检查给定的类是否具有具有相同签名的方法，并考虑通用类型

/*

 * 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.

 */

import java.lang.reflect.Method;

import javax.enterprise.inject.Typed;
/** 
 来自 时 代 J a v a 公 众 号**/

import java.security.AccessController;

import java.security.PrivilegedAction;

import java.util.jar.Manifest;

import java.util.jar.Attributes;

import java.net.URL;


public class Main{

    /**

     * Checks if the given class has a method with the same signature, taking in to account generic types

     * @param targetClass

     * @param method

     * @return if it contains a method with the same signature.

     */

    public static boolean containsPossiblyGenericMethod(

            Class<?> targetClass, Method method) {

        return extractPossiblyGenericMethod(targetClass, method) != null;

    }

    /**

     * Extracts a method matching the source method, allowing generic type parameters to be substituted as

     * long as they are properly castable.

     *

     * @param clazz The target class

     * @param sourceMethod The source method.

     * @return the extracted method or <code>null</code>

     */

    public static Method extractPossiblyGenericMethod(Class<?> clazz,//来自 N o w J a v a . c o m - 时代Java

            Method sourceMethod) {

        Method exactMethod = extractMethod(clazz, sourceMethod);

        if (exactMethod == null) {

            String methodName = sourceMethod.getName();

            Class<?>[] parameterTypes = sourceMethod.getParameterTypes();

            for (Method method : clazz.getMethods()) {

                if (method.getName().equals(methodName)

                        && allSameType(method.getParameterTypes(),

                                parameterTypes)) {

                    return method;

                }

            }

            return null;

        } else {

            return exactMethod;

        }

    }

    /**

     * Extracts a method with same signature as the source method.

     * 

     * @param clazz The target class

     * @param sourceMethod The source method.

     * @return the extracted method or <code>null</code>

     */

    public static Method extractMethod(Class<?> clazz, Method sourceMethod) {

        try {

            String name = sourceMethod.getName();

            return clazz != null ? clazz.getMethod(name,

                    sourceMethod.getParameterTypes()) : null;

        } catch (NoSuchMethodException e) {

            return null;

        }

    }