spark DaysWritable 源码
spark DaysWritable 代码
文件路径：/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/DaysWritable.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.execution.datasources
import java.io.{DataInput, DataOutput, IOException}
import java.sql.Date
import org.apache.hadoop.hive.serde2.io.DateWritable
import org.apache.hadoop.io.WritableUtils
import org.apache.spark.sql.catalyst.util.RebaseDateTime.{rebaseGregorianToJulianDays, rebaseJulianToGregorianDays}
/**
* The class accepts/returns days in Gregorian calendar and rebase them
* via conversion to local date in Julian calendar for dates before 1582-10-15
* in read/write for backward compatibility with Spark 2.4 and earlier versions.
*
* @param gregorianDays The number of days since the epoch 1970-01-01 in
* Gregorian calendar.
* @param julianDays The number of days since the epoch 1970-01-01 in
* Julian calendar.
*/
class DaysWritable(
var gregorianDays: Int,
var julianDays: Int)
extends DateWritable {
def this() = this(0, 0)
def this(gregorianDays: Int) =
this(gregorianDays, rebaseGregorianToJulianDays(gregorianDays))
def this(dateWritable: DateWritable) = {
this(
gregorianDays = dateWritable match {
case daysWritable: DaysWritable => daysWritable.gregorianDays
case dateWritable: DateWritable =>
rebaseJulianToGregorianDays(dateWritable.getDays)
},
julianDays = dateWritable.getDays)
}
override def getDays: Int = julianDays
override def get: Date = {
new Date(DateWritable.daysToMillis(julianDays))
}
override def get(doesTimeMatter: Boolean): Date = {
new Date(DateWritable.daysToMillis(julianDays, doesTimeMatter))
}
override def set(d: Int): Unit = {
gregorianDays = d
julianDays = rebaseGregorianToJulianDays(d)
}
@throws[IOException]
override def write(out: DataOutput): Unit = {
WritableUtils.writeVInt(out, julianDays)
}
@throws[IOException]
override def readFields(in: DataInput): Unit = {
julianDays = WritableUtils.readVInt(in)
gregorianDays = rebaseJulianToGregorianDays(julianDays)
}
}
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