/**
   * Reads the SOAP fault.
   *
   * @param reader The reader.
   * @return SOAP fault details.
   */
  private SoapFaultDetails readSoapFault(EwsXmlReader reader) {
    SoapFaultDetails soapFaultDetails = null;

    try {

      reader.read();
      if (reader.getNodeType().getNodeType() == XmlNodeType.START_DOCUMENT) {
        reader.read();
      }
      if (!reader.isStartElement()
          || (!reader.getLocalName().equals(XmlElementNames.SOAPEnvelopeElementName))) {
        return null;
      }

      // Get the namespace URI from the envelope element and use it for
      // the rest of the parsing.
      // If it's not 1.1 or 1.2, we can't continue.
      XmlNamespace soapNamespace = EwsUtilities.getNamespaceFromUri(reader.getNamespaceUri());
      if (soapNamespace == XmlNamespace.NotSpecified) {
        return null;
      }

      reader.read();

      // Skip SOAP header.
      if (reader.isStartElement(soapNamespace, XmlElementNames.SOAPHeaderElementName)) {
        do {
          reader.read();
        } while (!reader.isEndElement(soapNamespace, XmlElementNames.SOAPHeaderElementName));

        // Queue up the next read
        reader.read();
      }

      // Parse the fault element contained within the SOAP body.
      if (reader.isStartElement(soapNamespace, XmlElementNames.SOAPBodyElementName)) {
        do {
          reader.read();

          // Parse Fault element
          if (reader.isStartElement(soapNamespace, XmlElementNames.SOAPFaultElementName)) {
            soapFaultDetails = SoapFaultDetails.parse(reader, soapNamespace);
          }
        } while (!reader.isEndElement(soapNamespace, XmlElementNames.SOAPBodyElementName));
      }

      reader.readEndElement(soapNamespace, XmlElementNames.SOAPEnvelopeElementName);
    } catch (Exception e) {
      // If response doesn't contain a valid SOAP fault, just ignore
      // exception and
      // return null for SOAP fault details.
      e.printStackTrace();
    }

    return soapFaultDetails;
  }
  /**
   * Parses the message xml.
   *
   * @param reader the reader
   * @throws Exception the exception
   * @throws ServiceXmlDeserializationException the service xml deserialization exception
   */
  private void parseMessageXml(EwsXmlReader reader)
      throws Exception, ServiceXmlDeserializationException, Exception {
    // E14:172881: E12 and E14 return the MessageXml element in different
    // namespaces (types namespace for E12, errors namespace in E14). To
    // avoid this problem, the parser will match the namespace from the
    // start and end elements.
    XmlNamespace elementNS = EwsUtilities.getNamespaceFromUri(reader.getNamespaceUri());

    if (!reader.isEmptyElement()) {
      do {
        reader.read();

        if (reader.isStartElement() && !reader.isEmptyElement()) {
          String localName = reader.getLocalName();
          if (localName.equals(XmlElementNames.Value)) {
            this.errorDetails.put(
                reader.readAttributeValue(XmlAttributeNames.Name), reader.readElementValue());
          }
        }
      } while (!reader.isEndElement(elementNS, XmlElementNames.MessageXml));
    } else {
      reader.read();
    }
  }