Increase label visibility in GraphStream

import java.io.IOException;

import org.graphstream.algorithm.layout.openord.OpenOrdLayout;
import org.graphstream.graph.Edge;
import org.graphstream.graph.Graph;
import org.graphstream.graph.Node;
import org.graphstream.graph.implementations.MultiGraph;
import org.graphstream.stream.PipeBase;
import org.graphstream.stream.file.FileSource;
import org.graphstream.stream.file.FileSourceFactory;
import org.graphstream.ui.layout.springbox.implementations.SpringBox;
import org.graphstream.ui.swingViewer.Viewer;

public class LabelVisibility {
    public static class VisibleLink extends PipeBase {
        public void edgeAdded(String sourceId, long timeId, String edgeId,
                String source, String target, boolean directed) {
            sendNodeAdded(this.sourceId, edgeId);
            sendNodeAttributeAdded(this.sourceId, edgeId, "ui.class", "link");

            sendEdgeAdded(this.sourceId, edgeId + "_A", source, edgeId,
                    directed);
            sendEdgeAdded(this.sourceId, edgeId + "_B", edgeId, target,
                    directed);
        }

        public void edgeRemoved(String sourceId, long timeId, String edgeId) {
            sendNodeRemoved(this.sourceId, edgeId);
        }

        public void edgeAttributeAdded(String sourceId, long timeId,
                String edgeId, String attributeId, Object value) {
            sendNodeAttributeAdded(this.sourceId, edgeId, attributeId, value);

            if (attributeId.equals("ui.class")) {
                sendEdgeAttributeAdded(this.sourceId, edgeId + "_A",
                        attributeId, value);
                sendEdgeAttributeAdded(this.sourceId, edgeId + "_B",
                        attributeId, value);
            }
        }

        public void edgeAttributeChanged(String sourceId, long timeId,
                String edgeId, String attributeId, Object oldValue, Object value) {
            sendNodeAttributeChanged(this.sourceId, edgeId, attributeId,
                    oldValue, value);

            if (attributeId.equals("ui.class")) {
                sendEdgeAttributeChanged(this.sourceId, edgeId + "_A",
                        attributeId, oldValue, value);
                sendEdgeAttributeChanged(this.sourceId, edgeId + "_B",
                        attributeId, oldValue, value);
            }
        }

        public void edgeAttributeRemoved(String sourceId, long timeId,
                String edgeId, String attributeId) {
            sendNodeAttributeRemoved(this.sourceId, edgeId, attributeId);
        }
    }

    public static void main(String[] args) {
        System.setProperty("org.graphstream.ui.renderer",
                "org.graphstream.ui.j2dviewer.J2DGraphRenderer");

        Graph graph = new MultiGraph("__test__");
        Graph displayGraph = new MultiGraph("__test_display__");
        FileSource fs = null;

        VisibleLink vl = new VisibleLink();
        graph.addSink(vl);
        vl.addSink(displayGraph);

        try {
            fs = FileSourceFactory.sourceFor(___source___);
            fs.addSink(graph);
            fs.readAll(___source___);
        } catch (IOException e) {
            System.err.println(e.getMessage());
        } finally {
            fs.removeSink(graph);
        }

        for (Node node : graph)
            node.addAttribute("ui.label", node.getId());

        for (Edge edge : graph.getEachEdge()) {
            edge.addAttribute("ui.label", edge.getAttribute("arcvalue"));

            if (edge.getNumber("arcvalue") > 100)
                edge.addAttribute("ui.class", "biglink");
        }

        graph.addAttribute("ui.quality");
        graph.addAttribute("ui.antialias");
        graph.addAttribute("layout.gravity", 0.02);
        graph.addAttribute(
                "ui.stylesheet",
                "node {text-background-mode:plain;text-background-color:yellow;text-size:14px;text-padding:2px;} "
                        + "node.link {text-background-mode:plain;text-background-color:orange;text-size:11px;} "
                        + "node.biglink {text-background-color:red;text-size:11px;} "
                        + "edge {fill-color:gray;}"
                        + "edge.biglink {size:4px; fill-color:black;}");

        Viewer v = displayGraph.display(false);
        SpringBox l = new SpringBox();
        v.enableAutoLayout(l);
        l.shake();
    }
}