tests/obd2_test/src/com/android/car/obd2/test/Utils.java

/*
 * Copyright (C) 2017 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 com.android.car.obd2.test;

import java.util.ArrayList;
import java.util.Arrays;

public class Utils {
    private Utils() {}

    static int[] stringsToIntArray(String... strings) {
        ArrayList<Integer> arrayList = new ArrayList<>();
        for (String string : strings) {
            string.chars().forEach(arrayList::add);
        }
        return arrayList.stream().mapToInt(Integer::intValue).toArray();
    }

    static int[] concatIntArrays(int[]... arrays) {
        // corner and trivial cases
        if (0 == arrays.length) return new int[] {};
        if (1 == arrays.length) return arrays[0];

        // the general case in its full glory
        int totalSize = Arrays.stream(arrays).mapToInt((int[] array) -> array.length).sum();
        int[] newArray = Arrays.copyOf(arrays[0], totalSize);
        int usedSize = arrays[0].length;
        for (int i = 1; i < arrays.length; ++i) {
            int[] array = arrays[i];
            int length = array.length;
            System.arraycopy(array, 0, newArray, usedSize, length);
            usedSize += length;
        }
        return newArray;
    }
}