Let room generate kotlin

app/src/main/java/com/hippo/ehviewer/EhDB.kt

@@ -243,7 +243,9 @@ object EhDB {
     @Synchronized
     fun deleteQuickSearch(quickSearch: QuickSearch?) {
         val dao = db.quickSearchDao()
-        dao.delete(quickSearch)
+        if (quickSearch != null) {
+            dao.delete(quickSearch)
+        }
     }
 
     @Synchronized

app/src/main/java/com/hippo/ehviewer/dao/HistoryInfo.kt

@@ -12,18 +12,8 @@ class HistoryInfo() : BaseGalleryInfo() {
     var time: Long = 0
 
     // Trick: Use MODE for favoriteSlot
-    // Shadow its accessors
     @ColumnInfo(name = "MODE")
-    private val mode: Int = 0
-
-    fun getMode(): Int {
-        return favoriteSlot + 2
-    }
-
-    fun setMode(mode: Int) {
-        favoriteSlot = mode - 2
-    }
-    // Trick end
+    override var favoriteSlot: Int = -2
 
     constructor(galleryInfo: GalleryInfo) : this() {
         gid = galleryInfo.gid
@@ -39,4 +29,4 @@ class HistoryInfo() : BaseGalleryInfo() {
         simpleLanguage = galleryInfo.simpleLanguage
         favoriteSlot = galleryInfo.favoriteSlot
     }
-}
+}

app/src/main/java/com/hippo/ehviewer/dao/QuickSearchDao.kt

@@ -24,5 +24,5 @@ interface QuickSearchDao : BasicDao<QuickSearch> {
     override fun insert(t: QuickSearch): Long
 
     @Delete
-    fun delete(quickSearch: QuickSearch?)
+    fun delete(quickSearch: QuickSearch)
 }