JsonToActivityFrame.java

package activity.extraction;

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;

import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;

import activity.Activity;
import activity.ActivityFrame;

public class JsonToActivityFrame {

	static JSONParser parser = new JSONParser();

	// Read json file and return all activity frame object
	// TO DO
	// ======================================================================
	/**
	 * Return list of activity frame extract from file with json format
	 * 
	 * @param directory
	 *            that saves activity frame in json format
	 * @return a list of activity frame
	 * @throws IOException
	 * @throws ClassNotFoundException
	 * @throws ParseException
	 */
	public ArrayList<ActivityFrame> extractActivityFrameFromJSONFile(String directory)
			throws IOException, ClassNotFoundException, ParseException {
		ArrayList<ActivityFrame> allframe = new ArrayList<>();

		try (BufferedReader br = new BufferedReader(new FileReader(directory))) {

			String sCurrentLine;

			while ((sCurrentLine = br.readLine()) != null) {
				ActivityFrame newframe = jsonToActivityFrame(sCurrentLine);
				allframe.add(newframe);
			}
		}
		return allframe;
	}
	
	//Read a string in json format and return an activity frame
	public static ActivityFrame jsonToActivityFrame(String jsonStr) throws ParseException {
		return jsonToActivityFrame((JSONObject) parser.parse(jsonStr));
	}

	// Read an Json object to transfer to activity frame
	@SuppressWarnings("unchecked")
	public static ActivityFrame jsonToActivityFrame(JSONObject obj) {
		// Extract id
		int idframe = (int) (long) obj.get("id");

		// Extract list of location
		ArrayList<String> location = new ArrayList<>();
		JSONArray locationJ = (JSONArray) obj.get("location");
		Iterator<String> iteratorC = locationJ.iterator();
		while (iteratorC.hasNext()) {
			location.add(iteratorC.next());
		}

		// Extract list of temporal
		ArrayList<String> temporal = new ArrayList<>();
		JSONArray temporalJ = (JSONArray) obj.get("temporal");
		Iterator<String> iteratorT = temporalJ.iterator();
		while (iteratorT.hasNext()) {
			temporal.add(iteratorT.next());
		}

		// Extract list of part A
		ArrayList<String> partA = new ArrayList<>();
		JSONArray partAJ = (JSONArray) obj.get("part-agent");
		Iterator<String> iteratorA = partAJ.iterator();
		while (iteratorA.hasNext()) {
			partA.add(iteratorA.next());
		}

		// Extract list of part O
		ArrayList<String> partO = new ArrayList<>();
		JSONArray partOJ = (JSONArray) obj.get("part-object");
		Iterator<String> iteratorO = partOJ.iterator();
		while (iteratorO.hasNext()) {
			partO.add(iteratorO.next());
		}
		// Activity extraction

		JSONObject actJ = (JSONObject) obj.get("activity");
		// id
		int id = (int) (long) actJ.get("id");
		// verb
		String verb = (String) actJ.get("verb");
		// object
		String object = (String) actJ.get("object");
		// ori verb
		String oriverb = (String) actJ.get("ori-verb");
		// ori-object
		String oriobject = (String) actJ.get("ori-object");
		// image
		String image = (String) actJ.get("image");
		// cate id
		String cateid = (String) actJ.get("categoryid");
		// link id
		String linkid = (String) actJ.get("linkid");
		// view
		int view = (int) (long) actJ.get("view");
		// rate
		double rate = (double) (double) actJ.get("rating");
		// cluster id
		int clusterid = (int) (long) actJ.get("clusterid");
		// cluster name
		String clustername = (String) actJ.get("clustername");
		// video
		String video = (String) actJ.get("video");
		// parent
		String parent = (String) actJ.get("parent");
		// prev
		String prev = (String) actJ.get("prev");
		// next
		String next = (String) actJ.get("next");
		// list of sub-activity
		ArrayList<Integer> children = new ArrayList<>();
		JSONArray childrenJ = (JSONArray) actJ.get("sub-activity");
		Iterator<Long> iteratorS = childrenJ.iterator();
		while (iteratorS.hasNext()) {
			children.add((int) (long) iteratorS.next());
		}

		Activity newact = new Activity(id, verb, object, oriverb, oriobject, cateid, linkid, rate, view, image,
				clusterid, clustername, video, children, parent, prev, next);

		return (new ActivityFrame(idframe, newact, location, temporal, partA, partO));
	}
}