Created
October 19, 2023 13:59
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| sealed interface Item { | |
| val weight: Int | |
| val stringRepresentation: String | |
| } | |
| class Box(override val weight: Int) : Item { | |
| override val stringRepresentation: String = "Box" | |
| } | |
| class Container(items: List<Item>) : Item { | |
| override val weight: Int = items.sumOf { it.weight } + 2 | |
| // or ==> override val weight: Int | |
| // get() = items.sumOf { it.weight } + 2 | |
| override val stringRepresentation: String = "Container" | |
| } | |
| class WeightCalculator { | |
| fun calculate(items: List<Item>) = items.sumOf { it.weight } | |
| } | |
| class PrettyPrinter(private val logger: Logger) { | |
| init { | |
| logger.config(Level.VERBOSE) | |
| } | |
| fun print(items: List<Item>) = items.forEach { logger.log(it.stringRepresentation) } | |
| } | |
| class XMLPrinter(private val xmlWriter: XMLWriter) { | |
| fun print(items: List<Item>) { | |
| xmlWriter.writeComment("writing all items") | |
| items.forEach { | |
| xmlWriter.addNode(it.stringRepresentation) // representing xml in parent-child format is inhibited for brevity | |
| } | |
| xmlWriter.writeComment("finish writing items") | |
| } | |
| } | |
| class XMLWriter { | |
| fun addNode(stringRepresentation: String) { | |
| TODO("Not yet implemented") | |
| } | |
| fun writeComment(s: String) { | |
| TODO("Not yet implemented") | |
| } | |
| } | |
| class Logger { | |
| fun config(level: Level) { | |
| TODO("Not yet implemented") | |
| } | |
| fun log(stringRepresentation: String) { | |
| TODO("Not yet implemented") | |
| } | |
| } | |
| enum class Level { | |
| VERBOSE | |
| } |
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