content: /**
   * 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.server.broadcastradio.hal1;
  
  import android.annotation.NonNull;
  import android.annotation.Nullable;
  import android.util.Slog;
  
  import java.util.Map;
  import java.util.Set;
  
  class Convert {
      private static final String TAG = "BroadcastRadioService.Convert";
  
      /**
       * Converts string map to an array that's easily accessible by native code.
       *
       * Calling this java method once is more efficient than converting map object on the native
       * side, which requires several separate java calls for each element.
       *
       * @param map map to convert.
       * @returns array (sized the same as map) of two-element string arrays
       *          (first element is the key, second is value).
       */
      static @NonNull String[][] stringMapToNative(@Nullable Map<String, String> map) {
          if (map == null) {
              Slog.v(TAG, "map is null, returning zero-elements array");
              return new String[0][0];
          }
  
          Set<Map.Entry<String, String>> entries = map.entrySet();
          int len = entries.size();
          String[][] arr = new String[len][2];
  
          int i = 0;
          for (Map.Entry<String, String> entry : entries) {
              arr[i][0] = entry.getKey();
              arr[i][1] = entry.getValue();
              i++;
          }
  
          Slog.v(TAG, "converted " + i + " element(s)");
          return arr;
      }
  }
  