Gets a List of all interfaces implemented by the given class and its superclasses. The order is determined by looking through each interface in turn as declared in the source file and following its hierarchy up. - Android java.lang.reflect

Android examples for java.lang.reflect:New Instance

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Description

Gets a List of all interfaces implemented by the given class and its superclasses. The order is determined by looking through each interface in turn as declared in the source file and following its hierarchy up.

Demo Code

/*/*from  w w w  .ja  va  2  s . c  o  m*/
 * Original work Copyright (c) 2005-2008, The Android Open Source Project
 * Modified work Copyright (c) 2013, rovo89 and Tungstwenty
 * Modified work Copyright (c) 2015, Alibaba Mobile Infrastructure (Android) Team
 *
 * Licensed 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 com.java2s;
import java.util.ArrayList;

import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.List;

public class Main {
    /**
     * <p>Gets a {@code List} of all interfaces implemented by the given
     * class and its superclasses.</p>
     *
     * <p>The order is determined by looking through each interface in turn as
     * declared in the source file and following its hierarchy up. Then each
     * superclass is considered in the same way. Later duplicates are ignored,
     * so the order is maintained.</p>
     *
     * @param cls  the class to look up, may be {@code null}
     * @return the {@code List} of interfaces in order,
     *  {@code null} if null input
     */
    public static List<Class<?>> getAllInterfaces(Class<?> cls) {
        if (cls == null) {
            return null;
        }

        LinkedHashSet<Class<?>> interfacesFound = new LinkedHashSet<Class<?>>();
        getAllInterfaces(cls, interfacesFound);

        return new ArrayList<Class<?>>(interfacesFound);
    }

    /**
     * Get the interfaces for the specified class.
     *
     * @param cls  the class to look up, may be {@code null}
     * @param interfacesFound the {@code Set} of interfaces for the class
     */
    private static void getAllInterfaces(Class<?> cls,
            HashSet<Class<?>> interfacesFound) {
        while (cls != null) {
            Class<?>[] interfaces = cls.getInterfaces();

            for (Class<?> i : interfaces) {
                if (interfacesFound.add(i)) {
                    getAllInterfaces(i, interfacesFound);
                }
            }

            cls = cls.getSuperclass();
        }
    }
}

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