Re: [jgrapht-users] GraphMLExporter

[Szabolcs B. <bes...@gm...>]

Hi,

It is because you need to give a VertexNameProvider and an EdgeNameProvider
to the constructor of the exporter.
It seems you also need to define one pair of VertexNameProvider and
EdgeNameProvider for each vertex/edge respectively.
Here is a snippet on how to achieve such behaviour from the exporter:

class GraphNode {
>     String name;
>     String label;
>     String type;
>
>     public GraphNode(String name, String label, String type) {
>         this.name = name;
>         this.label = label;
>         this.type = type;
>     }
>
>     @Override
>     public String toString() {
>         return "GraphNode{" + "name=" + name + ", label=" + label + ",
> type=" + type + '}';
>     }
> }
>
> public class Main {
>
>     public static void main(String[] args) throws IOException,
> SAXException, TransformerConfigurationException {
>         DefaultDirectedGraph<GraphNode, DefaultEdge> g =
>                 new DefaultDirectedGraph<>(DefaultEdge.class);
>         GraphNode node1 = new GraphNode("node1","label1","type1");
>         GraphNode node2 = new GraphNode("node2","label2","type1");
>
>         g.addVertex(node1);
>         g.addVertex(node2);
>         g.addEdge(node1, node2);
>
>         VertexNameProvider<GraphNode> vLabelNameProvider = new
> StringNameProvider<>();
>         VertexNameProvider<GraphNode> vIdNameProvider = new
> IntegerNameProvider<>();
>
>         EdgeNameProvider<DefaultEdge> eLabelNameProvider = new
> StringEdgeNameProvider<>();
>         EdgeNameProvider<DefaultEdge> eIdNameProvider = new
> IntegerEdgeNameProvider<>();
>
>         GraphMLExporter<GraphNode, DefaultEdge> exporter
>                 = new GraphMLExporter<>(vIdNameProvider,
> vLabelNameProvider, eIdNameProvider, eLabelNameProvider);
>
>         FileWriter w = new FileWriter("output.txt");
>         exporter.export(w, g);
>     }
>
> }
>

And the result:

<?xml version="1.0" encoding="UTF-8"?><graphml xmlns="
> http://graphml.graphdrawing.org/xmlns" xsi:schemaLocation="
> http://graphml.graphdrawing.org/xmlns
> http://graphml.graphdrawing.org/xmlns/1.0/graphml.xsd" xmlns:xsi="
> http://www.w3.org/2001/XMLSchema-instance">
> <key id="vertex_label" for="node" attr.name="Vertex Label"
> attr.type="string"/>
> <key id="edge_label" for="edge" attr.name="Edge Label"
> attr.type="string"/>
> <graph edgedefault="directed">
> <node id="1">
> <data key="vertex_label">GraphNode{name=node1, label=label1,
> type=type1}</data>
> </node>
> <node id="2">
> <data key="vertex_label">GraphNode{name=node2, label=label2,
> type=type1}</data>
> </node>
> <edge id="1" source="1" target="2">
> <data key="edge_label"/>
> </edge>
> </graph>
> </graphml>
>

Üdvözlettel,

Besenyei Szabolcs

2016-06-16 16:55 GMT+02:00 Mansour Ahmadi <man...@gm...>:

> Hi,
>
> I am trying to save a graph with custom nodes, but the export function
> doesn't save the attributes of the graph nodes (it just saves an id for
> each node).
>
> public class GraphNode {
>     String name;
>     String label;
>     String type;
> }
>
> GraphMLExporter<GraphNode, DefaultEdge> exporter =
>                     new GraphMLExporter<GraphNode, DefaultEdge>();
> w = new FileWriter(file);
> exporter.export(w, this.g);
>
> Would you please help me how can I save all of the attributes of nodes?
>
> Thanks
>
>
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