public final Logger getLogger(final String name) {
if (name == null) {
throw new IllegalArgumentException("name argument cannot be null");
}
// if we are asking for the root logger, then let us return it without
// wasting time
if (Logger.ROOT_LOGGER_NAME.equalsIgnoreCase(name)) {
return root;
}
int i = 0;
Logger logger = root;
// check if the desired logger exists, if it does, return it
// without further ado.
Logger childLogger = (Logger) loggerCache.get(name);
// if we have the child, then let us return it without wasting time
if (childLogger != null) {
return childLogger;
}
// if the desired logger does not exist, them create all the loggers
// in between as well (if they don't already exist)
String childName;
while (true) {
int h = name.indexOf(ClassicConstants.LOGGER_SEPARATOR, i);
if (h == -1) {
childName = name;
} else {
childName = name.substring(0, h);
}
// move i left of the last point
i = h + 1;
synchronized (logger) {
childLogger = logger.getChildByName(childName);
if (childLogger == null) {
childLogger = logger.createChildByName(childName);
loggerCache.put(childName, childLogger);
incSize();
}
}
logger = childLogger;
if (h == -1) {
return childLogger;
}
}
}
