Java Utililty Methods XML QName Parse

QName parseQName(String qname, Element namespaceContext)
Parses the given String into a QName object and resolves the prefix to a namespace URI.

int colonIndex = qname.indexOf(':');
String prefix = null;
if (colonIndex >= 0)
 prefix = qname.substring(0, colonIndex);
String localName = qname.substring(colonIndex + 1);
String uri = null;
if (namespaceContext != null)
 uri = resolveNamespace(qname, namespaceContext);
...

QName parseQName(URI u)
Converts a URI into a QName, based entirely on parsing.

String s = u.toString();
for (int i = s.length() - 1; i > 0; i--) {
 if (!localNameChar(s.charAt(i))) {
 for (int p = i + 1; p < s.length(); p++) {
 if (localStartNameChar(s.charAt(p)))
 return new QName(s.substring(0, p), s.substring(p));
 return new QName(s);
...

QName parseQNameString(String qNameString)
Parse the given qualified name string into a QName.

Assert.hasLength(qNameString, "QName text may not be null or empty");
if (qNameString.charAt(0) != '{') {
 return new QName(qNameString);
} else {
 int endOfNamespaceURI = qNameString.indexOf('}');
 if (endOfNamespaceURI == -1) {
 throw new IllegalArgumentException(
 "Cannot create QName from \"" + qNameString + "\", missing closing \"}\"");
...

QName parseQNameString(String qns)
parse Q Name String

if (qns != null) {
 Matcher m = QNAME_PAT.matcher(qns);
 if (m.matches() && m.group(4) != null) {
 return new QName(m.group(3), m.group(5), m.group(4));
 } else {
 return new QName(qns);
} else {
...