Examples of org.pdf4j.saxon.xpath.XPathEvaluator

org.pdf4j.saxon.xpath.XPathEvaluator

XPathEvaluator provides a simple API for standalone XPath processing (that is, executing XPath expressions in the absence of an XSLT stylesheet). It is an implementation of the JAXP 1.3 XPath interface, with additional methods provided (a) for backwards compatibility (b) to give extra control over the XPath evaluation, and (c) to support XPath 2.0.

It is intended to evolve this so that it only supports the JAXP style of operation. Some of the methods are therefore marked as deprecated in this release, and will be dropped in a future release.

For an alternative XPath API, offering more direct access to Saxon capabilities, see {@link org.pdf4j.saxon.sxpath.XPathEvaluator}.

Note that the XPathEvaluator links to a Saxon {@link Configuration}object. By default a new Configuration is created automatically. In many applications, however, it is desirable to share a configuration. The default configuration is not schema aware. All source documents used by XPath expressions under this evaluator must themselves be built using the Configuration used by this evaluator.

@author Michael H. Kay

    public static void main (String[] args) throws Exception {
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        factory.setNamespaceAware(true);
        DocumentBuilder db = factory.newDocumentBuilder();
        Document doc = db.newDocument();
        XPathEvaluator xpe = new XPathEvaluator();
        String exp = "ext:sortArrayToNodeList(('fred', 'jane', 'anne', 'sue'))";
        xpe.setNamespaceContext(new NamespaceContext() {
            public String getNamespaceURI(String prefix) {
                return (prefix.equals("ext") ? "java:org.orbeon.saxon.dom.DOMObjectModel" : null);
            }
            public String getPrefix(String namespaceURI) {
                return null;
            }
            public Iterator getPrefixes(String namespaceURI) {
                return null;
            }
        });
        NodeList isList = (NodeList)xpe.evaluate(exp, doc, XPathConstants.NODESET);
        System.err.println("length " + isList.getLength());
    }

Examples of org.pdf4j.saxon.xpath.XPathEvaluator

Related Classes of org.pdf4j.saxon.xpath.XPathEvaluator