Performing auto-migration when there are no blocked nums

The previous behavior was such that users that had no numbers in the
Dialer block list still had to go through steps to migrate to the
framework blocking solution, even though there was nothing to
migrate. This changes add logic to check if the blocked list is
empty, if that's the cause the user is automatically switched to the
framework blocking solution. This check is performed only once on app
startup.

Fixes: 27704106
Change-Id: I32482003279ef2070c1ebd8b801acf637c48ba8c
(cherry picked from commit ee4e15b40f0d20b5f04f3569efa12c0d26a38645)

4 files changed, 117 insertions, 3 deletions

diff --git a/src/com/android/dialer/DialerApplication.java b/src/com/android/dialer/DialerApplication.java
index 189c68221..1a0497bb9 100644
--- a/src/com/android/dialer/DialerApplication.java
+++ b/src/com/android/dialer/DialerApplication.java
@@ -19,11 +19,13 @@ package com.android.dialer;
 import android.app.Application;
 import android.content.Context;
 import android.os.Trace;
+import android.preference.PreferenceManager;
 import android.support.annotation.Nullable;
 
 import com.android.contacts.common.extensions.ExtensionsFactory;
 import com.android.contacts.common.testing.NeededForTesting;
-import com.android.dialer.compat.FilteredNumberCompat;
+import com.android.dialer.database.FilteredNumberAsyncQueryHandler;
+import com.android.dialer.filterednumber.BlockedNumbersAutoMigrator;
 
 public class DialerApplication extends Application {
 
@@ -39,6 +41,8 @@ public class DialerApplication extends Application {
         Trace.beginSection(TAG + " ExtensionsFactory initialization");
         ExtensionsFactory.init(getApplicationContext());
         Trace.endSection();
+        new BlockedNumbersAutoMigrator(PreferenceManager.getDefaultSharedPreferences(this),
+                new FilteredNumberAsyncQueryHandler(getContentResolver())).autoMigrate();
         Trace.endSection();
     }
 
diff --git a/src/com/android/dialer/compat/FilteredNumberCompat.java b/src/com/android/dialer/compat/FilteredNumberCompat.java
index 91563dc0d..008782d86 100644
--- a/src/com/android/dialer/compat/FilteredNumberCompat.java
+++ b/src/com/android/dialer/compat/FilteredNumberCompat.java
@@ -16,6 +16,7 @@
 
 package com.android.dialer.compat;
 
+import com.google.common.base.MoreObjects;
 import com.google.common.base.Preconditions;
 
 import android.app.FragmentManager;
@@ -67,6 +68,8 @@ public class FilteredNumberCompat {
 
     private static Boolean isEnabledForTest;
 
+    private static Context contextForTest;
+
     /**
      * @return The column name for ID in the filtered number database.
      */
@@ -154,7 +157,8 @@ public class FilteredNumberCompat {
      */
     @NeededForTesting
     public static void setHasMigratedToNewBlocking(boolean hasMigrated) {
-        PreferenceManager.getDefaultSharedPreferences(DialerApplication.getContext()).edit()
+        PreferenceManager.getDefaultSharedPreferences(
+                MoreObjects.firstNonNull(contextForTest, DialerApplication.getContext())).edit()
                 .putBoolean(HAS_MIGRATED_TO_NEW_BLOCKING_KEY, hasMigrated).apply();
     }
 
@@ -163,6 +167,11 @@ public class FilteredNumberCompat {
         isEnabledForTest = isEnabled;
     }
 
+    @NeededForTesting
+    public static void setContextForTest(Context context) {
+        contextForTest = context;
+    }
+
     /**
      * Gets the content {@link Uri} for number filtering.
      *
diff --git a/src/com/android/dialer/database/FilteredNumberAsyncQueryHandler.java b/src/com/android/dialer/database/FilteredNumberAsyncQueryHandler.java
index 52ef49ac0..68a2e85d5 100644
--- a/src/com/android/dialer/database/FilteredNumberAsyncQueryHandler.java
+++ b/src/com/android/dialer/database/FilteredNumberAsyncQueryHandler.java
@@ -125,7 +125,7 @@ public class FilteredNumberAsyncQueryHandler extends AsyncQueryHandler {
                 null, null, null);
     }
 
-    public final void hasBlockedNumbers(final OnHasBlockedNumbersListener listener) {
+    public void hasBlockedNumbers(final OnHasBlockedNumbersListener listener) {
         startQuery(NO_TOKEN,
                 new Listener() {
                     @Override
diff --git a/src/com/android/dialer/filterednumber/BlockedNumbersAutoMigrator.java b/src/com/android/dialer/filterednumber/BlockedNumbersAutoMigrator.java
new file mode 100644
index 000000000..ed0faabbe
--- /dev/null
+++ b/src/com/android/dialer/filterednumber/BlockedNumbersAutoMigrator.java
@@ -0,0 +1,101 @@
+/*
+ * Copyright (C) 2016 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.dialer.filterednumber;
+
+import com.google.common.base.Preconditions;
+
+import android.content.SharedPreferences;
+import android.util.Log;
+
+import com.android.dialer.compat.FilteredNumberCompat;
+import com.android.dialer.database.FilteredNumberAsyncQueryHandler;
+import com.android.dialer.database.FilteredNumberAsyncQueryHandler.OnHasBlockedNumbersListener;
+
+/**
+ * Class responsible for checking if the user can be auto-migrated to {@link
+ * android.provider.BlockedNumberContract} blocking. In order for this to happen, the user cannot
+ * have any numbers that are blocked in the Dialer solution.
+ */
+public class BlockedNumbersAutoMigrator {
+
+    private static final String TAG = "BlockedNumbersAuto";
+
+    private static final String HAS_CHECKED_AUTO_MIGRATE_KEY = "checkedAutoMigrate";
+
+    private final SharedPreferences sharedPreferences;
+    private final FilteredNumberAsyncQueryHandler queryHandler;
+
+    /**
+     * Constructs the BlockedNumbersAutoMigrator with the given {@link SharedPreferences} and {@link
+     * FilteredNumberAsyncQueryHandler}.
+     *
+     * @param sharedPreferences The SharedPreferences used to persist information.
+     * @param queryHandler The FilteredNumberAsyncQueryHandler used to determine if there are
+     * blocked numbers.
+     * @throws NullPointerException if sharedPreferences or queryHandler are null.
+     */
+    public BlockedNumbersAutoMigrator(SharedPreferences sharedPreferences,
+            FilteredNumberAsyncQueryHandler queryHandler) {
+        this.sharedPreferences = Preconditions.checkNotNull(sharedPreferences);
+        this.queryHandler = Preconditions.checkNotNull(queryHandler);
+    }
+
+    /**
+     * Attempts to perform the auto-migration. Auto-migration will only be attempted once and can be
+     * performed only when the user has no blocked numbers. As a result of this method, the user
+     * will be migrated to the framework blocking solution, as determined by {@link
+     * FilteredNumberCompat#hasMigratedToNewBlocking()}.
+     */
+    public void autoMigrate() {
+        if (!shouldAttemptAutoMigrate()) {
+            return;
+        }
+
+        Log.i(TAG, "Attempting to auto-migrate.");
+        queryHandler.hasBlockedNumbers(new OnHasBlockedNumbersListener() {
+            @Override
+            public void onHasBlockedNumbers(boolean hasBlockedNumbers) {
+                if (hasBlockedNumbers) {
+                    Log.i(TAG, "Not auto-migrating: blocked numbers exist.");
+                    return;
+                }
+                Log.i(TAG, "Auto-migrating: no blocked numbers.");
+                FilteredNumberCompat.setHasMigratedToNewBlocking(true);
+            }
+        });
+    }
+
+    private boolean shouldAttemptAutoMigrate() {
+        if (sharedPreferences.contains(HAS_CHECKED_AUTO_MIGRATE_KEY)) {
+            Log.d(TAG, "Not attempting auto-migrate: already checked once.");
+            return false;
+        }
+        Log.i(TAG, "Updating state as already checked for auto-migrate.");
+        sharedPreferences.edit().putBoolean(HAS_CHECKED_AUTO_MIGRATE_KEY, true).apply();
+
+        if (!FilteredNumberCompat.canUseNewFiltering()) {
+            Log.i(TAG, "Not attempting auto-migrate: not available.");
+            return false;
+        }
+
+        if (FilteredNumberCompat.hasMigratedToNewBlocking()) {
+            Log.i(TAG, "Not attempting auto-migrate: already migrated.");
+            return false;
+        }
+        return true;
+    }
+}