01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one
03: * or more contributor license agreements. See the NOTICE file
04: * distributed with this work for additional information
05: * regarding copyright ownership. The ASF licenses this file
06: * to you under the Apache License, Version 2.0 (the
07: * "License"); you may not use this file except in compliance
08: * with the License. You may obtain a copy of the License at
09: *
10: * http://www.apache.org/licenses/LICENSE-2.0
11: *
12: * Unless required by applicable law or agreed to in writing,
13: * software distributed under the License is distributed on an
14: * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15: * KIND, either express or implied. See the License for the
16: * specific language governing permissions and limitations
17: * under the License.
18: */
19:
20: package org.apache.axis2.description.java2wsdl.bytecode;
21:
22: import org.apache.commons.logging.Log;
23: import org.apache.commons.logging.LogFactory;
24:
25: import java.io.IOException;
26: import java.lang.reflect.Method;
27: import java.lang.reflect.Proxy;
28:
29: /**
30: * This class retrieves function parameter names from bytecode built with
31: * debugging symbols. Used as a last resort when creating WSDL.
32: */
33: public class ParamNameExtractor {
34:
35: private static final Log log = LogFactory
36: .getLog(ParamNameExtractor.class);
37:
38: /**
39: * Retrieves a list of function parameter names from a method.
40: * Returns null if unable to read parameter names (i.e. bytecode not
41: * built with debug).
42: */
43: public static String[] getParameterNamesFromDebugInfo(Method method) {
44: // Don't worry about it if there are no params.
45: int numParams = method.getParameterTypes().length;
46: if (numParams == 0)
47: return null;
48:
49: // get declaring class
50: Class c = method.getDeclaringClass();
51:
52: // Don't worry about it if the class is a Java dynamic proxy
53: if (Proxy.isProxyClass(c)) {
54: return null;
55: }
56:
57: try {
58: // get a parameter reader
59: ParamReader pr = new ParamReader(c);
60: // get the parameter names
61: return pr.getParameterNames(method);
62: } catch (IOException e) {
63: // log it and leave
64: return null;
65: }
66: }
67: }
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