smithy4s.json.internals.JCodec.scala Maven / Gradle / Ivy
/*
* Copyright 2021-2024 Disney Streaming
*
* Licensed under the Tomorrow Open Source Technology License, Version 1.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://disneystreaming.github.io/TOST-1.0.txt
*
* 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 smithy4s
package json
package internals
import com.github.plokhotnyuk.jsoniter_scala.core._
/**
* Construct that expresses the ability to decode an http message,
* the metadata of which will have already been decoded and staged
* in a Map[String, Any] indexed by field.
*
* On the encoding side, the fields that should be stored in metadata
* are eluded.
*/
private[internals] trait JCodec[A] extends JsonCodec[A] {
self =>
def canBeKey: Boolean = true
def expecting: String
/**
* States whether this codec expects data
* from the body of an http request (as opposed to
* from headers, query params, etc). Used to prevent
* parsing altogether when not required.
*/
def expectBody: Boolean = true
def decodeValue(cursor: Cursor, in: JsonReader): A
override final def decodeValue(in: JsonReader, default: A): A =
Cursor.withCursor(expecting) { cursor =>
decodeValue(cursor, in)
}
override final def nullValue: A = null.asInstanceOf[A]
def biject[B](to: A => B, from: B => A): JCodec[B] =
new JCodec[B] {
override def expecting: String = self.expecting
override def canBeKey: Boolean = self.canBeKey
def decodeValue(cursor: Cursor, in: JsonReader): B =
to(self.decodeValue(cursor, in))
def decodeKey(in: JsonReader): B =
to(self.decodeKey(in))
def encodeValue(value: B, out: JsonWriter): Unit =
self.encodeValue(from(value), out)
def encodeKey(value: B, out: JsonWriter): Unit =
self.encodeKey(from(value), out)
}
}