code saving

app/src/main/kotlin/com/meloda/fast/database/Converters.kt

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+package com.meloda.fast.database
+
+import androidx.room.TypeConverter
+import com.google.gson.Gson
+import com.meloda.fast.api.model.VkMessage
+import com.meloda.fast.api.model.attachments.VkAttachment
+import org.json.JSONObject
+import java.util.stream.Collectors
+
+class Converters {
+
+    @TypeConverter
+    fun fromListVkMessageToString(messages: List<VkMessage>?): String? {
+        if (messages == null) return null
+
+        val string =
+            messages.map { fromVkMessageToString(it)!! }.stream()
+                .collect(Collectors.joining("fastkruta228355"))
+
+        return string
+    }
+
+    @TypeConverter
+    fun fromStringToListVkMessage(string: String?): List<VkMessage>? {
+        if (string == null) return null
+
+        if (string.contains("fastkruta228355")) {
+            val messages =
+                string.split("fastkruta228355").map { fromStringToVkMessage(it)!! }
+            return messages
+        }
+
+
+        val message = fromStringToVkMessage(string)!!
+
+        return listOf(message)
+    }
+
+    @TypeConverter
+    fun fromVkMessageToString(message: VkMessage?): String? {
+        if (message == null) return null
+
+        return Gson().toJson(message)
+    }
+
+    @TypeConverter
+    fun fromStringToVkMessage(string: String?): VkMessage? {
+        if (string == null) return null
+
+        return Gson().fromJson(string, VkMessage::class.java)
+    }
+
+    @TypeConverter
+    fun fromListVkAttachmentToString(attachments: List<VkAttachment>?): String? {
+        if (attachments == null) return null
+
+        val string =
+            attachments.map { fromVkAttachmentToString(it)!! }.stream()
+                .collect(Collectors.joining("fastkruta228355"))
+
+        return string
+    }
+
+    @TypeConverter
+    fun fromStringToListVkAttachment(string: String?): List<VkAttachment>? {
+        if (string == null) return null
+
+        if (string.contains("fastkruta228355")) {
+            val attachments =
+                string.split("fastkruta228355").map { fromStringToVkAttachment(it)!! }
+            return attachments
+        }
+
+
+        val attachment = fromStringToVkAttachment(string)!!
+
+        return listOf(attachment)
+    }
+
+    @TypeConverter
+    fun fromVkAttachmentToString(attachment: VkAttachment?): String? {
+        if (attachment == null) return null
+
+        return Gson().toJson(attachment)
+    }
+
+    @TypeConverter
+    fun fromStringToVkAttachment(string: String?): VkAttachment? {
+        if (string == null) return null
+
+        val className = JSONObject(string).optString("className")
+
+        return Gson().fromJson(string, Class.forName(className)) as VkAttachment?
+    }
+}