Java 如何探索JGraphX对象（即查找边和节点）？

我通过xml字符串获取图形，因此首先我将其转换为mxGraph对象：

mxGraph newGraph = new mxGraph();
org.w3c.dom.Node node = mxXmlUtils.parseXml(xml);
mxCodec decoder = new mxCodec(node.getOwnerDocument());
decoder.decode(node.getFirstChild(),newGraph.getModel());

现在我想做一些类似的事情：

for Edge edge newGraph.getAllEdges()
     System.out.println(edge.src+" "+edge.dst);

然而getallEdges返回对象，我找不到任何Edge类…这对我来说似乎很奇怪

newGraph.clearSelection(); 
newGraph.selectAll();
Object[] cells = newGraph.getSelectionCells(); //here you have all cells
for (Object c : cells) {
 mxCell cell = (mxCell) c; //cast
 if (cell.isVertex()) { //isVertex
   //todo
 }else{ //is not a vertex, so u can get source and target 
   //todo
   cell.getChildCount(); //Returns the number of child cells. (edges)
   cell.getChildAt(x); //Returns the child at the specified index. (target)
 }

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