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/* TweetTracker. Copyright (c) Arizona Board of Regents on behalf of Arizona State University
* @author shamanth
*/
package Chapter5.trends;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Date;
import java.util.HashMap;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
public class ControlChartExample
{
static final String DEF_INFILENAME = "ows.json";
static final SimpleDateFormat SDM = new SimpleDateFormat("dd MMM yyyy HH:mm");
public JSONArray GenerateDataTrend(String inFilename)
{
BufferedReader br = null;
JSONArray result = new JSONArray();
HashMap<String,Integer> datecount = new HashMap<String,Integer>();
try{
br= new BufferedReader(new InputStreamReader(new FileInputStream(inFilename),"UTF-8"));
String temp = "";
while((temp = br.readLine())!=null)
{
try {
JSONObject jobj = new JSONObject(temp);
long timestamp = jobj.getLong("timestamp");
Date d = new Date(timestamp);
String strdate = SDM.format(d);
if(datecount.containsKey(strdate))
{
datecount.put(strdate, datecount.get(strdate)+1);
}
else
{
datecount.put(strdate, 1);
}
} catch (JSONException ex) {
Logger.getLogger(ControlChartExample.class.getName()).log(Level.SEVERE, null, ex);
}
}
ArrayList<DateInfo> dinfos = new ArrayList<DateInfo>();
Set<String> keys = datecount.keySet();
for(String key:keys)
{
DateInfo dinfo = new DateInfo();
try {
dinfo.d = SDM.parse(key);
} catch (ParseException ex) {
ex.printStackTrace();
continue;
}
dinfo.count = datecount.get(key);
dinfos.add(dinfo);
}
double mean = this.GetMean(dinfos);
double stddev = this.GetStandardDev(dinfos, mean);
Collections.sort(dinfos);
//Normalize the trend by subtracting the mean and dividing by standard deviation to get a distribution with 0 mean and a standard deviation of 1
for(DateInfo dinfo:dinfos)
{
try{
JSONObject jobj = new JSONObject();
jobj.put("date", SDM.format(dinfo.d));
jobj.put("count", (dinfo.count-mean)/stddev);
jobj.put("mean", 0);
jobj.put("stdev+3", 3);
jobj.put("stdev-3", -3);
result.put(jobj);
}catch(JSONException ex)
{
ex.printStackTrace();
}
}
}catch(IOException ex)
{
ex.printStackTrace();
}finally{
try {
br.close();
} catch (IOException ex) {
Logger.getLogger(ControlChartExample.class.getName()).log(Level.SEVERE, null, ex);
}
}
return result;
}
public double GetStandardDev(ArrayList<DateInfo> dateinfos,double mean)
{
double intsum = 0;
int numperiods = dateinfos.size();
for(DateInfo dinfo:dateinfos)
{
intsum+=Math.pow((dinfo.count - mean),2);
}
// System.out.println(Math.sqrt((double)intsum/timePeriodCounts.size()));
return Math.sqrt((double)intsum/numperiods);
}
public double GetMean(ArrayList<DateInfo> dateinfos)
{
int numperiods = dateinfos.size();
int sum = 0;
for(DateInfo dinfo:dateinfos)
{
sum +=dinfo.count;
}
// System.out.println((double)sum/numPeriods);
return ((double)sum/numperiods);
}
public static void main(String[] args)
{
ControlChartExample cce = new ControlChartExample();
String infilename = DEF_INFILENAME;
if(args!=null)
{
if(args.length>=1&&!args[0].isEmpty())
{
File fl = new File(args[0]);
if(fl.exists())
{
infilename = args[0];
}
}
}
System.out.println(cce.GenerateDataTrend(infilename));
}
}
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