org.apache.bytecode.ParamNameExtractor Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.bytecode;
import java.io.IOException;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
/**
* This class retrieves function parameter names from bytecode built with
* debugging symbols. Used as a last resort when creating WSDL.
*/
public class ParamNameExtractor {
/**
* Retrieves a list of function parameter names from a method.
* Returns null if unable to read parameter names (i.e. bytecode not
* built with debug).
*/
public static String[] getParameterNamesFromDebugInfo(Method method) {
// Don't worry about it if there are no params.
int numParams = method.getParameterTypes().length;
if (numParams == 0)
return null;
// get declaring class
Class c = method.getDeclaringClass();
// Don't worry about it if the class is a Java dynamic proxy
if (Proxy.isProxyClass(c)) {
return null;
}
try {
// get a parameter reader
ParamReader pr = new ParamReader(c);
// get the parameter names
return pr.getParameterNames(method);
} catch (IOException e) {
// log it and leave
return null;
}
}
}