spark DataTypeJsonUtils 源码
spark DataTypeJsonUtils 代码
文件路径：/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/DataTypeJsonUtils.scala
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.spark.sql.catalyst.util
import com.fasterxml.jackson.core.{JsonGenerator, JsonParser}
import com.fasterxml.jackson.databind.{DeserializationContext, JsonDeserializer, JsonSerializer, SerializerProvider}
import org.json4s.JsonAST.JValue
import org.json4s.jackson.{JValueDeserializer, JValueSerializer}
import org.apache.spark.sql.types.DataType
object DataTypeJsonUtils {
/**
* Jackson serializer for [[DataType]]. Internally this delegates to json4s based serialization.
*/
class DataTypeJsonSerializer extends JsonSerializer[DataType] {
private val delegate = new JValueSerializer
override def serialize(
value: DataType,
gen: JsonGenerator,
provider: SerializerProvider): Unit = {
delegate.serialize(value.jsonValue, gen, provider)
}
}
/**
* Jackson deserializer for [[DataType]]. Internally this delegates to json4s based
* deserialization.
*/
class DataTypeJsonDeserializer extends JsonDeserializer[DataType] {
private val delegate = new JValueDeserializer(classOf[Any])
override def deserialize(
jsonParser: JsonParser,
deserializationContext: DeserializationContext): DataType = {
val json = delegate.deserialize(jsonParser, deserializationContext)
DataType.parseDataType(json.asInstanceOf[JValue])
}
}
}
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