elementproxy.java

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      }
   }

   /**
    * Method setVal
    *
    * @param bi
    * @param localname
    */
   public void addBigIntegerElement(BigInteger bi, String localname) {

      if (bi != null) {
         Element e = XMLUtils.createElementInSignatureSpace(this._doc,
                        localname);

         Base64.fillElementWithBigInteger(e, bi);
         this._constructionElement.appendChild(e);
         XMLUtils.addReturnToElement(this._constructionElement);
      }
   }

   /**
    * Method addBase64Element
    *
    * @param bytes
    * @param localname
    */
   public void addBase64Element(byte[] bytes, String localname) {

      if (bytes != null) {

         Element e = Base64.encodeToElement(this._doc, localname, bytes);

         this._constructionElement.appendChild(e);
         this._constructionElement.appendChild(this._doc.createTextNode("\n"));
      }
   }

   /**
    * Method addTextElement
    *
    * @param text
    * @param localname
    */
   public void addTextElement(String text, String localname) {

      Element e = XMLUtils.createElementInSignatureSpace(this._doc, localname);
      Text t = this._doc.createTextNode(text);

      e.appendChild(t);
      this._constructionElement.appendChild(e);
      XMLUtils.addReturnToElement(this._constructionElement);
   }

   /**
    * Method addBase64Text
    *
    * @param bytes
    */
   public void addBase64Text(byte[] bytes) {

      if (bytes != null) {
         Text t = this._doc.createTextNode("\n" + Base64.encode(bytes) + "\n");

         this._constructionElement.appendChild(t);
      }
   }

   /**
    * Method addText
    *
    * @param text
    */
   public void addText(String text) {

      if (text != null) {
         Text t = this._doc.createTextNode(text);

         this._constructionElement.appendChild(t);
      }
   }

   /**
    * Method getVal
    *
    * @param localname
    * @param namespace
    * @return The biginter contained in the given element
 * @throws Base64DecodingException
    */
   public BigInteger getBigIntegerFromChildElement(
           String localname, String namespace) throws Base64DecodingException {
   	    
   		return Base64.decodeBigIntegerFromText(
   				XMLUtils.selectNodeText(this._constructionElement.getFirstChild(),
   						namespace,localname,0));

   }

   /**
    * Method getBytesFromChildElement
    *
    * @param localname
    * @param namespace
    * @return the bytes
    * @throws XMLSecurityException
    */
   public byte[] getBytesFromChildElement(String localname, String namespace)
           throws XMLSecurityException {
               
         Element e =
             XMLUtils.selectNode(
                 this._constructionElement.getFirstChild(),
                 namespace,
                 localname,
                 0);
            
         return Base64.decode(e);
   }

   /**
    * Method getTextFromChildElement
    *
    * @param localname
    * @param namespace
    * @return the Text of the textNode
    */
   public String getTextFromChildElement(String localname, String namespace) {
              
         Text t =
             (Text) XMLUtils.selectNode(
                        this._constructionElement.getFirstChild(),
                        namespace,
                        localname,
                        0).getFirstChild();

         return t.getData();      
   }

   /**
    * Method getBytesFromTextChild
    *
    * @return The base64 bytes from the first text child of this element
    * @throws XMLSecurityException
    */
   public byte[] getBytesFromTextChild() throws XMLSecurityException {
      
         Text t = (Text)this._constructionElement.getFirstChild();
                                                   

         return Base64.decode(t.getData());
   }

   /**
    * Method getTextFromTextChild
    *
    * @return the Text obtained concatening all the the text nodes of this element
    */
   public String getTextFromTextChild() {
      return XMLUtils.getFullTextChildrenFromElement(this._constructionElement);
   }

  

   /**
    * Method length
    *
    * @param namespace
    * @param localname
    * @return the number of elements {namespace}:localname under this element
    */
   public int length(String namespace, String localname) {
   	    int number=0;
   	    Node sibling=this._constructionElement.getFirstChild();
   	    while (sibling!=null) {        
   	    	if (localname.equals(sibling.getLocalName())
   	    			&&  
					namespace.equals(sibling.getNamespaceURI())) {            
   	    		number++;
   	    	}
   	    	sibling=sibling.getNextSibling();
   	    }
   	    return number;
     }

   /**
    * Adds an xmlns: definition to the Element. This can be called as follows:
    *
    * <PRE>
    * // set namespace with ds prefix
    * xpathContainer.setXPathNamespaceContext("ds", "http://www.w3.org/2000/09/xmldsig#");
    * xpathContainer.setXPathNamespaceContext("xmlns:ds", "http://www.w3.org/2000/09/xmldsig#");
    * </PRE>
    *
    * @param prefix
    * @param uri
    * @throws XMLSecurityException
    */
   public void setXPathNamespaceContext(String prefix, String uri)
           throws XMLSecurityException {

      String ns;

      if ((prefix == null) || (prefix.length() == 0)) {
       throw new XMLSecurityException("defaultNamespaceCannotBeSetHere");
      } else if (prefix.equals("xmlns")) {
        throw new XMLSecurityException("defaultNamespaceCannotBeSetHere");
      } else if (prefix.startsWith("xmlns:")) {
         ns = prefix;//"xmlns:" + prefix.substring("xmlns:".length());
      } else {
         ns = "xmlns:" + prefix;
      }

      

      Attr a = this._constructionElement.getAttributeNodeNS(Constants.NamespaceSpecNS, ns);

      if (a != null) { 
       if (!a.getNodeValue().equals(uri)) {
         Object exArgs[] = { ns,
                             this._constructionElement.getAttributeNS(null,
                                                                      ns) };

         throw new XMLSecurityException("namespacePrefixAlreadyUsedByOtherURI",
                                        exArgs);
       }
       return;
      }

      this._constructionElement.setAttributeNS(Constants.NamespaceSpecNS, ns,
                                               uri);
   }

   /** Field _prefixMappings */
   static HashMap _prefixMappings = new HashMap();

   /**
    * Method setDefaultPrefix
    *
    * @param namespace
    * @param prefix
    * @throws XMLSecurityException
    */
   public static void setDefaultPrefix(String namespace, String prefix)
           throws XMLSecurityException {
    
   	if (ElementProxy._prefixMappings.containsValue(prefix)) {
        
   		Object storedNamespace=ElementProxy._prefixMappings.get(namespace);
         if (!storedNamespace.equals(prefix)) {
         	Object exArgs[] = { prefix, namespace, storedNamespace };

         	throw new XMLSecurityException("prefix.AlreadyAssigned", exArgs);
         }
    }
      ElementProxy._prefixMappings.put(namespace, prefix);
   }

   /**
    * Method getDefaultPrefix
    *
    * @param namespace
    * @return the default prefix bind to this element.
    */
   public static String getDefaultPrefix(String namespace) {

      String prefix = (String) ElementProxy._prefixMappings.get(namespace);

      return prefix;
   }
}