Java 类org.apache.log4j.spi.RendererSupport 实例源码

public
String getRenderedMessage() {
   if(renderedMessage == null && message != null) {
     if(message instanceof String)
renderedMessage = (String) message;
     else {
LoggerRepository repository = logger.getLoggerRepository();

if(repository instanceof RendererSupport) {
  RendererSupport rs = (RendererSupport) repository;
  renderedMessage= rs.getRendererMap().findAndRender(message);
} else {
  renderedMessage = message.toString();
}
     }
   }
   return renderedMessage;
}

/**
    Add a renderer to a hierarchy passed as parameter.
 */
 static
 public
 void addRenderer(RendererSupport repository, String renderedClassName,
       String renderingClassName) {
   LogLog.debug("Rendering class: ["+renderingClassName+"], Rendered class: ["+
     renderedClassName+"].");
   ObjectRenderer renderer = (ObjectRenderer)
            OptionConverter.instantiateByClassName(renderingClassName,
                        ObjectRenderer.class,
                        null);
   if(renderer == null) {
     LogLog.error("Could not instantiate renderer ["+renderingClassName+"].");
     return;
   } else {
     try {
Class renderedClass = Loader.loadClass(renderedClassName);
repository.setRenderer(renderedClass, renderer);
     } catch(ClassNotFoundException e) {
LogLog.error("Could not find class ["+renderedClassName+"].", e);
     }
   }
 }

/**
    Add a renderer to a hierarchy passed as parameter.
 */
 static
 public
 void addRenderer(RendererSupport repository, String renderedClassName,
       String renderingClassName) {
   LogLog.debug("Rendering class: ["+renderingClassName+"], Rendered class: ["+
     renderedClassName+"].");
   ObjectRenderer renderer = (ObjectRenderer)
            OptionConverter.instantiateByClassName(renderingClassName,
                        ObjectRenderer.class,
                        null);
   if(renderer == null) {
     LogLog.error("Could not instantiate renderer ["+renderingClassName+"].");
     return;
   } else {
     try {
Class renderedClass = Loader.loadClass(renderedClassName);
repository.setRenderer(renderedClass, renderer);
     } catch(ClassNotFoundException e) {
LogLog.error("Could not find class ["+renderedClassName+"].", e);
     }
   }
 }

/**
    Parse non-root elements, such non-root categories and renderers.
 */
 protected
 void parseCatsAndRenderers(Properties props, LoggerRepository hierarchy) {
   Enumeration enumeration = props.propertyNames();
   while(enumeration.hasMoreElements()) {
     String key = (String) enumeration.nextElement();
     if(key.startsWith(CATEGORY_PREFIX) || key.startsWith(LOGGER_PREFIX)) {
String loggerName = null;
if(key.startsWith(CATEGORY_PREFIX)) {
  loggerName = key.substring(CATEGORY_PREFIX.length());
} else if(key.startsWith(LOGGER_PREFIX)) {
  loggerName = key.substring(LOGGER_PREFIX.length());
}
String value =  OptionConverter.findAndSubst(key, props);
Logger logger = hierarchy.getLogger(loggerName, loggerFactory);
synchronized(logger) {
  parseCategory(props, logger, key, loggerName, value);
  parseAdditivityForLogger(props, logger, loggerName);
}
     } else if(key.startsWith(RENDERER_PREFIX)) {
String renderedClass = key.substring(RENDERER_PREFIX.length());
String renderingClass = OptionConverter.findAndSubst(key, props);
if(hierarchy instanceof RendererSupport) {
  RendererMap.addRenderer((RendererSupport) hierarchy, renderedClass,
              renderingClass);
}
     }
   }
 }

/**
    Add a renderer to a hierarchy passed as parameter.
 */
 static
 public
 void addRenderer(RendererSupport repository, String renderedClassName,
       String renderingClassName) {
   LogLog.debug("Rendering class: ["+renderingClassName+"], Rendered class: ["+
     renderedClassName+"].");
   ObjectRenderer renderer = (ObjectRenderer)
            OptionConverter.instantiateByClassName(renderingClassName,
                        ObjectRenderer.class,
                        null);
   if(renderer == null) {
     LogLog.error("Could not instantiate renderer ["+renderingClassName+"].");
     return;
   } else {
     try {
Class renderedClass = Loader.loadClass(renderedClassName);
repository.setRenderer(renderedClass, renderer);
     } catch(ClassNotFoundException e) {
LogLog.error("Could not find class ["+renderedClassName+"].", e);
     }
   }
 }

protected 
void parseRenderer(Element element) {
  String renderingClass = subst(element.getAttribute(RENDERING_CLASS_ATTR));
  String renderedClass = subst(element.getAttribute(RENDERED_CLASS_ATTR));
  if(repository instanceof RendererSupport) {
    RendererMap.addRenderer((RendererSupport) repository, renderedClass, 
          renderingClass);
  }
}

protected 
void parseRenderer(Element element) {
  String renderingClass = subst(element.getAttribute(RENDERING_CLASS_ATTR));
  String renderedClass = subst(element.getAttribute(RENDERED_CLASS_ATTR));
  if(repository instanceof RendererSupport) {
    RendererMap.addRenderer((RendererSupport) repository, renderedClass, 
          renderingClass);
  }
}

/**
    Parse non-root elements, such non-root categories and renderers.
 */
 protected
 void parseCatsAndRenderers(Properties props, LoggerRepository hierarchy) {
   Enumeration enumeration = props.propertyNames();
   while(enumeration.hasMoreElements()) {
     String key = (String) enumeration.nextElement();
     if(key.startsWith(CATEGORY_PREFIX) || key.startsWith(LOGGER_PREFIX)) {
String loggerName = null;
if(key.startsWith(CATEGORY_PREFIX)) {
  loggerName = key.substring(CATEGORY_PREFIX.length());
} else if(key.startsWith(LOGGER_PREFIX)) {
  loggerName = key.substring(LOGGER_PREFIX.length());
}
String value =  OptionConverter.findAndSubst(key, props);
Logger logger = hierarchy.getLogger(loggerName, loggerFactory);
synchronized(logger) {
  parseCategory(props, logger, key, loggerName, value);
  parseAdditivityForLogger(props, logger, loggerName);
}
     } else if(key.startsWith(RENDERER_PREFIX)) {
String renderedClass = key.substring(RENDERER_PREFIX.length());
String renderingClass = OptionConverter.findAndSubst(key, props);
if(hierarchy instanceof RendererSupport) {
  RendererMap.addRenderer((RendererSupport) hierarchy, renderedClass,
              renderingClass);
}
     }
   }
 }

/**
    Parse non-root elements, such non-root categories and renderers.
 */
 protected
 void parseCatsAndRenderers(Properties props, LoggerRepository hierarchy) {
   Enumeration enumeration = props.propertyNames();
   while(enumeration.hasMoreElements()) {
     String key = (String) enumeration.nextElement();
     if(key.startsWith(CATEGORY_PREFIX) || key.startsWith(LOGGER_PREFIX)) {
String loggerName = null;
if(key.startsWith(CATEGORY_PREFIX)) {
  loggerName = key.substring(CATEGORY_PREFIX.length());
} else if(key.startsWith(LOGGER_PREFIX)) {
  loggerName = key.substring(LOGGER_PREFIX.length());
}
String value =  OptionConverter.findAndSubst(key, props);
Logger logger = hierarchy.getLogger(loggerName, loggerFactory);
synchronized(logger) {
  parseCategory(props, logger, key, loggerName, value);
  parseAdditivityForLogger(props, logger, loggerName);
}
     } else if(key.startsWith(RENDERER_PREFIX)) {
String renderedClass = key.substring(RENDERER_PREFIX.length());
String renderingClass = OptionConverter.findAndSubst(key, props);
if(hierarchy instanceof RendererSupport) {
  RendererMap.addRenderer((RendererSupport) hierarchy, renderedClass,
              renderingClass);
}
     } else if (key.equals(THROWABLE_RENDERER_PREFIX)) {
         if (hierarchy instanceof ThrowableRendererSupport) {
           ThrowableRenderer tr = (ThrowableRenderer)
                 OptionConverter.instantiateByKey(props,
                         THROWABLE_RENDERER_PREFIX,
                         org.apache.log4j.spi.ThrowableRenderer.class,
                         null);
           if(tr == null) {
               LogLog.error(
                   "Could not instantiate throwableRenderer.");
           } else {
               PropertySetter setter = new PropertySetter(tr);
               setter.setProperties(props, THROWABLE_RENDERER_PREFIX + ".");
               ((ThrowableRendererSupport) hierarchy).setThrowableRenderer(tr);

           }
         }
     }
   }
 }