Path.of()

piflow-core/src/main/scala/main.scala

@@ -1,5 +1,7 @@
 package cn.piflow
 
+import java.security.InvalidParameterException
+
 import cn.piflow.util.{IdGenerator, Logging}
 import org.apache.spark.sql._
 
@@ -104,6 +106,33 @@ object Path {
       }
     };
   }
+
+  def of(path: (Any, String)): Path = {
+    val pi = new PathImpl();
+
+    def _addEdges(path: (Any, String)): Unit = {
+      val value1 = path._1;
+
+      //String->String
+      if (value1.isInstanceOf[String]) {
+        pi.addEdge(new Edge(value1.asInstanceOf[String], path._2, "", ""));
+      }
+
+      //(String->String)->String
+      else if (value1.isInstanceOf[(Any, String)]) {
+        val tuple = value1.asInstanceOf[(Any, String)];
+        _addEdges(tuple);
+        pi.addEdge(new Edge(tuple._2, path._2, "", ""));
+      }
+
+      else {
+        throw new InvalidParameterException(s"invalid parameter: $value1, String or (String, String) expected!");
+      }
+    }
+
+    _addEdges(path);
+    pi;
+  }
 }
 
 class FlowImpl extends Flow {

piflow-core/src/test/scala/FlowTest.scala

@@ -20,7 +20,7 @@ class FlowTest {
     flow.addProcess("PrintCount", new PrintCount());
     flow.addProcess("PrintMessage", new PrintMessage());
 
-    flow.addPath(Path.from("CleanHouse").to("CopyTextFile").to("CountWords").to("PrintCount"));
+    flow.addPath(Path.of("CleanHouse" -> "CopyTextFile" -> "CountWords" -> "PrintCount"));
 
     val spark = SparkSession.builder.master("local[4]")
       .getOrCreate();