98 } catch (InvocationTargetException ite) {
99 throw new ELException(MessageFactory.get("error.function", this
100 .getOutputName()), ite.getCause());
101 }
102 return result;
103 }
104
105 public void setLocalName(String localName) {
106 this.localName = localName;
107 }
108
109 public void setPrefix(String prefix) {
110 this.prefix = prefix;
111 }
112
113
114 public String toString()
115 {
116 return ELParserTreeConstants.jjtNodeName[id] + "[" + this.getOutputName() + "]";
117 }
118 }
119 |
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