Build slice from indexed data in SliceProvider

Connect the SliceIndexing data to the SliceProvider,
such that a query to SliceProvider can build a Slice
via the indexed data from SlicesIndexingManager.

We take the key from the Uri supplied to the SettingSliceProvider
and find a potential matching row in the indexed data. The
matched data is then used to Build a slice for the caller.

Bug: 67996923
Test: robotests
Change-Id: If51bfd1a05c3f3817ae720554f95a98fc7b002e1

src/com/android/settings/slices/SliceBuilderUtils.java

@@ -0,0 +1,125 @@
+/*
+ * 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.slices;
+
+import static com.android.settings.slices.SettingsSliceProvider.EXTRA_SLICE_KEY;
+
+import android.app.PendingIntent;
+import android.content.Context;
+import android.content.Intent;
+import android.graphics.drawable.Icon;
+import android.text.TextUtils;
+
+import com.android.settings.SubSettings;
+import com.android.settings.core.BasePreferenceController;
+import com.android.settings.core.TogglePreferenceController;
+import com.android.settings.search.DatabaseIndexingUtils;
+
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
+
+import androidx.app.slice.Slice;
+import androidx.app.slice.builders.ListBuilder;
+import androidx.app.slice.builders.ListBuilder.RowBuilder;
+
+/**
+ * Utility class to build Slices objects and Preference Controllers based on the Database managed
+ * by {@link SlicesDatabaseHelper}
+ */
+public class SliceBuilderUtils {
+
+    private static final String TAG = "SliceBuilder";
+
+    /**
+     * Build a Slice from {@link SliceData}.
+     *
+     * @return a {@link Slice} based on the data provided by {@param sliceData}.
+     * Will build an {@link Intent} based Slice unless the Preference Controller name in
+     * {@param sliceData} is an inline controller.
+     */
+    public static Slice buildSlice(Context context, SliceData sliceData) {
+        final PendingIntent contentIntent = getContentIntent(context, sliceData);
+        final Icon icon = Icon.createWithResource(context, sliceData.getIconResource());
+        String summaryText = sliceData.getSummary();
+        String subtitleText = TextUtils.isEmpty(summaryText)
+                ? sliceData.getScreenTitle()
+                : summaryText;
+
+        RowBuilder builder = new RowBuilder(sliceData.getUri())
+                .setTitle(sliceData.getTitle())
+                .setTitleItem(icon)
+                .setSubtitle(subtitleText)
+                .setContentIntent(contentIntent);
+
+        BasePreferenceController controller = getPreferenceController(context, sliceData);
+
+        // TODO (b/71640747) Respect setting availability.
+        // TODO (b/71640678) Add dynamic summary text.
+
+        if (controller instanceof TogglePreferenceController) {
+            addToggleAction(context, builder, ((TogglePreferenceController) controller).isChecked(),
+                    sliceData.getKey());
+        }
+
+        return new ListBuilder(sliceData.getUri())
+                .addRow(builder)
+                .build();
+    }
+
+    /**
+     * Looks at the {@link SliceData#preferenceController} from {@param sliceData} and attempts to
+     * build a {@link BasePreferenceController}.
+     */
+    public static BasePreferenceController getPreferenceController(Context context,
+            SliceData sliceData) {
+        // TODO check for context-only controller first.
+        try {
+            Class<?> clazz = Class.forName(sliceData.getPreferenceController());
+            Constructor<?> preferenceConstructor = clazz.getConstructor(Context.class,
+                    String.class);
+            return (BasePreferenceController) preferenceConstructor.newInstance(
+                    new Object[]{context, sliceData.getKey()});
+        } catch (ClassNotFoundException | NoSuchMethodException | InstantiationException |
+                IllegalArgumentException | InvocationTargetException | IllegalAccessException e) {
+            throw new IllegalStateException(
+                    "Invalid preference controller: " + sliceData.getPreferenceController());
+        }
+    }
+
+    private static void addToggleAction(Context context, RowBuilder builder, boolean isChecked,
+            String key) {
+        PendingIntent actionIntent = getActionIntent(context,
+                SettingsSliceProvider.ACTION_TOGGLE_CHANGED, key);
+        builder.addToggle(actionIntent, isChecked);
+    }
+
+    private static PendingIntent getActionIntent(Context context, String action, String key) {
+        Intent intent = new Intent(action);
+        intent.setClass(context, SliceBroadcastReceiver.class);
+        intent.putExtra(EXTRA_SLICE_KEY, key);
+        return PendingIntent.getBroadcast(context, 0 /* requestCode */, intent,
+                PendingIntent.FLAG_CANCEL_CURRENT);
+    }
+
+    private static PendingIntent getContentIntent(Context context, SliceData sliceData) {
+        Intent intent = DatabaseIndexingUtils.buildSearchResultPageIntent(context,
+                sliceData.getFragmentClassName(), sliceData.getKey(), sliceData.getScreenTitle(),
+                0 /* TODO */);
+        intent.setClassName("com.android.settings", SubSettings.class.getName());
+        return PendingIntent.getActivity(context, 0 /* requestCode */, intent, 0 /* flags */);
+    }
+}