Remove some logic around old legacy backup versions + minor optimizations

app/src/main/java/eu/kanade/tachiyomi/data/backup/legacy/LegacyBackupManager.kt

@@ -53,30 +53,14 @@ import kotlin.math.max
 
 class LegacyBackupManager(context: Context, version: Int = CURRENT_VERSION) : AbstractBackupManager(context) {
 
-    var parserVersion: Int = version
-        private set
-
-    var parser: Gson = initParser()
-
-    /**
-     * Set version of parser
-     *
-     * @param version version of parser
-     */
-    internal fun setVersion(version: Int) {
-        this.parserVersion = version
-        parser = initParser()
-    }
-
-    private fun initParser(): Gson = when (parserVersion) {
-        2 ->
-            GsonBuilder()
-                .registerTypeAdapter<MangaImpl>(MangaTypeAdapter.build())
-                .registerTypeHierarchyAdapter<ChapterImpl>(ChapterTypeAdapter.build())
-                .registerTypeAdapter<CategoryImpl>(CategoryTypeAdapter.build())
-                .registerTypeAdapter<DHistory>(HistoryTypeAdapter.build())
-                .registerTypeHierarchyAdapter<TrackImpl>(TrackTypeAdapter.build())
-                .create()
+    val parser: Gson = when (version) {
+        2 -> GsonBuilder()
+            .registerTypeAdapter<MangaImpl>(MangaTypeAdapter.build())
+            .registerTypeHierarchyAdapter<ChapterImpl>(ChapterTypeAdapter.build())
+            .registerTypeAdapter<CategoryImpl>(CategoryTypeAdapter.build())
+            .registerTypeAdapter<DHistory>(HistoryTypeAdapter.build())
+            .registerTypeHierarchyAdapter<TrackImpl>(TrackTypeAdapter.build())
+            .create()
         else -> throw Exception("Unknown backup version")
     }
 
@@ -308,7 +292,7 @@ class LegacyBackupManager(context: Context, version: Int = CURRENT_VERSION) : Ab
      */
     internal fun restoreCategoriesForManga(manga: Manga, categories: List<String>) {
         val dbCategories = databaseHelper.getCategories().executeAsBlocking()
-        val mangaCategoriesToUpdate = mutableListOf<MangaCategory>()
+        val mangaCategoriesToUpdate = ArrayList<MangaCategory>(categories.size)
         for (backupCategoryStr in categories) {
             for (dbCategory in dbCategories) {
                 if (backupCategoryStr == dbCategory.name) {
@@ -332,7 +316,7 @@ class LegacyBackupManager(context: Context, version: Int = CURRENT_VERSION) : Ab
      */
     internal fun restoreHistoryForManga(history: List<DHistory>) {
         // List containing history to be updated
-        val historyToBeUpdated = mutableListOf<History>()
+        val historyToBeUpdated = ArrayList<History>(history.size)
         for ((url, lastRead) in history) {
             val dbHistory = databaseHelper.getHistoryByChapterUrl(url).executeAsBlocking()
             // Check if history already in database and update
@@ -361,14 +345,14 @@ class LegacyBackupManager(context: Context, version: Int = CURRENT_VERSION) : Ab
      * @param tracks the track list to restore.
      */
     internal fun restoreTrackForManga(manga: Manga, tracks: List<Track>) {
-        // Fix foreign keys with the current manga id
-        tracks.map { it.manga_id = manga.id!! }
-
         // Get tracks from database
         val dbTracks = databaseHelper.getTracks(manga).executeAsBlocking()
-        val trackToUpdate = mutableListOf<Track>()
+        val trackToUpdate = ArrayList<Track>(tracks.size)
 
         tracks.forEach { track ->
+            // Fix foreign keys with the current manga id
+            track.manga_id = manga.id!!
+
             val service = trackManager.getService(track.sync_id)
             if (service != null && service.isLogged) {
                 var isInDatabase = false
@@ -423,12 +407,13 @@ class LegacyBackupManager(context: Context, version: Int = CURRENT_VERSION) : Ab
                 chapter.copyFrom(dbChapter)
                 break
             }
-        }
-        // Filter the chapters that couldn't be found.
-        chapters.filter { it.id != null }
-        chapters.map { it.manga_id = manga.id }
 
-        updateChapters(chapters)
+            chapter.manga_id = manga.id
+        }
+
+        // Filter the chapters that couldn't be found.
+        updateChapters(chapters.filter { it.id != null })
+
         return true
     }
 }

app/src/test/java/eu/kanade/tachiyomi/data/backup/BackupTest.kt

@@ -68,7 +68,7 @@ class BackupTest {
     fun setup() {
         app = RuntimeEnvironment.application
         context = app.applicationContext
-        legacyBackupManager = LegacyBackupManager(context)
+        legacyBackupManager = LegacyBackupManager(context, 2)
         db = legacyBackupManager.databaseHelper
 
         // Mock the source manager
@@ -84,6 +84,8 @@ class BackupTest {
 
         root.add(Backup.MANGAS, mangaEntries)
         root.add(Backup.CATEGORIES, categoryEntries)
+
+        clearJson()
     }
 
     /**
@@ -91,9 +93,6 @@ class BackupTest {
      */
     @Test
     fun testRestoreEmptyCategory() {
-        // Initialize json with version 2
-        initializeJsonTest(2)
-
         // Create backup of empty database
         legacyBackupManager.backupCategories(categoryEntries)
 
@@ -110,9 +109,6 @@ class BackupTest {
      */
     @Test
     fun testRestoreSingleCategory() {
-        // Initialize json with version 2
-        initializeJsonTest(2)
-
         // Create category and add to json
         val category = addSingleCategory("category")
 
@@ -130,9 +126,6 @@ class BackupTest {
      */
     @Test
     fun testRestoreMultipleCategories() {
-        // Initialize json with version 2
-        initializeJsonTest(2)
-
         // Create category and add to json
         val category = addSingleCategory("category")
         val category2 = addSingleCategory("category2")
@@ -161,9 +154,6 @@ class BackupTest {
      */
     @Test
     fun testRestoreManga() {
-        // Initialize json with version 2
-        initializeJsonTest(2)
-
         // Add manga to database
         val manga = getSingleManga("One Piece")
         manga.viewer = 3
@@ -227,9 +217,6 @@ class BackupTest {
      */
     @Test
     fun testRestoreChapters() {
-        // Initialize json with version 2
-        initializeJsonTest(2)
-
         // Insert manga
         val manga = getSingleManga("One Piece")
         manga.id = legacyBackupManager.databaseHelper.insertManga(manga).executeAsBlocking().insertedId()
@@ -266,9 +253,6 @@ class BackupTest {
      */
     @Test
     fun restoreHistoryForManga() {
-        // Initialize json with version 2
-        initializeJsonTest(2)
-
         val manga = getSingleManga("One Piece")
         manga.id = legacyBackupManager.databaseHelper.insertManga(manga).executeAsBlocking().insertedId()
 
@@ -300,9 +284,6 @@ class BackupTest {
      */
     @Test
     fun restoreTrackForManga() {
-        // Initialize json with version 2
-        initializeJsonTest(2)
-
         // Create mangas
         val manga = getSingleManga("One Piece")
         val manga2 = getSingleManga("Bleach")
@@ -359,31 +340,26 @@ class BackupTest {
         assertThat(trackDB[0].last_chapter_read).isEqualTo(10)
     }
 
-    fun clearJson() {
+    private fun clearJson() {
         root = JsonObject()
         information = JsonObject()
         mangaEntries = JsonArray()
         categoryEntries = JsonArray()
     }
 
-    fun initializeJsonTest(version: Int) {
-        clearJson()
-        legacyBackupManager.setVersion(version)
-    }
-
-    fun addSingleCategory(name: String): Category {
+    private fun addSingleCategory(name: String): Category {
         val category = Category.create(name)
         val catJson = legacyBackupManager.parser.toJsonTree(category)
         categoryEntries.add(catJson)
         return category
     }
 
-    fun clearDatabase() {
+    private fun clearDatabase() {
         db.deleteMangas().executeAsBlocking()
         db.deleteHistory().executeAsBlocking()
     }
 
-    fun getSingleHistory(chapter: Chapter): DHistory {
+    private fun getSingleHistory(chapter: Chapter): DHistory {
         return DHistory(chapter.url, 1000)
     }