from webgraph datasets create simple graph files (csv)

gistfile1.java

import it.unimi.dsi.webgraph.*;

import java.io.File;
import java.io.FileWriter;

/**
 * Created by yluo on 6/13/2014.
 * webgraph: http://webgraph.di.unimi.it/
 * 
 * output format: node [children]
 * 
 */
public class Main {
    public static void main(String[] args) {
        String input = "D:\\webbase-2001";
        String output = "D:\\webbase_ge200.txt";
        File towrite = new File(output);
        int degreeThreshold = 200;
        try {
            FileWriter fw = new FileWriter(towrite);
            ImmutableGraph graph = ImmutableGraph.loadSequential(input);
            NodeIterator ni = graph.nodeIterator();
            while(ni.hasNext()) {
                //get the node
                int node = ni.nextInt();
                int outdegree = ni.outdegree();
                if(outdegree >= degreeThreshold) {
                    //output the node and the neighbors, per line
                    fw.write(Integer.toString(node) + " ");
                    LazyIntIterator li = ni.successors();
                    while( outdegree-- != 0 ) {
                        fw.write(Integer.toString(li.nextInt()) + " ");
                    }
                    fw.write("\n");
                }
            }
            fw.close();
        }catch(Exception e) {
            System.err.println(e);
        }
        System.out.println("hello world!");
    }
}