private Vector decodeEvents()

in src/main/java/org/apache/log4j/receivers/xml/XMLDecoder.java [303:465]
134 lines of code
26 McCabe index (conditional complexity)

  private Vector decodeEvents(final Document document) {
    Vector events = new Vector();

    Logger logger;
    long timeStamp;
    Level level;
    String threadName;
    Object message = null;
    String ndc = null;
    String[] exception = null;
    String className = null;
    String methodName = null;
    String fileName = null;
    String lineNumber = null;
    Hashtable properties = null;

    NodeList nl = document.getElementsByTagName("log4j:eventSet");
    Node eventSet = nl.item(0);

    NodeList eventList = eventSet.getChildNodes();

    for (int eventIndex = 0; eventIndex < eventList.getLength();
        eventIndex++) {
        Node eventNode = eventList.item(eventIndex);
      //ignore carriage returns in xml
        if (eventNode.getNodeType() != Node.ELEMENT_NODE) {
            continue;
        }
      logger = Logger.getLogger(eventNode.getAttributes().getNamedItem("logger").getNodeValue());
      timeStamp = Long.parseLong(eventNode.getAttributes().getNamedItem("timestamp").getNodeValue());
      level = Level.toLevel(eventNode.getAttributes().getNamedItem("level").getNodeValue());
      threadName = eventNode.getAttributes().getNamedItem("thread").getNodeValue();

      NodeList list = eventNode.getChildNodes();
      int listLength = list.getLength();

      if (listLength == 0) {
        continue;
      }

      for (int y = 0; y < listLength; y++) {
        String tagName = list.item(y).getNodeName();

        if (tagName.equalsIgnoreCase("log4j:message")) {
          message = getCData(list.item(y));
        }

        if (tagName.equalsIgnoreCase("log4j:NDC")) {
          ndc = getCData(list.item(y));
        }
        //still support receiving of MDC and convert to properties
        if (tagName.equalsIgnoreCase("log4j:MDC")) {
          properties = new Hashtable();
          NodeList propertyList = list.item(y).getChildNodes();
          int propertyLength = propertyList.getLength();

          for (int i = 0; i < propertyLength; i++) {
            String propertyTag = propertyList.item(i).getNodeName();

            if (propertyTag.equalsIgnoreCase("log4j:data")) {
              Node property = propertyList.item(i);
              String name =
                property.getAttributes().getNamedItem("name").getNodeValue();
              String value =
                property.getAttributes().getNamedItem("value").getNodeValue();
              properties.put(name, value);
            }
          }
        }

        if (tagName.equalsIgnoreCase("log4j:throwable")) {
            String exceptionString = getCData(list.item(y));
            if (exceptionString != null && !exceptionString.trim().equals("")) {
                exception = new String[] {exceptionString.trim()
            };
          }
        }

        if (tagName.equalsIgnoreCase("log4j:locationinfo")) {
          className =
            list.item(y).getAttributes().getNamedItem("class").getNodeValue();
          methodName =
            list.item(y).getAttributes().getNamedItem("method").getNodeValue();
          fileName =
            list.item(y).getAttributes().getNamedItem("file").getNodeValue();
          lineNumber =
            list.item(y).getAttributes().getNamedItem("line").getNodeValue();
        }

        if (tagName.equalsIgnoreCase("log4j:properties")) {
          if (properties == null) {
              properties = new Hashtable();
          }
          NodeList propertyList = list.item(y).getChildNodes();
          int propertyLength = propertyList.getLength();

          for (int i = 0; i < propertyLength; i++) {
            String propertyTag = propertyList.item(i).getNodeName();

            if (propertyTag.equalsIgnoreCase("log4j:data")) {
              Node property = propertyList.item(i);
              String name =
                property.getAttributes().getNamedItem("name").getNodeValue();
              String value =
                property.getAttributes().getNamedItem("value").getNodeValue();
              properties.put(name, value);
            }
          }
        }

          /**
           * We add all the additional properties to the properties
           * hashtable. Override properties that already exist
           */
          if (additionalProperties.size() > 0) {
              if (properties == null) {
                  properties = new Hashtable(additionalProperties);
              }
              Iterator i = additionalProperties.entrySet().iterator();
              while (i.hasNext()) {
                  Map.Entry e = (Map.Entry) i.next();
                  properties.put(e.getKey(), e.getValue());
              }
          }
      }

      LocationInfo info;
      if ((fileName != null)
              || (className != null)
              || (methodName != null)
              || (lineNumber != null)) {
          info = new LocationInfo(fileName, className, methodName, lineNumber);
      } else {
        info = LocationInfo.NA_LOCATION_INFO;
      }
      ThrowableInformation throwableInfo = null;
      if (exception != null) {
          throwableInfo = new ThrowableInformation(exception);
      }

        LoggingEvent loggingEvent = new LoggingEvent(null,
                logger, timeStamp, level, message,
                threadName,
                throwableInfo,
                ndc,
                info,
                properties);


      events.add(loggingEvent);

      message = null;
      ndc = null;
      exception = null;
      className = null;
      methodName = null;
      fileName = null;
      lineNumber = null;
      properties = null;
    }

    return events;
  }