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package Chapter4.util;
import java.io.File;
import GraphElements.RetweetEdge;
import GraphElements.UserNode;
import edu.uci.ics.jung.graph.DirectedGraph;
import edu.uci.ics.jung.graph.DirectedSparseGraph;
import edu.uci.ics.jung.graph.util.EdgeType;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.json.JSONException;
import org.json.JSONObject;
/**
* Some basic functionality to convert files collected
* in Chapter 2 to JUNG graphs.
*/
public class TweetFileToGraph {
public static DirectedGraph<UserNode, RetweetEdge> getRetweetNetwork(File tweetFile){
JSONObject tmp;
TweetFileProcessor tfp = new TweetFileProcessor(tweetFile);
DirectedSparseGraph<UserNode, RetweetEdge> dsg = new DirectedSparseGraph<UserNode, RetweetEdge>();
while (tfp.hasNext()){
tmp = tfp.next();
if(tmp==null)
{
continue;
}
//get the author
String user=null;
try {
user = tmp.getJSONObject("user").getString("screen_name");
} catch (JSONException ex) {
Logger.getLogger(TweetFileToGraph.class.getName()).log(Level.SEVERE, null, ex);
}
if(user==null)
{
continue;
}
//get the retweeted user
try{
JSONObject retweet = tmp.getJSONObject("retweeted_status");
String retweeted_user = retweet.getJSONObject("user").getString("screen_name");
//make an edge or increment the weight if it exists.
UserNode toUser = new UserNode(retweeted_user);
UserNode fromUser = new UserNode(user);
dsg.addVertex(toUser);
dsg.addVertex(fromUser);
RetweetEdge edge = new RetweetEdge(toUser, fromUser);
if(dsg.containsEdge(edge)){
dsg.findEdge(fromUser, toUser).incrementRTCount();
}
else{
dsg.addEdge(edge, fromUser, toUser);
}
dsg.addEdge(edge, fromUser, toUser, EdgeType.DIRECTED);
}
catch(JSONException ex){
//the tweet is not a retweet. this is not a problem.
}
}
return dsg;
}
}
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