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 android.webkit;
  
  import android.annotation.NonNull;
  import android.annotation.Nullable;
  
  /**
   * Manages Service Workers used by WebView.
   *
   * <p>Example usage:
   * <pre class="prettyprint">
   * ServiceWorkerController swController = ServiceWorkerController.getInstance();
   * swController.setServiceWorkerClient(new ServiceWorkerClient() {
   *   {@literal @}Override
   *   public WebResourceResponse shouldInterceptRequest(WebResourceRequest request) {
   *     // Capture request here and generate response or allow pass-through
   *     // by returning null.
   *     return null;
   *   }
   * });
   * </pre>
   */
  public abstract class ServiceWorkerController {
  
      /**
       * @deprecated This class should not be constructed by applications, use {@link #getInstance()}
       * instead to fetch the singleton instance.
       */
      // TODO(ntfschr): mark this as @SystemApi after a year.
      @Deprecated
      public ServiceWorkerController() {}
  
      /**
       * Returns the default ServiceWorkerController instance. At present there is
       * only one ServiceWorkerController instance for all WebView instances,
       * however this restriction may be relaxed in the future.
       *
       * @return the default ServiceWorkerController instance
       */
       @NonNull
       public static ServiceWorkerController getInstance() {
           return WebViewFactory.getProvider().getServiceWorkerController();
       }
  
      /**
       * Gets the settings for all service workers.
       *
       * @return the current ServiceWorkerWebSettings
       */
      @NonNull
      public abstract ServiceWorkerWebSettings getServiceWorkerWebSettings();
  
      /**
       * Sets the client to capture service worker related callbacks.
       *
       * A {@link ServiceWorkerClient} should be set before any service workers are
       * active, e.g. a safe place is before any WebView instances are created or
       * pages loaded.
       */
      public abstract void setServiceWorkerClient(@Nullable ServiceWorkerClient client);
  }
  
  