meka.gui.modelviewer.renderers.InstancesRenderer.java Source code

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Here is the source code for meka.gui.modelviewer.renderers.InstancesRenderer.java

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/*
 *   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/>.
 */

/**
 * PlainTextRenderer.java
 * Copyright (C) 2015 University of Waikato, Hamilton, NZ
 */

package meka.gui.modelviewer.renderers;

import com.googlecode.jfilechooserbookmarks.gui.BaseScrollPane;
import weka.core.ClassDiscovery;
import weka.core.Instances;
import weka.gui.arffviewer.ArffSortedTableModel;
import weka.gui.arffviewer.ArffTable;

import javax.swing.*;
import java.awt.*;

/**
 * Renders Instances objects.
 *
 * @author FracPete (fracpete at waikato dot ac dot nz)
 * @version $Revision$
 */
public class InstancesRenderer extends AbstractObjectRenderer {

    private static final long serialVersionUID = -3528006886476495175L;

    /**
     * Checks whether the renderer can handle the specified class.
     *
     * @param cls      the class to check
     * @return      true if the renderer can handle this type of object
     */
    @Override
    public boolean handles(Class cls) {
        return (ClassDiscovery.isSubclass(Instances.class, cls));
    }

    /**
     * Performs the actual rendering.
     *
     * @param obj      the object to render
     * @param panel   the panel to render into
     * @return      null if successful, otherwise error message
     */
    @Override
    protected String doRender(Object obj, JPanel panel) {
        ArffTable table;
        Instances data;

        data = (Instances) obj;
        // bug in weka, cannot render empty dataset
        if (data.numInstances() == 0)
            return new PlainTextRenderer().render(obj, panel);

        table = new ArffTable(new ArffSortedTableModel(data));
        panel.add(new BaseScrollPane(table), BorderLayout.CENTER);

        return null;
    }
}