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 androidx.test.espresso.remote;
  
  import java.util.concurrent.atomic.AtomicReference;
  
  /** An exposed registry instance to make it easy for callers to get a hold of Remote Interaction */
  public class RemoteInteractionRegistry {
  
    private static final AtomicReference<RemoteInteraction> sInstance =
        new AtomicReference<RemoteInteraction>(new NoopRemoteInteraction());
  
    private RemoteInteractionRegistry() {
      // singleton - disallow creation
    }
  
    /**
     * Returns the {@link RemoteInteraction}
     *
     * <p>This remote interaction is not guaranteed to be present under all instrumentations.
     *
     * @return RemoteInteraction the remote interaction for this application. If no remote interaction
     *     has been registered a {@link NoopRemoteInteraction} will be returned.
     */
    public static RemoteInteraction getInstance() {
      return sInstance.get();
    }
  
    /**
     * Stores the remote interaction in the registry.
     *
     * <p>This is a global registry - so be aware of the impact of calling this method!
     *
     * @param remoteInteraction the remote interaction for this application. <@code>Null</@code>
     *     de-registers any existing monitor.
     */
    public static void registerInstance(RemoteInteraction remoteInteraction) {
      if (null == remoteInteraction) {
        sInstance.set(new NoopRemoteInteraction());
      } else {
        sInstance.set(remoteInteraction);
      }
    }
  }
  