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package de.lmu.ifi.dbs.elki.logging;
/*
This file is part of ELKI:
Environment for Developing KDD-Applications Supported by Index-Structures
Copyright (C) 2012
Ludwig-Maximilians-Universität München
Lehr- und Forschungseinheit für Datenbanksysteme
ELKI Development Team
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero 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 Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
import java.util.logging.Formatter;
import java.util.logging.LogRecord;
import de.lmu.ifi.dbs.elki.logging.progress.ProgressLogRecord;
/**
* Format a log record for error output, including a stack trace if available.
*
* @author Erich Schubert
*/
// TODO: make more configurable and handle suppressed exceptions
public class ErrorFormatter extends Formatter {
/**
* List of packages to prune from stack traces at the end.
*
* TODO: make configurable via logging.properties
*/
public static final String[] PRUNE = {//
"de.lmu.ifi.dbs.elki.gui.minigui.MiniGUI", //
"de.lmu.ifi.dbs.elki.KDDTask", //
"java.awt.event.", //
"java.awt.EventDispatchThread",//
"java.awt.EventQueue",//
"java.security.",//
"java.lang.Thread",//
"java.util.concurrent.",//
"javax.swing.SwingWorker", //
"java.util.concurrent.FutureTask", //
"org.apache.batik.", //
};
/**
* Constructor.
*/
public ErrorFormatter() {
super();
}
@Override
public String format(LogRecord record) {
if (record instanceof ProgressLogRecord) {
return record.getMessage();
}
String msg = record.getMessage();
StringBuilder buf = new StringBuilder();
if (msg != null) {
buf.append(msg);
if (!msg.endsWith(OutputStreamLogger.NEWLINE)) {
buf.append(OutputStreamLogger.NEWLINE);
}
} else {
buf.append("null" + OutputStreamLogger.NEWLINE);
}
if (record.getThrown() != null) {
appendCauses(buf, record.getThrown());
}
return buf.toString();
}
/**
* Append (pruned) stack traces for associated exceptions.
*
* @param buf Buffer to append to
* @param thrown Throwable to format.
*/
private void appendCauses(StringBuilder buf, Throwable thrown) {
buf.append(thrown.toString()).append(OutputStreamLogger.NEWLINE);
StackTraceElement[] stack = thrown.getStackTrace();
int end = stack.length - 1;
prune: for (; end >= 0; end--) {
String cn = stack[end].getClassName();
for (String pat : PRUNE) {
if (cn.startsWith(pat)) {
continue prune;
}
}
break;
}
if (end <= 0) {
end = stack.length - 1;
}
for (int i = 0; i <= end; i++) {
buf.append("\tat ").append(stack[i]).append(OutputStreamLogger.NEWLINE);
}
if (end < stack.length - 1) {
buf.append("\tat [...]").append(OutputStreamLogger.NEWLINE);
}
if (thrown.getCause() != null) {
buf.append("Caused by: ");
appendCauses(buf, thrown.getCause());
}
}
}
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