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/*
* 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
/**
* The direction of a directed edge relative to a vertex.
*/
class EdgeDirection private (private val name: String) extends Serializable {
/**
* Reverse the direction of an edge. An in becomes out,
* out becomes in and both and either remain the same.
*/
def reverse: EdgeDirection = this match {
case EdgeDirection.In => EdgeDirection.Out
case EdgeDirection.Out => EdgeDirection.In
case EdgeDirection.Either => EdgeDirection.Either
case EdgeDirection.Both => EdgeDirection.Both
}
override def toString: String = "EdgeDirection." + name
override def equals(o: Any): Boolean = o match {
case other: EdgeDirection => other.name == name
case _ => false
}
override def hashCode: Int = name.hashCode
}
/**
* A set of [[EdgeDirection]]s.
*/
object EdgeDirection {
/** Edges arriving at a vertex. */
final val In: EdgeDirection = new EdgeDirection("In")
/** Edges originating from a vertex. */
final val Out: EdgeDirection = new EdgeDirection("Out")
/** Edges originating from *or* arriving at a vertex of interest. */
final val Either: EdgeDirection = new EdgeDirection("Either")
/** Edges originating from *and* arriving at a vertex of interest. */
final val Both: EdgeDirection = new EdgeDirection("Both")
}
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