Meta converters return non-nullables
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@ -6,6 +6,7 @@
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- Added separate `Meta`, `SealedMeta` and `ObservableMutableMeta` builders.
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### Changed
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- Meta converter `metaToObject` returns a non-nullable type. Additional method `metaToObjectOrNull` for nullable return.
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- Kotlin 1.9.20.
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- Migrated from ktor-io to kotlinx-io.
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- `MutableMeta` builder now returns a simplified version of meta that does not hold listeners.
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@ -8,7 +8,7 @@ plugins {
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allprojects {
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group = "space.kscience"
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version = "0.6.3-dev-1"
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version = "0.7.0-dev-1"
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}
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subprojects {
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@ -6,74 +6,77 @@ import space.kscience.dataforge.meta.*
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* A converter of generic object to and from [Meta]
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*/
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public interface MetaConverter<T> {
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public fun metaToObject(meta: Meta): T?
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/**
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* Attempt conversion of [meta] to an object or return null if conversion failed
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*/
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public fun metaToObjectOrNull(meta: Meta): T?
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public fun metaToObject(meta: Meta): T =
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metaToObjectOrNull(meta) ?: error("Meta $meta could not be interpreted by $this")
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public fun objectToMeta(obj: T): Meta
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public companion object {
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public val meta: MetaConverter<Meta> = object : MetaConverter<Meta> {
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override fun metaToObject(meta: Meta): Meta = meta
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override fun metaToObjectOrNull(meta: Meta): Meta = meta
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override fun objectToMeta(obj: Meta): Meta = obj
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}
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public val value: MetaConverter<Value> = object : MetaConverter<Value> {
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override fun metaToObject(meta: Meta): Value? = meta.value
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override fun metaToObjectOrNull(meta: Meta): Value? = meta.value
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override fun objectToMeta(obj: Value): Meta = Meta(obj)
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}
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public val string: MetaConverter<String> = object : MetaConverter<String> {
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override fun metaToObject(meta: Meta): String? = meta.string
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override fun metaToObjectOrNull(meta: Meta): String? = meta.string
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override fun objectToMeta(obj: String): Meta = Meta(obj.asValue())
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}
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public val boolean: MetaConverter<Boolean> = object : MetaConverter<Boolean> {
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override fun metaToObject(meta: Meta): Boolean? = meta.boolean
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override fun metaToObjectOrNull(meta: Meta): Boolean? = meta.boolean
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override fun objectToMeta(obj: Boolean): Meta = Meta(obj.asValue())
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}
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public val number: MetaConverter<Number> = object : MetaConverter<Number> {
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override fun metaToObject(meta: Meta): Number? = meta.number
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override fun metaToObjectOrNull(meta: Meta): Number? = meta.number
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override fun objectToMeta(obj: Number): Meta = Meta(obj.asValue())
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}
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public val double: MetaConverter<Double> = object : MetaConverter<Double> {
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override fun metaToObject(meta: Meta): Double? = meta.double
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override fun metaToObjectOrNull(meta: Meta): Double? = meta.double
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override fun objectToMeta(obj: Double): Meta = Meta(obj.asValue())
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}
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public val float: MetaConverter<Float> = object : MetaConverter<Float> {
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override fun metaToObject(meta: Meta): Float? = meta.float
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override fun metaToObjectOrNull(meta: Meta): Float? = meta.float
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override fun objectToMeta(obj: Float): Meta = Meta(obj.asValue())
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}
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public val int: MetaConverter<Int> = object : MetaConverter<Int> {
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override fun metaToObject(meta: Meta): Int? = meta.int
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override fun metaToObjectOrNull(meta: Meta): Int? = meta.int
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override fun objectToMeta(obj: Int): Meta = Meta(obj.asValue())
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}
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public val long: MetaConverter<Long> = object : MetaConverter<Long> {
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override fun metaToObject(meta: Meta): Long? = meta.long
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override fun metaToObjectOrNull(meta: Meta): Long? = meta.long
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override fun objectToMeta(obj: Long): Meta = Meta(obj.asValue())
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}
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public inline fun <reified E : Enum<E>> enum(): MetaConverter<E> = object : MetaConverter<E> {
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@Suppress("USELESS_CAST")
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override fun metaToObject(meta: Meta): E = meta.enum<E>() as? E ?: error("The Item is not a Enum")
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override fun metaToObjectOrNull(meta: Meta): E = meta.enum<E>() as? E ?: error("The Item is not a Enum")
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override fun objectToMeta(obj: E): Meta = Meta(obj.asValue())
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}
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public fun <T> valueList(
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writer: (T) -> Value = { Value.of(it) },
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reader: (Value) -> T
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reader: (Value) -> T,
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): MetaConverter<List<T>> =
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object : MetaConverter<List<T>> {
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override fun metaToObject(meta: Meta): List<T> =
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meta.value?.list?.map(reader) ?: error("The item is not a value list")
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override fun metaToObjectOrNull(meta: Meta): List<T>? = meta.value?.list?.map(reader)
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override fun objectToMeta(obj: List<T>): Meta = Meta(obj.map(writer).asValue())
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}
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@ -6,5 +6,5 @@ kotlin.mpp.stability.nowarn=true
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kotlin.incremental.js.ir=true
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kotlin.native.ignoreDisabledTargets=true
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toolsVersion=0.15.0-kotlin-1.9.20-RC
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toolsVersion=0.15.0-kotlin-1.9.20-RC2
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#kotlin.experimental.tryK2=true
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