StandardFileParserFactory

FileParserFactory.kt

/* The concept of the factory -> creates a Product */
interface FileParserFactory {
    fun createFromFileName(fileName: String): FileParser
}
 
/* Our specific Factory */
class StandardFileParserFactory : FileParserFactory {
    override fun createFromFileName(fileName: String) =
            when (fileName.substringAfterLast('.')) {
                "xml" -> XmlFileParser()
                "json" -> JsonFileParser()
                else -> throw Exception("I don't know how to deal with $fileName.")
            }
}