Modified Settings class to only represent internal Settings. Also, renamed it to DbSettings.

src/main/kotlin/de/fabianonline/telegram_backup/Database.kt

@@ -541,7 +541,13 @@ class Database private constructor(var client: TelegramClient) {
 		}
 	}
 	
-	fun settingsSetValue(key: String, value: String?) {
+	fun fetchSetting(key: String): String? {
+		val rs = stmt!!.executeQuery("SELECT value FROM settings WHERE key='${key}'")
+		rs.next()
+		return rs.getString(1)
+	}
+	
+	fun saveSetting(key: String, value: String?) {
 		val ps = conn!!.prepareStatement("INSERT OR REPLACE INTO settings (key, value) VALUES (?, ?)")
 		ps.setString(1, key)
 		if (value==null) {
@@ -552,16 +558,6 @@ class Database private constructor(var client: TelegramClient) {
 		ps.execute()
 	}
 	
-	fun settingsGetSettings(): Map<String, String?> {
-		val rs = stmt!!.executeQuery("SELECT key, value FROM settings")
-		val result = mutableMapOf<String, String?>()
-		while (rs.next()) {
-			result.set(rs.getString(1), rs.getString(2))
-		}
-		rs.close()
-		return result
-	}
-
 	fun getIdsFromQuery(query: String): LinkedList<Int> {
 		try {
 			val list = LinkedList<Int>()

src/main/kotlin/de/fabianonline/telegram_backup/Settings.kt

@@ -1,60 +1,12 @@
 package de.fabianonline.telegram_backup
 
-class Settings() {
-
-	val options = arrayOf(
-		Option("gmaps_api_key", "abc", "This contains the api key bla foo bar.")
-	)
+class DbSettings() {
+	private fun fetchValue(name: String): String? = Database.getInstance().fetchSetting(name)
+	private fun saveValue(name: String, value: String?) = Database.getInstance().saveSetting(name, value)
 	
-	init {
-		var all_settings = Database.getInstance().settingsGetSettings()
-		for ((key, value) in all_settings) {
-			val opt = options.find{it.key == key}
-			if (opt==null) throw IllegalArgumentException("Setting with key ${key} is unknown.")
-			if (value!=null) opt.value = value
-		}
-	}
-	
-	fun print() {
-		val modifiedSettings = options.filter{!it.isDefaultValue()}
-		val defaultSettings = options.filter{it.isDefaultValue()}
-		
-		if (modifiedSettings.count() > 0) {
-			println("Modified settings:")
-			modifiedSettings.forEach{it.print()}
-			println("\n")
-		}
-		
-		if (defaultSettings.count() > 0) {
-			println("Settings with default value:")
-			defaultSettings.forEach{it.print()}
-			println("\n")
-		}
-	}
-	
-	inner open class HiddenOption(val key: String, val default: String) {
-		var value: String? = null
-		
-		fun save() {
-			if (isDefaultValue()) {
-				Database.getInstance().settingsSetValue(key, null)
-			} else {
-				Database.getInstance().settingsSetValue(key, value)
-			}
-		}
-		
-		open fun print() {
-			println("%-30s %-30s".format(key, value))
-		}
-		
-		fun isDefaultValue(): Boolean = (value==null || value==default)
-			
-	}
-	inner class Option(key: String, default: String, val descr: String): HiddenOption(key, default) {
-		override fun print() {
-			println("%-30s %-30s %s".format(key, value, descr))
-		}
-	}
+	var pts: String?
+		get() = fetchValue("pts")
+		set(x: String?) = saveValue("pts", x)
 }