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The Waikato Environment for Knowledge Analysis (WEKA), a machine learning workbench. This version represents the developer version, the "bleeding edge" of development, you could say. New functionality gets added to this version.
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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 .
 */

/*
 *    LoaderCustomizer.java
 *    Copyright (C) 2002-2012 University of Waikato, Hamilton, New Zealand
 *
 */

package weka.gui.beans;

import weka.core.Environment;
import weka.core.EnvironmentHandler;
import weka.core.converters.DatabaseConverter;
import weka.core.converters.DatabaseLoader;
import weka.core.converters.FileSourcedConverter;
import weka.gui.ExtensionFileFilter;
import weka.gui.GenericObjectEditor;
import weka.gui.PropertySheetPanel;
import weka.gui.WekaFileChooser;

import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFileChooser;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JScrollPane;
import javax.swing.SwingConstants;
import javax.swing.SwingUtilities;
import java.awt.BorderLayout;
import java.awt.Dialog.ModalityType;
import java.awt.FlowLayout;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Window;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;
import java.io.File;
import java.util.Arrays;

/**
 * GUI Customizer for the loader bean
 * 
 * @author Mark Hall
 * @version $Revision: 15104 $
 */
public class LoaderCustomizer extends JPanel implements BeanCustomizer,
  CustomizerCloseRequester, EnvironmentHandler {

  /** for serialization */
  private static final long serialVersionUID = 6990446313118930298L;

  static {
    GenericObjectEditor.registerEditors();
  }

  private final PropertyChangeSupport m_pcSupport = new PropertyChangeSupport(
    this);

  private weka.gui.beans.Loader m_dsLoader;

  private final PropertySheetPanel m_LoaderEditor = new PropertySheetPanel();

  private final WekaFileChooser m_fileChooser = new WekaFileChooser(new File(
    System.getProperty("user.dir")));
  /*
   * private JDialog m_chooserDialog = new
   * JDialog((JFrame)getTopLevelAncestor(), true);
   */

  private Window m_parentWindow;
  private JDialog m_fileChooserFrame;

  private EnvironmentField m_dbaseURLText;

  private EnvironmentField m_userNameText;

  private EnvironmentField m_queryText;

  private EnvironmentField m_keyText;

  private JPasswordField m_passwordText;

  // private JCheckBox m_relativeFilePath; NOT USED

  private EnvironmentField m_fileText;

  private Environment m_env = Environment.getSystemWide();

  private FileEnvironmentField m_dbProps;

  private ModifyListener m_modifyListener;

  private weka.core.converters.Loader m_backup = null;

  public LoaderCustomizer() {
    /*
     * m_fileEditor.addPropertyChangeListener(new PropertyChangeListener() {
     * public void propertyChange(PropertyChangeEvent e) { if (m_dsLoader !=
     * null) { m_dsLoader.setDataSetFile((File)m_fileEditor.getValue()); } } });
     */

    /*
     * try { m_LoaderEditor.addPropertyChangeListener( new
     * PropertyChangeListener() { public void propertyChange(PropertyChangeEvent
     * e) { repaint(); if (m_dsLoader != null) {
     * //System.err.println("Property change!!");
     * m_dsLoader.setLoader(m_dsLoader.getLoader()); } } }); repaint(); } catch
     * (Exception ex) { ex.printStackTrace(); }
     */

    setLayout(new BorderLayout());
    // add(m_fileEditor.getCustomEditor(), BorderLayout.CENTER);
    // add(m_LoaderEditor, BorderLayout.CENTER);
    m_fileChooser.setDialogType(JFileChooser.OPEN_DIALOG);
    m_fileChooser.addActionListener(new ActionListener() {
      @Override
      public void actionPerformed(ActionEvent e) {
        if (e.getActionCommand().equals(JFileChooser.APPROVE_SELECTION)) {
          try {
            File selectedFile = m_fileChooser.getSelectedFile();
            /*
             * EnvironmentField ef = m_environmentFields.get(0);
             * ef.setText(selectedFile.toString());
             */
            m_fileText.setText(selectedFile.toString());

            /*
             * ((FileSourcedConverter)m_dsLoader.getLoader()).
             * setFile(selectedFile); // tell the loader that a new file has
             * been selected so // that it can attempt to load the header
             * //m_dsLoader.setLoader(m_dsLoader.getLoader());
             * m_dsLoader.newFileSelected();
             */
          } catch (Exception ex) {
            ex.printStackTrace();
          }
        }
        // closing
        if (m_fileChooserFrame != null) {
          m_fileChooserFrame.dispose();
        }
      }
    });
  }

  @Override
  public void setParentWindow(Window parent) {
    m_parentWindow = parent;
  }

  private void setUpOther() {
    removeAll();
    add(m_LoaderEditor, BorderLayout.CENTER);

    JPanel buttonsP = new JPanel();
    buttonsP.setLayout(new FlowLayout());
    JButton ok, cancel;
    buttonsP.add(ok = new JButton("OK"));
    buttonsP.add(cancel = new JButton("Cancel"));
    ok.addActionListener(new ActionListener() {
      @Override
      public void actionPerformed(ActionEvent evt) {

        // Tell the editor that we are closing under an OK condition
        // so that it can pass on the message to any customizer that
        // might be in use
        m_LoaderEditor.closingOK();

        // make sure that the beans.Loader passes any changed structure
        // downstream
        try {
          m_dsLoader.newStructure(true);
        } catch (Exception e) {
          e.printStackTrace();
        }

        if (m_parentWindow != null) {
          m_parentWindow.dispose();
        }
      }
    });
    cancel.addActionListener(new ActionListener() {
      @Override
      public void actionPerformed(ActionEvent evt) {

        // Tell the editor that we are closing under a CANCEL condition
        // so that it can pass on the message to any customizer that
        // might be in use
        m_LoaderEditor.closingCancel();

        if (m_parentWindow != null) {
          m_parentWindow.dispose();
        }
      }
    });

    add(buttonsP, BorderLayout.SOUTH);

    validate();
    repaint();
  }

  /** Sets up a customizer window for a Database Connection */
  private void setUpDatabase() {

    removeAll();

    JPanel db = new JPanel();
    GridBagLayout gbLayout = new GridBagLayout();
    // db.setLayout(new GridLayout(6, 1));
    db.setLayout(gbLayout);

    JLabel urlLab = new JLabel("Database URL", SwingConstants.RIGHT);
    urlLab.setBorder(BorderFactory.createEmptyBorder(0, 5, 0, 0));
    GridBagConstraints gbConstraints = new GridBagConstraints();
    gbConstraints.anchor = GridBagConstraints.EAST;
    gbConstraints.fill = GridBagConstraints.HORIZONTAL;
    gbConstraints.gridy = 0;
    gbConstraints.gridx = 0;
    gbLayout.setConstraints(urlLab, gbConstraints);
    db.add(urlLab);

    m_dbaseURLText = new EnvironmentField();
    m_dbaseURLText.setEnvironment(m_env);
    /*
     * int width = m_dbaseURLText.getPreferredSize().width; int height =
     * m_dbaseURLText.getPreferredSize().height;
     * m_dbaseURLText.setMinimumSize(new Dimension(width * 2, height));
     * m_dbaseURLText.setPreferredSize(new Dimension(width * 2, height));
     */
    m_dbaseURLText.setText(((DatabaseConverter) m_dsLoader.getLoader())
      .getUrl());
    gbConstraints = new GridBagConstraints();
    gbConstraints.anchor = GridBagConstraints.EAST;
    gbConstraints.fill = GridBagConstraints.HORIZONTAL;
    gbConstraints.gridy = 0;
    gbConstraints.gridx = 1;
    gbConstraints.weightx = 5;
    gbLayout.setConstraints(m_dbaseURLText, gbConstraints);
    db.add(m_dbaseURLText);

    JLabel userLab = new JLabel("Username", SwingConstants.RIGHT);
    userLab.setBorder(BorderFactory.createEmptyBorder(0, 5, 0, 0));
    gbConstraints = new GridBagConstraints();
    gbConstraints.anchor = GridBagConstraints.EAST;
    gbConstraints.fill = GridBagConstraints.HORIZONTAL;
    gbConstraints.gridy = 1;
    gbConstraints.gridx = 0;
    gbLayout.setConstraints(userLab, gbConstraints);
    db.add(userLab);

    m_userNameText = new EnvironmentField();
    m_userNameText.setEnvironment(m_env);
    /*
     * m_userNameText.setMinimumSize(new Dimension(width * 2, height));
     * m_userNameText.setPreferredSize(new Dimension(width * 2, height));
     */
    m_userNameText.setText(((DatabaseConverter) m_dsLoader.getLoader())
      .getUser());
    gbConstraints = new GridBagConstraints();
    gbConstraints.anchor = GridBagConstraints.EAST;
    gbConstraints.fill = GridBagConstraints.HORIZONTAL;
    gbConstraints.gridy = 1;
    gbConstraints.gridx = 1;
    gbLayout.setConstraints(m_userNameText, gbConstraints);
    db.add(m_userNameText);

    JLabel passwordLab = new JLabel("Password ", SwingConstants.RIGHT);
    passwordLab.setBorder(BorderFactory.createEmptyBorder(0, 5, 0, 0));
    gbConstraints = new GridBagConstraints();
    gbConstraints.anchor = GridBagConstraints.EAST;
    gbConstraints.fill = GridBagConstraints.HORIZONTAL;
    gbConstraints.gridy = 2;
    gbConstraints.gridx = 0;
    gbLayout.setConstraints(passwordLab, gbConstraints);
    db.add(passwordLab);

    m_passwordText = new JPasswordField();
    m_passwordText.setText(((DatabaseLoader) m_dsLoader.getLoader())
      .getPassword());
    JPanel passwordHolder = new JPanel();
    passwordHolder.setLayout(new BorderLayout());
    passwordHolder.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
    // passwordHolder.add(passwordLab, BorderLayout.WEST);
    passwordHolder.add(m_passwordText, BorderLayout.CENTER);
    /*
     * passwordHolder.setMinimumSize(new Dimension(width * 2, height));
     * passwordHolder.setPreferredSize(new Dimension(width * 2, height));
     */
    gbConstraints = new GridBagConstraints();
    gbConstraints.anchor = GridBagConstraints.EAST;
    gbConstraints.fill = GridBagConstraints.HORIZONTAL;
    gbConstraints.gridy = 2;
    gbConstraints.gridx = 1;
    gbLayout.setConstraints(passwordHolder, gbConstraints);
    db.add(passwordHolder);

    JLabel queryLab = new JLabel("Query", SwingConstants.RIGHT);
    queryLab.setBorder(BorderFactory.createEmptyBorder(0, 5, 0, 0));
    gbConstraints = new GridBagConstraints();
    gbConstraints.anchor = GridBagConstraints.EAST;
    gbConstraints.fill = GridBagConstraints.HORIZONTAL;
    gbConstraints.gridy = 3;
    gbConstraints.gridx = 0;
    gbLayout.setConstraints(queryLab, gbConstraints);
    db.add(queryLab);

    m_queryText = new EnvironmentField();
    m_queryText.setEnvironment(m_env);
    /*
     * m_queryText.setMinimumSize(new Dimension(width * 2, height));
     * m_queryText.setPreferredSize(new Dimension(width * 2, height));
     */
    m_queryText.setText(((DatabaseLoader) m_dsLoader.getLoader()).getQuery());
    gbConstraints = new GridBagConstraints();
    gbConstraints.anchor = GridBagConstraints.EAST;
    gbConstraints.fill = GridBagConstraints.HORIZONTAL;
    gbConstraints.gridy = 3;
    gbConstraints.gridx = 1;
    gbLayout.setConstraints(m_queryText, gbConstraints);
    db.add(m_queryText);

    JLabel keyLab = new JLabel("Key columns", SwingConstants.RIGHT);
    keyLab.setBorder(BorderFactory.createEmptyBorder(0, 5, 0, 0));
    gbConstraints = new GridBagConstraints();
    gbConstraints.anchor = GridBagConstraints.EAST;
    gbConstraints.fill = GridBagConstraints.HORIZONTAL;
    gbConstraints.gridy = 4;
    gbConstraints.gridx = 0;
    gbLayout.setConstraints(keyLab, gbConstraints);
    db.add(keyLab);

    m_keyText = new EnvironmentField();
    m_keyText.setEnvironment(m_env);
    /*
     * m_keyText.setMinimumSize(new Dimension(width * 2, height));
     * m_keyText.setPreferredSize(new Dimension(width * 2, height));
     */
    m_keyText.setText(((DatabaseLoader) m_dsLoader.getLoader()).getKeys());
    gbConstraints = new GridBagConstraints();
    gbConstraints.anchor = GridBagConstraints.EAST;
    gbConstraints.fill = GridBagConstraints.HORIZONTAL;
    gbConstraints.gridy = 4;
    gbConstraints.gridx = 1;
    gbLayout.setConstraints(m_keyText, gbConstraints);
    db.add(m_keyText);

    JLabel propsLab = new JLabel("DB config props", SwingConstants.RIGHT);
    propsLab
      .setToolTipText("The custom properties that the user can use to override the default ones.");
    propsLab.setBorder(BorderFactory.createEmptyBorder(0, 5, 0, 0));
    gbConstraints = new GridBagConstraints();
    gbConstraints.anchor = GridBagConstraints.EAST;
    gbConstraints.fill = GridBagConstraints.HORIZONTAL;
    gbConstraints.gridy = 5;
    gbConstraints.gridx = 0;
    gbLayout.setConstraints(propsLab, gbConstraints);
    db.add(propsLab);

    m_dbProps = new FileEnvironmentField();
    m_dbProps.setEnvironment(m_env);
    m_dbProps.resetFileFilters();
    m_dbProps.addFileFilter(new ExtensionFileFilter(".props",
      "DatabaseUtils property file (*.props)"));
    gbConstraints = new GridBagConstraints();
    gbConstraints.anchor = GridBagConstraints.EAST;
    gbConstraints.fill = GridBagConstraints.HORIZONTAL;
    gbConstraints.gridy = 5;
    gbConstraints.gridx = 1;
    gbLayout.setConstraints(m_dbProps, gbConstraints);
    db.add(m_dbProps);
    File toSet = ((DatabaseLoader) m_dsLoader.getLoader()).getCustomPropsFile();
    if (toSet != null) {
      m_dbProps.setText(toSet.getPath());
    }

    JButton loadPropsBut = new JButton("Load");
    loadPropsBut.setToolTipText("Load config");
    gbConstraints = new GridBagConstraints();
    gbConstraints.anchor = GridBagConstraints.EAST;
    gbConstraints.fill = GridBagConstraints.HORIZONTAL;
    gbConstraints.gridy = 5;
    gbConstraints.gridx = 2;
    gbLayout.setConstraints(loadPropsBut, gbConstraints);
    db.add(loadPropsBut);
    loadPropsBut.addActionListener(new ActionListener() {
      @Override
      public void actionPerformed(ActionEvent e) {
        if (m_dbProps.getText() != null && m_dbProps.getText().length() > 0) {
          String propsS = m_dbProps.getText();
          try {
            propsS = m_env.substitute(propsS);
          } catch (Exception ex) {
          }
          File propsFile = new File(propsS);
          if (propsFile.exists()) {
            ((DatabaseLoader) m_dsLoader.getLoader())
              .setCustomPropsFile(propsFile);
            ((DatabaseLoader) m_dsLoader.getLoader()).resetOptions();
            m_dbaseURLText.setText(((DatabaseLoader) m_dsLoader.getLoader())
              .getUrl());
          }
        }
      }
    });

    JPanel buttonsP = new JPanel();
    buttonsP.setLayout(new FlowLayout());
    JButton ok, cancel;
    buttonsP.add(ok = new JButton("OK"));
    buttonsP.add(cancel = new JButton("Cancel"));
    ok.addActionListener(new ActionListener() {
      @Override
      public void actionPerformed(ActionEvent evt) {
        /*
         * ((DatabaseLoader)m_dsLoader.getLoader()).resetStructure();
         * ((DatabaseConverter
         * )m_dsLoader.getLoader()).setUrl(m_dbaseURLText.getText());
         * ((DatabaseConverter
         * )m_dsLoader.getLoader()).setUser(m_userNameText.getText());
         * ((DatabaseConverter)m_dsLoader.getLoader()).setPassword(new
         * String(m_passwordText.getPassword()));
         * ((DatabaseLoader)m_dsLoader.getLoader
         * ()).setQuery(m_queryText.getText());
         * ((DatabaseLoader)m_dsLoader.getLoader
         * ()).setKeys(m_keyText.getText());
         */

        if (resetAndUpdateDatabaseLoaderIfChanged()) {
          try {
            // m_dsLoader.notifyStructureAvailable(((DatabaseLoader)m_dsLoader.getLoader()).getStructure());
            // database connection has been configured
            m_dsLoader.setDB(true);
          } catch (Exception ex) {
          }
        }
        if (m_parentWindow != null) {
          m_parentWindow.dispose();
        }
      }
    });
    cancel.addActionListener(new ActionListener() {
      @Override
      public void actionPerformed(ActionEvent evt) {
        if (m_backup != null) {
          m_dsLoader.setLoader(m_backup);
        }

        if (m_parentWindow != null) {
          m_parentWindow.dispose();
        }
      }
    });

    JPanel holderP = new JPanel();
    holderP.setLayout(new BorderLayout());
    holderP.add(db, BorderLayout.NORTH);
    holderP.add(buttonsP, BorderLayout.SOUTH);

    // db.add(buttonsP);
    JPanel about = m_LoaderEditor.getAboutPanel();
    if (about != null) {
      add(about, BorderLayout.NORTH);
    }
    add(holderP, BorderLayout.SOUTH);
  }

  private boolean resetAndUpdateDatabaseLoaderIfChanged() {
    DatabaseLoader dbl = (DatabaseLoader) m_dsLoader.getLoader();
    String url = dbl.getUrl();
    String user = dbl.getUser();
    String password = dbl.getPassword();
    String query = dbl.getQuery();
    String keys = dbl.getKeys();
    File propsFile = dbl.getCustomPropsFile();

    boolean update = (!url.equals(m_dbaseURLText.getText())
      || !user.equals(m_userNameText.getText())
      || !Arrays.equals(password.toCharArray(), m_passwordText.getPassword())
      || !query.equalsIgnoreCase(m_queryText.getText()) || !keys
      .equals(m_keyText.getText()));

    if (propsFile != null && m_dbProps.getText().length() > 0) {
      update = (update || !propsFile.toString().equals(m_dbProps.getText()));
    } else {
      update = (update || m_dbProps.getText().length() > 0);
    }

    if (update) {
      dbl.resetStructure();
      dbl.setUrl(m_dbaseURLText.getText());
      dbl.setUser(m_userNameText.getText());
      dbl.setPassword(new String(m_passwordText.getPassword()));
      dbl.setQuery(m_queryText.getText());
      dbl.setKeys(m_keyText.getText());
      if (m_dbProps.getText() != null && m_dbProps.getText().length() > 0) {
        dbl.setCustomPropsFile(new File(m_dbProps.getText()));
      }
    }

    return update;
  }

  public void setUpFile() {
    removeAll();

    boolean currentFileIsDir = false;
    File tmp = ((FileSourcedConverter) m_dsLoader.getLoader()).retrieveFile();
    String tmpString = tmp.toString();
    if (Environment.containsEnvVariables(tmpString)) {
      try {
        tmpString = m_env.substitute(tmpString);
      } catch (Exception ex) {
        // ignore
      }
    }
    File tmp2 = new File((new File(tmpString)).getAbsolutePath());

    if (tmp2.isDirectory()) {
      m_fileChooser.setCurrentDirectory(tmp2);
      currentFileIsDir = true;
    } else {
      m_fileChooser.setSelectedFile(tmp2);
    }

    FileSourcedConverter loader = (FileSourcedConverter) m_dsLoader.getLoader();
    String[] ext = loader.getFileExtensions();
    ExtensionFileFilter firstFilter = null;
    for (int i = 0; i < ext.length; i++) {
      ExtensionFileFilter ff = new ExtensionFileFilter(ext[i],
        loader.getFileDescription() + " (*" + ext[i] + ")");
      if (i == 0) {
        firstFilter = ff;
      }
      m_fileChooser.addChoosableFileFilter(ff);
    }
    if (firstFilter != null) {
      m_fileChooser.setFileFilter(firstFilter);
    }
    JPanel about = m_LoaderEditor.getAboutPanel();
    JPanel northPanel = new JPanel();
    northPanel.setLayout(new BorderLayout());
    if (about != null) {
      northPanel.add(about, BorderLayout.NORTH);
    }
    add(northPanel, BorderLayout.NORTH);

    final EnvironmentField ef = new EnvironmentField();
    JPanel efHolder = new JPanel();
    efHolder.setLayout(new BorderLayout());

    ef.setEnvironment(m_env);
    /*
     * int width = ef.getPreferredSize().width; int height =
     * ef.getPreferredSize().height; // ef.setMinimumSize(new Dimension(width *
     * 2, height)); ef.setPreferredSize(new Dimension(width * 2, height));
     */
    m_fileText = ef;

    // only set the text on the EnvironmentField if the current file is not a
    // directory
    if (!currentFileIsDir) {
      ef.setText(tmp.toString());
    }

    efHolder.add(ef, BorderLayout.CENTER);
    JButton browseBut = new JButton("Browse...");
    browseBut.addActionListener(new ActionListener() {
      @Override
      public void actionPerformed(ActionEvent e) {
        try {
          // final JFrame jf = new JFrame("Choose file");
          final JDialog jf = new JDialog((JDialog) LoaderCustomizer.this
            .getTopLevelAncestor(), "Choose file", ModalityType.DOCUMENT_MODAL);
          jf.setLayout(new BorderLayout());
          // jf.getContentPane().setLayout(new BorderLayout());
          jf.getContentPane().add(m_fileChooser, BorderLayout.CENTER);
          m_fileChooserFrame = jf;
          jf.pack();
          jf.setLocationRelativeTo(SwingUtilities.getWindowAncestor(LoaderCustomizer.this));
          jf.setVisible(true);
        } catch (Exception ex) {
          ex.printStackTrace();
        }
      }
    });

    JPanel bP = new JPanel();
    bP.setLayout(new BorderLayout());
    bP.setBorder(BorderFactory.createEmptyBorder(5, 0, 5, 5));
    bP.add(browseBut, BorderLayout.CENTER);
    efHolder.add(bP, BorderLayout.EAST);
    JPanel alignedP = new JPanel();
    alignedP.setBorder(BorderFactory.createTitledBorder("File"));
    alignedP.setLayout(new BorderLayout());
    JLabel efLab = new JLabel("Filename", SwingConstants.RIGHT);
    efLab.setBorder(BorderFactory.createEmptyBorder(0, 5, 0, 0));
    alignedP.add(efLab, BorderLayout.WEST);
    alignedP.add(efHolder, BorderLayout.CENTER);

    northPanel.add(alignedP, BorderLayout.SOUTH);

    JPanel butHolder = new JPanel();
    // butHolder.setLayout(new GridLayout(1,2));
    butHolder.setLayout(new FlowLayout());
    JButton OKBut = new JButton("OK");
    OKBut.addActionListener(new ActionListener() {
      @Override
      public void actionPerformed(ActionEvent e) {
        try {
          ((FileSourcedConverter) m_dsLoader.getLoader()).setFile(new File(ef
            .getText()));
          // tell the loader that a new file has been selected so
          // that it can attempt to load the header
          // m_dsLoader.setLoader(m_dsLoader.getLoader());
          m_dsLoader.newFileSelected();
        } catch (Exception ex) {
          ex.printStackTrace();
        }
        if (m_modifyListener != null) {
          m_modifyListener.setModifiedStatus(LoaderCustomizer.this, true);
        }
        m_parentWindow.dispose();
      }
    });

    JButton CancelBut = new JButton("Cancel");
    CancelBut.addActionListener(new ActionListener() {
      @Override
      public void actionPerformed(ActionEvent e) {
        if (m_modifyListener != null) {
          m_modifyListener.setModifiedStatus(LoaderCustomizer.this, false);
        }

        if (m_backup != null) {
          m_dsLoader.setLoader(m_backup);
        }

        m_parentWindow.dispose();
      }
    });

    butHolder.add(OKBut);
    butHolder.add(CancelBut);

    JPanel optionsHolder = new JPanel();
    optionsHolder.setLayout(new BorderLayout());
    optionsHolder.setBorder(BorderFactory.createTitledBorder("Other options"));

    optionsHolder.add(m_LoaderEditor, BorderLayout.SOUTH);
    JScrollPane scroller = new JScrollPane(optionsHolder);

    add(scroller, BorderLayout.CENTER);

    add(butHolder, BorderLayout.SOUTH);
  }

  /**
   * Set the loader to be customized
   * 
   * @param object a weka.gui.beans.Loader
   */
  @Override
  public void setObject(Object object) {
    m_dsLoader = (weka.gui.beans.Loader) object;

    try {
      m_backup = (weka.core.converters.Loader) GenericObjectEditor
        .makeCopy(m_dsLoader.getLoader());
    } catch (Exception ex) {
      // ignore
    }

    m_LoaderEditor.setTarget(m_dsLoader.getLoader());
    // m_fileEditor.setValue(m_dsLoader.getDataSetFile());
    m_LoaderEditor.setEnvironment(m_env);
    if (m_dsLoader.getLoader() instanceof FileSourcedConverter) {
      setUpFile();
    } else {
      if (m_dsLoader.getLoader() instanceof DatabaseConverter) {
        setUpDatabase();
      } else {
        setUpOther();
      }
    }
  }

  @Override
  public void setEnvironment(Environment env) {
    m_env = env;
  }

  /**
   * Add a property change listener
   * 
   * @param pcl a PropertyChangeListener value
   */
  @Override
  public void addPropertyChangeListener(PropertyChangeListener pcl) {
    m_pcSupport.addPropertyChangeListener(pcl);
  }

  /**
   * Remove a property change listener
   * 
   * @param pcl a PropertyChangeListener value
   */
  @Override
  public void removePropertyChangeListener(PropertyChangeListener pcl) {
    m_pcSupport.removePropertyChangeListener(pcl);
  }

  @Override
  public void setModifiedListener(ModifyListener l) {
    m_modifyListener = l;
  }
}