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.
   */
  
  /*
   *    InstanceViewer.java
   *    Copyright (C) 1999 University of Waikato, Hamilton, New Zealand
   *
   */
  
  package weka.gui.streams;
  
  import weka.core.Instance;
  import weka.core.Instances;
  
  import java.awt.BorderLayout;
  
  import javax.swing.JPanel;
  import javax.swing.JScrollPane;
  import javax.swing.JTextArea;
  
  /**
   * This is a very simple instance viewer - just displays the dataset as
   * text output as it would be written to a file. A more complex viewer
   * might be more spreadsheet-like
   *
   * @author Len Trigg (trigg@cs.waikato.ac.nz)
   * @version $Revision: 1.5 $
   */
  public class InstanceViewer
    extends JPanel
    implements InstanceListener {
  
    /** for serialization */
    private static final long serialVersionUID = -4925729441294121772L;
    
    private JTextArea m_OutputTex;
    private boolean m_Debug;
    private boolean m_Clear;
    private String m_UpdateString;
  
    private void updateOutput() {
      
      m_OutputTex.append(m_UpdateString);
      m_UpdateString = "";
    }
  
    private void clearOutput() {
      
      m_UpdateString = "";
      m_OutputTex.setText("");
    }
  
    public void inputFormat(Instances instanceInfo) {
      
      if (m_Debug) {
        System.err.println("InstanceViewer::inputFormat()\n"
  			 + instanceInfo.toString());
      }
      if (m_Clear) {
        clearOutput();
      }
      m_UpdateString += instanceInfo.toString();
      updateOutput();
    }
  
    public void input(Instance instance) throws Exception {
      
      if (m_Debug) {
        System.err.println("InstanceViewer::input(" + instance +")");
      }
      m_UpdateString += instance.toString() + "\n";
      updateOutput();
    }
    
    public void batchFinished() {
      
      updateOutput();
      if (m_Debug) {
        System.err.println("InstanceViewer::batchFinished()");
      }
    }
  
    public InstanceViewer() {
      
      setLayout(new BorderLayout());
      m_UpdateString = "";
      setClearEachDataset(true);
      m_OutputTex = new JTextArea(10,20);
      m_OutputTex.setEditable(false);
      add("Center", new JScrollPane(m_OutputTex));
    }
  
    public void setClearEachDataset(boolean clear) {
      
      m_Clear = clear;
    }
    
    public boolean getClearEachDataset() {
      
      return m_Clear;
    }
    
    public void setDebug(boolean debug) {
      
      m_Debug = debug;
    }
    
    public boolean getDebug() {
      
      return m_Debug;
    }
  
    public void instanceProduced(InstanceEvent e) {
      
      Object source = e.getSource();
      if (source instanceof InstanceProducer) { 
        try {
  	InstanceProducer a = (InstanceProducer) source;
  	switch (e.getID()) {
  	case InstanceEvent.FORMAT_AVAILABLE:
  	  inputFormat(a.outputFormat());
  	  break;
  	case InstanceEvent.INSTANCE_AVAILABLE:
  	  input(a.outputPeek());
  	  break;
  	case InstanceEvent.BATCH_FINISHED:
  	  batchFinished();
  	  break;
  	default:
  	  System.err.println("InstanceViewer::instanceProduced()"
  			     + " - unknown event type");
  	  break;
  	}
        } catch (Exception ex) {
  	System.err.println(ex.getMessage());
        }
      } else {
        System.err.println("InstanceViewer::instanceProduced()"
  			 + " - Unknown source object type");
      }
    }
  }
  