/**
* Updates the data set for both charts with the contents of the supplied Hashtable. The Hashtable
* is expected to contain the following items:
*
* <ul>
* <li>down - The number of links currently in a down state
* <li>up - The number of links currently in an up state
* <li>unknown - The number of links currently in an unknown state
* </ul>
*
* @param linkStats The hashtable containing the entries indicating current link statistics.
*/
public void updateData(Hashtable<String, Integer> linkStats) {
dpdCurrentData.insertValue(0, "Link Down", linkStats.get("down"));
dpdCurrentData.insertValue(1, "Link Up", linkStats.get("up"));
dpdCurrentData.insertValue(2, "Link State Unknown", linkStats.get("unknown"));
dcdPreviousData.addValue(
linkStats.get("down"), "Link Down", Calendar.getInstance().getTime().toString());
dcdPreviousData.addValue(
linkStats.get("up"), "Link Up", Calendar.getInstance().getTime().toString());
dcdPreviousData.addValue(
linkStats.get("unknown"),
"Link State Unknown",
Calendar.getInstance().getTime().toString());
}
protected void update() {
// We have to rebuild the dataset from scratch (deleting and replacing it) because JFreeChart's
// piechart facility doesn't have a way to move series. Just like the histogram system: stupid
// stupid stupid.
SeriesAttributes[] sa = getSeriesAttributes();
DefaultCategoryDataset dataset = new DefaultCategoryDataset();
for (int i = 0; i < sa.length; i++)
if (sa[i].isPlotVisible()) {
PieChartSeriesAttributes attributes = (PieChartSeriesAttributes) (sa[i]);
Object[] elements = attributes.getElements();
double[] values = null;
String[] labels = null;
if (elements != null) {
HashMap map = convertIntoAmountsAndLabels(elements);
labels = revisedLabels(map);
values = amounts(map, labels);
} else {
values = attributes.getValues();
labels = attributes.getLabels();
}
UniqueString seriesName = new UniqueString(attributes.getSeriesName());
for (int j = 0; j < values.length; j++)
dataset.addValue(values[j], labels[j], seriesName); // ugh
}
setSeriesDataset(dataset);
}
public String generateBarChart(
String hitSection, HttpSession session, PrintWriter pw, String courseId, int studentId) {
/* int groupId=0;
if (groupName.equals("All")){
groupId=0;
}else{
groupId = studStatisticBean.getGroupIdByName(groupName);
}*/
String filename = null;
try {
// Retrieve list of WebHits
StudentsConceptChartDataSet cDataSet =
new StudentsConceptChartDataSet(studStatisticBean, courseId, studentId);
ArrayList list = cDataSet.getDataBySection(hitSection);
// Throw a custom NoDataException if there is no data
if (list.size() == 0) {
System.out.println("No data has been found");
throw new NoDataException();
}
// Create and populate a CategoryDataset
Iterator iter = list.listIterator();
DefaultCategoryDataset dataSet = new DefaultCategoryDataset();
while (iter.hasNext()) {
StudentsConceptHit wh = (StudentsConceptHit) iter.next();
// Comparable c1= Double.parseDouble(wh.getHitDegree());
dataSet.addValue(
wh.getHitDegree(),
"degree of mastery for concept ",
String.valueOf(wh.getHitConcept()));
}
// Create the chart object
CategoryAxis categoryAxis = new CategoryAxis("Concepts");
ValueAxis valueAxis = new NumberAxis("Degree of Mastery");
valueAxis.setRange(0.0, 6.0);
categoryAxis.setCategoryLabelPositions(
new CategoryLabelPositions().createUpRotationLabelPositions(45));
BarRenderer renderer = new BarRenderer();
renderer.setDrawBarOutline(true);
renderer.setItemURLGenerator(
new StandardCategoryURLGenerator("xy_chart.jsp", "series", "section"));
StandardCategoryToolTipGenerator scttg = new StandardCategoryToolTipGenerator();
renderer.setToolTipGenerator(scttg);
Plot plot = new CategoryPlot(dataSet, categoryAxis, valueAxis, renderer);
JFreeChart chart = new JFreeChart("", JFreeChart.DEFAULT_TITLE_FONT, plot, true);
chart.setBackgroundPaint(java.awt.Color.white);
// Write the chart image to the temporary directory
ChartRenderingInfo info = new ChartRenderingInfo(new StandardEntityCollection());
filename = ServletUtilities.saveChartAsPNG(chart, 600, 400, info, session);
// Write the image map to the PrintWriter
ChartUtilities.writeImageMap(pw, filename, info);
pw.flush();
} catch (NoDataException e) {
System.out.println(e.toString());
filename = "public_nodata_500x300.png";
} catch (Exception e) {
System.out.println("Exception - " + e.toString());
e.printStackTrace(System.out);
filename = "public_error_500x300.png";
}
return filename;
}
/**
* Initialises the class and internal logger. Uses the supplied arguments to receive data from the
* application and add data to the charts dynamically.
*
* @param title The title of the charts on display. Whether the displayed data is for <code>new
* </code> or <code>old</code> links. That is whether the data is for newly discovered links
* or existing (old) links already stored within the database.
* @param parent The instance of <code>COMPortClient</code> that acts as the data source for the
* charts.
*/
public LinkChart(String title, COMPortClient parent) {
super("Charts", true, true, true, true);
super.setLayer(1);
identifier = title.toLowerCase();
// Obtain an instance of Logger for the class
log = LoggerFactory.getLogger(className);
owner = parent;
// Setup a hashtable to hold the values for up, down and unknown link states
Hashtable<String, Integer> linkStats = new Hashtable<String, Integer>();
if (identifier.equals("old")) {
this.setTitle("Recognised Link Status on " + owner.getPortName() + ":");
// Get the current figures from the link table
linkStats = ((LinkTable) owner.getLinkTable().getModel()).getInitialFigures();
} else if (identifier.equals("new")) {
this.setTitle("Discovered Link Status on " + owner.getPortName() + ":");
linkStats = ((LinkTable) owner.getNewLinkTable().getModel()).getInitialFigures();
} else {
// If the identifier was set to something other than old or new then it's not right.
log.warning("An instance of LinkChart has been created for an unknown purpose.");
return;
}
// Initialise the dataset for the pie chart
dpdCurrentData = new DefaultPieDataset();
dpdCurrentData.insertValue(0, "Link Down", linkStats.get("down"));
dpdCurrentData.insertValue(1, "Link Up", linkStats.get("up"));
dpdCurrentData.insertValue(2, "Link State Unknown", linkStats.get("unknown"));
// Initialise the dataset for the line chart
dcdPreviousData = new DefaultCategoryDataset();
dcdPreviousData.addValue(
linkStats.get("down"), "Link Down", Calendar.getInstance().getTime().toString());
dcdPreviousData.addValue(
linkStats.get("up"), "Link Up", Calendar.getInstance().getTime().toString());
dcdPreviousData.addValue(
linkStats.get("unknown"),
"Link State Unknown",
Calendar.getInstance().getTime().toString());
// Set the variables we need for holding the charts
JFreeChart jfcCurrentStatus; // This will be displayed as a pie chart
JFreeChart jfcPreviousStatus; // This will be displayed as a line chart
ChartPanel cpCurrent; // Chartpanels hold the JFreeChart
ChartPanel cpPrevious;
// Use the factory to create the charts
jfcCurrentStatus =
ChartFactory.createPieChart("Current Status", dpdCurrentData, true, true, false);
jfcPreviousStatus =
ChartFactory.createLineChart(
"Previous Status",
"Time received",
"Number of Links",
dcdPreviousData,
PlotOrientation.VERTICAL,
true,
true,
false);
// Add them to the chart panels
cpCurrent = new ChartPanel(jfcCurrentStatus);
cpPrevious = new ChartPanel(jfcPreviousStatus);
// Add the chart panels to the content pane
this.add(cpCurrent, BorderLayout.EAST);
this.add(cpPrevious, BorderLayout.WEST);
// Change the layout to show them next to each other
this.setLayout(new GridLayout(1, 2));
// Add a listener to the window
this.addInternalFrameListener(new CloseLinkChart(this));
log.finest("Adding frame to the desktop");
// Set the window properties and display it
Client.getJNWindow().addToDesktop(this);
this.setDefaultCloseOperation(DISPOSE_ON_CLOSE);
this.setSize(650, 400);
this.setVisible(true);
owner.addChartWindow(title, this);
}
