import com.sun.hotspot.igv.coordinator.actions.DiffGraphCookie; //导入依赖的package包/类
private GraphNode(InputGraph graph, InstanceContent content) {
    super(Children.LEAF, new AbstractLookup(content));
    this.graph = graph;
    this.setDisplayName(graph.getName());
    content.add(graph);

    final GraphViewer viewer = Lookup.getDefault().lookup(GraphViewer.class);

    if (viewer != null) {
        // Action for opening the graph
        content.add(new GraphOpenCookie(viewer, graph));
    }

    // Action for removing a graph
    content.add(new GraphRemoveCookie(graph));

    // Action for diffing to the current graph
    content.add(new DiffGraphCookie(graph));

    // Action for cloning to the current graph
    content.add(new GraphCloneCookie(viewer, graph));
}
 

import com.sun.hotspot.igv.coordinator.actions.DiffGraphCookie; //导入依赖的package包/类
@Override
public <T extends Node.Cookie> T getCookie(Class<T> aClass) {
    if (aClass == DiffGraphCookie.class) {
        InputGraphProvider graphProvider = Utilities.actionsGlobalContext().lookup(InputGraphProvider.class);

        InputGraph graphA = null;
        if (graphProvider != null) {
            graphA = graphProvider.getGraph();
        }

        if (graphA != null && !graphA.isDifferenceGraph()) {
            return (T) new DiffGraphCookie(graphA, graph);
        }
    }

    return super.getCookie(aClass);
}
 

import com.sun.hotspot.igv.coordinator.actions.DiffGraphCookie; //导入依赖的package包/类
private GraphNode(InputGraph graph, InstanceContent content) {
    super(Children.LEAF, new AbstractLookup(content));
    this.graph = graph;
    this.setDisplayName(graph.getName());
    content.add(graph);

    final GraphViewer viewer = Lookup.getDefault().lookup(GraphViewer.class);

    if (viewer != null) {
        // Action for opening the graph
        content.add(new GraphOpenCookie(viewer, graph));
    }

    // Action for removing a graph
    content.add(new GraphRemoveCookie(graph));

    // Action for diffing to the current graph
    content.add(new DiffGraphCookie(graph));

    // Action for cloning to the current graph
    content.add(new GraphCloneCookie(viewer, graph));

    this.addNodeListener(new NodeAdapter() {
        @Override
        public void childrenRemoved(NodeMemberEvent ev) {
            GraphNode.this.graph = null;
        }
    });
}