content: /*
   *    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 2 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, write to the Free Software
   *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
   */
  
  /*
   *    ClassValuePickerCustomizer.java
   *    Copyright (C) 2004 University of Waikato, Hamilton, New Zealand
   *
   */
  
  package weka.gui.beans;
  
  import weka.core.Instances;
  
  import java.awt.BorderLayout;
  import java.awt.GridLayout;
  import java.awt.Window;
  import java.awt.event.ActionEvent;
  import java.awt.event.ActionListener;
  import java.beans.Customizer;
  import java.beans.PropertyChangeListener;
  import java.beans.PropertyChangeSupport;
  
  import javax.swing.BorderFactory;
  import javax.swing.DefaultComboBoxModel;
  import javax.swing.JButton;
  import javax.swing.JComboBox;
  import javax.swing.JLabel;
  import javax.swing.JPanel;
  import javax.swing.JTextField;
  import javax.swing.SwingConstants;
  
  /**
   * @author Mark Hall
   * @version $Revision: 7440 $
   */
  public class ClassValuePickerCustomizer
    extends JPanel
    implements BeanCustomizer, CustomizerClosingListener, 
    CustomizerCloseRequester /*, DataFormatListener*/ {
  
    /** for serialization */
    private static final long serialVersionUID = 8213423053861600469L;
  
    private boolean m_displayValNames = false;
  
    private ClassValuePicker m_classValuePicker;
    
    private PropertyChangeSupport m_pcSupport = 
      new PropertyChangeSupport(this);
  
    private JComboBox m_ClassValueCombo = new JComboBox();
    private JPanel m_holderP = new JPanel();
  
    private JLabel m_messageLabel = new JLabel("No customization possible at present.");
    
    private ModifyListener m_modifyListener;
    private boolean m_modified = false;
    
    private Window m_parent;
    private String m_backup;
    
    private boolean m_textBoxEntryMode = false;
    
    private JTextField m_valueTextBox;
  
    public ClassValuePickerCustomizer() {
      setBorder(javax.swing.BorderFactory.createEmptyBorder(0, 5, 5, 5));
      
      setLayout(new BorderLayout());
      add(new javax.swing.JLabel("ClassValuePickerCustomizer"), 
  	BorderLayout.NORTH);
      m_holderP.setLayout(new BorderLayout());
      m_holderP.setBorder(BorderFactory.createTitledBorder("Choose class value"));
      m_holderP.add(m_ClassValueCombo, BorderLayout.CENTER);
      m_ClassValueCombo.addActionListener(new ActionListener() {
  	public void actionPerformed(ActionEvent e) {
  	  if (m_classValuePicker != null) {
  	    m_classValuePicker.
  	      setClassValue(m_ClassValueCombo.getSelectedItem().toString());
  	    m_modified = true;
  	  }
  	}
        });
  
      add(m_messageLabel, BorderLayout.CENTER);
      addButtons();
    }
    
    private void addButtons() {
      JButton okBut = new JButton("OK");
      JButton cancelBut = new JButton("Cancel");
      
      JPanel butHolder = new JPanel();
      butHolder.setLayout(new GridLayout(1, 2));
      butHolder.add(okBut); butHolder.add(cancelBut);
      add(butHolder, BorderLayout.SOUTH);
      
      okBut.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {        
          if (m_modifyListener != null) {
            m_modifyListener.setModifiedStatus(ClassValuePickerCustomizer.this, m_modified);
          }
          
          if (m_textBoxEntryMode) {
            m_classValuePicker.setClassValue(m_valueTextBox.getText().trim());
          }
          
          if (m_parent != null) {
            m_parent.dispose();
          }
        }
      });
      
      cancelBut.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
          m_classValuePicker.setClassValue(m_backup);
          
          customizerClosing();
          if (m_parent != null) {
            m_parent.dispose();
          }
        }
      });
    }
    
    private void setupTextBoxSelection() {
      m_textBoxEntryMode = true;
      
      JPanel holderPanel = new JPanel();
      holderPanel.setLayout(new BorderLayout());
      holderPanel.setBorder(BorderFactory.createTitledBorder("Specify class label"));
      JLabel label = new JLabel("Class label ", SwingConstants.RIGHT);
      holderPanel.add(label, BorderLayout.WEST);
      m_valueTextBox = new JTextField(15);
      m_valueTextBox.setToolTipText("Class label. /first, /last and /<num> " +
      		"can be used to specify the first, last or specific index " +
      		"of the label to use respectively.");
  
      holderPanel.add(m_valueTextBox, BorderLayout.CENTER);
      JPanel holder2 = new JPanel();
      holder2.setLayout(new BorderLayout());
      holder2.add(holderPanel, BorderLayout.NORTH);
      add(holder2, BorderLayout.CENTER);
      String existingClassVal = m_classValuePicker.getClassValue();
      if (existingClassVal != null) {
        m_valueTextBox.setText(existingClassVal);
      }
    }
  
    private void setUpValueSelection(Instances format) {
      if (format.classIndex() < 0 || format.classAttribute().isNumeric()) {
        // cant do anything in this case
        m_messageLabel.setText((format.classIndex() < 0) ?
            "EROR: no class attribute set" : "ERROR: class is numeric");
        return;
      }
      
      if (m_displayValNames == false) {
        remove(m_messageLabel);
      }
      
      m_textBoxEntryMode = false;
      
      if (format.classAttribute().numValues() == 0) {
        // loader may not be able to give us the set of legal
        // values for a nominal attribute until it has read
        // the data (e.g. database loader or csv loader).
        // In this case we'll use a text box and the user
        // can enter the class value.
        setupTextBoxSelection();
        validate(); repaint();
        return;
      }    
      
      String existingClassVal = m_classValuePicker.getClassValue();
      if (existingClassVal == null) {
        existingClassVal = "";
      }
      int classValIndex = format.classAttribute().indexOfValue(existingClassVal);
      
      // do we have a special (last, first or number)
      if (existingClassVal.startsWith("/")) {
        existingClassVal = existingClassVal.substring(1);
        if (existingClassVal.equalsIgnoreCase("first")) {
          classValIndex = 0;
        } else if (existingClassVal.equalsIgnoreCase("last")) {
          classValIndex = format.classAttribute().numValues() - 1;
        } else {
          // try and parse as a number
          classValIndex = Integer.parseInt(existingClassVal);
          classValIndex--;
        }
      }
      
      if (classValIndex < 0) {
        classValIndex = 0;
      }
      String [] attribValNames = new String [format.classAttribute().numValues()];
      for (int i = 0; i < attribValNames.length; i++) {
        attribValNames[i] = format.classAttribute().value(i);
      }
      m_ClassValueCombo.setModel(new DefaultComboBoxModel(attribValNames));
      if (attribValNames.length > 0) {
  //      if (existingClassVal < attribValNames.length) {
        m_ClassValueCombo.setSelectedIndex(classValIndex);
  //      }
      }
      if (m_displayValNames == false) {
        add(m_holderP, BorderLayout.CENTER);
        m_displayValNames = true;
      }
      validate(); repaint();
    }
  
    /**
     * Set the bean to be edited
     *
     * @param object an <code>Object</code> value
     */
    public void setObject(Object object) {
      if (m_classValuePicker != (ClassValuePicker)object) {
        // remove ourselves as a listener from the old ClassvaluePicker (if necessary)
  /*      if (m_classValuePicker != null) {
  	m_classValuePicker.removeDataFormatListener(this);
        } */
        m_classValuePicker = (ClassValuePicker)object;
        // add ourselves as a data format listener
  //      m_classValuePicker.addDataFormatListener(this);
        if (m_classValuePicker.getConnectedFormat() != null) {
  	setUpValueSelection(m_classValuePicker.getConnectedFormat());	
        } 
        m_backup = m_classValuePicker.getClassValue();
      }
    }
    
    public void customizerClosing() {
      // remove ourselves as a listener from the ClassValuePicker (if necessary)
    //  if (m_classValuePicker != null) {
  //      System.out.println("Customizer deregistering with class value picker");
  //      m_classValuePicker.removeDataFormatListener(this);
      //}    
      m_classValuePicker.setClassValue(m_backup);
    }
  
  /*  public void newDataFormat(DataSetEvent dse) {
      if (dse.getDataSet() != null) {
        setUpValueSelection(m_classValuePicker.getConnectedFormat());
      } else {
        setUpNoCustPossible();
      }
    } */
    
    /**
     * Add a property change listener
     *
     * @param pcl a <code>PropertyChangeListener</code> value
     */
    public void addPropertyChangeListener(PropertyChangeListener pcl) {
      m_pcSupport.addPropertyChangeListener(pcl);
    }
    
    /**
     * Remove a property change listener
     *
     * @param pcl a <code>PropertyChangeListener</code> value
     */
    public void removePropertyChangeListener(PropertyChangeListener pcl) {
      m_pcSupport.removePropertyChangeListener(pcl);
    }
  
    @Override
    public void setModifiedListener(ModifyListener l) {
      m_modifyListener = l;
    }
    
    @Override
    public void setParentWindow(Window parent) {
      m_parent = parent;
    }
  }
  