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;
      }
  }