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      1 /*
      2  * Copyright (C) 2018 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.settings.datetime.timezone.model;
     18 
     19 import android.app.LoaderManager;
     20 import android.content.Context;
     21 import android.content.Loader;
     22 import android.os.Bundle;
     23 
     24 import com.android.settingslib.utils.AsyncLoader;
     25 
     26 public class TimeZoneDataLoader extends AsyncLoader<TimeZoneData> {
     27 
     28     public TimeZoneDataLoader(Context context) {
     29         super(context);
     30     }
     31 
     32     @Override
     33     public TimeZoneData loadInBackground() {
     34         // Heavy operation due to reading the underlying file
     35         return TimeZoneData.getInstance();
     36     }
     37 
     38     @Override
     39     protected void onDiscardResult(TimeZoneData result) {
     40         // This class doesn't hold resource of the result.
     41     }
     42 
     43     public interface OnDataReadyCallback {
     44         void onTimeZoneDataReady(TimeZoneData data);
     45     }
     46 
     47     public static class LoaderCreator implements LoaderManager.LoaderCallbacks<TimeZoneData> {
     48 
     49         private final Context mContext;
     50         private final OnDataReadyCallback mCallback;
     51 
     52         public LoaderCreator(Context context, OnDataReadyCallback callback) {
     53             mContext = context;
     54             mCallback = callback;
     55         }
     56 
     57         @Override
     58         public Loader onCreateLoader(int id, Bundle args) {
     59             return new TimeZoneDataLoader(mContext);
     60         }
     61 
     62         @Override
     63         public void onLoadFinished(Loader<TimeZoneData> loader, TimeZoneData data) {
     64             if (mCallback != null) {
     65                 mCallback.onTimeZoneDataReady(data);
     66             }
     67         }
     68 
     69         @Override
     70         public void onLoaderReset(Loader<TimeZoneData> loader) {
     71             //It's okay to keep the time zone data when loader is reset
     72         }
     73     }
     74 }
     75