Question

JGraphT的ClassBasedVertexFactory.createVertex()为我的case类的构造函数抛出NoSuchMethodException。（运行时报告未找到TJunction.<init>()。）

这是我的父类：

package org.uom.fyp.engine

   class Node {

     private var nType: RoadStructure.EnumVal = RoadStructure.Default

     /**
      * Returns the node's type. (e.g.: <b>RoadStructure.Default</b>)
      */
     def nodeType: RoadStructure.EnumVal = nType

     /**
      * Sets the node's type.
      * @param nType The node's type.
      */
     def nodeType_(nType: RoadStructure.EnumVal) = {
       this.nType = nType
     }

   }

其次是我的一个案例类：

   package org.uom.fyp.engine

   case class TJunction(p: Edge, c1: Edge, c2: Edge) extends Node {
     val priority = p
     val converging1 = c1
     val converging2 = c2
   }

这是我创建顶点的地方：

 def createLaneSlice(network: RoadNetwork, start: Node = null, edgeType: RoadStructure.EnumVal): Edge = {
  var vertexFactory: ClassBasedVertexFactory[Node] = null
  if (edgeType == RoadStructure.TJunction) {
    vertexFactory = new ClassBasedVertexFactory(classOf[TJunction])
  } else if (edgeType == RoadStructure.Roadabout) {
    vertexFactory = new ClassBasedVertexFactory(classOf[Roundabout])
  } else if (edgeType == RoadStructure.Crossroads) {
    vertexFactory = new ClassBasedVertexFactory(classOf[Crossroads])
  } else {
    vertexFactory = new ClassBasedVertexFactory(classOf[Node])
  }

  var v1: Node = null
  if (start == null) {
    v1 = vertexFactory.createVertex()
  } else {
    v1 = start
  }
  val v2: Node = vertexFactory.createVertex()
  network.addVertex(v1)
  network.addVertex(v2)

Answer 1

从我的case类中删除自定义构造函数并将其替换为后续属性的setter就可以了。

感谢@ Marco13的启发性评论。

通过ClassBasedVertexFactory初始化case类时，JGraphT抛出NoSuchMethodException

1 个答案: