Examples of org.apache.log4j.spi.ErrorHandler

org.apache.log4j.spi.ErrorHandler
Appenders may delegate their error handling to ErrorHandlers.
Error handling is a particularly tedious to get right because by definition errors are hard to predict and to reproduce.
Please take the time to contact the author in case you discover that errors are not properly handled. You are most welcome to suggest new error handling policies or criticize existing policies. @author Ceki Gülcü

  /**
     Used internally to parse an {@link ErrorHandler} element.
   */
  protected
  void parseErrorHandler(Element element, Appender appender) {
    ErrorHandler eh = (ErrorHandler) OptionConverter.instantiateByClassName(
                                       subst(element.getAttribute(CLASS_ATTR)),
                                       org.apache.log4j.spi.ErrorHandler.class, 
                null);
    
    if(eh != null) {
      eh.setAppender(appender);


      PropertySetter propSetter = new PropertySetter(eh);
      NodeList children = element.getChildNodes();
      final int length   = children.getLength();


      for (int loop = 0; loop < length; loop++) {
  Node currentNode = children.item(loop);
  if (currentNode.getNodeType() == Node.ELEMENT_NODE) {
    Element currentElement = (Element) currentNode;
    String tagName = currentElement.getTagName();
    if(tagName.equals(PARAM_TAG)) {
            setParameter(currentElement, propSetter);
    } else if(tagName.equals(APPENDER_REF_TAG)) {
      eh.setBackupAppender(findAppenderByReference(currentElement));
    } else if(tagName.equals(LOGGER_REF)) {
      String loggerName = currentElement.getAttribute(REF_ATTR);      
      Logger logger = (catFactory == null) ? repository.getLogger(loggerName)
                : repository.getLogger(loggerName, catFactory);
      eh.setLogger(logger);
    } else if(tagName.equals(ROOT_REF)) {
      Logger root = repository.getRootLogger();
      eh.setLogger(root);
    } else {
          quietParseUnrecognizedElement(eh, currentElement, props);
      }
  }
      }

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    }
  }




    private QuietWriter createQuietWriter(final Writer writer) {
         ErrorHandler handler = errorHandler;
         if (handler == null) {
             handler = new DefaultErrorHandler(this);
         }
         return new QuietWriter(writer, handler);
     }

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        }


    }


    protected QuietWriter createQuietWriter(final Writer writer) {
        ErrorHandler handler = errorHandler;
        if (handler == null) {
            handler = new DefaultErrorHandler(this);
        }
        return new QuietWriter(writer, handler);
    }

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    }
  }




    private QuietWriter createQuietWriter(final Writer writer) {
         ErrorHandler handler = errorHandler;
         if (handler == null) {
             handler = new DefaultErrorHandler(this);
         }
         return new QuietWriter(writer, handler);
     }

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  /**
     Used internally to parse an {@link ErrorHandler} element.
   */
  protected
  void parseErrorHandler(Element element, Appender appender) {
    ErrorHandler eh = (ErrorHandler) OptionConverter.instantiateByClassName(
                                       subst(element.getAttribute(CLASS_ATTR)),
                                       org.apache.log4j.spi.ErrorHandler.class, 
                null);
    
    if(eh != null) {
      eh.setAppender(appender);


      PropertySetter propSetter = new PropertySetter(eh);
      NodeList children = element.getChildNodes();
      final int length   = children.getLength();


      for (int loop = 0; loop < length; loop++) {
  Node currentNode = children.item(loop);
  if (currentNode.getNodeType() == Node.ELEMENT_NODE) {
    Element currentElement = (Element) currentNode;
    String tagName = currentElement.getTagName();
    if(tagName.equals(PARAM_TAG)) {
            setParameter(currentElement, propSetter);
    } else if(tagName.equals(APPENDER_REF_TAG)) {
      eh.setBackupAppender(findAppenderByReference(currentElement));
    } else if(tagName.equals(LOGGER_REF)) {
      String loggerName = currentElement.getAttribute(REF_ATTR);      
      Logger logger = (catFactory == null) ? repository.getLogger(loggerName)
                : repository.getLogger(loggerName, catFactory);
      eh.setLogger(logger);
    } else if(tagName.equals(ROOT_REF)) {
      Logger root = repository.getRootLogger();
      eh.setLogger(root);
    } else {
          quietParseUnrecognizedElement(eh, currentElement, props);
      }
  }
      }

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  /**
     Used internally to parse an {@link ErrorHandler} element.
   */
  protected
  void parseErrorHandler(Element element, Appender appender) {
    ErrorHandler eh = (ErrorHandler) OptionConverter.instantiateByClassName(
                                       subst(element.getAttribute(CLASS_ATTR)),
                                       org.apache.log4j.spi.ErrorHandler.class, 
                null);
    
    if(eh != null) {
      eh.setAppender(appender);


      PropertySetter propSetter = new PropertySetter(eh);
      NodeList children = element.getChildNodes();
      final int length   = children.getLength();


      for (int loop = 0; loop < length; loop++) {
  Node currentNode = children.item(loop);
  if (currentNode.getNodeType() == Node.ELEMENT_NODE) {
    Element currentElement = (Element) currentNode;
    String tagName = currentElement.getTagName();
    if(tagName.equals(PARAM_TAG)) {
            setParameter(currentElement, propSetter);
    } else if(tagName.equals(APPENDER_REF_TAG)) {
      eh.setBackupAppender(findAppenderByReference(currentElement));
    } else if(tagName.equals(LOGGER_REF)) {
      String loggerName = currentElement.getAttribute(REF_ATTR);      
      Logger logger = (catFactory == null) ? repository.getLogger(loggerName)
                : repository.getLogger(loggerName, catFactory);
      eh.setLogger(logger);
    } else if(tagName.equals(ROOT_REF)) {
      Logger root = repository.getRootLogger();
      eh.setLogger(root);
    } else {
          quietParseUnrecognizedElement(eh, currentElement, props);
      }
  }
      }

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  /**
     Used internally to parse an {@link ErrorHandler} element.
   */
  protected
  void parseErrorHandler(Element element, Appender appender) {
    ErrorHandler eh = (ErrorHandler) OptionConverter.instantiateByClassName(
                                       subst(element.getAttribute(CLASS_ATTR)),
                                       org.apache.log4j.spi.ErrorHandler.class, 
                null);
    
    if(eh != null) {
      eh.setAppender(appender);


      PropertySetter propSetter = new PropertySetter(eh);
      NodeList children = element.getChildNodes();
      final int length   = children.getLength();


      for (int loop = 0; loop < length; loop++) {
  Node currentNode = children.item(loop);
  if (currentNode.getNodeType() == Node.ELEMENT_NODE) {
    Element currentElement = (Element) currentNode;
    String tagName = currentElement.getTagName();
    if(tagName.equals(PARAM_TAG)) {
            setParameter(currentElement, propSetter);
    } else if(tagName.equals(APPENDER_REF_TAG)) {
      eh.setBackupAppender(findAppenderByReference(currentElement));
    } else if(tagName.equals(LOGGER_REF)) {
      String loggerName = currentElement.getAttribute(REF_ATTR);      
      Logger logger = (catFactory == null) ? repository.getLogger(loggerName)
                : repository.getLogger(loggerName, catFactory);
      eh.setLogger(logger);
    } else if(tagName.equals(ROOT_REF)) {
      Logger root = repository.getRootLogger();
      eh.setLogger(root);
    } else {
          quietParseUnrecognizedElement(eh, currentElement, props);
      }
  }
      }

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  }
      }
      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);

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/* 228 */     return null;
/*     */   }
/*     */ 
/*     */   protected void parseErrorHandler(Element element, Appender appender)
/*     */   {
/* 237 */     ErrorHandler eh = (ErrorHandler)OptionConverter.instantiateByClassName(subst(element.getAttribute("class")), ErrorHandler.class, null);
/*     */ 
/* 242 */     if (eh != null) {
/* 243 */       eh.setAppender(appender);
/*     */ 
/* 245 */       PropertySetter propSetter = new PropertySetter(eh);
/* 246 */       NodeList children = element.getChildNodes();
/* 247 */       int length = children.getLength();
/*     */ 
/* 249 */       for (int loop = 0; loop < length; loop++) {
/* 250 */         Node currentNode = children.item(loop);
/* 251 */         if (currentNode.getNodeType() == 1) {
/* 252 */           Element currentElement = (Element)currentNode;
/* 253 */           String tagName = currentElement.getTagName();
/* 254 */           if (tagName.equals("param")) {
/* 255 */             setParameter(currentElement, propSetter);
/* 256 */           } else if (tagName.equals("appender-ref")) {
/* 257 */             eh.setBackupAppender(findAppenderByReference(currentElement));
/* 258 */           } else if (tagName.equals("logger-ref")) {
/* 259 */             String loggerName = currentElement.getAttribute("ref");
/* 260 */             Logger logger = this.repository.getLogger(loggerName);
/* 261 */             eh.setLogger(logger);
/* 262 */           } else if (tagName.equals("root-ref")) {
/* 263 */             Logger root = this.repository.getRootLogger();
/* 264 */             eh.setLogger(root);
/*     */           }
/*     */         }
/*     */       }
/* 268 */       propSetter.activate();
/* 269 */       appender.setErrorHandler(eh);

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      }
      Object localObject = str1 + ".errorhandler";
      String str3 = OptionConverter.findAndSubst((String)localObject, paramProperties);
      if (str3 != null)
      {
        ErrorHandler localErrorHandler = (ErrorHandler)OptionConverter.instantiateByKey(paramProperties, (String)localObject, ErrorHandler.class, null);
        if (localErrorHandler != null)
        {
          localAppender.setErrorHandler(localErrorHandler);
          LogLog.debug("Parsing errorhandler options for \"" + paramString + "\".");
          parseErrorHandler(localErrorHandler, (String)localObject, paramProperties, this.repository);

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