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The MEKA project provides an open source implementation of methods for multi-label classification and evaluation. It is based on the WEKA Machine Learning Toolkit. Several benchmark methods are also included, as well as the pruned sets and classifier chains methods, other methods from the scientific literature, and a wrapper to the MULAN framework.

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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 .
 */

/**
 * LogTab.java
 * Copyright (C) 2015 University of Waikato, Hamilton, New Zealand
 */
package meka.gui.explorer;

import com.googlecode.jfilechooserbookmarks.gui.BaseScrollPane;
import meka.core.FileUtils;
import meka.gui.core.GUIHelper;
import meka.gui.choosers.MekaFileChooser;
import weka.gui.ExtensionFileFilter;

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.text.SimpleDateFormat;
import java.util.Date;

/**
 * For logging output.
 *
 * @author  fracpete (fracpete at waikato dot ac dot nz)
 * @version $Revision: 606 $
 */
public class LogTab
		extends AbstractExplorerTab {

	/** for serialization. */
	private static final long serialVersionUID = 7200133227901982729L;

	/** the panel for visualizing the data. */
	protected JTextArea m_TextArea;

	/** the button for clearing the log. */
	protected JButton m_ButtonClear;

	/** the button for saving the log. */
	protected JButton m_ButtonSave;

	/** the formatter for the timestamp. */
	protected SimpleDateFormat m_Formatter;

	/** the filechooser for saving the log. */
	protected MekaFileChooser m_FileChooser;

	/**
	 * Initializes the members.
	 */
	@Override
	protected void initialize() {
		ExtensionFileFilter     filter;

		super.initialize();

		m_Formatter   = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
		m_FileChooser = GUIHelper.newFileChooser();
		filter        = new ExtensionFileFilter(".log", "Log files");
		m_FileChooser.addChoosableFileFilter(filter);
		m_FileChooser.setFileFilter(filter);
		m_FileChooser.setAcceptAllFileFilterUsed(true);
	}

	/**
	 * Initializes the widgets.
	 */
	@Override
	protected void initGUI() {
		JPanel      panel;

		super.initGUI();

		m_TextArea = new JTextArea(20, 40);
		m_TextArea.setFont(GUIHelper.getMonospacedFont());
		m_TextArea.setEditable(false);
		add(new BaseScrollPane(m_TextArea), BorderLayout.CENTER);

		panel = new JPanel(new FlowLayout(FlowLayout.RIGHT));
		add(panel, BorderLayout.SOUTH);

		m_ButtonClear = new JButton("Clear", GUIHelper.getIcon("new.gif"));
		m_ButtonClear.addActionListener(new ActionListener() {
			@Override
			public void actionPerformed(ActionEvent e) {
				clear();
			}
		});
		panel.add(m_ButtonClear);

		m_ButtonSave = new JButton("Save", GUIHelper.getIcon("save.gif"));
		m_ButtonSave.addActionListener(new ActionListener() {
			@Override
			public void actionPerformed(ActionEvent e) {
				save();
			}
		});
		panel.add(m_ButtonSave);
	}

	/**
	 * Returns the title of the tab.
	 *
	 * @return the title
	 */
	@Override
	public String getTitle() {
		return "Log";
	}

	/**
	 * Removes the logging content.
	 */
	protected synchronized void clear() {
		m_TextArea.setText("");
	}

	/**
	 * Saves the logging content.
	 */
	protected synchronized void save() {
		int             retVal;
		File            file;
		String          text;
		FileWriter      fwriter;
		BufferedWriter  bwriter;

		retVal = m_FileChooser.showOpenDialog(this);
		if (retVal != MekaFileChooser.APPROVE_OPTION)
			return;

		file    = m_FileChooser.getSelectedFile();
		text    = m_TextArea.getText();
		fwriter = null;
		bwriter = null;
		try {
			fwriter = new FileWriter(file);
			bwriter = new BufferedWriter(fwriter);
			bwriter.write(text);
			bwriter.newLine();
			bwriter.flush();
			log("Log successfully saved to: " + file);
		}
		catch (Exception e) {
			handleException("Failed to save log output to: " + file, e);
		}
		finally {
			FileUtils.closeQuietly(bwriter);
			FileUtils.closeQuietly(fwriter);
		}
	}

	/**
	 * For logging messages.
	 *
	 * @param tab       the origin of the message
	 * @param msg       the message to output
	 */
	protected synchronized void log(AbstractExplorerTab tab, String msg) {
		m_TextArea.append("[" + m_Formatter.format(new Date()) + "] ");
		if (tab != null)
			m_TextArea.append(tab.getTitle() + ": " + msg);
		else
			m_TextArea.append(msg);
		m_TextArea.append("\n");
		m_TextArea.setCaretPosition(m_TextArea.getDocument().getLength());
	}
}