spark EdgeTriplet 源码
spark EdgeTriplet 代码
文件路径：/graphx/src/main/scala/org/apache/spark/graphx/EdgeTriplet.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.graphx
/**
* An edge triplet represents an edge along with the vertex attributes of its neighboring vertices.
*
* @tparam VD the type of the vertex attribute.
* @tparam ED the type of the edge attribute
*/
class EdgeTriplet[VD, ED] extends Edge[ED] {
/**
* The source vertex attribute
*/
var srcAttr: VD = _ // nullValue[VD]
/**
* The destination vertex attribute
*/
var dstAttr: VD = _ // nullValue[VD]
/**
* Set the edge properties of this triplet.
*/
protected[spark] def set(other: Edge[ED]): EdgeTriplet[VD, ED] = {
srcId = other.srcId
dstId = other.dstId
attr = other.attr
this
}
/**
* Given one vertex in the edge return the other vertex.
*
* @param vid the id one of the two vertices on the edge
* @return the attribute for the other vertex on the edge
*/
def otherVertexAttr(vid: VertexId): VD =
if (srcId == vid) dstAttr else { assert(dstId == vid); srcAttr }
/**
* Get the vertex object for the given vertex in the edge.
*
* @param vid the id of one of the two vertices on the edge
* @return the attr for the vertex with that id
*/
def vertexAttr(vid: VertexId): VD =
if (srcId == vid) srcAttr else { assert(dstId == vid); dstAttr }
override def toString: String = ((srcId, srcAttr), (dstId, dstAttr), attr).toString()
def toTuple: ((VertexId, VD), (VertexId, VD), ED) = ((srcId, srcAttr), (dstId, dstAttr), attr)
}
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