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 
17 package com.android.documentsui.base;
18 
19 import android.app.Activity;
20 
21 /**
22  * An {@link CheckedTask} that guards work with checks that a paired {@link Activity}
23  * is still alive. Instances of this class make no progress.
24  *
25  * @template Owner Activity type.
26  * @template Input input type
27  * @template Output output type
28  */
29 public abstract class PairedTask<Owner extends Activity, Input, Output>
30         extends CheckedTask<Input, Output> {
31 
32     protected final Owner mOwner;
33 
PairedTask(Owner owner)34     public PairedTask(Owner owner) {
35         super(owner::isDestroyed);
36         mOwner = owner;
37     }
38 }
39