org.eclipse.jetty.util.log.AbstractLogger Maven / Gradle / Ivy
//
// ========================================================================
// Copyright (c) 1995-2016 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package org.eclipse.jetty.util.log;
/* ------------------------------------------------------------ */
/** Abstract Logger.
* Manages the atomic registration of the logger by name.
*/
public abstract class AbstractLogger implements Logger
{
public final Logger getLogger(String name)
{
if (isBlank(name))
return this;
final String basename = getName();
final String fullname = (isBlank(basename) || Log.getRootLogger()==this)?name:(basename + "." + name);
Logger logger = Log.getLoggers().get(fullname);
if (logger == null)
{
Logger newlog = newLogger(fullname);
logger = Log.getMutableLoggers().putIfAbsent(fullname,newlog);
if (logger == null)
logger=newlog;
}
return logger;
}
protected abstract Logger newLogger(String fullname);
/**
* A more robust form of name blank test. Will return true for null names, and names that have only whitespace
*
* @param name
* the name to test
* @return true for null or blank name, false if any non-whitespace character is found.
*/
private static boolean isBlank(String name)
{
if (name == null)
{
return true;
}
int size = name.length();
char c;
for (int i = 0; i < size; i++)
{
c = name.charAt(i);
if (!Character.isWhitespace(c))
{
return false;
}
}
return true;
}
}