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 android.os.health;
18 
19 import android.annotation.TestApi;
20 import android.compat.annotation.UnsupportedAppUsage;
21 import android.os.Parcel;
22 import android.os.Parcelable;
23 
24 /**
25  * Class to allow sending the HealthStats through aidl generated glue.
26  *
27  * The alternative would be to send a HealthStats object, which would
28  * require constructing one, and then immediately flattening it. This
29  * saves that step at the cost of doing the extra flattening when
30  * accessed in the same process as the writer.
31  *
32  * The HealthStatsWriter passed in the constructor is retained, so don't
33  * reuse them.
34  * @hide
35  */
36 @TestApi
37 public class HealthStatsParceler implements Parcelable {
38     private HealthStatsWriter mWriter;
39     private HealthStats mHealthStats;
40 
41     @UnsupportedAppUsage
42     public static final @android.annotation.NonNull Parcelable.Creator<HealthStatsParceler> CREATOR
43             = new Parcelable.Creator<HealthStatsParceler>() {
44         public HealthStatsParceler createFromParcel(Parcel in) {
45             return new HealthStatsParceler(in);
46         }
47 
48         public HealthStatsParceler[] newArray(int size) {
49             return new HealthStatsParceler[size];
50         }
51     };
52 
HealthStatsParceler(HealthStatsWriter writer)53     public HealthStatsParceler(HealthStatsWriter writer) {
54         mWriter = writer;
55     }
56 
HealthStatsParceler(Parcel in)57     public HealthStatsParceler(Parcel in) {
58         mHealthStats = new HealthStats(in);
59     }
60 
describeContents()61     public int describeContents() {
62         return 0;
63     }
64 
writeToParcel(Parcel out, int flags)65     public void writeToParcel(Parcel out, int flags) {
66         // See comment on mWriter declaration above.
67         if (mWriter != null) {
68             mWriter.flattenToParcel(out);
69         } else {
70             throw new RuntimeException("Can not re-parcel HealthStatsParceler that was"
71                     + " constructed from a Parcel");
72         }
73     }
74 
getHealthStats()75     public HealthStats getHealthStats() {
76         if (mWriter != null) {
77             final Parcel parcel = Parcel.obtain();
78             mWriter.flattenToParcel(parcel);
79             parcel.setDataPosition(0);
80             mHealthStats = new HealthStats(parcel);
81             parcel.recycle();
82         }
83 
84         return mHealthStats;
85     }
86 }
87 
88