commonTest.kotlinx.serialization.TestId.kt Maven / Gradle / Ivy

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/*
 * Copyright 2017-2019 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
 */

package kotlinx.serialization

import kotlinx.serialization.descriptors.*

@SerialInfo
@Target(AnnotationTarget.PROPERTY)
annotation class Id(val id: Int)

public fun getSerialId(desc: SerialDescriptor, index: Int): Int?
        = desc.findAnnotation(index)?.id

public inline fun  SerialDescriptor.findAnnotation(elementIndex: Int): A? {
    val candidates = getElementAnnotations(elementIndex).filterIsInstance()
    return when (candidates.size) {
        0 -> null
        1 -> candidates[0]
        else -> throw IllegalStateException("There are duplicate annotations of type ${A::class} in the descriptor $this")
    }
}