messageviewer.java

一个很好的LIBSVM的JAVA源码。对于要研究和改进SVM算法的学者。可以参考。来自数据挖掘工具YALE工具包。

/*
 *  YALE - Yet Another Learning Environment
 *  Copyright (C) 2001-2004
 *      Simon Fischer, Ralf Klinkenberg, Ingo Mierswa, 
 *          Katharina Morik, Oliver Ritthoff
 *      Artificial Intelligence Unit
 *      Computer Science Department
 *      University of Dortmund
 *      44221 Dortmund,  Germany
 *  email: [e-mail]
 *  web:   http://yale.cs.uni-dortmund.de/
 *
 *  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., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 *  USA.
 */
package edu.udo.cs.yale.gui;

import edu.udo.cs.yale.Yale;
import edu.udo.cs.yale.tools.LogService;

import java.io.OutputStream;
import javax.swing.JTextArea;
import javax.swing.JScrollPane;
import javax.swing.JViewport;
import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.JPopupMenu;
import java.awt.event.ActionEvent;
import javax.swing.KeyStroke;
import java.awt.event.KeyEvent;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.KeyEvent;
import java.awt.event.InputEvent;
import java.io.File;
import java.io.FileWriter;
import java.io.PrintWriter;
import java.io.IOException;

/** A text area displaying the log output. All kinds of streams can be redirected to this 
 *  viewer by using an instance of a special inner stream subclass. */
public class MessageViewer extends JScrollPane implements MouseListener {

    private class ClearMessageAction extends AbstractAction {
	private ClearMessageAction() { 
	    super("Clear message viewer"); 
   	    putValue(SHORT_DESCRIPTION, "Clear the message viewer");
	    putValue(MNEMONIC_KEY, new Integer(KeyEvent.VK_C));
	}
	public void actionPerformed(ActionEvent e) {
	    textArea.setText("");
	}
    }

    private class SaveLogFileAction extends AbstractAction {
	private SaveLogFileAction() {
	    super("Save log file...");
   	    putValue(SHORT_DESCRIPTION, "Save the logging output to a file");
	    putValue(MNEMONIC_KEY, new Integer(KeyEvent.VK_S));
  	}
	public void actionPerformed(ActionEvent e) {
	    File file = new File("./");
	    String logFile = Yale.getExperiment().getRootOperator().getParameterAsString("logfile");
	    if (logFile != null) {
		file = Yale.getExperiment().resolveFileName(logFile);
	    } else {
		file = Yale.getExperiment().getExperimentFile();
		if (file != null) file = file.getParentFile();
	    }
	    file = SwingTools.chooseFile(MessageViewer.this, file, false);
	    if (file != null) {
		try {
		    PrintWriter out = new PrintWriter(new FileWriter(file));
		    out.println(textArea.getText());
		    out.close();
		} catch (IOException ex) {
		    SwingTools.showErrorMessage("Cannot write log file.", ex);
		}
	    }
	}
    }

    private class FindAction extends AbstractAction {
	private FindAction() {
	    super("Find...");
   	    putValue(SHORT_DESCRIPTION, "Find text in the logging output.");
	    putValue(MNEMONIC_KEY, new Integer(KeyEvent.VK_F));
	    putValue(ACCELERATOR_KEY, KeyStroke.getKeyStroke(KeyEvent.VK_F, InputEvent.CTRL_MASK));
	}
	public void actionPerformed(ActionEvent e) {
	    new SearchDialog(MessageViewer.this, textArea).show();
	}
    }


    /** A special output stream that appends all its incoming characters to the text field as soon
     *  as it reads a newline. */
    private class MessageViewerOutputStream extends OutputStream {
        private StringBuffer currentString;
        private MessageViewerOutputStream() {
            this.currentString = new StringBuffer();
        }
        public void write(int b) {
            char c = (char)b;
            switch (b) {
            case 0x000a:
            case 0x000d:
                if (currentString.length() > 0) {
                    textArea.append(currentString.toString()+"\n");
		    //getVerticalScrollBar().setValue(getVerticalScrollBar().getMaximum());
		    textArea.setCaretPosition(textArea.getDocument().getLength()); 
                    currentString = new StringBuffer();
                }
                break;
            case '\t':
                currentString.append("   ");
                break;
            default:
                currentString.append(c);
                break;
            }
        }
    }

    /** A stream that can be used to print to this text area. */
    public final OutputStream outputStream          = new MessageViewerOutputStream();

    public final Action CLEAR_MESSAGE_VIEWER_ACTION = new ClearMessageAction();
    public final Action SAVE_LOGFILE_ACTION         = new SaveLogFileAction();
    public final Action FIND_ACTION                 = new FindAction();

    private JTextArea textArea;
    private String searchPattern = null;

    public MessageViewer() {
	this(new JTextArea(8,40));
    }

    private MessageViewer(JTextArea textArea) {
	super(textArea);
	this.textArea = textArea;
	textArea.setEditable(false);	
	textArea.addMouseListener(this);
    }

    public void mouseEntered(MouseEvent e) {}
    public void mouseExited(MouseEvent e) {}
    public void mouseReleased(MouseEvent e) {}
    public void mouseClicked(MouseEvent e) {}
    public void mousePressed(MouseEvent e) {
	if (e.getModifiers() == MouseEvent.BUTTON3_MASK) {
	    createPopupMenu().show(textArea, e.getX(), e.getY());
	}
    }

    public JPopupMenu createPopupMenu() {
	JPopupMenu menu = new JPopupMenu();
	menu.add(CLEAR_MESSAGE_VIEWER_ACTION);
	menu.add(SAVE_LOGFILE_ACTION);
	menu.add(FIND_ACTION);
	return menu;
    }

    public String getLogMessage() {
	return textArea.getText();
    }
}