cz/vutbr/fit/dudka/SGVis/Lookup/Response.java

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package cz.vutbr.fit.dudka.SGVis.Lookup;

import java.net.MalformedURLException;
import java.net.URL;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import cz.vutbr.fit.dudka.SGVis.Data.Relation;
import cz.vutbr.fit.dudka.SGVis.Data.RelationStorage;

public class Response {
  private JSONObject jsObj;
  
  public Response(String responseText) throws JSONException {
    jsObj = new JSONObject(responseText);
  }
  
  public void addTo(RelationStorage storage) throws JSONException, MalformedURLException {
    ResponseParser parser = new ResponseParser(storage);
    parser.parse(jsObj);
  }
  
  private class ResponseParser {
    private RelationStorage storage;
    public ResponseParser(RelationStorage storage) {
      this.storage = storage;
    }
    @SuppressWarnings("unchecked")
    public void parse(JSONObject response) throws JSONException, MalformedURLException {
      JSONObject nodes = response.getJSONObject("nodes");
      java.util.Iterator iter = nodes.keys();
      while (iter.hasNext()) {
        String hostName = (String) iter.next();
        this.handleHost(
            hostName,
            nodes.getJSONObject(hostName));
      }
    }
    private void handleHost(
        String hostName,
        JSONObject hostData
        ) throws JSONException, MalformedURLException
    {
      this.handleHostData(hostName, hostData, false);
      this.handleHostData(hostName, hostData, true);
    }
    private void handleHostData(
        String hostName,
        JSONObject hostData,
        boolean backLink
        ) throws JSONException, MalformedURLException
    {
      String nodeName = backLink?
          "nodes_referenced_by":
          "nodes_referenced";
      if (hostData.has(nodeName)) {
        JSONObject refs = hostData.getJSONObject(nodeName);
        java.util.Iterator iter = refs.keys();
        while (iter.hasNext()) {
          String refName = (String) iter.next();
          this.handleReference(
              hostName,
              refName,
              refs.getJSONObject(refName),
              backLink);
        }
      }
    }
    private void handleReference(
        String hostName,
        String refName,
        JSONObject refData,
        boolean backLink
        ) throws JSONException, MalformedURLException
    {
      JSONArray types = refData.getJSONArray("types");
      for(int i=0; i<types.length(); i++)
        this.handleRelation(
            backLink?refName:hostName,
            backLink?hostName:refName,
            types.getString(i)
            );
    }
    private void handleRelation(
        String from,
        String to,
        String edgeType
        ) throws MalformedURLException
    {
      URL fromUrl = new URL(from);
      URL toUrl = new URL(to);
      Relation relation = new Relation(fromUrl, toUrl, edgeType);
      storage.add(relation);
    }
  }
}

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