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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 .
 */

/*
 * ArffPanel.java
 * Copyright (C) 2005-2012 University of Waikato, Hamilton, New Zealand
 *
 */

package weka.gui.arffviewer;

import weka.core.Instances;
import weka.core.Undoable;
import weka.core.Utils;
import weka.core.converters.AbstractFileLoader;
import weka.gui.ComponentHelper;
import weka.gui.JTableHelper;
import weka.gui.ListSelectorDialog;
import weka.gui.PropertyDialog;

import javax.swing.*;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import javax.swing.event.TableModelEvent;
import java.awt.BorderLayout;
import java.awt.Cursor;
import java.awt.Toolkit;
import java.awt.datatransfer.Clipboard;
import java.awt.datatransfer.StringSelection;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.io.File;
import java.util.*;

/**
 * A Panel representing an ARFF-Table and the associated filename.
 * 
 * 
 * @author FracPete (fracpete at waikato dot ac dot nz)
 * @version $Revision: 14907 $
 */

public class ArffPanel extends JPanel implements ActionListener,
  ChangeListener, MouseListener, Undoable {

  /** for serialization */
  static final long serialVersionUID = -4697041150989513939L;

  /** the name of the tab for instances that were set directly */
  public final static String TAB_INSTANCES = "Instances";

  /** the underlying table */
  private ArffTable m_TableArff;
  /** the popup menu for the header row */
  private JPopupMenu m_PopupHeader;
  /** the popup menu for the data rows */
  private JPopupMenu m_PopupRows;
  /** displays the relation name */
  private JLabel m_LabelName;
  /** whether to display the attribute index in the table header. */
  private boolean m_ShowAttributeIndex;

  // menu items
  private JMenuItem menuItemMean;
  private JMenuItem menuItemSetAllValues;
  private JMenuItem menuItemSetMissingValues;
  private JMenuItem menuItemReplaceValues;
  private JMenuItem menuItemRenameAttribute;
  private JMenuItem menuItemSetAttributeWeight;
  private JMenuItem menuItemAttributeAsClass;
  private JMenuItem menuItemDeleteAttribute;
  private JMenuItem menuItemDeleteAttributes;
  private JMenuItem menuItemSortInstances;
  private JMenuItem menuItemDeleteSelectedInstance;
  private JMenuItem menuItemDeleteAllSelectedInstances;
  private JMenuItem menuItemInsertInstance;
  private JMenuItem menuItemSetInstanceWeight;
  private JMenuItem menuItemSearch;
  private JMenuItem menuItemClearSearch;
  private JMenuItem menuItemUndo;
  private JMenuItem menuItemCopy;
  private JMenuItem menuItemOptimalColWidth;
  private JMenuItem menuItemOptimalColWidths;

  /** the filename used in the title */
  private String m_Filename;
  /** the title prefix */
  private String m_Title;
  /** the currently selected column */
  private int m_CurrentCol;
  /** flag for whether data got changed */
  private boolean m_Changed;
  /** the listeners that listen for modifications */
  private HashSet m_ChangeListeners;
  /** the string used in the last search */
  private String m_LastSearch;
  /** the string used in the last replace */
  private String m_LastReplace;

  /**
   * initializes the panel with no data
   */
  public ArffPanel() {
    super();

    initialize();
    createPanel();
  }

  /**
   * initializes the panel and loads the specified file
   * 
   * @param filename the file to load
   * @param loaders optional varargs loader to use
   */
  public ArffPanel(String filename, AbstractFileLoader... loaders) {
    this();

    loadFile(filename, loaders);
  }

  /**
   * initializes the panel with the given data
   * 
   * @param data the data to use
   */
  public ArffPanel(Instances data) {
    this();

    m_Filename = "";

    setInstances(data);
  }

  /**
   * any member variables are initialized here
   */
  protected void initialize() {
    m_Filename = "";
    m_Title = "";
    m_CurrentCol = -1;
    m_LastSearch = "";
    m_LastReplace = "";
    m_ShowAttributeIndex = true;
    m_Changed = false;
    m_ChangeListeners = new HashSet();
  }

  /**
   * creates all the components in the frame
   */
  protected void createPanel() {
    JScrollPane pane;

    setLayout(new BorderLayout());

    menuItemMean = new JMenuItem("Get mean...");
    menuItemMean.addActionListener(this);
    menuItemSetAllValues = new JMenuItem("Set all values to...");
    menuItemSetAllValues.addActionListener(this);
    menuItemSetMissingValues = new JMenuItem("Set missing values to...");
    menuItemSetMissingValues.addActionListener(this);
    menuItemReplaceValues = new JMenuItem("Replace values with...");
    menuItemReplaceValues.addActionListener(this);
    menuItemRenameAttribute = new JMenuItem("Rename attribute...");
    menuItemRenameAttribute.addActionListener(this);
    menuItemSetAttributeWeight = new JMenuItem("Set attribute weight...");
    menuItemSetAttributeWeight.addActionListener(this);
    menuItemAttributeAsClass = new JMenuItem("Attribute as class");
    menuItemAttributeAsClass.addActionListener(this);
    menuItemDeleteAttribute = new JMenuItem("Delete attribute");
    menuItemDeleteAttribute.addActionListener(this);
    menuItemDeleteAttributes = new JMenuItem("Delete attributes...");
    menuItemDeleteAttributes.addActionListener(this);
    menuItemSortInstances = new JMenuItem("Sort data (ascending)");
    menuItemSortInstances.addActionListener(this);
    menuItemOptimalColWidth = new JMenuItem("Optimal column width (current)");
    menuItemOptimalColWidth.addActionListener(this);
    menuItemOptimalColWidths = new JMenuItem("Optimal column width (all)");
    menuItemOptimalColWidths.addActionListener(this);
    menuItemInsertInstance = new JMenuItem("Insert new instance");
    menuItemSetInstanceWeight = new JMenuItem("Set instance weight");

    // row popup
    menuItemUndo = new JMenuItem("Undo");
    menuItemUndo.addActionListener(this);
    menuItemCopy = new JMenuItem("Copy");
    menuItemCopy.addActionListener(this);
    menuItemSearch = new JMenuItem("Search...");
    menuItemSearch.addActionListener(this);
    menuItemClearSearch = new JMenuItem("Clear search");
    menuItemClearSearch.addActionListener(this);
    menuItemDeleteSelectedInstance = new JMenuItem("Delete selected instance");
    menuItemDeleteSelectedInstance.addActionListener(this);
    menuItemDeleteAllSelectedInstances =
      new JMenuItem("Delete ALL selected instances");
    menuItemDeleteAllSelectedInstances.addActionListener(this);
    menuItemInsertInstance.addActionListener(this);
    menuItemSetInstanceWeight.addActionListener(this);

    // table
    m_TableArff = new ArffTable();
    m_TableArff.setToolTipText("Right click (or left+alt) for context menu");
    m_TableArff.getTableHeader().addMouseListener(this);
    m_TableArff
      .getTableHeader()
      .setToolTipText(
        "Sort view: left click = ascending / Shift + left click = descending
Menu: right click (or left+alt)");
    m_TableArff.getTableHeader()
      .setDefaultRenderer(new ArffTableCellRenderer());
    m_TableArff.addChangeListener(this);
    m_TableArff.addMouseListener(this);
    pane = new JScrollPane(m_TableArff);
    add(pane, BorderLayout.CENTER);

    // relation name
    m_LabelName = new JLabel();
    add(m_LabelName, BorderLayout.NORTH);
  }

  /**
   * initializes the popup menus
   */
  private void initPopupMenus() {
    // header popup
    m_PopupHeader = new JPopupMenu();
    m_PopupHeader.addMouseListener(this);
    m_PopupHeader.add(menuItemMean);
    if (!isReadOnly()) {
      m_PopupHeader.addSeparator();
      m_PopupHeader.add(menuItemSetAllValues);
      m_PopupHeader.add(menuItemSetMissingValues);
      m_PopupHeader.add(menuItemReplaceValues);
      m_PopupHeader.addSeparator();
      m_PopupHeader.add(menuItemRenameAttribute);
      m_PopupHeader.add(menuItemSetAttributeWeight);
      m_PopupHeader.add(menuItemAttributeAsClass);
      m_PopupHeader.add(menuItemDeleteAttribute);
      m_PopupHeader.add(menuItemDeleteAttributes);
      m_PopupHeader.add(menuItemSortInstances);
    }
    m_PopupHeader.addSeparator();
    m_PopupHeader.add(menuItemOptimalColWidth);
    m_PopupHeader.add(menuItemOptimalColWidths);

    // row popup
    m_PopupRows = new JPopupMenu();
    m_PopupRows.addMouseListener(this);
    if (!isReadOnly()) {
      m_PopupRows.add(menuItemUndo);
      m_PopupRows.addSeparator();
    }
    m_PopupRows.add(menuItemCopy);
    m_PopupRows.addSeparator();
    m_PopupRows.add(menuItemSearch);
    m_PopupRows.add(menuItemClearSearch);
    if (!isReadOnly()) {
      m_PopupRows.addSeparator();
      m_PopupRows.add(menuItemDeleteSelectedInstance);
      m_PopupRows.add(menuItemDeleteAllSelectedInstances);
      m_PopupRows.add(menuItemInsertInstance);
      m_PopupRows.add(menuItemSetInstanceWeight);
    }
  }

  /**
   * sets the enabled/disabled state of the menu items
   */
  private void setMenu() {
    boolean isNumeric;
    boolean hasColumns;
    boolean hasRows;
    boolean attSelected;
    ArffSortedTableModel model;
    boolean isNull;

    model = (ArffSortedTableModel) m_TableArff.getModel();
    isNull = (model.getInstances() == null);
    hasColumns = !isNull && (model.getInstances().numAttributes() > 0);
    hasRows = !isNull && (model.getInstances().numInstances() > 0);
    attSelected = hasColumns && model.isAttribute(m_CurrentCol);
    isNumeric = attSelected && (model.getAttributeAt(m_CurrentCol).isNumeric());

    menuItemUndo.setEnabled(canUndo());
    menuItemCopy.setEnabled(true);
    menuItemSearch.setEnabled(true);
    menuItemClearSearch.setEnabled(true);
    menuItemMean.setEnabled(isNumeric);
    menuItemSetAllValues.setEnabled(attSelected);
    menuItemSetMissingValues.setEnabled(attSelected);
    menuItemReplaceValues.setEnabled(attSelected);
    menuItemRenameAttribute.setEnabled(attSelected);
    menuItemSetAttributeWeight.setEnabled(attSelected);
    menuItemDeleteAttribute.setEnabled(attSelected);
    menuItemDeleteAttributes.setEnabled(attSelected);
    menuItemAttributeAsClass.setEnabled(attSelected);
    menuItemSortInstances.setEnabled(hasRows && (attSelected || m_CurrentCol == 1));
    menuItemDeleteSelectedInstance.setEnabled(hasRows
      && m_TableArff.getSelectedRow() > -1);
    menuItemDeleteAllSelectedInstances.setEnabled(hasRows
      && (m_TableArff.getSelectedRows().length > 0));
  }

  /**
   * returns the table component
   * 
   * @return the table
   */
  public ArffTable getTable() {
    return m_TableArff;
  }

  /**
   * returns the title for the Tab, i.e. the filename
   * 
   * @return the title for the tab
   */
  public String getTitle() {
    return m_Title;
  }

  /**
   * returns the filename
   * 
   * @return the filename
   */
  public String getFilename() {
    return m_Filename;
  }

  /**
   * sets the filename
   * 
   * @param filename the new filename
   */
  public void setFilename(String filename) {
    m_Filename = filename;
    createTitle();
  }

  /**
   * returns the instances of the panel, if none then NULL
   * 
   * @return the instances of the panel
   */
  public Instances getInstances() {
    Instances result;

    result = null;

    if (m_TableArff.getModel() != null) {
      result = ((ArffSortedTableModel) m_TableArff.getModel()).getInstances();
    }

    return result;
  }

  /**
   * displays the given instances, i.e. creates a tab with the title
   * TAB_INSTANCES. if one already exists it closes it.

   * if a different instances object is used here, don't forget to clear the
   * undo-history by calling clearUndo()
   * 
   * @param data the instances to display
   * @see #TAB_INSTANCES
   * @see #clearUndo()
   */
  public void setInstances(Instances data) {
    ArffSortedTableModel model;

    m_Filename = TAB_INSTANCES;

    createTitle();
    model = new ArffSortedTableModel(data);
    model.setShowAttributeIndex(m_ShowAttributeIndex);

    m_TableArff.setModel(model);
    clearUndo();
    setChanged(false);
    createName();
  }

  /**
   * returns a list with the attributes
   * 
   * @return a list of the attributes
   */
  public Vector getAttributes() {
    Vector result;
    int i;

    result = new Vector();
    for (i = 0; i < getInstances().numAttributes(); i++) {
      result.add(getInstances().attribute(i).name());
    }
    Collections.sort(result);

    return result;
  }

  /**
   * can only reset the changed state to FALSE
   * 
   * @param changed if false, resets the changed state
   */
  public void setChanged(boolean changed) {
    if (!changed) {
      this.m_Changed = changed;
      createTitle();
    }
  }

  /**
   * returns whether the content of the panel was changed
   * 
   * @return true if the content was changed
   */
  public boolean isChanged() {
    return m_Changed;
  }

  /**
   * returns whether the model is read-only
   * 
   * @return true if model is read-only
   */
  public boolean isReadOnly() {
    if (m_TableArff == null) {
      return true;
    } else {
      return ((ArffSortedTableModel) m_TableArff.getModel()).isReadOnly();
    }
  }

  /**
   * sets whether the model is read-only
   * 
   * @param value if true the model is set to read-only
   */
  public void setReadOnly(boolean value) {
    if (m_TableArff != null) {
      ((ArffSortedTableModel) m_TableArff.getModel()).setReadOnly(value);
    }
  }

  /**
   * Sets whether to display the attribute index in the header.
   * 
   * @param value if true then the attribute indices are displayed in the table
   *          header
   */
  public void setShowAttributeIndex(boolean value) {
    m_ShowAttributeIndex = value;
    if (m_TableArff != null) {
      ((ArffSortedTableModel) m_TableArff.getModel())
        .setShowAttributeIndex(value);
    }
  }

  /**
   * Returns whether to display the attribute index in the header.
   * 
   * @return true if the attribute indices are displayed in the table header
   */
  public boolean getShowAttributeIndex() {
    return m_ShowAttributeIndex;
  }

  /**
   * returns whether undo support is enabled
   * 
   * @return true if undo is enabled
   */
  @Override
  public boolean isUndoEnabled() {
    return ((ArffSortedTableModel) m_TableArff.getModel()).isUndoEnabled();
  }

  /**
   * sets whether undo support is enabled
   * 
   * @param enabled whether to enable/disable undo support
   */
  @Override
  public void setUndoEnabled(boolean enabled) {
    ((ArffSortedTableModel) m_TableArff.getModel()).setUndoEnabled(enabled);
  }

  /**
   * removes the undo history
   */
  @Override
  public void clearUndo() {
    ((ArffSortedTableModel) m_TableArff.getModel()).clearUndo();
  }

  /**
   * returns whether an undo is possible
   * 
   * @return true if undo is possible
   */
  @Override
  public boolean canUndo() {
    return ((ArffSortedTableModel) m_TableArff.getModel()).canUndo();
  }

  /**
   * performs an undo action
   */
  @Override
  public void undo() {
    if (canUndo()) {
      ((ArffSortedTableModel) m_TableArff.getModel()).undo();

      // notify about update
      notifyListener();
    }
  }

  /**
   * adds the current state of the instances to the undolist
   */
  @Override
  public void addUndoPoint() {
    ((ArffSortedTableModel) m_TableArff.getModel()).addUndoPoint();

    // update menu
    setMenu();
  }

  /**
   * sets the title (i.e. filename)
   */
  private void createTitle() {
    File file;

    if (m_Filename.equals("")) {
      m_Title = "-none-";
    } else if (m_Filename.equals(TAB_INSTANCES)) {
      m_Title = TAB_INSTANCES;
    } else {
      try {
        file = new File(m_Filename);
        m_Title = file.getName();
      } catch (Exception e) {
        m_Title = "-none-";
      }
    }

    if (isChanged()) {
      m_Title += " *";
    }
  }

  /**
   * sets the relation name
   */
  private void createName() {
    ArffSortedTableModel model;

    model = (ArffSortedTableModel) m_TableArff.getModel();
    if ((model != null) && (model.getInstances() != null)) {
      m_LabelName.setText("Relation: " + model.getInstances().relationName());
    } else {
      m_LabelName.setText("");
    }
  }

  /**
   * loads the specified file into the table
   * 
   * @param filename the file to load
   * @param loaders optional varargs loader to use
   */
  private void loadFile(String filename, AbstractFileLoader... loaders) {
    ArffSortedTableModel model;

    this.m_Filename = filename;

    createTitle();

    if (filename.equals("")) {
      model = null;
    } else {
      model = new ArffSortedTableModel(filename, loaders);
      model.setShowAttributeIndex(getShowAttributeIndex());
    }

    m_TableArff.setModel(model);
    setChanged(false);
    createName();
  }

  /**
   * calculates the mean of the given numeric column
   */
  private void calcMean() {
    ArffSortedTableModel model;
    int i;
    double mean;

    // no column selected?
    if (m_CurrentCol == -1) {
      return;
    }

    model = (ArffSortedTableModel) m_TableArff.getModel();

    // not numeric?
    if (!model.getAttributeAt(m_CurrentCol).isNumeric()) {
      return;
    }

    mean = 0;
    for (i = 0; i < model.getRowCount(); i++) {
      mean += model.getInstances().instance(i).value(model.getAttributeIndex(m_CurrentCol));
    }
    mean = mean / model.getRowCount();

    // show result
    ComponentHelper.showMessageBox(getParent(), "Mean for attribute...",
      "Mean for attribute '" + m_TableArff.getPlainColumnName(m_CurrentCol)
        + "':\n\t" + Utils.doubleToString(mean, 3),
      JOptionPane.OK_CANCEL_OPTION, JOptionPane.PLAIN_MESSAGE);
  }

  /**
   * sets the specified values in a column to a new value
   * 
   * @param o the menu item
   */
  private void setValues(Object o) {
    String msg;
    String title;
    String value;
    String valueNew;
    int i;
    ArffSortedTableModel model;

    value = "";
    valueNew = "";

    if (o == menuItemSetMissingValues) {
      title = "Replace missing values...";
      msg = "New value for MISSING values";
    } else if (o == menuItemSetAllValues) {
      title = "Set all values...";
      msg = "New value for ALL values";
    } else if (o == menuItemReplaceValues) {
      title = "Replace values...";
      msg = "Old value";
    } else {
      return;
    }

    value =
      ComponentHelper.showInputBox(m_TableArff.getParent(), title, msg,
        m_LastSearch);

    // cancelled?
    if (value == null) {
      return;
    }

    m_LastSearch = value;

    // replacement
    if (o == menuItemReplaceValues) {
      valueNew =
        ComponentHelper.showInputBox(m_TableArff.getParent(), title,
          "New value", m_LastReplace);
      if (valueNew == null) {
        return;
      }
      m_LastReplace = valueNew;
    }

    model = (ArffSortedTableModel) m_TableArff.getModel();
    model.setNotificationEnabled(false);

    // undo
    addUndoPoint();
    model.setUndoEnabled(false);
    String valueCopy = value;
    String valueNewCopy = valueNew;
    // set value
    for (i = 0; i < m_TableArff.getRowCount(); i++) {
      if (o == menuItemSetAllValues) {
        if (valueCopy.equals("NaN") || valueCopy.equals("?")) {
          value = null;
        }
        model.setValueAt(value, i, m_CurrentCol);
      } else if ((o == menuItemSetMissingValues)
        && model.isMissingAt(i, m_CurrentCol)) {
        model.setValueAt(value, i, m_CurrentCol);
      } else if ((o == menuItemReplaceValues)
        && model.getValueAt(i, m_CurrentCol) != null
        && model.getValueAt(i, m_CurrentCol).toString().equals(value)) {
        if (valueNewCopy.equals("NaN") || valueNewCopy.equals("?")) {
          valueNew = null;
        }
        model.setValueAt(valueNew, i, m_CurrentCol);
      }

    }
    model.setUndoEnabled(true);
    model.setNotificationEnabled(true);
    model.notifyListener(new TableModelEvent(model, 0, model.getRowCount(),
      m_CurrentCol, TableModelEvent.UPDATE));

    // refresh
    m_TableArff.repaint();
  }

  /**
   * deletes the currently selected attribute
   */
  public void deleteAttribute() {
    ArffSortedTableModel model;

    // no column selected?
    if (m_CurrentCol == -1) {
      return;
    }

    model = (ArffSortedTableModel) m_TableArff.getModel();

    // We cannot remove the class attribute
    if (model.getInstances().classIndex() == model.getAttributeIndex(m_CurrentCol)) {
      ComponentHelper.showMessageBox(getParent(), "Warning",
              "Class attribute cannot be removed and will be skipped.", -1, JOptionPane.INFORMATION_MESSAGE);
      return;
    }

    // really an attribute column?
    if (model.getAttributeAt(m_CurrentCol) == null) {
      return;
    }

    // really?
    if (ComponentHelper.showMessageBox(
      getParent(),
      "Confirm...",
      "Do you really want to delete the attribute '"
        + model.getAttributeAt(m_CurrentCol).name() + "'?",
      JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE) != JOptionPane.YES_OPTION) {
      return;
    }

    setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
    model.deleteAttributeAt(m_CurrentCol);
    setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
  }

  /**
   * deletes the chosen attributes
   */
  public void deleteAttributes() {
    ListSelectorDialog dialog;
    ArffSortedTableModel model;
    Object[] atts;
    JList list;
    int result;

    list = new JList(getAttributes());

    dialog = new ListSelectorDialog(SwingUtilities.getWindowAncestor(this), list);
    result = dialog.showDialog();

    if (result != ListSelectorDialog.APPROVE_OPTION) {
      return;
    }

    atts = list.getSelectedValues();

    // really?
    if (ComponentHelper.showMessageBox(getParent(), "Confirm...",
      "Do you really want to delete these " + atts.length + " attributes?",
      JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE) != JOptionPane.YES_OPTION) {
      return;
    }

    model = (ArffSortedTableModel) m_TableArff.getModel();
    ArrayList al = new ArrayList<>(atts.length);
    for (int i = 0; i < atts.length; i++) {
      int index = model.getAttributeColumn(atts[i].toString());

      // We cannot remove the class attribute
      if (model.isClassIndex(index)) {
        ComponentHelper.showMessageBox(getParent(), "Warning",
                "Class attribute cannot be removed and will be skipped.", -1, JOptionPane.INFORMATION_MESSAGE);
      } else {
        al.add(index);
      }
    }

    int[] indices = new int[al.size()];
    for (int i = 0; i < al.size(); i++) {
      indices[i] = al.get(i);
    }

    setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
    model.deleteAttributes(indices);
    setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
  }

  /**
   * sets the current attribute as class attribute, i.e. it moves it to the end
   * of the attributes
   */
  public void attributeAsClass() {
    ArffSortedTableModel model;

    // no column selected?
    if (m_CurrentCol == -1) {
      return;
    }

    model = (ArffSortedTableModel) m_TableArff.getModel();

    // really an attribute column?
    if (model.getAttributeAt(m_CurrentCol) == null) {
      return;
    }

    setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
    model.attributeAsClassAt(m_CurrentCol);
    setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
  }

  /**
   * renames the current attribute
   */
  public void renameAttribute() {
    ArffSortedTableModel model;
    String newName;

    // no column selected?
    if (m_CurrentCol == -1) {
      return;
    }

    model = (ArffSortedTableModel) m_TableArff.getModel();

    // really an attribute column?
    if (model.getAttributeAt(m_CurrentCol) == null) {
      return;
    }

    newName =
      ComponentHelper.showInputBox(getParent(), "Rename attribute...",
        "Enter new Attribute name", model.getAttributeAt(m_CurrentCol).name());
    if (newName == null) {
      return;
    }

    setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
    model.renameAttributeAt(m_CurrentCol, newName);
    setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
  }

  /**
   * sets the weight for the current attribute
   */
  public void setAttributeWeight() {
    ArffSortedTableModel model;
    double newWeight = Double.NaN;

    // no column selected?
    if (m_CurrentCol == -1) {
      return;
    }

    model = (ArffSortedTableModel) m_TableArff.getModel();

    // really an attribute column?
    if (model.getAttributeAt(m_CurrentCol) == null) {
      return;
    }

    try {
      newWeight = Double.parseDouble(ComponentHelper.showInputBox(getParent(), "Set attribute weight...",
                      "Enter a new weight for the attribute", model.getAttributeAt(m_CurrentCol).weight()));
    } catch (Exception ex) {
      // Silently ignore
    }
    if (Double.isNaN(newWeight)) {
      return;
    }

    setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
    model.setAttributeWeightAt(m_CurrentCol, newWeight);
    setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
  }
  /**
   * deletes the currently selected instance
   */
  public void deleteInstance() {
    int index;

    index = m_TableArff.getSelectedRow();
    if (index == -1) {
      return;
    }

    ((ArffSortedTableModel) m_TableArff.getModel()).deleteInstanceAt(index);
  }

  /**
   * Add an instance at the currently selected index. If no instance is selected
   * then adds a new instance at the end of the dataset.
   */
  public void addInstance() {
    int index = m_TableArff.getSelectedRow();
    ((ArffSortedTableModel) m_TableArff.getModel()).insertInstance(index);
  }

  /**
   * Allows setting the weight of the instance at the selected row.
   */
  public void setInstanceWeight() {
    int index = m_TableArff.getSelectedRow();
    if (index == -1) {
      return;
    }
    String newWeight =
            ComponentHelper.showInputBox(getParent(), "Set instance weight...",
                    "Enter new instance weight",
                    ((ArffSortedTableModel) m_TableArff.getModel()).getInstances().instance(index).weight());
    if (newWeight == null) {
      return;
    }
    double weight = 1.0;
    try {
      weight = Double.parseDouble(newWeight);
    } catch (Exception ex) {
      return;
    }
    ((ArffSortedTableModel) m_TableArff.getModel()).setInstanceWeight(index, weight);
  }

  /**
   * Add an instance at the end of the dataset
   */
  public void addInstanceAtEnd() {
    ((ArffSortedTableModel) m_TableArff.getModel()).insertInstance(-1);
  }

  /**
   * deletes all the currently selected instances
   */
  public void deleteInstances() {
    int[] indices;

    if (m_TableArff.getSelectedRow() == -1) {
      return;
    }

    indices = m_TableArff.getSelectedRows();
    ((ArffSortedTableModel) m_TableArff.getModel()).deleteInstances(indices);
  }

  /**
   * sorts the instances via the currently selected column
   */
  public void sortInstances() {
    if (m_CurrentCol == -1) {
      return;
    }

    ((ArffSortedTableModel) m_TableArff.getModel()).sortInstances(m_CurrentCol);
  }

  /**
   * copies the content of the selection to the clipboard
   */
  public void copyContent() {
    StringSelection selection;
    Clipboard clipboard;

    selection = getTable().getStringSelection();
    if (selection == null) {
      return;
    }

    clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
    clipboard.setContents(selection, selection);
  }

  /**
   * searches for a string in the cells
   */
  public void search() {
    String searchString;

    // display dialog
    searchString =
      ComponentHelper.showInputBox(getParent(), "Search...",
        "Enter the string to search for", m_LastSearch);
    if (searchString != null) {
      m_LastSearch = searchString;
    }

    getTable().setSearchString(searchString);
  }

  /**
   * clears the search, i.e. resets the found cells
   */
  public void clearSearch() {
    getTable().setSearchString("");
  }

  /**
   * calculates the optimal column width for the current column
   */
  public void setOptimalColWidth() {
    // no column selected?
    if (m_CurrentCol == -1) {
      return;
    }

    JTableHelper.setOptimalColumnWidth(getTable(), m_CurrentCol);
  }

  /**
   * calculates the optimal column widths for all columns
   */
  public void setOptimalColWidths() {
    JTableHelper.setOptimalColumnWidth(getTable());
  }

  /**
   * invoked when an action occurs
   * 
   * @param e the action event
   */
  @Override
  public void actionPerformed(ActionEvent e) {
    Object o;

    o = e.getSource();

    if (o == menuItemMean) {
      calcMean();
    } else if (o == menuItemSetAllValues) {
      setValues(menuItemSetAllValues);
    } else if (o == menuItemSetMissingValues) {
      setValues(menuItemSetMissingValues);
    } else if (o == menuItemReplaceValues) {
      setValues(menuItemReplaceValues);
    } else if (o == menuItemRenameAttribute) {
      renameAttribute();
    } else if (o == menuItemSetAttributeWeight) {
      setAttributeWeight();
    } else if (o == menuItemAttributeAsClass) {
      attributeAsClass();
    } else if (o == menuItemSortInstances) {
      sortInstances();
    } else if (o == menuItemDeleteAttribute) {
      deleteAttribute();
    } else if (o == menuItemDeleteAttributes) {
      deleteAttributes();
    } else if (o == menuItemDeleteSelectedInstance) {
      deleteInstance();
    } else if (o == menuItemDeleteAllSelectedInstances) {
      deleteInstances();
    } else if (o == menuItemInsertInstance) {
      addInstance();
    } else if (o == menuItemSetInstanceWeight) {
      setInstanceWeight();
    } else if (o == menuItemSearch) {
      search();
    } else if (o == menuItemClearSearch) {
      clearSearch();
    } else if (o == menuItemUndo) {
      undo();
    } else if (o == menuItemCopy) {
      copyContent();
    } else if (o == menuItemOptimalColWidth) {
      setOptimalColWidth();
    } else if (o == menuItemOptimalColWidths) {
      setOptimalColWidths();
    }
  }

  /**
   * Invoked when a mouse button has been pressed and released on a component
   * 
   * @param e the mouse event
   */
  @Override
  public void mouseClicked(MouseEvent e) {
    int col;
    boolean popup;

    col = m_TableArff.columnAtPoint(e.getPoint());
    popup =
      ((e.getButton() == MouseEvent.BUTTON3) && (e.getClickCount() == 1))
        || ((e.getButton() == MouseEvent.BUTTON1) && (e.getClickCount() == 1)
          && e.isAltDown() && !e.isControlDown() && !e.isShiftDown());
    popup = popup && (getInstances() != null);

    if (e.getSource() == m_TableArff.getTableHeader()) {
      m_CurrentCol = col;

      // Popup-Menu
      if (popup) {
        e.consume();
        setMenu();
        initPopupMenus();
        m_PopupHeader.show(e.getComponent(), e.getX(), e.getY());
      }
    } else if (e.getSource() == m_TableArff) {
      // Popup-Menu
      if (popup) {
        e.consume();
        setMenu();
        initPopupMenus();
        m_PopupRows.show(e.getComponent(), e.getX(), e.getY());
      }
    }

    // highlihgt column
    if ((e.getButton() == MouseEvent.BUTTON1) && (e.getClickCount() == 1)
      && (!e.isAltDown()) && (col > -1)) {
      m_TableArff.setSelectedColumn(col);
    }
  }

  /**
   * Invoked when the mouse enters a component.
   * 
   * @param e the mouse event
   */
  @Override
  public void mouseEntered(MouseEvent e) {
  }

  /**
   * Invoked when the mouse exits a component
   * 
   * @param e the mouse event
   */
  @Override
  public void mouseExited(MouseEvent e) {
  }

  /**
   * Invoked when a mouse button has been pressed on a component
   * 
   * @param e the mouse event
   */
  @Override
  public void mousePressed(MouseEvent e) {
  }

  /**
   * Invoked when a mouse button has been released on a component.
   * 
   * @param e the mouse event
   */
  @Override
  public void mouseReleased(MouseEvent e) {
  }

  /**
   * Invoked when the target of the listener has changed its state.
   * 
   * @param e the change event
   */
  @Override
  public void stateChanged(ChangeEvent e) {
    m_Changed = true;
    createTitle();
    notifyListener();
  }

  /**
   * notfies all listener of the change
   */
  public void notifyListener() {
    Iterator iter;

    iter = m_ChangeListeners.iterator();
    while (iter.hasNext()) {
      iter.next().stateChanged(new ChangeEvent(this));
    }
  }

  /**
   * Adds a ChangeListener to the panel
   * 
   * @param l the listener to add
   */
  public void addChangeListener(ChangeListener l) {
    m_ChangeListeners.add(l);
  }

  /**
   * Removes a ChangeListener from the panel
   * 
   * @param l the listener to remove
   */
  public void removeChangeListener(ChangeListener l) {
    m_ChangeListeners.remove(l);
  }
}