1 /*
2  * Copyright (C) 2013 Google Inc.
3  * Licensed to The Android Open Source Project.
4  *
5  * Licensed under the Apache License, Version 2.0 (the "License");
6  * you may not use this file except in compliance with the License.
7  * You may obtain a copy of the License at
8  *
9  *      http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17 
18 package com.android.mail.ui;
19 
20 import android.app.Fragment;
21 
22 import com.android.mail.utils.LogTag;
23 import com.android.mail.utils.LogUtils;
24 
25 /**
26  * Small Runnable-like wrapper that first checks that the Fragment is in a good state before
27  * doing any work. Ideal for use with a {@link android.os.Handler}.
28  */
29 public abstract class FragmentRunnable implements Runnable {
30     private static final String LOG_TAG = LogTag.getLogTag();
31 
32     private final String mOpName;
33     private final Fragment mFragment;
34 
FragmentRunnable(String opName, Fragment fragment)35     public FragmentRunnable(String opName, Fragment fragment) {
36         mOpName = opName;
37         mFragment = fragment;
38     }
39 
go()40     public abstract void go();
41 
42     @Override
run()43     public void run() {
44         if (!mFragment.isAdded()) {
45             LogUtils.i(LOG_TAG, "Unable to run op='%s' b/c fragment is not attached: %s",
46                     mOpName, mFragment);
47             return;
48         }
49         go();
50     }
51 }