spark MutablePair 源码
spark MutablePair 代码
文件路径：/core/src/main/scala/org/apache/spark/util/MutablePair.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.util
import org.apache.spark.annotation.DeveloperApi
/**
* :: DeveloperApi ::
* A tuple of 2 elements. This can be used as an alternative to Scala's Tuple2 when we want to
* minimize object allocation.
*
* @param _1 Element 1 of this MutablePair
* @param _2 Element 2 of this MutablePair
*/
@DeveloperApi
case class MutablePair[@specialized(Int, Long, Double, Char, Boolean/* , AnyRef */) T1,
@specialized(Int, Long, Double, Char, Boolean/* , AnyRef */) T2]
(var _1: T1, var _2: T2)
extends Product2[T1, T2]
{
/** No-arg constructor for serialization */
def this() = this(null.asInstanceOf[T1], null.asInstanceOf[T2])
/** Updates this pair with new values and returns itself */
def update(n1: T1, n2: T2): MutablePair[T1, T2] = {
_1 = n1
_2 = n2
this
}
override def toString: String = "(" + _1 + "," + _2 + ")"
override def canEqual(that: Any): Boolean = that.isInstanceOf[MutablePair[_, _]]
}
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