cz.cuni.mff.ksi.jinfer.attrstats.JFCWrapper.java Source code

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Here is the source code for cz.cuni.mff.ksi.jinfer.attrstats.JFCWrapper.java

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/*
 * Copyright (C) 2011 vektor
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package cz.cuni.mff.ksi.jinfer.attrstats;

import cz.cuni.mff.ksi.jinfer.attrstats.objects.AttributeTreeNode;
import cz.cuni.mff.ksi.jinfer.base.objects.nodes.Attribute;
import java.awt.Dimension;
import java.awt.Font;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import javax.swing.JPanel;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.PiePlot;
import org.jfree.data.general.DefaultPieDataset;
import org.jfree.data.general.PieDataset;

/**
 * Library class encapsulating the JFreeChart logic.
 *
 * @author vektor
 */
public final class JFCWrapper {

    private JFCWrapper() {
    }

    /**
     * Creates a {@link JPanel} containing a pie chart describing the content of
     * the provided {@link Attribute}s.
     *
     * @param nodes List of attribute nodes to display.
     * @return Panel containing the requested graph.
     */
    public static JPanel createGraphPanel(final List<AttributeTreeNode> nodes) {
        final List<String> content = new ArrayList<String>();
        for (final AttributeTreeNode atn : nodes) {
            content.addAll(atn.getContent());
        }
        return createGraphPanel(getChartTitle(nodes), content);
    }

    private static String getChartTitle(final List<AttributeTreeNode> nodes) {
        if (nodes.size() == 1) {
            return nodes.get(0).getElementName() + "@" + nodes.get(0).getAttributeName();
        }
        return "Multiple attributes";
    }

    /**
     * Creates a {@link JPanel} containing a pie chart with provided title,
     * visualizing the domain of the provided {@link Attribute#content}.
     *
     * @param title Graph title.
     * @param content Content of the {@link Attribute} to be visualized. Each
     * value of this content is represented with weight according to the number of
     * times it is found there.
     * @return JPanel containing a constructed JFreeChart pie chart.
     */
    private static JPanel createGraphPanel(final String title, final List<String> content) {
        final ChartPanel ret = new ChartPanel(createChart(title, createDataset(content)));
        ret.setPreferredSize(new Dimension(320, 240));
        return ret;
    }

    private static PieDataset createDataset(final List<String> content) {
        final DefaultPieDataset dataset = new DefaultPieDataset();

        Collections.sort(content);

        String last = null;
        int count = 1;

        for (final String s : content) {
            if (!s.equals(last)) {
                // output the last group
                if (last != null) {
                    dataset.setValue(last, count);
                }
                // start a new group
                last = s;
                count = 1;
            }
            count++;
        }

        if (last != null) {
            dataset.setValue(last, count);
        }

        return dataset;
    }

    private static JFreeChart createChart(final String title, final PieDataset dataset) {
        final JFreeChart chart = ChartFactory.createPieChart(title, dataset, false, true, false);

        final PiePlot plot = (PiePlot) chart.getPlot();
        plot.setLabelFont(new Font("SansSerif", Font.PLAIN, 12));
        plot.setNoDataMessage("No data available");
        plot.setCircular(true);
        plot.setLabelGap(0.02);
        return chart;
    }

}