1   /**
 2      Starting from this category, search the category hierarchy for a
 3      non-null level and return it. Otherwise, return the level of the
 4      root category.
 5
 6      <p>The Category class is designed so that this method executes as
 7      quickly as possible.
 8    */
 9   public
10   Level getEffectiveLevel() {
11     for(Category c = this; c != null; c=c.parent) {
12       if(c.level != null) {
13         return c.level;
14     }
15     }
16     return null; // If reached will cause an NullPointerException.
17   }

  /**Add <code>newAppender</code> to the list of appenders of thisCategory instance.<p>If <code>newAppender</code> is already in the list ofappenders, then it won't be added again.*/synchronizedpublicvoid addAppender(Appender newAppender) {if(aai == null) {aai = new AppenderAttachableImpl();}aai.addAppender(newAppender);repository.fireAddAppenderEvent(this, newAppender);}

  /**Attach an appender. If the appender is already in the list inwon't be added again.*/publicvoid addAppender(Appender newAppender) {// Null values for newAppender parameter are strictly forbidden.if(newAppender == null) {return;}if(appenderList == null) {appenderList = new Vector(1);}if(!appenderList.contains(newAppender)) {appenderList.addElement(newAppender);}}

  publicvoid debug(Object message) {if(repository.isDisabled(Level.DEBUG_INT)) {return;}if(Level.DEBUG.isGreaterOrEqual(this.getEffectiveLevel())) {forcedLog(FQCN, Level.DEBUG, message, null);}}

  /**This method creates a new logging event and logs the eventwithout further checks.  */protectedvoid forcedLog(String fqcn, Priority level, Object message, Throwable t) {callAppenders(new LoggingEvent(fqcn, this, level, message, t));}

  publicvoid callAppenders(LoggingEvent event) {int writes = 0;for(Category c = this; c != null; c=c.parent) {// Protected against simultaneous call to addAppender, removeAppender,...synchronized(c) {if(c.aai != null) {writes += c.aai.appendLoopOnAppenders(event);}if(!c.additive) {break;}}}if(writes == 0) {repository.emitNoAppenderWarning(this);}}

  publicvoid debug(Object message) {if(repository.isDisabled(Level.DEBUG_INT)) {return;}
...

  publicboolean isDisabled(int level) {return thresholdInt > level;}

 publicsynchronized void doAppend(LoggingEvent event) {if(closed) {LogLog.error("Attempted to append to closed appender named ["+name+"].");return;}if(!isAsSevereAsThreshold(event.getLevel())) {return;}Filter f = this.headFilter;FILTER_LOOP:while(f != null) {switch(f.decide(event)) {case Filter.DENY: return;case Filter.ACCEPT: break FILTER_LOOP;case Filter.NEUTRAL: f = f.getNext();}}this.append(event);    }

  static {// By default we use a DefaultRepositorySelector which always returns 'h'.Hierarchy h = new Hierarchy(new RootLogger(Level.DEBUG));repositorySelector = new DefaultRepositorySelector(h);
}

public static Logger LOG = LogManager.getLogger(TestMain.class);