Toolkit - Filter
From Gephi:Wiki
This Toolkit Example is part of the toolkit-demos project, that can be download from the website.
Demo
This demo shows how to create and execute filter queries.
The demo creates three filters queries and execute them:
- Filter degrees, remove nodes with degree < 10
- Filter with partition, keep nodes with 'source' column equal to 'Blogorama'
- Intersection between degrees and partition, AND filter with two precedent filters
- Ego filter
When a filter query is executed, it creates a new graph view, which is a copy of the graph structure that went through the filter pipeline. Several filters can be chained by setting sub-queries. A query is a tree where the root is the last executed filter.
See also Filters API documentation and find all filters that inherit from Filter.
//Init a project - and therefore a workspace ProjectController pc = Lookup.getDefault().lookup(ProjectController.class); pc.newProject(); Workspace workspace = pc.getCurrentWorkspace(); //Get controllers and models ImportController importController = Lookup.getDefault().lookup(ImportController.class); GraphModel graphModel = Lookup.getDefault().lookup(GraphController.class).getModel(); AttributeModel attributeModel = Lookup.getDefault().lookup(AttributeController.class).getModel(); //Import file Container container; try { File file = new File(getClass().getResource("/org/gephi/toolkit/demos/resources/polblogs.gml").toURI()); container = importController.importFile(file); } catch (Exception ex) { ex.printStackTrace(); return; } //Append imported data to GraphAPI importController.process(container, new DefaultProcessor(), workspace); //Filter, remove degree < 10 FilterController filterController = Lookup.getDefault().lookup(FilterController.class); DegreeRangeFilter degreeFilter = new DegreeRangeFilter(); degreeFilter.init(graphModel.getGraph()); degreeFilter.setRange(new Range(10, Integer.MAX_VALUE)); //Remove nodes with degree < 10 Query query = filterController.createQuery(degreeFilter); GraphView view = filterController.filter(query); graphModel.setVisibleView(view); //Set the filter result as the visible view //Count nodes and edges on filtered graph DirectedGraph graph = graphModel.getDirectedGraphVisible(); System.out.println("Nodes: " + graph.getNodeCount() + " Edges: " + graph.getEdgeCount()); //Filter, keep partition 'Blogarama'. Build partition with 'source' column in the data PartitionController partitionController = Lookup.getDefault().lookup(PartitionController.class); Partition p = partitionController.buildPartition(attributeModel.getNodeTable().getColumn("source"), graph); NodePartitionFilter partitionFilter = new NodePartitionFilter(p); partitionFilter.unselectAll(); partitionFilter.addPart(p.getPartFromValue("Blogarama")); Query query2 = filterController.createQuery(partitionFilter); GraphView view2 = filterController.filter(query2); graphModel.setVisibleView(view2); //Set the filter result as the visible view //Count nodes and edges on filtered graph graph = graphModel.getDirectedGraphVisible(); System.out.println("Nodes: " + graph.getNodeCount() + " Edges: " + graph.getEdgeCount()); //Combine two filters with AND - Set query and query2 as sub-query of AND IntersectionOperator intersectionOperator = new IntersectionOperator(); Query query3 = filterController.createQuery(intersectionOperator); filterController.setSubQuery(query3, query); filterController.setSubQuery(query3, query2); GraphView view3 = filterController.filter(query3); graphModel.setVisibleView(view3); //Set the filter result as the visible view //Count nodes and edges on filtered graph graph = graphModel.getDirectedGraphVisible(); System.out.println("Nodes: " + graph.getNodeCount() + " Edges: " + graph.getEdgeCount()); //Ego filter EgoFilter egoFilter = new EgoFilter(); egoFilter.setPattern("obamablog.com"); //Regex accepted egoFilter.setDepth(1); Query queryEgo = filterController.createQuery(egoFilter); GraphView viewEgo = filterController.filter(queryEgo); graphModel.setVisibleView(viewEgo); //Set the filter result as the visible view //Count nodes and edges on filtered graph graph = graphModel.getDirectedGraphVisible(); System.out.println("Nodes: " + graph.getNodeCount() + " Edges: " + graph.getEdgeCount());
