1/**
2 * Copyright (C) 2017 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.server.broadcastradio;
18
19import android.annotation.NonNull;
20import android.annotation.Nullable;
21import android.util.Slog;
22
23import java.util.Map;
24import java.util.Set;
25
26class Convert {
27    private static final String TAG = "BroadcastRadioService.Convert";
28
29    /**
30     * Converts string map to an array that's easily accessible by native code.
31     *
32     * Calling this java method once is more efficient than converting map object on the native
33     * side, which requires several separate java calls for each element.
34     *
35     * @param map map to convert.
36     * @returns array (sized the same as map) of two-element string arrays
37     *          (first element is the key, second is value).
38     */
39    static @NonNull String[][] stringMapToNative(@Nullable Map<String, String> map) {
40        if (map == null) {
41            Slog.v(TAG, "map is null, returning zero-elements array");
42            return new String[0][0];
43        }
44
45        Set<Map.Entry<String, String>> entries = map.entrySet();
46        int len = entries.size();
47        String[][] arr = new String[len][2];
48
49        int i = 0;
50        for (Map.Entry<String, String> entry : entries) {
51            arr[i][0] = entry.getKey();
52            arr[i][1] = entry.getValue();
53            i++;
54        }
55
56        Slog.v(TAG, "converted " + i + " element(s)");
57        return arr;
58    }
59}
60