Example usage for org.jfree.data.general DefaultPieDataset remove

Introduction

In this page you can find the example usage for org.jfree.data.general DefaultPieDataset remove.

Prototype

public void remove(Comparable key) 

Source Link

Document

Removes an item from the dataset and sends a DatasetChangeEvent to all registered listeners.

Usage

From source file:org.sakaiproject.sitestats.impl.chart.ChartServiceImpl.java

private AbstractDataset getPieDataset(Report report) {
    List<Stat> reportData = report.getReportData();

    // fill dataset
    DefaultPieDataset dataSet = new DefaultPieDataset();
    String dataSource = report.getReportDefinition().getReportParams().getHowChartSource();
    //int total = 0;
    double total = 0;
    for (Stat s : reportData) {
        Comparable key = getStatValue(s, dataSource);
        if (key != null) {
            try {
                Number existingValue = dataSet.getValue(key);
                dataSet.setValue(key, getTotalValue(existingValue, s, report));
                total += getTotalValue(s, report).doubleValue();
            } catch (UnknownKeyException e) {
                dataSet.setValue(key, getTotalValue(s, report));
                total += getTotalValue(s, report).doubleValue();
            }/*  w w  w . ja  v  a2 s . c o  m*/
        }
    }

    // sort
    dataSet.sortByValues(SortOrder.DESCENDING);

    // fill in final key values in dataset
    // show only top values (aggregate remaining in 'others')
    int maxDisplayedItems = 10;
    int currItem = 1;
    Number othersValues = Integer.valueOf(0);
    List<Comparable> keys = dataSet.getKeys();
    for (Comparable key : keys) {
        Number existingValue = dataSet.getValue(key);
        if (currItem < maxDisplayedItems) {
            // re-compute values
            double percentage = (double) existingValue.doubleValue() * 100 / total;
            double valuePercentage = Util.round(percentage, (percentage > 0.1) ? 1 : 2);
            // replace key with updated label
            StringBuilder keyStr = new StringBuilder(key.toString());
            keyStr.append(' ');
            keyStr.append(valuePercentage);
            keyStr.append("% (");
            if ((double) existingValue.intValue() == existingValue.doubleValue())
                keyStr.append(existingValue.intValue());
            else
                keyStr.append(existingValue.doubleValue());
            keyStr.append(")");
            dataSet.remove(key);
            dataSet.setValue(keyStr.toString(), existingValue);
        } else {
            othersValues = Integer.valueOf(othersValues.intValue() + existingValue.intValue());
            dataSet.remove(key);
        }
        currItem++;
    }
    // compute "Others" value
    if (othersValues.intValue() > 0) {
        double percentage = (double) othersValues.doubleValue() * 100 / total;
        double valuePercentage = Util.round(percentage, (percentage > 0.1) ? 1 : 2);
        // replace key with updated label
        StringBuilder keyStr = new StringBuilder(msgs.getString("pie_chart_others"));
        keyStr.append(' ');
        keyStr.append(valuePercentage);
        keyStr.append("% (");
        if ((double) othersValues.intValue() == othersValues.doubleValue())
            keyStr.append(othersValues.intValue());
        else
            keyStr.append(othersValues.doubleValue());
        keyStr.append(")");
        dataSet.setValue(keyStr.toString(), othersValues);
    }

    return dataSet;
}

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