76 lines
2.1 KiB
Scala
76 lines
2.1 KiB
Scala
package gs.predicate.v0.kv
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import cats.Functor
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import cats.syntax.all.*
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import gs.predicate.v0.api.Messages
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import gs.predicate.v0.api.Predicate
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import gs.predicate.v0.serde.json.JsonKeys
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import io.circe.Decoder
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import io.circe.DecodingFailure
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import io.circe.Encoder
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import io.circe.Json
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/** Predicate that matches if some [[KeyValueProvider]] contains the given key,
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* and the value associated with that key is contained in the set of given
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* values.
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*
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* @param key
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* The key that should exist.
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* @param values
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* The list of values, such that one value should match the input.
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*/
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final class ValueIn[F[_]: Functor: KeyValueProvider](
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val key: String,
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val values: Set[String]
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) extends Predicate[F]:
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/** @inheritDocs
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*/
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override def predicateType: String = ValueIn.PredicateType
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/** @inheritDocs
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*/
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override def eval(): F[Predicate.Result] =
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KeyValueProvider[F].get(key).map {
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case Some(value) => Predicate.Result(values.contains(value))
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case _ => Predicate.Result.missed()
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}
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object ValueIn:
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final val PredicateType: String = "kv-value-in"
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def apply[F[_]: Functor: KeyValueProvider](
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key: String,
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values: Set[String]
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): ValueIn[F] =
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new ValueIn[F](key, values)
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given valueInEncoder[F[_]]: Encoder[ValueIn[F]] =
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Encoder.instance[ValueIn[F]] { p =>
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Json.obj(
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(JsonKeys.predicateType, Json.fromString(PredicateType)),
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(JsonKeys.key, Json.fromString(p.key)),
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(JsonKeys.values, Json.fromValues(p.values.map(Json.fromString)))
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)
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}
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given valueInDecoder[F[_]: Functor: KeyValueProvider]: Decoder[ValueIn[F]] =
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Decoder.instance[ValueIn[F]] { cursor =>
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cursor.downField(JsonKeys.predicateType).as[String].flatMap {
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case PredicateType =>
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for
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key <- cursor.downField(JsonKeys.key).as[String]
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values <- cursor.downField(JsonKeys.value).as[Set[String]]
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yield new ValueIn(key, values)
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case candidate =>
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Left(
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DecodingFailure(
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Messages.invalidPredicateType(candidate, PredicateType),
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Nil
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)
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)
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}
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}
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end ValueIn
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