storage/storage/src/main/scala/com/webank/wedatasphere/linkis/storage/resultset/txt/TextResultSerializer.scala

/*
 * Copyright 2019 WeBank
 *
 * 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 com.webank.wedatasphere.linkis.storage.resultset.txt

import com.webank.wedatasphere.linkis.common.io.resultset.ResultSerializer
import com.webank.wedatasphere.linkis.common.io.{MetaData, Record}
import com.webank.wedatasphere.linkis.storage.domain.Dolphin
import com.webank.wedatasphere.linkis.storage.{LineMetaData, LineRecord}

/**
  * Created by johnnwang on 10/20/18.
  */
class TextResultSerializer extends ResultSerializer{

  override def metaDataToBytes(metaData: MetaData): Array[Byte] = {
    if(metaData == null){
      lineToBytes(null)
    } else {
      val textMetaData = metaData.asInstanceOf[LineMetaData]
      lineToBytes(textMetaData.getMetaData)
    }
  }

  override def recordToBytes(record: Record): Array[Byte] = {
    val textRecord = record.asInstanceOf[LineRecord]
    lineToBytes(textRecord.getLine)
  }

  def lineToBytes(value: String): Array[Byte] = {
    val bytes = if(value == null) Dolphin.NULL_BYTES else Dolphin.getBytes(value)
    Dolphin.getIntBytes(bytes.length) ++ bytes
  }
}