Appender parseAppender()

in src/main/java/org/apache/log4j/PropertyConfigurator.java [775:848]
68 lines of code
12 McCabe index (conditional complexity)

  Appender parseAppender(Properties props, String appenderName) {
    Appender appender = registryGet(appenderName);
    if((appender != null)) {
      LogLog.debug("Appender \"" + appenderName + "\" was already parsed.");
      return appender;
    }
    // Appender was not previously initialized.
    String prefix = APPENDER_PREFIX + appenderName;
    String layoutPrefix = prefix + ".layout";

    appender = (Appender) OptionConverter.instantiateByKey(props, prefix,
					      org.apache.log4j.Appender.class,
					      null);
    if(appender == null) {
      LogLog.error(
              "Could not instantiate appender named \"" + appenderName+"\".");
      return null;
    }
    appender.setName(appenderName);

    if(appender instanceof OptionHandler) {
      if(appender.requiresLayout()) {
	Layout layout = (Layout) OptionConverter.instantiateByKey(props,
								  layoutPrefix,
								  Layout.class,
								  null);
	if(layout != null) {
	  appender.setLayout(layout);
	  LogLog.debug("Parsing layout options for \"" + appenderName +"\".");
	  //configureOptionHandler(layout, layoutPrefix + ".", props);
          PropertySetter.setProperties(layout, props, layoutPrefix + ".");
	  LogLog.debug("End of parsing for \"" + appenderName +"\".");
	}
      }
      final String errorHandlerPrefix = prefix + ".errorhandler";
      String errorHandlerClass = OptionConverter.findAndSubst(errorHandlerPrefix, props);
      if (errorHandlerClass != null) {
    		ErrorHandler eh = (ErrorHandler) OptionConverter.instantiateByKey(props,
					  errorHandlerPrefix,
					  ErrorHandler.class,
					  null);
    		if (eh != null) {
    			  appender.setErrorHandler(eh);
    			  LogLog.debug("Parsing errorhandler options for \"" + appenderName +"\".");
    			  parseErrorHandler(eh, errorHandlerPrefix, props, repository);
    			  final Properties edited = new Properties();
    			  final String[] keys = new String[] { 
    					  errorHandlerPrefix + "." + ROOT_REF,
    					  errorHandlerPrefix + "." + LOGGER_REF,
    					  errorHandlerPrefix + "." + APPENDER_REF_TAG
    			  };
    			  for(Iterator iter = props.entrySet().iterator();iter.hasNext();) {
    				  Map.Entry entry = (Map.Entry) iter.next();
    				  int i = 0;
    				  for(; i < keys.length; i++) {
    					  if(keys[i].equals(entry.getKey())) break;
    				  }
    				  if (i == keys.length) {
    					  edited.put(entry.getKey(), entry.getValue());
    				  }
    			  }
    		      PropertySetter.setProperties(eh, edited, errorHandlerPrefix + ".");
    			  LogLog.debug("End of errorhandler parsing for \"" + appenderName +"\".");
    		}
    	  
      }
      //configureOptionHandler((OptionHandler) appender, prefix + ".", props);
      PropertySetter.setProperties(appender, props, prefix + ".");
      LogLog.debug("Parsed \"" + appenderName +"\" options.");
    }
    parseAppenderFilters(props, appenderName, appender);
    registryPut(appender);
    return appender;
  }