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      1 /*
      2  * Copyright (C) 2017 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.fuelgauge.anomaly;
     18 
     19 import android.content.Context;
     20 import android.os.Build;
     21 import android.support.annotation.VisibleForTesting;
     22 
     23 import com.android.internal.os.BatteryStatsHelper;
     24 import com.android.settings.fuelgauge.anomaly.action.AnomalyAction;
     25 import com.android.settings.fuelgauge.anomaly.action.ForceStopAction;
     26 import com.android.settings.fuelgauge.anomaly.action.LocationCheckAction;
     27 import com.android.settings.fuelgauge.anomaly.action.StopAndBackgroundCheckAction;
     28 import com.android.settings.fuelgauge.anomaly.checker.AnomalyDetector;
     29 import com.android.settings.fuelgauge.anomaly.checker.BluetoothScanAnomalyDetector;
     30 import com.android.settings.fuelgauge.anomaly.checker.WakeLockAnomalyDetector;
     31 import com.android.settings.fuelgauge.anomaly.checker.WakeupAlarmAnomalyDetector;
     32 
     33 import java.util.ArrayList;
     34 import java.util.List;
     35 
     36 /**
     37  * Utility class for anomaly detection
     38  */
     39 public class AnomalyUtils {
     40     private Context mContext;
     41     private static AnomalyUtils sInstance;
     42 
     43     @VisibleForTesting
     44     AnomalyUtils(Context context) {
     45         mContext = context.getApplicationContext();
     46     }
     47 
     48     public static AnomalyUtils getInstance(Context context) {
     49         if (sInstance == null) {
     50             sInstance = new AnomalyUtils(context);
     51         }
     52         return sInstance;
     53     }
     54 
     55     /**
     56      * Return the corresponding {@link AnomalyAction} according to
     57      * {@link com.android.settings.fuelgauge.anomaly.Anomaly}
     58      *
     59      * @return corresponding {@link AnomalyAction}, or null if cannot find it.
     60      */
     61     public AnomalyAction getAnomalyAction(Anomaly anomaly) {
     62         switch (anomaly.type) {
     63             case Anomaly.AnomalyType.WAKE_LOCK:
     64                 return new ForceStopAction(mContext);
     65             case Anomaly.AnomalyType.WAKEUP_ALARM:
     66                 if (anomaly.targetSdkVersion >= Build.VERSION_CODES.O
     67                         || (anomaly.targetSdkVersion < Build.VERSION_CODES.O
     68                                 && anomaly.backgroundRestrictionEnabled)) {
     69                     return new ForceStopAction(mContext);
     70                 } else {
     71                     return new StopAndBackgroundCheckAction(mContext);
     72                 }
     73             case Anomaly.AnomalyType.BLUETOOTH_SCAN:
     74                 return new LocationCheckAction(mContext);
     75             default:
     76                 return null;
     77         }
     78     }
     79 
     80     /**
     81      * Return the corresponding {@link AnomalyDetector} according to
     82      * {@link com.android.settings.fuelgauge.anomaly.Anomaly.AnomalyType}
     83      *
     84      * @return corresponding {@link AnomalyDetector}, or null if cannot find it.
     85      */
     86     public AnomalyDetector getAnomalyDetector(@Anomaly.AnomalyType int anomalyType) {
     87         switch (anomalyType) {
     88             case Anomaly.AnomalyType.WAKE_LOCK:
     89                 return new WakeLockAnomalyDetector(mContext);
     90             case Anomaly.AnomalyType.WAKEUP_ALARM:
     91                 return new WakeupAlarmAnomalyDetector(mContext);
     92             case Anomaly.AnomalyType.BLUETOOTH_SCAN:
     93                 return new BluetoothScanAnomalyDetector(mContext);
     94             default:
     95                 return null;
     96         }
     97     }
     98 
     99     /**
    100      * Detect whether application with {@code targetPackageName} has anomaly. When
    101      * {@code targetPackageName} is null, start detection among all the applications.
    102      *
    103      * @param batteryStatsHelper contains battery stats, used to detect anomaly
    104      * @param policy             contains configuration about anomaly check
    105      * @param targetPackageName  represents the app need to be detected
    106      * @return the list of anomalies
    107      */
    108     public List<Anomaly> detectAnomalies(BatteryStatsHelper batteryStatsHelper,
    109             AnomalyDetectionPolicy policy, String targetPackageName) {
    110         final List<Anomaly> anomalies = new ArrayList<>();
    111         for (@Anomaly.AnomalyType int type : Anomaly.ANOMALY_TYPE_LIST) {
    112             if (policy.isAnomalyDetectorEnabled(type)) {
    113                 anomalies.addAll(getAnomalyDetector(type).detectAnomalies(
    114                         batteryStatsHelper, targetPackageName));
    115             }
    116         }
    117 
    118         return anomalies;
    119     }
    120 
    121 }
    122