scala.io.circe.jackson.CirceJsonModule.scala Maven / Gradle / Ivy

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/*
 * Copyright 2016 circe
 *
 * 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 io.circe.jackson

import com.fasterxml.jackson.core.Version
import com.fasterxml.jackson.databind.BeanDescription
import com.fasterxml.jackson.databind.DeserializationConfig
import com.fasterxml.jackson.databind.JavaType
import com.fasterxml.jackson.databind.JsonSerializer
import com.fasterxml.jackson.databind.Module.SetupContext
import com.fasterxml.jackson.databind.SerializationConfig
import com.fasterxml.jackson.databind.deser.Deserializers
import com.fasterxml.jackson.databind.module.SimpleModule
import com.fasterxml.jackson.databind.ser.Serializers
import io.circe.Json

object CirceJsonModule extends SimpleModule("CirceJson", Version.unknownVersion()) {
  override final def setupModule(context: SetupContext): Unit = {
    context.addDeserializers(
      new Deserializers.Base {
        override final def findBeanDeserializer(
          javaType: JavaType,
          config: DeserializationConfig,
          beanDesc: BeanDescription
        ) = {
          val klass = javaType.getRawClass
          if (classOf[Json].isAssignableFrom(klass) || klass == Json.JNull.getClass) {
            new CirceJsonDeserializer(config.getTypeFactory, klass)
          } else null
        }
      }
    )

    context.addSerializers(
      new Serializers.Base {
        override final def findSerializer(
          config: SerializationConfig,
          javaType: JavaType,
          beanDesc: BeanDescription
        ) = {
          val ser: Object = if (classOf[Json].isAssignableFrom(beanDesc.getBeanClass)) {
            CirceJsonSerializer
          } else null

          ser.asInstanceOf[JsonSerializer[Object]]
        }
      }
    )
  }
}