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 android.util;
  
  import android.annotation.TestApi;
  import android.content.Context;
  import android.os.SystemProperties;
  import android.provider.Settings;
  import android.text.TextUtils;
  
  import java.util.HashMap;
  import java.util.Map;
  
  /**
   * Util class to get feature flag information.
   *
   * @hide
   */
  @TestApi
  public class FeatureFlagUtils {
  
      public static final String FFLAG_PREFIX = "sys.fflag.";
      public static final String FFLAG_OVERRIDE_PREFIX = FFLAG_PREFIX + "override.";
      public static final String PERSIST_PREFIX = "persist." + FFLAG_OVERRIDE_PREFIX;
      public static final String SEAMLESS_TRANSFER = "settings_seamless_transfer";
      public static final String HEARING_AID_SETTINGS = "settings_bluetooth_hearing_aid";
      public static final String SCREENRECORD_LONG_PRESS = "settings_screenrecord_long_press";
      public static final String PIXEL_WALLPAPER_CATEGORY_SWITCH =
              "settings_pixel_wallpaper_category_switch";
      public static final String DYNAMIC_SYSTEM = "settings_dynamic_system";
  
      private static final Map<String, String> DEFAULT_FLAGS;
  
      static {
          DEFAULT_FLAGS = new HashMap<>();
          DEFAULT_FLAGS.put("settings_audio_switcher", "true");
          DEFAULT_FLAGS.put("settings_mobile_network_v2", "true");
          DEFAULT_FLAGS.put("settings_network_and_internet_v2", "true");
          DEFAULT_FLAGS.put("settings_systemui_theme", "true");
          DEFAULT_FLAGS.put(DYNAMIC_SYSTEM, "false");
          DEFAULT_FLAGS.put(SEAMLESS_TRANSFER, "false");
          DEFAULT_FLAGS.put(HEARING_AID_SETTINGS, "false");
          DEFAULT_FLAGS.put(SCREENRECORD_LONG_PRESS, "false");
          DEFAULT_FLAGS.put(PIXEL_WALLPAPER_CATEGORY_SWITCH, "false");
          DEFAULT_FLAGS.put("settings_wifi_details_datausage_header", "false");
          DEFAULT_FLAGS.put("settings_skip_direction_mutable", "true");
      }
  
      /**
       * Whether or not a flag is enabled.
       *
       * @param feature the flag name
       * @return true if the flag is enabled (either by default in system, or override by user)
       */
      public static boolean isEnabled(Context context, String feature) {
          // Override precedence:
          // Settings.Global -> sys.fflag.override.* -> static list
  
          // Step 1: check if feature flag is set in Settings.Global.
          String value;
          if (context != null) {
              value = Settings.Global.getString(context.getContentResolver(), feature);
              if (!TextUtils.isEmpty(value)) {
                  return Boolean.parseBoolean(value);
              }
          }
  
          // Step 2: check if feature flag has any override. Flag name: sys.fflag.override.<feature>
          value = SystemProperties.get(FFLAG_OVERRIDE_PREFIX + feature);
          if (!TextUtils.isEmpty(value)) {
              return Boolean.parseBoolean(value);
          }
          // Step 3: check if feature flag has any default value.
          value = getAllFeatureFlags().get(feature);
          return Boolean.parseBoolean(value);
      }
  
      /**
       * Override feature flag to new state.
       */
      public static void setEnabled(Context context, String feature, boolean enabled) {
          SystemProperties.set(FFLAG_OVERRIDE_PREFIX + feature, enabled ? "true" : "false");
      }
  
      /**
       * Returns all feature flags in their raw form.
       */
      public static Map<String, String> getAllFeatureFlags() {
          return DEFAULT_FLAGS;
      }
  }
  