content: /*
   * Copyright (C) 2013 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;
  
  import com.android.internal.annotations.VisibleForTesting;
  
  import android.util.ArrayMap;
  
  /**
   * This class is used in a similar way as ServiceManager, except the services registered here
   * are not Binder objects and are only available in the same process.
   *
   * Once all services are converted to the SystemService interface, this class can be absorbed
   * into SystemServiceManager.
   *
   * {@hide}
   */
  public final class LocalServices {
      private LocalServices() {}
  
      private static final ArrayMap<Class<?>, Object> sLocalServiceObjects =
              new ArrayMap<Class<?>, Object>();
  
      /**
       * Returns a local service instance that implements the specified interface.
       *
       * @param type The type of service.
       * @return The service object.
       */
      @SuppressWarnings("unchecked")
      public static <T> T getService(Class<T> type) {
          synchronized (sLocalServiceObjects) {
              return (T) sLocalServiceObjects.get(type);
          }
      }
  
      /**
       * Adds a service instance of the specified interface to the global registry of local services.
       */
      public static <T> void addService(Class<T> type, T service) {
          synchronized (sLocalServiceObjects) {
              if (sLocalServiceObjects.containsKey(type)) {
                  throw new IllegalStateException("Overriding service registration");
              }
              sLocalServiceObjects.put(type, service);
          }
      }
  
      /**
       * Remove a service instance, must be only used in tests.
       */
      @VisibleForTesting
      public static <T> void removeServiceForTest(Class<T> type) {
          synchronized (sLocalServiceObjects) {
              sLocalServiceObjects.remove(type);
          }
      }
  }
  