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Value.scala
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Value.scala
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/*
* Copyright 2022 Valdemar Grange
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package gql
import io.circe.Json
sealed trait Value {
def asJson: Json
def name: String
}
/*
* GraphQL values are a strict superset of JSON.
* Types that nest other types such as list and object must preserve the information that GraphQL values contain.
* Enums and Strings in GraphQL are for instance represented as strings, but a string which is provided as a GraphQL value
* shouldn't be allowed as an enum value.
*/
object Value {
final case class IntValue(v: BigInt) extends Value {
override lazy val asJson: Json = Json.fromBigInt(v)
override def name: String = "Int"
}
final case class FloatValue(v: BigDecimal) extends Value {
override lazy val asJson: Json = Json.fromBigDecimal(v)
override def name: String = "Float"
}
final case class StringValue(v: String) extends Value {
override lazy val asJson: Json = Json.fromString(v)
override def name: String = "String"
}
final case class BooleanValue(v: Boolean) extends Value {
override lazy val asJson: Json = Json.fromBoolean(v)
override def name: String = "Boolean"
}
case object NullValue extends Value {
override lazy val asJson: Json = Json.Null
override def name: String = "Null"
}
final case class EnumValue(v: String) extends Value {
override lazy val asJson: Json = Json.fromString(v)
override def name: String = "Enum"
}
final case class ArrayValue(v: Vector[Value]) extends Value {
override lazy val asJson: Json = Json.fromValues(v.map(_.asJson))
override def name: String = "List"
}
final case class ObjectValue(fields: Map[String, Value]) extends Value {
override lazy val asJson: Json = Json.fromFields(fields.map { case (k, v) => k -> v.asJson })
override def name: String = "Object"
}
def fromJson(j: Json): Value = j.fold(
jsonNull = NullValue,
jsonBoolean = BooleanValue(_),
jsonNumber = n => n.toBigInt.map(IntValue(_)).getOrElse(FloatValue(n.toBigDecimal.getOrElse(BigDecimal(n.toDouble)))),
jsonString = StringValue(_),
jsonArray = a => ArrayValue(a.map(fromJson)),
jsonObject = jo => ObjectValue(jo.toMap.view.mapValues(fromJson).toMap)
)
}