commonMain.com.ditchoom.mqtt.topic.Level.kt Maven / Gradle / Ivy

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package com.ditchoom.mqtt.topic

import com.ditchoom.mqtt.ProtocolError

sealed class TopicLevel(val value: CharSequence) {
    override fun toString() = value.toString()
}

sealed class LevelWildcard(valueL: String) : TopicLevel(valueL)

object MultiLevelWildcard : LevelWildcard("#")
object SingleLevelWildcard : LevelWildcard("+")
object EmptyValue : TopicLevel("")
object RootTopicValue : TopicLevel(Node.ROOT_TOPIC_NODE_VALUE)
data class StringTopicLevel(val topicValue: CharSequence) : TopicLevel(topicValue) {
    init {
        if (topicValue.contains('#')) throw ProtocolError("Invalid character # in topic level $topicValue")
        if (topicValue.contains('+')) throw ProtocolError("Invalid character + in topic level $topicValue")
    }
}

fun CharSequence.toTopicLevel(): TopicLevel {
    return when (this) {
        "#" -> MultiLevelWildcard
        "+" -> SingleLevelWildcard
        "" -> EmptyValue
        Node.ROOT_TOPIC_NODE_VALUE -> RootTopicValue
        else -> StringTopicLevel(this)
    }
}