Display /proc/meminfo on JavaFX PieChart

Last post "Display /proc/meminfo on JavaFX TableView", it will be shown in PieChart form.

Please notice that this example aim to show data in chart form, not the actual presentation of memory allocation; for example, memFree should be a sub-set of memFree, not anoth section as shown on the piechart.

package javafx_meminfo;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.stream.Stream;
import javafx.application.Application;
import javafx.beans.property.SimpleFloatProperty;
import javafx.beans.property.SimpleIntegerProperty;
import javafx.beans.property.SimpleStringProperty;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.scene.Scene;
import javafx.scene.chart.PieChart;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

/**
 *
 * @web http://java-buddy.blogspot.com/
 */
public class JavaFX_meminfo extends Application {

    final static String FILE_MEMINFO = "/proc/meminfo";

    private final TableView<Record> tableMem = new TableView<>();
    ObservableList<Record> listRecords = FXCollections.observableArrayList();
    
    ObservableList<PieChart.Data> pieChartData =
                FXCollections.observableArrayList();
    PieChart chart = new PieChart(pieChartData);

    @Override
    public void start(Stage primaryStage) {

        prepareMemInfo();
        tableMem.setEditable(false);

        TableColumn colMemField = new TableColumn("Field");
        colMemField.setMinWidth(150);
        colMemField.setCellValueFactory(
            new PropertyValueFactory<>("memField"));
        
        TableColumn colMemValue = new TableColumn("Value");
        colMemValue.setMinWidth(100);
        colMemValue.setCellValueFactory(
            new PropertyValueFactory<>("memValue"));
        
        TableColumn colMemUnit = new TableColumn("Unit");
        colMemUnit.setMinWidth(50);
        colMemUnit.setCellValueFactory(
            new PropertyValueFactory<>("memUnit"));
        
        TableColumn colMemQty = new TableColumn("Qty");
        colMemQty.setMinWidth(200);
        colMemQty.setCellValueFactory(
            new PropertyValueFactory<>("memQty"));
        
        tableMem.setItems(listRecords);
        tableMem.getColumns().addAll(colMemField, 
            colMemValue, colMemUnit, colMemQty);

        StackPane root = new StackPane();
        root.getChildren().add(tableMem);

        Scene scene = new Scene(root, 500, 250);

        primaryStage.setTitle("java-buddy");
        primaryStage.setScene(scene);
        primaryStage.show();
        
        //Open second window
        chart.setTitle(FILE_MEMINFO);
        
        StackPane secondaryLayout = new StackPane();
        secondaryLayout.getChildren().add(chart);
                 
        Scene secondScene = new Scene(secondaryLayout, 400, 300);
 
        Stage secondStage = new Stage();
        secondStage.setTitle("Second Stage");
        secondStage.setScene(secondScene);
                 
        //Set position of second window, related to primary window.
        secondStage.setX(primaryStage.getX() + 250);
        secondStage.setY(primaryStage.getY() + 100);
        secondStage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }

    private void prepareMemInfo() {

        Stream<String> streamMemInfo = readFile(FILE_MEMINFO);
        streamMemInfo.forEach((line) -> {
            System.out.println(line);

            //split one line by whitespace/grouped whitespaces
            String[] oneLine = line.split("\\s+");

            for (String ele : oneLine) {
                System.out.println(ele);
            }

            System.out.println("---");

            String rField = "";
            int rMemValue = 0;
            String rMemUnit = "";

            if (oneLine.length <= 3) {
                if (oneLine.length == 3) {
                    rField = oneLine[0];
                    rMemValue = Integer.parseInt(oneLine[1]);
                    rMemUnit = oneLine[2];
                } else if (oneLine.length == 2) {
                    rField = oneLine[0];
                    rMemValue = Integer.parseInt(oneLine[1]);
                    rMemUnit = "B";
                } else if (oneLine.length == 1) {
                    rField = oneLine[0];
                    rMemValue = 0;
                    rMemUnit = "B";
                }

                Record record = new Record(
                    rField, rMemValue, rMemUnit);
                listRecords.add(record);
                
                pieChartData.add(new PieChart.Data(
                    record.getMemField(), record.getMemQty()));
            }

        });
    }

    private Stream<String> readFile(String filePath) {
        Path path = Paths.get(FILE_MEMINFO);

        Stream<String> fileLines = null;
        try {
            fileLines = Files.lines(path);
        } catch (IOException ex) {
            Logger.getLogger(JavaFX_meminfo.class.getName()).log(Level.SEVERE, null, ex);
        }

        return fileLines;
    }

    public static class Record {

        private final SimpleStringProperty memField;
        private final SimpleIntegerProperty memValue;
        private final SimpleStringProperty memUnit;
        private final SimpleFloatProperty memQty;

        private Record(String memField, int memValue, String memUnit) {
            this.memField = new SimpleStringProperty(memField);
            
            this.memValue = new SimpleIntegerProperty(memValue);
            this.memUnit = new SimpleStringProperty(memUnit);
            if (memValue == 0) {
                this.memQty = new SimpleFloatProperty(0.0f);
            } else if (memUnit.equalsIgnoreCase("MB")) {
                this.memQty = new SimpleFloatProperty((float)memValue * 1000000.0f);
            } else if (memUnit.equalsIgnoreCase("kB")) {
                this.memQty = new SimpleFloatProperty((float)memValue * 1000.0f);
            }else {
                this.memQty = new SimpleFloatProperty((float)memValue);
            }
        }

        public String getMemField() {
            return memField.get();
        }

        public int getMemValue() {
            return memValue.get();
        }

        public String getMemUnit() {
            return memUnit.get();
        }

        public float getMemQty() {
            return memQty.get();
        }

    }

}