Java Utililty Methods XML Namespace

XPathExpression compile(String expression, NamespaceContext namespaceContext)
Compiles an XPath expression for later evaluation.

return createXPath(namespaceContext, null).compile(expression);

NamespaceContext createNamespaceContext(final String nsPrefix, final String nsUri)
create Namespace Context

return new NamespaceContext() {
 public String getNamespaceURI(String prefix) {
 if (prefix.equals(nsPrefix)) {
 return nsUri;
 } else {
 return XMLConstants.NULL_NS_URI;
 public String getPrefix(String namespace) {
 if (namespace.equals(nsUri)) {
 return nsPrefix;
 } else {
 return null;
 public Iterator<String> getPrefixes(String namespace) {
 return null;
};

XMLReader createXMLReader(boolean validating, boolean namespaceAware)
This method attempts to use JAXP to locate the SAX2 XMLReader implementation.

SAXParserFactory factory = SAXParserFactory.newInstance();
factory.setValidating(validating);
factory.setNamespaceAware(namespaceAware);
SAXParser parser = factory.newSAXParser();
return parser.getXMLReader();

XMLReader createXMLReader(boolean validating, boolean withNamespace)
Create an XMLReader instance.

try {
 synchronized (parserFactory) {
 parserFactory.setValidating(validating);
 parserFactory.setNamespaceAware(withNamespace);
 return parserFactory.newSAXParser().getXMLReader();
} catch (ParserConfigurationException e) {
 throw new SAXException(e);
...

String getBaseNamespace(InputStream owlStream)
get Base Namespace

String base = "";
try {
 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
 factory.setNamespaceAware(true);
 DocumentBuilder builder = factory.newDocumentBuilder();
 Document doc = builder.parse(owlStream);
 Element root = doc.getDocumentElement();
 NamedNodeMap attributes = root.getAttributes();
...

DocumentBuilder getBuilder(boolean ignoreComments, boolean validating, boolean ignoreContentWhitespace, boolean isNamespaceAware)
get Builder

DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
factory.setIgnoringComments(ignoreComments);
factory.setValidating(validating);
factory.setIgnoringElementContentWhitespace(ignoreContentWhitespace);
factory.setNamespaceAware(isNamespaceAware);
DocumentBuilder builder = null;
try {
 builder = factory.newDocumentBuilder();
...

NamespaceContext getCarbonNamespace()
get Carbon Namespace

NamespaceContext ctx = new NamespaceContext() {
 public String getNamespaceURI(String prefix) {
 return "http://wso2.org/projects/carbon/carbon.xml";
 public String getPrefix(String arg0) {
 return null;
 public Iterator getPrefixes(String namespaceURI) {
...

String getDefaultNamespaceURI(final XMLStreamWriter writer)
get Default Namespace URI

return writer.getNamespaceContext().getNamespaceURI(XMLConstants.DEFAULT_NS_PREFIX);

DocumentBuilderFactory getFactory(boolean validate, boolean namespaceAware)
get Factory

DocumentBuilderFactory factory = doms[validate ? 0 : 1][namespaceAware ? 0 : 1];
if (factory == null) {
 factory = DocumentBuilderFactory.newInstance();
 factory.setValidating(validate);
 factory.setNamespaceAware(namespaceAware);
 doms[validate ? 0 : 1][namespaceAware ? 0 : 1] = factory;
return factory;
...

String getNamespace(Class clazz, String namespace)
get Namespace

if (namespace == null || namespace.trim().length() == 0) {
 Package pkg = clazz.getPackage();
 if (pkg == null) {
 return null;
 } else {
 return getNamespace(pkg.getName());
} else {
...