content: /*
   * Copyright (C) 2014 Hari Krishna Dulipudi
   * 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 dev.dworks.apps.anexplorer.loader;
  
  import android.content.Context;
  
  import java.util.Collection;
  
  import dev.dworks.apps.anexplorer.BaseActivity.State;
  import dev.dworks.apps.anexplorer.misc.AsyncTaskLoader;
  import dev.dworks.apps.anexplorer.misc.RootsCache;
  import dev.dworks.apps.anexplorer.model.RootInfo;
  
  public class RootsLoader extends AsyncTaskLoader<Collection<RootInfo>> {
      private final ForceLoadContentObserver mObserver = new ForceLoadContentObserver();
  
      private final RootsCache mRoots;
      private final State mState;
  
      private Collection<RootInfo> mResult;
  
      public RootsLoader(Context context, RootsCache roots, State state) {
          super(context);
          mRoots = roots;
          mState = state;
  
          getContext().getContentResolver()
                  .registerContentObserver(RootsCache.sNotificationUri, false, mObserver);
      }
  
      @Override
      public final Collection<RootInfo> loadInBackground() {
          return mRoots.getMatchingRootsBlocking(mState);
      }
  
      @Override
      public void deliverResult(Collection<RootInfo> result) {
          if (isReset()) {
              return;
          }
          //Collection<RootInfo> oldResult = mResult;
          mResult = result;
  
          if (isStarted()) {
              super.deliverResult(result);
          }
      }
  
      @Override
      protected void onStartLoading() {
          if (mResult != null) {
              deliverResult(mResult);
          }
          if (takeContentChanged() || mResult == null) {
              forceLoad();
          }
      }
  
      @Override
      protected void onStopLoading() {
          cancelLoad();
      }
  
      @Override
      protected void onReset() {
          super.onReset();
  
          // Ensure the loader is stopped
          onStopLoading();
  
          mResult = null;
  
          getContext().getContentResolver().unregisterContentObserver(mObserver);
      }
  }