wvlet.airframe.codec.LazyCodec.scala Maven / Gradle / Ivy
/*
* 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 wvlet.airframe.codec
import wvlet.airframe.msgpack.spi.{Packer, Unpacker}
import wvlet.airframe.surface.Surface
/**
* For generating codec for recursive types.
*
* For example, if type X has a recursion like X(name:String, child:Option[X]), LazyCodec will be used to generate a
* codec instance as MessageCodec[X](StringCodec, OptionCodec(LazyCodec[X])).
*/
case class LazyCodec[A](surface: Surface, codecFactory: MessageCodecFactory) extends MessageCodec[A] {
private lazy val ref: MessageCodec[A] = codecFactory.ofSurface(surface).asInstanceOf[MessageCodec[A]]
override def pack(p: Packer, v: A): Unit = {
ref.pack(p, v)
}
override def unpack(u: Unpacker, v: MessageContext): Unit = {
ref.unpack(u, v)
}
}