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

PropertiesloadFromXmlNode(String xmlFile, String prefix)
load From Xml Node 
XPath xpath = XPathFactory.newInstance().newXPath();
InputSource source = new InputSource(xmlFile);
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
Document doc = db.parse(source);
XPathExpression expr = xpath.compile(prefix + "/*");
NodeList list = (NodeList) expr.evaluate(doc, XPathConstants.NODESET);
Properties props = new Properties();
...
NodeListloadNodeList(String file, String path)
load Node List 
try {
    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    DocumentBuilder builder;
    builder = factory.newDocumentBuilder();
    Document doc = builder.parse(file);
    return getDocNodeList(doc, path);
} catch (ParserConfigurationException e) {
    e.printStackTrace();
...
Documentmerge(XPathExpression expression, InputStream... files)
merge 
DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();
docBuilderFactory.setIgnoringElementContentWhitespace(true);
DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder();
Document base = docBuilder.parse(files[0]);
Node results = (Node) expression.evaluate(base, XPathConstants.NODE);
if (results == null) {
    throw new IOException(files[0] + ": expression does not evaluate to node");
for (int i = 1; i < files.length; i++) {
    Document merge = docBuilder.parse(files[i]);
    Node nextResults = (Node) expression.evaluate(merge, XPathConstants.NODE);
    while (nextResults.hasChildNodes()) {
        Node kid = nextResults.getFirstChild();
        nextResults.removeChild(kid);
        kid = base.importNode(kid, true);
        results.appendChild(kid);
return base;
XPathExpressionmodelPathExpr()
Constructs XPath for disecting model path 
XPathExpression pathExpr = fact.newXPath().compile("//arr[@name='model_path']/str");
return pathExpr;
StringparseXMLValue(String xml, String xpathExpression)
parse XML Value 
try (InputStream is = new ByteArrayInputStream(xml.getBytes(StandardCharsets.UTF_8.name()))) {
    XPath xpath = XPathFactory.newInstance().newXPath();
    InputSource inputSource = new InputSource(is);
    xpath.setNamespaceContext(ihcNamespaceContext);
    return (String) xpath.evaluate(xpathExpression, inputSource, XPathConstants.STRING);
XPathExpressionparseXPath(String expression, NamespaceContext nsContext)
parse X Path 
XPath xpath = XPATH_FACTORY.newXPath();
xpath.setNamespaceContext(nsContext);
return xpath.compile(expression);
booleanpathExists(XPath xpath, String expression, Object object)
Convenience method that performs an xpath evaluation to determine whether the expression evaluates to true (a node exists). 
return ((Boolean) xpath.evaluate(expression, object, XPathConstants.BOOLEAN)).booleanValue();
StringreadXmlNodeChildFromFile(String xPath, String path, NamespaceContext nsContext)
read Xml Node Child From File 
synchronized (path.intern()) {
    File f = new File(path);
    DocumentBuilderFactory xmlFact = DocumentBuilderFactory.newInstance();
    xmlFact.setNamespaceAware(nsContext != null);
    try {
        DocumentBuilder builder = xmlFact.newDocumentBuilder();
        Document doc = builder.parse(f);
        XPath xpath = XPathFactory.newInstance().newXPath();
...
voidreplaceXPathNode(Node replaceThis, Node replaceWith)
replace X Path Node 
Node parentNode = replaceThis.getParentNode();
parentNode.insertBefore(replaceWith, replaceThis);
parentNode.removeChild(replaceThis);
NodesingleXPathNode(String expression, Node node)
single X Path Node 
XPath xp = XPathFactory.newInstance().newXPath();
return (Node) xp.evaluate(expression, node, XPathConstants.NODE);