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 java.io.Serializable;
24 import java.nio.charset.StandardCharsets;
26 import javax.swing.JTextArea;
27 import javax.swing.SwingUtilities;
29 import org.apache.logging.log4j.Level;
30 import org.apache.logging.log4j.core.Filter;
31 import org.apache.logging.log4j.core.Layout;
32 import org.apache.logging.log4j.core.LogEvent;
33 import org.apache.logging.log4j.core.appender.AbstractAppender;
34 import org.apache.logging.log4j.core.config.Property;
36 import jalview.log.JLoggerI.LogLevel;
37 import jalview.util.Log4j;
40 * From http://textareaappender.zcage.com/ the means to capture the logs, too.
41 * Simple example of creating a Log4j appender that will write to a JTextArea.
43 public class JalviewAppender extends AbstractAppender
45 public final static String NAME = "JalviewAppender";
47 public JalviewAppender()
52 public JalviewAppender(LogLevel loglevel)
55 Log4j.getThresholdFilter(loglevel == null ? Level.INFO
56 : Log4j.log4jLevel(loglevel)),
57 Log4j.getSimpleLayout(), false, new Property[0]);
60 protected JalviewAppender(String name, Filter filter,
61 Layout<? extends Serializable> layout, boolean ignoreExceptions,
62 Property[] properties)
64 super(name, filter, layout, ignoreExceptions, properties);
65 // TODO Auto-generated constructor stub
68 static private JTextArea jTextArea = null;
70 /** Set the target JTextArea for the logging information to appear. */
71 static public void setTextArea(JTextArea jTextArea)
73 JalviewAppender.jTextArea = jTextArea;
77 * Format and then append the loggingEvent to the stored JTextArea.
79 public void append(LogEvent logEvent)
81 final String message = new String(
82 this.getLayout().toByteArray(logEvent), StandardCharsets.UTF_8);
84 // Append formatted message to textarea using the Swing Thread.
85 SwingUtilities.invokeLater(new Runnable()
89 if (jTextArea != null)
91 jTextArea.append(message);