wvlet.airframe.codec.EnumCodec.scala Maven / Gradle / Ivy

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/*
 * 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.EnumSurface

/**
  * A codec for Enum-like case objects that can be instantiated with unapply(String)
  */
class EnumCodec[A](enumSurface: EnumSurface) extends MessageCodec[A] {
  override def pack(p: Packer, v: A): Unit = {
    p.packString(v.toString)
  }
  override def unpack(u: Unpacker, v: MessageContext): Unit = {
    val s = u.unpackString
    enumSurface.stringExtractor(enumSurface.rawType, s) match {
      case Some(x) => v.setObject(x)
      case None =>
        v.setIncompatibleFormatException(this, s"invalid string ${s} for enum: ${enumSurface}")
    }
  }
}