Java Utililty Methods XPath Expression

List of utility methods to do XPath Expression

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Description

The list of methods to do XPath Expression are organized into topic(s).

Method

XPathExpressionexpr(String xpathStr)
expr 
XPath xpath = factory.newXPath();
return xpath.compile(xpathStr);
StringextractNode(XPath xpath, String nodePath, String xmlString)
Extract a String node from an XML Message 
InputSource inputSource = new InputSource(new StringReader(xmlString));
try {
    return (String) xpath.evaluate(nodePath, inputSource, XPathConstants.STRING);
} catch (XPathExpressionException e) {
    return "";
NodeListextractNodeList(XPath xpath, String nodePath, String xmlString)
extract Node List 
InputSource inputSource = new InputSource(new StringReader(xmlString));
try {
    return (NodeList) xpath.evaluate(nodePath, inputSource, XPathConstants.NODESET);
} catch (XPathExpressionException e) {
    return null;
NodeListextractNodes(File xmlFile, String xpathLocator)
extract Nodes 
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document doc = builder.parse(xmlFile);
XPathFactory xPathfactory = XPathFactory.newInstance();
XPath xpath = xPathfactory.newXPath();
XPathExpression expr = xpath.compile(xpathLocator);
return (NodeList) expr.evaluate(doc, XPathConstants.NODESET);
StringextractValue(String xml, String xpathExpression)
extract Value 
String actual;
try {
    DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
    documentBuilderFactory.setNamespaceAware(true);
    documentBuilderFactory.setIgnoringElementContentWhitespace(true);
    DocumentBuilder docBuilder = documentBuilderFactory.newDocumentBuilder();
    byte[] bytes = xml.getBytes("UTF-8");
    InputStream inputStream = new ByteArrayInputStream(bytes);
...
ListfindElements(final String xPathExpression, final Element root)
Checks in under a given root element whether it can find a child elements which match the XPath expression supplied. 
final List<Element> elements = new ArrayList<Element>();
NodeList nodes = null;
try {
    XPathExpression expr = COMPILED_EXPRESSION_CACHE.get(xPathExpression);
    if (expr == null) {
        expr = XPATH.compile(xPathExpression);
        COMPILED_EXPRESSION_CACHE.put(xPathExpression, expr);
    nodes = (NodeList) expr.evaluate(root, XPathConstants.NODESET);
} catch (final XPathExpressionException e) {
    throw new IllegalArgumentException("Unable evaluate xpath expression", e);
for (int i = 0, n = nodes.getLength(); i < n; i++) {
    elements.add((Element) nodes.item(i));
return elements;
booleanhasAnimatedPng(ImageReader reader)
has Animated Png 
if (!"png".equals(reader.getFormatName())) {
    return false;
try {
    IIOMetadata metadata = reader.getImageMetadata(0);
    XPath xPath = XPathFactory.newInstance().newXPath();
    for (String name : metadata.getMetadataFormatNames()) {
        Node root = metadata.getAsTree(name);
...
voidisLegalXPath(final String xPath)
is Legal X Path 
XPathFactory factory = XPathFactory.newInstance();
XPath xpath = factory.newXPath();
xpath.compile(xPath);
booleanisValidFilter(String xPathString)
is Valid Filter 
if (xPathString == null) {
    return true;
try {
    XPath xPath = xPathFactory.newXPath();
    xPath.compile(xPathString);
    return true;
} catch (XPathExpressionException ex) {
...
booleanisXPathAbsolute(String path)
is X Path Absolute 
validateXPath(path);
return path.matches(REGEX_PATH_ABS);