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/*
* Copyright (C) 2014 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.indexer;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.os.Build;
import android.util.Log;
public class IndexDatabaseHelper extends SQLiteOpenHelper {
private static final String TAG = "IndexDatabaseHelper";
private static final String DATABASE_NAME = "search_index.db";
private static final int DATABASE_VERSION = 100;
public interface Tables {
public static final String TABLE_PREFS_INDEX = "prefs_index";
public static final String TABLE_META_INDEX = "meta_index";
}
public interface IndexColumns {
public static final String LOCALE = "locale";
public static final String DATA_RANK = "data_rank";
public static final String DATA_TITLE = "data_title";
public static final String DATA_SUMMARY = "data_summary";
public static final String DATA_KEYWORDS = "data_keywords";
public static final String FRAGMENT_NAME = "fragment_name";
public static final String FRAGMENT_TITLE = "fragment_title";
public static final String INTENT = "intent";
public static final String ICON = "icon";
}
public interface MetaColumns {
public static final String BUILD = "build";
}
private static final String CREATE_INDEX_TABLE =
"CREATE VIRTUAL TABLE " + Tables.TABLE_PREFS_INDEX + " USING fts4" +
"(" +
IndexColumns.LOCALE +
", " +
IndexColumns.DATA_RANK +
", " +
IndexColumns.DATA_TITLE +
", " +
IndexColumns.DATA_SUMMARY +
", " +
IndexColumns.DATA_KEYWORDS +
", " +
IndexColumns.FRAGMENT_NAME +
", " +
IndexColumns.FRAGMENT_TITLE +
", " +
IndexColumns.INTENT +
", " +
IndexColumns.ICON +
");";
private static final String CREATE_META_TABLE =
"CREATE TABLE " + Tables.TABLE_META_INDEX +
"(" +
MetaColumns.BUILD + " VARCHAR(32) NOT NULL" +
")";
private static final String INSERT_BUILD_VERSION =
"INSERT INTO " + Tables.TABLE_META_INDEX +
" VALUES ('" + Build.VERSION.INCREMENTAL + "');";
private static final String SELECT_BUILD_VERSION =
"SELECT " + MetaColumns.BUILD + " FROM " + Tables.TABLE_META_INDEX + " LIMIT 1;";
private static IndexDatabaseHelper sSingleton;
public static synchronized IndexDatabaseHelper getInstance(Context context) {
if (sSingleton == null) {
sSingleton = new IndexDatabaseHelper(context);
}
return sSingleton;
}
public IndexDatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
bootstrapDB(db);
}
private void bootstrapDB(SQLiteDatabase db) {
db.execSQL(CREATE_INDEX_TABLE);
db.execSQL(CREATE_META_TABLE);
db.execSQL(INSERT_BUILD_VERSION);
Log.i(TAG, "Bootstrapped database");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
private String getBuildVersion(SQLiteDatabase db) {
String version = null;
Cursor cursor = null;
try {
cursor = db.rawQuery(SELECT_BUILD_VERSION, null);
if (cursor.moveToFirst()) {
version = cursor.getString(0);
}
}
catch (Exception e) {
Log.e(TAG, "Cannot get build version from Index metadata");
}
finally {
if (cursor != null) {
cursor.close();
}
}
return version;
}
private void dropTables(SQLiteDatabase db) {
db.execSQL("DROP TABLE IF EXISTS " + Tables.TABLE_META_INDEX);
db.execSQL("DROP TABLE IF EXISTS " + Tables.TABLE_PREFS_INDEX);
}
@Override
public void onOpen(SQLiteDatabase db) {
super.onOpen(db);
if (!Build.VERSION.INCREMENTAL.equals(getBuildVersion(db))) {
Log.w(TAG, "Index needs to be rebuilt");
// We need to drop the tables and recreate them
dropTables(db);
bootstrapDB(db);
} else {
Log.i(TAG, "Index is fine");
}
}
}
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