/**
   * * 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 soapFaultDetails;
      }

      // 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 soapFaultDetails;
      }

      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;
  }
  /**
   * * Read SOAP header.
   *
   * @param reader EwsXmlReader.
   * @throws Exception the exception
   */
  protected void readSoapHeader(EwsXmlReader reader) throws Exception {
    reader.readStartElement(XmlNamespace.Soap, XmlElementNames.SOAPHeaderElementName);
    do {
      reader.read();

      // Is this the ServerVersionInfo?
      if (reader.isStartElement(XmlNamespace.Autodiscover, XmlElementNames.ServerVersionInfo)) {
        this.service.setServerInfo(this.readServerVersionInfo(reader));
      }
    } while (!reader.isEndElement(XmlNamespace.Soap, XmlElementNames.SOAPHeaderElementName));
  }
  /**
   * * Read ServerVersionInfo SOAP header.
   *
   * @param reader EwsXmlReader.
   * @return ExchangeServerInfo ExchangeServerInfo object
   * @throws Exception the exception
   */
  private ExchangeServerInfo readServerVersionInfo(EwsXmlReader reader) throws Exception {
    ExchangeServerInfo serverInfo = new ExchangeServerInfo();
    do {
      reader.read();

      if (reader.isStartElement()) {
        if (reader.getLocalName().equals(XmlElementNames.MajorVersion)) {
          serverInfo.setMajorVersion(reader.readElementValue(Integer.class));
        } else if (reader.getLocalName().equals(XmlElementNames.MinorVersion)) {
          serverInfo.setMinorVersion(reader.readElementValue(Integer.class));
        } else if (reader.getLocalName().equals(XmlElementNames.MajorBuildNumber)) {
          serverInfo.setMajorBuildNumber(reader.readElementValue(Integer.class));
        } else if (reader.getLocalName().equals(XmlElementNames.MinorBuildNumber)) {
          serverInfo.setMinorBuildNumber(reader.readElementValue(Integer.class));
        } else if (reader.getLocalName().equals(XmlElementNames.Version)) {
          serverInfo.setVersionString(reader.readElementValue());
        }
      }
    } while (!reader.isEndElement(XmlNamespace.Autodiscover, XmlElementNames.ServerVersionInfo));

    return serverInfo;
  }