How to use

getNamespacePrefix

method

in

javax.xml.crypto.XMLCryptoContext

/**
 * Returns the prefix associated with the specified namespace URI
 *
 * @param context contains the namespace map
 * @param nsURI the namespace URI
 * @return the prefix associated with the specified namespace URI, or
 *    null if not set
 */
public static String getNSPrefix(XMLCryptoContext context, String nsURI) {
  if (context != null) {
    return context.getNamespacePrefix
      (nsURI, context.getDefaultNamespacePrefix());
  } else {
    return null;
  }
}

String dsPrefix = null;
if (context != null) {
  prefix = context.getNamespacePrefix
      (WSSE, "wsse");
  dsPrefix = context.getNamespacePrefix
      (XMLSignature.XMLNS, context.getDefaultNamespacePrefix());