PropertyConfigurator.java 文件源码

/**
   Check the provided <code>Properties</code> object for a
   {@link org.apache.log4j.spi.LoggerFactory LoggerFactory}
   entry specified by {@link #LOGGER_FACTORY_KEY}.  If such an entry
   exists, an attempt is made to create an instance using the default
   constructor.  This instance is used for subsequent Category creations
   within this configurator.

   @see #parseCatsAndRenderers
 */
protected void configureLoggerFactory(Properties props) {
  String factoryClassName = OptionConverter.findAndSubst(LOGGER_FACTORY_KEY,
                       props);
  if(factoryClassName != null) {
    LogLog.debug("Setting category factory to ["+factoryClassName+"].");
    loggerFactory = (LoggerFactory)
         OptionConverter.instantiateByClassName(factoryClassName,
                     LoggerFactory.class,
                     loggerFactory);
    PropertySetter.setProperties(loggerFactory, props, FACTORY_PREFIX + ".");
  }
}