public String getNamespaceOfNode()

in src/org/apache/xml/utils/DOMHelper.java [614:810]
163 lines of code
40 McCabe index (conditional complexity)

  public String getNamespaceOfNode(Node n)
  {

    String namespaceOfPrefix;
    boolean hasProcessedNS;
    NSInfo nsInfo;
    short ntype = n.getNodeType();

    if (Node.ATTRIBUTE_NODE != ntype)
    {
      Object nsObj = m_NSInfos.get(n);  // return value

      nsInfo = (nsObj == null) ? null : (NSInfo) nsObj;
      hasProcessedNS = (nsInfo == null) ? false : nsInfo.m_hasProcessedNS;
    }
    else
    {
      hasProcessedNS = false;
      nsInfo = null;
    }

    if (hasProcessedNS)
    {
      namespaceOfPrefix = nsInfo.m_namespace;
    }
    else
    {
      namespaceOfPrefix = null;

      String nodeName = n.getNodeName();
      int indexOfNSSep = nodeName.indexOf(':');
      String prefix;

      if (Node.ATTRIBUTE_NODE == ntype)
      {
        if (indexOfNSSep > 0)
        {
          prefix = nodeName.substring(0, indexOfNSSep);
        }
        else
        {

          // Attributes don't use the default namespace, so if 
          // there isn't a prefix, we're done.
          return namespaceOfPrefix;
        }
      }
      else
      {
        prefix = (indexOfNSSep >= 0)
                 ? nodeName.substring(0, indexOfNSSep) : "";
      }

      boolean ancestorsHaveXMLNS = false;
      boolean nHasXMLNS = false;

      if (prefix.equals("xml"))
      {
        namespaceOfPrefix = QName.S_XMLNAMESPACEURI;
      }
      else
      {
        int parentType;
        Node parent = n;

        while ((null != parent) && (null == namespaceOfPrefix))
        {
          if ((null != nsInfo)
                  && (nsInfo.m_ancestorHasXMLNSAttrs
                      == NSInfo.ANCESTORNOXMLNS))
          {
            break;
          }

          parentType = parent.getNodeType();

          if ((null == nsInfo) || nsInfo.m_hasXMLNSAttrs)
          {
            boolean elementHasXMLNS = false;

            if (parentType == Node.ELEMENT_NODE)
            {
              NamedNodeMap nnm = parent.getAttributes();

              for (int i = 0; i < nnm.getLength(); i++)
              {
                Node attr = nnm.item(i);
                String aname = attr.getNodeName();

                if (aname.charAt(0) == 'x')
                {
                  boolean isPrefix = aname.startsWith("xmlns:");

                  if (aname.equals("xmlns") || isPrefix)
                  {
                    if (n == parent)
                      nHasXMLNS = true;

                    elementHasXMLNS = true;
                    ancestorsHaveXMLNS = true;

                    String p = isPrefix ? aname.substring(6) : "";

                    if (p.equals(prefix))
                    {
                      namespaceOfPrefix = attr.getNodeValue();

                      break;
                    }
                  }
                }
              }
            }

            if ((Node.ATTRIBUTE_NODE != parentType) && (null == nsInfo)
                    && (n != parent))
            {
              nsInfo = elementHasXMLNS
                       ? m_NSInfoUnProcWithXMLNS : m_NSInfoUnProcWithoutXMLNS;

              m_NSInfos.put(parent, nsInfo);
            }
          }

          if (Node.ATTRIBUTE_NODE == parentType)
          {
            parent = getParentOfNode(parent);
          }
          else
          {
            m_candidateNoAncestorXMLNS.addElement(parent);
            m_candidateNoAncestorXMLNS.addElement(nsInfo);

            parent = parent.getParentNode();
          }

          if (null != parent)
          {
            Object nsObj = m_NSInfos.get(parent);  // return value

            nsInfo = (nsObj == null) ? null : (NSInfo) nsObj;
          }
        }

        int nCandidates = m_candidateNoAncestorXMLNS.size();

        if (nCandidates > 0)
        {
          if ((false == ancestorsHaveXMLNS) && (null == parent))
          {
            for (int i = 0; i < nCandidates; i += 2)
            {
              Object candidateInfo = m_candidateNoAncestorXMLNS.elementAt(i
                                       + 1);

              if (candidateInfo == m_NSInfoUnProcWithoutXMLNS)
              {
                m_NSInfos.put(m_candidateNoAncestorXMLNS.elementAt(i),
                              m_NSInfoUnProcNoAncestorXMLNS);
              }
              else if (candidateInfo == m_NSInfoNullWithoutXMLNS)
              {
                m_NSInfos.put(m_candidateNoAncestorXMLNS.elementAt(i),
                              m_NSInfoNullNoAncestorXMLNS);
              }
            }
          }

          m_candidateNoAncestorXMLNS.removeAllElements();
        }
      }

      if (Node.ATTRIBUTE_NODE != ntype)
      {
        if (null == namespaceOfPrefix)
        {
          if (ancestorsHaveXMLNS)
          {
            if (nHasXMLNS)
              m_NSInfos.put(n, m_NSInfoNullWithXMLNS);
            else
              m_NSInfos.put(n, m_NSInfoNullWithoutXMLNS);
          }
          else
          {
            m_NSInfos.put(n, m_NSInfoNullNoAncestorXMLNS);
          }
        }
        else
        {
          m_NSInfos.put(n, new NSInfo(namespaceOfPrefix, nHasXMLNS));
        }
      }
    }

    return namespaceOfPrefix;
  }