Log optimization mode for app usage in BatteryUsageSlot.

Bug: 335374932
Test: atest ConvertUtilsTest
Change-Id: Icf86b9bee58b3b70d99e166d9fce0dfd7e30dea3

src/com/android/settings/fuelgauge/batteryusage/BatteryOptimizationModeCache.java

@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2024 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.batteryusage;
+
+import android.content.Context;
+import android.util.ArrayMap;
+
+import androidx.annotation.VisibleForTesting;
+
+import com.android.settings.fuelgauge.BatteryOptimizeUtils;
+import com.android.settingslib.fuelgauge.PowerAllowlistBackend;
+
+import java.util.Map;
+
+/** A cache to log battery optimization mode of an app */
+final class BatteryOptimizationModeCache {
+    private static final String TAG = "BatteryOptimizationModeCache";
+
+    @VisibleForTesting final Map<Integer, BatteryOptimizationMode> mBatteryOptimizeModeCacheMap;
+
+    private final Context mContext;
+
+    BatteryOptimizationModeCache(final Context context) {
+        mContext = context;
+        mBatteryOptimizeModeCacheMap = new ArrayMap<>();
+        PowerAllowlistBackend.getInstance(mContext).refreshList();
+    }
+
+    BatteryOptimizationMode getBatteryOptimizeMode(final int uid, final String packageName) {
+        if (!mBatteryOptimizeModeCacheMap.containsKey(uid)) {
+            final BatteryOptimizeUtils batteryOptimizeUtils =
+                    new BatteryOptimizeUtils(mContext, uid, packageName);
+            mBatteryOptimizeModeCacheMap.put(
+                    uid,
+                    BatteryOptimizationMode.forNumber(
+                            batteryOptimizeUtils.getAppOptimizationMode(/* refreshList= */ false)));
+        }
+        return mBatteryOptimizeModeCacheMap.get(uid);
+    }
+}