Add AnomalyDetectionPolicy

AnomalyDetectionPolicy contains all the knobs for anomaly detection.

Since Robolectric doesn't support KeyValueListParser, this cl creates
KeyValueListParserWrapper so we could mock it and test
AnomalyDetectionPolicy

Bug: 36924669
Test: RunSettingsRoboTests
Change-Id: I71138f85d37a21b5c4c9c806a41e00a4aa924f5f

src/com/android/settings/fuelgauge/anomaly/AnomalyDetectionPolicy.java

@@ -0,0 +1,88 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.fuelgauge.anomaly;
+
+import android.content.Context;
+import android.provider.Settings;
+import android.support.annotation.VisibleForTesting;
+import android.text.format.DateUtils;
+import android.util.KeyValueListParser;
+import android.util.Log;
+
+/**
+ * Class to store the policy for anomaly detection, which comes from
+ * {@link android.provider.Settings.Global}
+ */
+public class AnomalyDetectionPolicy {
+    public static final String TAG = "AnomalyDetectionPolicy";
+
+    @VisibleForTesting
+    static final String KEY_ANOMALY_DETECTION_ENABLED = "anomaly_detection_enabled";
+    @VisibleForTesting
+    static final String KEY_WAKELOCK_DETECTION_ENABLED = "wakelock_enabled";
+    @VisibleForTesting
+    static final String KEY_WAKELOCK_THRESHOLD = "wakelock_threshold";
+
+    /**
+     * {@code true} if general anomaly detection is enabled
+     *
+     * @see Settings.Global#ANOMALY_DETECTION_CONSTANTS
+     * @see #KEY_ANOMALY_DETECTION_ENABLED
+     */
+    public final boolean anomalyDetectionEnabled;
+
+    /**
+     * {@code true} if wakelock anomaly detection is enabled
+     *
+     * @see Settings.Global#ANOMALY_DETECTION_CONSTANTS
+     * @see #KEY_WAKELOCK_DETECTION_ENABLED
+     */
+    public final boolean wakeLockDetectionEnabled;
+
+    /**
+     * Threshold for wakelock time in milli seconds
+     *
+     * @see Settings.Global#ANOMALY_DETECTION_CONSTANTS
+     * @see #KEY_WAKELOCK_THRESHOLD
+     */
+    public final long wakeLockThreshold;
+
+    private final KeyValueListParserWrapper mParserWrapper;
+
+    public AnomalyDetectionPolicy(Context context) {
+        this(context, new KeyValueListParserWrapperImpl(new KeyValueListParser(',')));
+    }
+
+    @VisibleForTesting
+    AnomalyDetectionPolicy(Context context, KeyValueListParserWrapper parserWrapper) {
+        mParserWrapper = parserWrapper;
+        final String value = Settings.Global.getString(context.getContentResolver(),
+                Settings.Global.ANOMALY_DETECTION_CONSTANTS);
+
+        try {
+            mParserWrapper.setString(value);
+        } catch (IllegalArgumentException e) {
+            Log.e(TAG, "Bad anomaly detection constants");
+        }
+
+        anomalyDetectionEnabled = mParserWrapper.getBoolean(KEY_ANOMALY_DETECTION_ENABLED, true);
+        wakeLockDetectionEnabled = mParserWrapper.getBoolean(KEY_WAKELOCK_DETECTION_ENABLED, true);
+        wakeLockThreshold = mParserWrapper.getLong(KEY_WAKELOCK_THRESHOLD,
+                DateUtils.HOUR_IN_MILLIS);
+    }
+
+}

src/com/android/settings/fuelgauge/anomaly/KeyValueListParserWrapper.java

@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.fuelgauge.anomaly;
+
+import android.util.KeyValueListParser;
+
+/**
+ * This interface replicates a subset of the {@link KeyValueListParser}. The interface
+ * exists so that we can use a thin wrapper around the PM in production code and a mock in tests.
+ * We cannot directly mock or shadow the {@link KeyValueListParser}, because some of the methods
+ * we rely on are newer than the API version supported by Robolectric.
+ */
+public interface KeyValueListParserWrapper {
+
+    /**
+     * Get real {@link KeyValueListParser}
+     */
+    KeyValueListParser getKeyValueListParser();
+
+    /**
+     * Resets the parser with a new string to parse. The string is expected to be in the following
+     * format:
+     * <pre>key1=value,key2=value,key3=value</pre>
+     *
+     * where the delimiter is a comma.
+     *
+     * @param str the string to parse.
+     * @throws IllegalArgumentException if the string is malformed.
+     */
+    void setString(String str) throws IllegalArgumentException;
+
+    /**
+     * Get the value for key as a boolean.
+     * @param key The key to lookup.
+     * @param defaultValue The value to return if the key was not found.
+     * @return the string value associated with the key.
+     */
+    boolean getBoolean(String key, boolean defaultValue);
+
+    /**
+     * Get the value for key as a long.
+     * @param key The key to lookup.
+     * @param defaultValue The value to return if the key was not found, or the value was not a
+     *                     long.
+     * @return the long value associated with the key.
+     */
+    long getLong(String key, long defaultValue);
+}

src/com/android/settings/fuelgauge/anomaly/KeyValueListParserWrapperImpl.java

@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.fuelgauge.anomaly;
+
+import android.util.KeyValueListParser;
+
+/**
+ * Impl of {@link KeyValueListParser}
+ */
+public class KeyValueListParserWrapperImpl implements KeyValueListParserWrapper {
+    private KeyValueListParser mParser;
+
+    public KeyValueListParserWrapperImpl(KeyValueListParser parser) {
+        mParser = parser;
+    }
+
+    @Override
+    public KeyValueListParser getKeyValueListParser() {
+        return mParser;
+    }
+
+    @Override
+    public void setString(String str) throws IllegalArgumentException {
+        mParser.setString(str);
+    }
+
+    @Override
+    public boolean getBoolean(String key, boolean defaultValue) {
+        return mParser.getBoolean(key, defaultValue);
+    }
+
+    @Override
+    public long getLong(String key, long defaultValue) {
+        return mParser.getLong(key, defaultValue);
+    }
+}