Convert GalleryDetailParser to kotlin

app/src/main/java/com/hippo/ehviewer/client/EhEngine.kt

@@ -323,7 +323,7 @@ object EhEngine {
                 if (html != null) {
                     application.showEventPane(html)
                 }
-                return GalleryDetailParser.parse(body)
+                return GalleryDetailParser.parse(body!!)
             }
         } catch (e: Throwable) {
             ExceptionUtils.throwIfFatal(e)
@@ -348,8 +348,8 @@ object EhEngine {
                 headers = response.headers
                 body = response.body.string()
                 return Pair.create(
-                    GalleryDetailParser.parsePreviewSet(body),
-                    GalleryDetailParser.parsePreviewPages(body)
+                    GalleryDetailParser.parsePreviewSet(body!!),
+                    GalleryDetailParser.parsePreviewPages(body!!)
                 )
             }
         } catch (e: Throwable) {

app/src/main/java/com/hippo/ehviewer/client/data/GalleryDetail.kt

@@ -15,6 +15,7 @@
  */
 package com.hippo.ehviewer.client.data
 
+import com.hippo.ehviewer.client.data.GalleryInfo.Companion.S_LANGS
 import kotlinx.parcelize.IgnoredOnParcel
 import kotlinx.parcelize.Parcelize
 
@@ -74,4 +75,30 @@ class GalleryDetail(
     @IgnoredOnParcel
     @JvmField
     var previewSet: PreviewSet? = null,
-) : AbstractGalleryInfo by galleryInfo, GalleryInfo
+) : AbstractGalleryInfo by galleryInfo, GalleryInfo {
+    override fun generateSLang() {
+        val index = LANGUAGES.indexOf(language)
+        if (index != -1) {
+            simpleLanguage = S_LANGS[index]
+        }
+    }
+
+    companion object {
+        private val LANGUAGES = arrayOf(
+            "English",
+            "Chinese",
+            "Spanish",
+            "Korean",
+            "Russian",
+            "French",
+            "Portuguese",
+            "Thai",
+            "German",
+            "Italian",
+            "Vietnamese",
+            "Polish",
+            "Hungarian",
+            "Dutch"
+        )
+    }
+}

app/src/main/java/com/hippo/util/MutableBoolean.java

@@ -1,26 +0,0 @@
-/*
- * Copyright 2019 Hippo Seven
- *
- * 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.hippo.util;
-
-public class MutableBoolean {
-
-    public boolean value;
-
-    public MutableBoolean(boolean value) {
-        this.value = value;
-    }
-}