Reorganize notification Settings classes

The notification package was getting too big.

Test: make -j64 RunSettingsRoboTests
Fixes: 145224451
Change-Id: I25ba82f42f7a137d8adcce72dcf8089d0e018bdc

src/com/android/settings/notification/app/NotificationPreferenceController.java

@@ -0,0 +1,165 @@
+/*
+ * 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.notification.app;
+
+import static android.app.NotificationManager.IMPORTANCE_NONE;
+
+import android.annotation.Nullable;
+import android.app.NotificationChannel;
+import android.app.NotificationChannelGroup;
+import android.app.NotificationManager;
+import android.content.Context;
+import android.content.pm.PackageManager;
+import android.os.UserManager;
+import android.util.Log;
+
+import androidx.preference.Preference;
+
+import com.android.settings.notification.NotificationBackend;
+import com.android.settingslib.RestrictedLockUtils;
+import com.android.settingslib.core.AbstractPreferenceController;
+
+import java.util.Objects;
+
+/**
+ * Parent class for preferences appearing on notification setting pages at the app,
+ * notification channel group, or notification channel level.
+ */
+public abstract class NotificationPreferenceController extends AbstractPreferenceController {
+    private static final String TAG = "ChannelPrefContr";
+    @Nullable
+    protected NotificationChannel mChannel;
+    @Nullable
+    protected NotificationChannelGroup mChannelGroup;
+    protected RestrictedLockUtils.EnforcedAdmin mAdmin;
+    protected NotificationBackend.AppRow mAppRow;
+    protected final NotificationManager mNm;
+    protected final NotificationBackend mBackend;
+    protected final Context mContext;
+    protected final UserManager mUm;
+    protected final PackageManager mPm;
+    protected Preference mPreference;
+
+    public NotificationPreferenceController(Context context, NotificationBackend backend) {
+        super(context);
+        mContext = context;
+        mNm = (NotificationManager) mContext.getSystemService(Context.NOTIFICATION_SERVICE);
+        mBackend = backend;
+        mUm = (UserManager) mContext.getSystemService(Context.USER_SERVICE);
+        mPm = mContext.getPackageManager();
+    }
+
+    /**
+     * Returns true if field's parent object is not blocked.
+     */
+    @Override
+    public boolean isAvailable() {
+        if (mAppRow == null) {
+            return false;
+        }
+        if (mAppRow.banned) {
+            return false;
+        }
+        if (mChannelGroup != null) {
+            if (mChannelGroup.isBlocked()) {
+                return false;
+            }
+        }
+        if (mChannel != null) {
+            return mChannel.getImportance() != IMPORTANCE_NONE;
+        }
+        return true;
+    }
+
+    protected void onResume(NotificationBackend.AppRow appRow,
+            @Nullable NotificationChannel channel, @Nullable NotificationChannelGroup group,
+            RestrictedLockUtils.EnforcedAdmin admin) {
+        mAppRow = appRow;
+        mChannel = channel;
+        mChannelGroup = group;
+        mAdmin = admin;
+    }
+
+    protected boolean checkCanBeVisible(int minImportanceVisible) {
+        if (mChannel == null) {
+            Log.w(TAG, "No channel");
+            return false;
+        }
+
+        int importance = mChannel.getImportance();
+        if (importance == NotificationManager.IMPORTANCE_UNSPECIFIED) {
+            return true;
+        }
+        return importance >= minImportanceVisible;
+    }
+
+    protected void saveChannel() {
+        if (mChannel != null && mAppRow != null) {
+            mBackend.updateChannel(mAppRow.pkg, mAppRow.uid, mChannel);
+        }
+    }
+
+    protected boolean isChannelBlockable() {
+        return isChannelBlockable(mChannel);
+    }
+
+    protected boolean isChannelBlockable(NotificationChannel channel) {
+        if (channel != null && mAppRow != null) {
+            if (channel.isImportanceLockedByCriticalDeviceFunction()
+                    || channel.isImportanceLockedByOEM()) {
+                return channel.getImportance() == IMPORTANCE_NONE;
+            }
+
+            return channel.isBlockableSystem() || !mAppRow.systemApp
+                    || channel.getImportance() == IMPORTANCE_NONE;
+        }
+        return false;
+    }
+
+    protected boolean isChannelConfigurable(NotificationChannel channel) {
+        if (channel != null && mAppRow != null) {
+            return !channel.isImportanceLockedByOEM();
+        }
+        return false;
+    }
+
+    protected boolean isChannelGroupBlockable() {
+        return isChannelGroupBlockable(mChannelGroup);
+    }
+
+    protected boolean isChannelGroupBlockable(NotificationChannelGroup group) {
+        if (group != null && mAppRow != null) {
+            if (!mAppRow.systemApp) {
+                return true;
+            }
+
+            return group.isBlocked();
+        }
+        return false;
+    }
+
+    protected boolean hasValidGroup() {
+        return mChannelGroup != null;
+    }
+
+    protected final boolean isDefaultChannel() {
+        if (mChannel == null) {
+            return false;
+        }
+        return Objects.equals(NotificationChannel.DEFAULT_CHANNEL_ID, mChannel.getId());
+    }
+}