sql/catalyst/src/main/scala/org/apache/spark/sql/types/DateType.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.types

import scala.math.Ordering
import scala.reflect.runtime.universe.typeTag

import org.apache.spark.annotation.DeveloperApi
import org.apache.spark.sql.catalyst.ScalaReflectionLock


/**
 * :: DeveloperApi ::
 * A date type, supporting "0001-01-01" through "9999-12-31".
 *
 * Please use the singleton [[DataTypes.DateType]].
 *
 * Internally, this is represented as the number of days from 1970-01-01.
 */
@DeveloperApi
class DateType private() extends AtomicType {
  // The companion object and this class is separated so the companion object also subclasses
  // this type. Otherwise, the companion object would be of type "DateType$" in byte code.
  // Defined with a private constructor so the companion object is the only possible instantiation.
  private[sql] type InternalType = Int

  @transient private[sql] lazy val tag = ScalaReflectionLock.synchronized { typeTag[InternalType] }

  private[sql] val ordering = implicitly[Ordering[InternalType]]

  /**
   * The default size of a value of the DateType is 4 bytes.
   */
  override def defaultSize: Int = 4

  private[spark] override def asNullable: DateType = this
}


case object DateType extends DateType