NebulaUtil refactor (#95)

Author: artemkorsakov

nebula-algorithm/src/main/scala/com/vesoft/nebula/algorithm/utils/NebulaUtil.scala

@@ -21,15 +21,10 @@ object NebulaUtil {
     */
   def loadInitGraph(dataSet: Dataset[Row], hasWeight: Boolean): Graph[None.type, Double] = {
     implicit val encoder: Encoder[Edge[Double]] = org.apache.spark.sql.Encoders.kryo[Edge[Double]]
-    val edges: RDD[Edge[Double]] = dataSet
-      .map(row => {
-        if (hasWeight) {
-          Edge(row.get(0).toString.toLong, row.get(1).toString.toLong, row.get(2).toString.toDouble)
-        } else {
-          Edge(row.get(0).toString.toLong, row.get(1).toString.toLong, 1.0)
-        }
-      })(encoder)
-      .rdd
+    val edges: RDD[Edge[Double]] = dataSet.map { row =>
+      val attr = if (hasWeight) row.get(2).toString.toDouble else 1.0
+      Edge(row.get(0).toString.toLong, row.get(1).toString.toLong, attr)
+    }(encoder).rdd
 
     Graph.fromEdges(edges, None)
   }
@@ -42,11 +37,7 @@ object NebulaUtil {
     *
     * @return validate result path
     */
-  def getResultPath(path: String, algorithmName: String): String = {
-    var resultFilePath = path
-    if (!resultFilePath.endsWith("/")) {
-      resultFilePath = resultFilePath + "/"
-    }
-    resultFilePath + algorithmName
-  }
+  def getResultPath(path: String, algorithmName: String): String =
+    if (path.endsWith("/")) s"$path$algorithmName"
+    else s"$path/$algorithmName"
 }