Javafx and Java 8 ("WikiViz 2")

On my previous WikiViz  post i showed a barchart displaying data sets from Wikimedia blog and .In this post am going to talk about java 8 specifically the Stream api ,and how its easy to query data very effectively .

Then we finish with some visualization of course.Here i used the charts4j MapChart click to view an example code.

I will start with java 8 and finish with just one line of code in javafx.

The data set can be downloaded here.

Java 8

The Collection API 

 List<String>  lines=Files.readAllLines(path);

  List<String> data=new ArrayList<>();

            for(String s:lines){

                  if(lines.contains(project)){

                    String[] item = s.split("\t");//tab separated values  

                    data.add(item[3]+","+item[4]);

                  }

            }

The Stream API

    List<String> data=lines.stream()

                    .filter(key->key.contains(project))

                    .map(line->line.split("\t"))

                    .map(l->l[3]+","+l[4].replaceAll("\"", ""))//remove quotes

                    .collect(toList());//result is a List of Value and Country iso

Building the MapChart   

  List<PoliticalBoundary> country_list=new ArrayList<>();

  for (String s : data) {

                String []item=s.split(",");

                Country country=new Country(Country.Code.valueOf(item[1]),Integer.parseInt(item[0]));

                country_list.add(country);

            }

      MapChart chart = GCharts.newMapChart(GeographicalArea.WORLD);

      chart.addPoliticalBoundaries(country_list);//

      chart.setColorGradient(GRAY,YELLOW,RED);

      chart.setBackgroundFill(Fills.newSolidFill(Color.BLACK));

To build the chart you call chart.toURLString(); returns  a url.

You need an internet connection for this.

Javafx

In javafx the ImageView node displays an Image from a resource i.e file,web

ImageView image_view=new ImageView("file:file.png");//file

ImageView image_view=new ImageView(url);// url that easy

The results