get Accessible Method From Interface Nest - Java Reflection

Java examples for Reflection:Method

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Description

get Accessible Method From Interface Nest

Demo Code

/*/*  w w w  .  ja  va 2 s .  c o  m*/
 **        DroidPlugin Project
 **
 ** Copyright(c) 2015 Andy Zhang <zhangyong232@gmail.com>
 **
 ** This file is part of DroidPlugin.
 **
 ** DroidPlugin is free software: you can redistribute it and/or
 ** modify it under the terms of the GNU Lesser General Public
 ** License as published by the Free Software Foundation, either
 ** version 3 of the License, or (at your option) any later version.
 **
 ** DroidPlugin is distributed in the hope that it will be useful,
 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 ** Lesser General Public License for more details.
 **
 ** You should have received a copy of the GNU Lesser General Public
 ** License along with DroidPlugin.  If not, see <http://www.gnu.org/licenses/lgpl.txt>
 **
 **/
//package com.java2s;

import java.lang.reflect.Method;
import java.lang.reflect.Modifier;

public class Main {
    private static Method getAccessibleMethodFromInterfaceNest(
            Class<?> cls, final String methodName,
            final Class<?>... parameterTypes) {
        // Search up the superclass chain
        for (; cls != null; cls = cls.getSuperclass()) {

            // Check the implemented interfaces of the parent class
            final Class<?>[] interfaces = cls.getInterfaces();
            for (int i = 0; i < interfaces.length; i++) {
                // Is this interface public?
                if (!Modifier.isPublic(interfaces[i].getModifiers())) {
                    continue;
                }
                // Does the method exist on this interface?
                try {
                    return interfaces[i].getDeclaredMethod(methodName,
                            parameterTypes);
                } catch (final NoSuchMethodException e) { // NOPMD
                    /*
                     * Swallow, if no method is found after the loop then this
                     * method returns null.
                     */
                }
                // Recursively check our parent interfaces
                Method method = getAccessibleMethodFromInterfaceNest(
                        interfaces[i], methodName, parameterTypes);
                if (method != null) {
                    return method;
                }
            }
        }
        return null;
    }
}

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