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.
   */
  
  /*
   *    AttributeListPanel.java
   *    Copyright (C) 2002 University of Waikato, Hamilton, New Zealand
   *
   */
  
  package weka.gui;
  
  import weka.core.Instances;
  
  import java.awt.BorderLayout;
  import java.awt.Dimension;
  
  import javax.swing.JPanel;
  import javax.swing.JScrollPane;
  import javax.swing.JTable;
  import javax.swing.ListSelectionModel;
  import javax.swing.table.AbstractTableModel;
  import javax.swing.table.TableColumnModel;
  
  /**
   * Creates a panel that displays the attributes contained in a set of
   * instances, letting the user select a single attribute for inspection.
   *
   * @author Richard Kirkby (rkirkby@cs.waikato.ac.nz)
   * @author Len Trigg (trigg@cs.waikato.ac.nz)
   * @version $Revision: 1.3 $
   */
  public class AttributeListPanel
    extends JPanel {
  
    /** for serialization */
    private static final long serialVersionUID = -2030706987910400362L;
  
    /**
     * A table model that looks at the names of attributes.
     */
    class AttributeTableModel
      extends AbstractTableModel {
  
      /** for serialization */
      private static final long serialVersionUID = -7345701953670327707L;
  
      /** The instances who's attribute structure we are reporting */
      protected Instances m_Instances;
      
      /**
       * Creates the tablemodel with the given set of instances.
       *
       * @param instances the initial set of Instances
       */
      public AttributeTableModel(Instances instances) {
  
        setInstances(instances);
      }
  
      /**
       * Sets the tablemodel to look at a new set of instances.
       *
       * @param instances the new set of Instances.
       */
      public void setInstances(Instances instances) {
  
        m_Instances = instances;
      }
      
      /**
       * Gets the number of attributes.
       *
       * @return the number of attributes.
       */
      public int getRowCount() {
        
        return m_Instances.numAttributes();
      }
      
      /**
       * Gets the number of columns: 2
       *
       * @return 2
       */
      public int getColumnCount() {
        
        return 2;
      }
      
      /**
       * Gets a table cell
       *
       * @param row the row index
       * @param column the column index
       * @return the value at row, column
       */
      public Object getValueAt(int row, int column) {
        
        switch (column) {
        case 0:
  	return new Integer(row + 1);
        case 1:
  	return m_Instances.attribute(row).name();
        default:
  	return null;
        }
      }
      
      /**
       * Gets the name for a column.
       *
       * @param column the column index.
       * @return the name of the column.
       */
      public String getColumnName(int column) {
        
        switch (column) {
        case 0:
  	return new String("No.");
        case 1:
  	return new String("Name");
        default:
  	return null;
        }
      }
      
      /**
       * Gets the class of elements in a column.
       *
       * @param col the column index.
       * @return the class of elements in the column.
       */
      public Class getColumnClass(int col) {
        return getValueAt(0, col).getClass();
      }
  
      /**
       * Returns false
       *
       * @param row ignored
       * @param col ignored
       * @return false
       */
      public boolean isCellEditable(int row, int col) {
  
        return false;
      }
    }
  
    /** The table displaying attribute names */
    protected JTable m_Table = new JTable();
  
    /** The table model containing attribute names */
    protected AttributeTableModel m_Model;
    
    /**
     * Creates the attribute selection panel with no initial instances.
     */
    public AttributeListPanel() {
  
      m_Table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
      m_Table.setColumnSelectionAllowed(false); 
      m_Table.setPreferredScrollableViewportSize(new Dimension(250, 150));
  
      setLayout(new BorderLayout());
      add(new JScrollPane(m_Table), BorderLayout.CENTER);
    }
  
    /**
     * Sets the instances who's attribute names will be displayed.
     *
     * @param newInstances the new set of instances
     */
    public void setInstances(Instances newInstances) {
  
      if (m_Model == null) {
        m_Model = new AttributeTableModel(newInstances);
        m_Table.setModel(m_Model);
        TableColumnModel tcm = m_Table.getColumnModel();
        tcm.getColumn(0).setMaxWidth(60);
        tcm.getColumn(1).setMinWidth(100);
      } else {
        m_Model.setInstances(newInstances);
      }
      m_Table.sizeColumnsToFit(-1);
      m_Table.revalidate();
      m_Table.repaint();
    }
    
    /**
     * Gets the selection model used by the table.
     *
     * @return a value of type 'ListSelectionModel'
     */
    public ListSelectionModel getSelectionModel() {
  
      return m_Table.getSelectionModel();
    }
    
    /**
     * Tests the attribute list panel from the command line.
     *
     * @param args must contain the name of an arff file to load.
     */
    public static void main(String[] args) {
  
      try {
        if (args.length == 0) {
  	throw new Exception("supply the name of an arff file");
        }
        Instances i = new Instances(new java.io.BufferedReader(
  				  new java.io.FileReader(args[0])));
        AttributeListPanel asp = new AttributeListPanel();
        final javax.swing.JFrame jf =
  	new javax.swing.JFrame("Attribute List Panel");
        jf.getContentPane().setLayout(new BorderLayout());
        jf.getContentPane().add(asp, BorderLayout.CENTER);
        jf.addWindowListener(new java.awt.event.WindowAdapter() {
  	public void windowClosing(java.awt.event.WindowEvent e) {
  	  jf.dispose();
  	  System.exit(0);
  	}
        });
        jf.pack();
        jf.setVisible(true);
        asp.setInstances(i);
      } catch (Exception ex) {
        ex.printStackTrace();
        System.err.println(ex.getMessage());
      }
    }
    
  } // AttributeListPanel
  