org.apache.spark.sql.execution.streaming.LongOffset.scala Maven / Gradle / Ivy
/*
* 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,
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* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.spark.sql.execution.streaming
/**
* A simple offset for sources that produce a single linear stream of data.
*/
case class LongOffset(offset: Long) extends Offset {
override val json = offset.toString
def +(increment: Long): LongOffset = new LongOffset(offset + increment)
def -(decrement: Long): LongOffset = new LongOffset(offset - decrement)
}
object LongOffset {
/**
* LongOffset factory from serialized offset.
* @return new LongOffset
*/
def apply(offset: SerializedOffset) : LongOffset = new LongOffset(offset.json.toLong)
/**
* Convert generic Offset to LongOffset if possible.
* @return converted LongOffset
*/
def convert(offset: Offset): Option[LongOffset] = offset match {
case lo: LongOffset => Some(lo)
case so: SerializedOffset => Some(LongOffset(so))
case _ => None
}
}