qname.java

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        if (prefix.equals("xml"))
        {
          _namespaceURI = S_XMLNAMESPACEURI;
        }
        
        // Do we want this?
        else if (prefix.equals("xmlns"))
        {
          return;
        }
        else
        {
          _namespaceURI = resolver.getNamespaceForPrefix(prefix,
                  namespaceContext);
        }

        if (null == _namespaceURI)
        {
          throw new RuntimeException(
            XMLMessages.createXMLMessage(
              XMLErrorResources.ER_PREFIX_MUST_RESOLVE,
              new Object[]{ prefix }));  //"Prefix must resolve to a namespace: "+prefix);
        }
      }
      else
      {

        // TODO: error or warning...
      }
    }

    _localName = (indexOfNSSep < 0)
                 ? qname : qname.substring(indexOfNSSep + 1);

    if (validate)
    {
        if ((_localName == null) || (!XML11Char.isXML11ValidNCName(_localName))) 
        {
           throw new IllegalArgumentException(XMLMessages.createXMLMessage(
            XMLErrorResources.ER_ARG_LOCALNAME_INVALID,null )); //"Argument 'localName' not a valid NCName");
        }
    }                 
                 
    m_hashCode = toString().hashCode();
  }


  /**
   * Construct a QName from a string, resolving the prefix
   * using the given namespace stack. The default namespace is
   * not resolved.
   *
   * @param qname Qualified name to resolve
   * @param resolver Prefix resolver for this context
   */
  public QName(String qname, PrefixResolver resolver)
  {
    this(qname, resolver, false);
  }

  /**
   * Construct a QName from a string, resolving the prefix
   * using the given namespace stack. The default namespace is
   * not resolved.
   *
   * @param qname Qualified name to resolve
   * @param resolver Prefix resolver for this context
   * @param validate If true the new QName will be validated and an IllegalArgumentException will
   *                 be thrown if it is invalid.
   */
  public QName(String qname, PrefixResolver resolver, boolean validate)
  {

	String prefix = null;
    _namespaceURI = null;

    int indexOfNSSep = qname.indexOf(':');

    if (indexOfNSSep > 0)
    {
      prefix = qname.substring(0, indexOfNSSep);

      if (prefix.equals("xml"))
      {
        _namespaceURI = S_XMLNAMESPACEURI;
      }
      else
      {
        _namespaceURI = resolver.getNamespaceForPrefix(prefix);
      }

      if (null == _namespaceURI)
      {
        throw new RuntimeException(
          XMLMessages.createXMLMessage(
            XMLErrorResources.ER_PREFIX_MUST_RESOLVE,
            new Object[]{ prefix }));  //"Prefix must resolve to a namespace: "+prefix);
      }
      _localName = qname.substring(indexOfNSSep + 1);
    }
    else if (indexOfNSSep == 0) 
    {
      throw new RuntimeException(
         XMLMessages.createXMLMessage(
           XMLErrorResources.ER_NAME_CANT_START_WITH_COLON,
           null));
    }
    else
    {
      _localName = qname;
    }   
                 
    if (validate)
    {
        if ((_localName == null) || (!XML11Char.isXML11ValidNCName(_localName))) 
        {
           throw new IllegalArgumentException(XMLMessages.createXMLMessage(
            XMLErrorResources.ER_ARG_LOCALNAME_INVALID,null )); //"Argument 'localName' not a valid NCName");
        }
    }                 

              
    m_hashCode = toString().hashCode();
    _prefix = prefix;
  }

  /**
   * Returns the namespace URI. Returns null if the namespace URI
   * is not known.
   *
   * @return The namespace URI, or null
   */
  public String getNamespaceURI()
  {
    return _namespaceURI;
  }

  /**
   * Returns the namespace prefix. Returns null if the namespace
   * prefix is not known.
   *
   * @return The namespace prefix, or null
   */
  public String getPrefix()
  {
    return _prefix;
  }

  /**
   * Returns the local part of the qualified name.
   *
   * @return The local part of the qualified name
   */
  public String getLocalName()
  {
    return _localName;
  }

  /**
   * Return the string representation of the qualified name, using the 
   * prefix if available, or the '{ns}foo' notation if not. Performs
   * string concatenation, so beware of performance issues.
   *
   * @return the string representation of the namespace
   */
  public String toString()
  {

    return _prefix != null
           ? (_prefix + ":" + _localName)
           : (_namespaceURI != null
              ? ("{"+_namespaceURI + "}" + _localName) : _localName);
  }
  
  /**
   * Return the string representation of the qualified name using the 
   * the '{ns}foo' notation. Performs
   * string concatenation, so beware of performance issues.
   *
   * @return the string representation of the namespace
   */
  public String toNamespacedString()
  {

    return (_namespaceURI != null
              ? ("{"+_namespaceURI + "}" + _localName) : _localName);
  }


  /**
   * Get the namespace of the qualified name.
   *
   * @return the namespace URI of the qualified name
   */
  public String getNamespace()
  {
    return getNamespaceURI();
  }

  /**
   * Get the local part of the qualified name.
   *
   * @return the local part of the qualified name
   */
  public String getLocalPart()
  {
    return getLocalName();
  }

  /**
   * Return the cached hashcode of the qualified name.
   *
   * @return the cached hashcode of the qualified name
   */
  public int hashCode()
  {
    return m_hashCode;
  }

  /**
   * Override equals and agree that we're equal if
   * the passed object is a string and it matches
   * the name of the arg.
   *
   * @param ns Namespace URI to compare to
   * @param localPart Local part of qualified name to compare to 
   *
   * @return True if the local name and uri match 
   */
  public boolean equals(String ns, String localPart)
  {

    String thisnamespace = getNamespaceURI();

    return getLocalName().equals(localPart)
           && (((null != thisnamespace) && (null != ns))
               ? thisnamespace.equals(ns)
               : ((null == thisnamespace) && (null == ns)));
  }

  /**
   * Override equals and agree that we're equal if
   * the passed object is a QName and it matches
   * the name of the arg.
   *
   * @return True if the qualified names are equal
   */
  public boolean equals(Object object)
  {

    if (object == this)
      return true;

    if (object instanceof QName) {
      QName qname = (QName) object;
      String thisnamespace = getNamespaceURI();
      String thatnamespace = qname.getNamespaceURI();

      return getLocalName().equals(qname.getLocalName())
             && (((null != thisnamespace) && (null != thatnamespace))
                 ? thisnamespace.equals(thatnamespace)
                 : ((null == thisnamespace) && (null == thatnamespace)));
    }
    else
      return false;
  }

  /**
   * Given a string, create and return a QName object  
   *
   *
   * @param name String to use to create QName
   *
   * @return a QName object
   */
  public static QName getQNameFromString(String name)
  {

    StringTokenizer tokenizer = new StringTokenizer(name, "{}", false);
    QName qname;
    String s1 = tokenizer.nextToken();
    String s2 = tokenizer.hasMoreTokens() ? tokenizer.nextToken() : null;

    if (null == s2)
      qname = new QName(null, s1);
    else
      qname = new QName(s1, s2);

    return qname;
  }

  /**
   * This function tells if a raw attribute name is a
   * xmlns attribute.
   *
   * @param attRawName Raw name of attribute
   *
   * @return True if the attribute starts with or is equal to xmlns 
   */
  public static boolean isXMLNSDecl(String attRawName)
  {

    return (attRawName.startsWith("xmlns")
            && (attRawName.equals("xmlns")
                || attRawName.startsWith("xmlns:")));
  }

  /**
   * This function tells if a raw attribute name is a
   * xmlns attribute.
   *
   * @param attRawName Raw name of attribute
   *
   * @return Prefix of attribute
   */
  public static String getPrefixFromXMLNSDecl(String attRawName)
  {

    int index = attRawName.indexOf(':');

    return (index >= 0) ? attRawName.substring(index + 1) : "";
  }

  /**
   * Returns the local name of the given node.
   *
   * @param qname Input name
   *
   * @return Local part of the name if prefixed, or the given name if not
   */
  public static String getLocalPart(String qname)
  {

    int index = qname.indexOf(':');

    return (index < 0) ? qname : qname.substring(index + 1);
  }

  /**
   * Returns the local name of the given node.
   *
   * @param qname Input name 
   *
   * @return Prefix of name or empty string if none there   
   */
  public static String getPrefixPart(String qname)
  {

    int index = qname.indexOf(':');

    return (index >= 0) ? qname.substring(0, index) : "";
  }
}