mirror of https://github.com/M66B/FairEmail.git
117 lines
4.2 KiB
Kotlin
117 lines
4.2 KiB
Kotlin
/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package androidx.room
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import android.content.Context
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import androidx.annotation.RestrictTo
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/**
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* Utility functions for Room.
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*/
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object Room {
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internal const val LOG_TAG = "ROOM"
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/**
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* The master table where room keeps its metadata information.
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*/
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const val MASTER_TABLE_NAME = RoomMasterTable.TABLE_NAME
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private const val CURSOR_CONV_SUFFIX = "_CursorConverter"
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@Suppress("UNCHECKED_CAST")
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@RestrictTo(RestrictTo.Scope.LIBRARY_GROUP)
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@JvmStatic
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fun <T, C> getGeneratedImplementation(
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klass: Class<C>,
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suffix: String
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): T {
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val fullPackage = klass.getPackage()!!.name
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val name: String = klass.canonicalName!!
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val postPackageName =
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if (fullPackage.isEmpty()) name else name.substring(fullPackage.length + 1)
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val implName = postPackageName.replace('.', '_') + suffix
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return try {
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val fullClassName = if (fullPackage.isEmpty()) {
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implName
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} else {
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"$fullPackage.$implName"
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}
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val aClass = Class.forName(
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fullClassName, true, klass.classLoader
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) as Class<T>
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aClass.getDeclaredConstructor().newInstance()
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} catch (e: ClassNotFoundException) {
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throw RuntimeException(
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"Cannot find implementation for ${klass.canonicalName}. $implName does not " +
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"exist"
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)
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} catch (e: IllegalAccessException) {
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throw RuntimeException(
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"Cannot access the constructor ${klass.canonicalName}"
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)
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} catch (e: InstantiationException) {
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throw RuntimeException(
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"Failed to create an instance of ${klass.canonicalName}"
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)
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}
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}
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/**
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* Creates a RoomDatabase.Builder for an in memory database. Information stored in an in memory
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* database disappears when the process is killed.
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* Once a database is built, you should keep a reference to it and re-use it.
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*
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* @param context The context for the database. This is usually the Application context.
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* @param klass The abstract class which is annotated with [Database] and extends
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* [RoomDatabase].
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* @param T The type of the database class.
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* @return A `RoomDatabaseBuilder<T>` which you can use to create the database.
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*/
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@JvmStatic
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fun <T : RoomDatabase> inMemoryDatabaseBuilder(
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context: Context,
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klass: Class<T>
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): RoomDatabase.Builder<T> {
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return RoomDatabase.Builder(context, klass, null)
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}
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/**
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* Creates a RoomDatabase.Builder for a persistent database. Once a database is built, you
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* should keep a reference to it and re-use it.
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*
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* @param context The context for the database. This is usually the Application context.
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* @param klass The abstract class which is annotated with [Database] and extends
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* [RoomDatabase].
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* @param name The name of the database file.
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* @param T The type of the database class.
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* @return A `RoomDatabaseBuilder<T>` which you can use to create the database.
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*/
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@JvmStatic
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fun <T : RoomDatabase> databaseBuilder(
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context: Context,
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klass: Class<T>,
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name: String?
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): RoomDatabase.Builder<T> {
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require(!name.isNullOrBlank()) {
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"Cannot build a database with null or empty name." +
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" If you are trying to create an in memory database, use Room" +
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".inMemoryDatabaseBuilder"
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}
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return RoomDatabase.Builder(context, klass, name)
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}
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}
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