BlobStorageUri (kotlin, jackson)

BlobStorageUri.kt

import com.fasterxml.jackson.annotation.JsonCreator
import com.fasterxml.jackson.annotation.JsonValue

data class BlobStorageUri(
        val account: String,
        val container: String,
        val key: String
) {

    val uri: String
        @JsonValue
        get() = toUriString()

    companion object {
        const val scheme = "blobstorage://"

        @JsonCreator
        @JvmStatic
        fun ofUriString(uriString: String): BlobStorageUri {
            val (account, container, key) = parse(uriString)
            return BlobStorageUri(account = account, container = container, key = key)
        }
    }
}

fun BlobStorageUri.toUriString(): String {
    if (key.isNotEmpty()) {
        return "${BlobStorageUri.scheme}$account/$container/$key"
    }
    if (container.isNotEmpty()) {
        return "${BlobStorageUri.scheme}$account/$container"
    }
    if (account.isNotEmpty()) {
        return "${BlobStorageUri.scheme}$account"
    }
    return BlobStorageUri.scheme
}

private fun parse(uriString: String): Triple<String, String, String> {
    if (!uriString.startsWith(BlobStorageUri.scheme)) {
        error("Malformed UriString! BlobStorageUri must start with ${BlobStorageUri.scheme} . given: $uriString")
    }
    val withoutPrefix = uriString.removePrefix(BlobStorageUri.scheme)
    val parts = withoutPrefix.split("/")
    val account = parts.getOrNull(0)
            ?: return Triple("", "", "")
    val container = parts.getOrNull(1)
            ?: return Triple(account, "", "")
    val rest = parts.filterIndexed { index, value ->
        index > 1
    }
    val key = rest.joinToString(separator = "/")
    return Triple(account, container, key)
}