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      1 /*
      2  * Copyright (C) 2016 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 package com.android.contacts.model.account;
     17 
     18 import android.app.Activity;
     19 import android.app.Fragment;
     20 import android.app.LoaderManager;
     21 import android.content.Context;
     22 import android.content.IntentFilter;
     23 import android.content.Loader;
     24 import android.os.Bundle;
     25 
     26 import com.android.contacts.model.AccountTypeManager;
     27 import com.android.contacts.util.concurrent.ListenableFutureLoader;
     28 import com.google.common.base.Objects;
     29 import com.google.common.base.Predicate;
     30 import com.google.common.base.Predicates;
     31 import com.google.common.util.concurrent.ListenableFuture;
     32 
     33 import java.util.List;
     34 
     35 /**
     36  * Loads the accounts from AccountTypeManager
     37  */
     38 public class AccountsLoader extends ListenableFutureLoader<List<AccountInfo>> {
     39     private final AccountTypeManager mAccountTypeManager;
     40     private final Predicate<AccountInfo> mFilter;
     41 
     42     public AccountsLoader(Context context) {
     43         this(context, Predicates.<AccountInfo>alwaysTrue());
     44     }
     45 
     46     public AccountsLoader(Context context, Predicate<AccountInfo> filter) {
     47         super(context, new IntentFilter(AccountTypeManager.BROADCAST_ACCOUNTS_CHANGED));
     48         mAccountTypeManager = AccountTypeManager.getInstance(context);
     49         mFilter = filter;
     50     }
     51 
     52     @Override
     53     protected ListenableFuture<List<AccountInfo>> loadData() {
     54         return mAccountTypeManager.filterAccountsAsync(mFilter);
     55     }
     56 
     57     @Override
     58     protected boolean isSameData(List<AccountInfo> previous, List<AccountInfo> next) {
     59         return Objects.equal(AccountInfo.extractAccounts(previous),
     60                 AccountInfo.extractAccounts(next));
     61     }
     62 
     63 
     64     public interface AccountsListener {
     65         void onAccountsLoaded(List<AccountInfo> accounts);
     66     }
     67 
     68     /**
     69      * Loads the accounts into the target fragment using {@link LoaderManager}
     70      *
     71      * <p>This is a convenience method to reduce the
     72      * boilerplate needed when implementing {@link android.app.LoaderManager.LoaderCallbacks}
     73      * in the simple case that the fragment wants to just load the accounts directly</p>
     74      * <p>Note that changing the filter between invocations in the same component will not work
     75      * properly because the loader is cached.</p>
     76      */
     77     public static <FragmentType extends Fragment & AccountsListener> void loadAccounts(
     78             final FragmentType fragment, int loaderId, final Predicate<AccountInfo> filter) {
     79         loadAccounts(
     80                 fragment.getActivity(), fragment.getLoaderManager(), loaderId, filter, fragment);
     81     }
     82 
     83     /**
     84      * Same as {@link #loadAccounts(Fragment, int, Predicate)} for an Activity
     85      */
     86     public static <ActivityType extends Activity & AccountsListener> void loadAccounts(
     87             final ActivityType activity, int id, final Predicate<AccountInfo> filter) {
     88         loadAccounts(activity, activity.getLoaderManager(), id, filter, activity);
     89     }
     90 
     91     private static void loadAccounts(final Context context, LoaderManager loaderManager, int id,
     92             final Predicate<AccountInfo> filter, final AccountsListener listener) {
     93         loaderManager.initLoader(id, null,
     94                 new LoaderManager.LoaderCallbacks<List<AccountInfo>>() {
     95                     @Override
     96                     public Loader<List<AccountInfo>> onCreateLoader(int id, Bundle args) {
     97                         return new AccountsLoader(context, filter);
     98                     }
     99 
    100                     @Override
    101                     public void onLoadFinished(
    102                             Loader<List<AccountInfo>> loader, List<AccountInfo> data) {
    103                         listener.onAccountsLoaded(data);
    104                     }
    105 
    106                     @Override
    107                     public void onLoaderReset(Loader<List<AccountInfo>> loader) {
    108                     }
    109                 });
    110     }
    111 }
    112