packages/NetworkStack/src/android/net/util/NetworkStackUtils.java

/*
 * Copyright (C) 2019 The Android Open Source Project
 *
 * 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 android.net.util;

import android.annotation.NonNull;

import java.io.FileDescriptor;
import java.io.IOException;
import java.util.List;

/**
 * Collection of utilities for the network stack.
 */
public class NetworkStackUtils {

    /**
     * @return True if the array is null or 0-length.
     */
    public static <T> boolean isEmpty(T[] array) {
        return array == null || array.length == 0;
    }

    /**
     * Close a socket, ignoring any exception while closing.
     */
    public static void closeSocketQuietly(FileDescriptor fd) {
        try {
            SocketUtils.closeSocket(fd);
        } catch (IOException ignored) {
        }
    }

    /**
     * Returns an int array from the given Integer list.
     */
    public static int[] convertToIntArray(@NonNull List<Integer> list) {
        int[] array = new int[list.size()];
        for (int i = 0; i < list.size(); i++) {
            array[i] = list.get(i);
        }
        return array;
    }

    /**
     * Returns a long array from the given long list.
     */
    public static long[] convertToLongArray(@NonNull List<Long> list) {
        long[] array = new long[list.size()];
        for (int i = 0; i < list.size(); i++) {
            array[i] = list.get(i);
        }
        return array;
    }
}