content: /*
   * Copyright (C) 2016 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.launcher3.util;
  
  import android.os.Looper;
  
  import com.android.launcher3.LauncherModel;
  import com.android.launcher3.config.FeatureFlags;
  
  /**
   * A set of utility methods for thread verification.
   */
  public class Preconditions {
  
      public static void assertNotNull(Object o) {
          if (FeatureFlags.IS_DOGFOOD_BUILD && o == null) {
              throw new IllegalStateException();
          }
      }
  
      public static void assertWorkerThread() {
          if (FeatureFlags.IS_DOGFOOD_BUILD && !isSameLooper(LauncherModel.getWorkerLooper())) {
              throw new IllegalStateException();
          }
      }
  
      public static void assertUIThread() {
          if (FeatureFlags.IS_DOGFOOD_BUILD && !isSameLooper(Looper.getMainLooper())) {
              throw new IllegalStateException();
          }
      }
  
      public static void assertNonUiThread() {
          if (FeatureFlags.IS_DOGFOOD_BUILD && isSameLooper(Looper.getMainLooper())) {
              throw new IllegalStateException();
          }
      }
  
      private static boolean isSameLooper(Looper looper) {
          return Looper.myLooper() == looper;
      }
  }
  