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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.log4j.helpers;
/**
SingleLineTracerPrintWriter overrides the println function in
TracerPrintWriter by replacing the TAB character with spaces.
It also does not print the "\n".
<p>
The default format generated by TracerPrintWriter for exceptions
prints on multiple lines, which does not interact well with some
logging systems. On the other hand, a stack-trace on one line can be a
mite difficult to read, so this class should only be used where really
necessary :-)
<p>
For syslog daemons, tabs in messages are not friendly, hence the
replacement of tabs by spaces here. It shouldn't do any harm to
do this for all messages...
<p>
Perhaps it might be better to enhance TracerPrintWriter to have
a configuration item for one-line or multi-line mode...
*/
public class SingleLineTracerPrintWriter extends TracerPrintWriter {
static String TAB = " ";
public SingleLineTracerPrintWriter(QuietWriter qWriter) {
super(qWriter);
}
/**
Make the first Exception line print properly by omitting the \n at the
end.
*/
public
void println(Object o) {
this.qWriter.write(o.toString());
}
// Note: the Char[] form is handled by the TracerPrinterWriter super
// class
/**
Remove the first character from the string (usually a TAB) and do
not print "\n"
*/
public
void println(String s) {
// remove '^I' and replace it with 4 spaces
this.qWriter.write(TAB+s.substring(1));
}
}
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