2 * Jalview - A Sequence Alignment Editor and Viewer ($$Version-Rel$$)
3 * Copyright (C) $$Year-Rel$$ The Jalview Authors
5 * This file is part of Jalview.
7 * Jalview is free software: you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation, either version 3
10 * of the License, or (at your option) any later version.
12 * Jalview is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty
14 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR
15 * PURPOSE. See the GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with Jalview. If not, see <http://www.gnu.org/licenses/>.
19 * The Jalview Authors are detailed in the 'AUTHORS' file.
23 import javax.swing.JTextArea;
24 import javax.swing.SwingUtilities;
26 import org.apache.log4j.WriterAppender;
27 import org.apache.log4j.spi.LoggingEvent;
30 * From http://textareaappender.zcage.com/ the means to capture the logs, too.
31 * Simple example of creating a Log4j appender that will write to a JTextArea.
33 public class JalviewAppender extends WriterAppender
38 private JTextArea jTextArea = null;
40 /** Set the target JTextArea for the logging information to appear. */
41 public void setTextArea(JTextArea jTextArea)
43 this.jTextArea = jTextArea;
47 * Format and then append the loggingEvent to the stored JTextArea.
50 public void append(LoggingEvent loggingEvent)
52 final String message = this.layout.format(loggingEvent);
54 // Append formatted message to textarea using the Swing Thread.
55 SwingUtilities.invokeLater(new Runnable()
60 if (jTextArea != null)
62 jTextArea.append(message);