Examples of net.sf.saxon.xpath.XPathEvaluator

net.sf.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 net.sf.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

            net.sf.saxon.xpath.XPathFactoryImpl xpf = new net.sf.saxon.xpath.XPathFactoryImpl();


            OXPath20ExpressionBPEL20 oxpath20 = ((OXPath20ExpressionBPEL20) cexp);
            xpf.setXPathFunctionResolver(new JaxpFunctionResolver(ctx, oxpath20));
            xpf.setXPathVariableResolver(new JaxpVariableResolver(ctx, oxpath20));
            XPathEvaluator xpe = (XPathEvaluator) xpf.newXPath();
            xpe.setNamespaceContext(oxpath20.namespaceCtx);
            // Just checking that the expression is valid
            XPathExpression expr = xpe.compile(((OXPath10Expression)cexp).xpath);


            Object evalResult = expr.evaluate(ctx.getRootNode() == null ? DOMUtils.newDocument() : ctx.getRootNode(), type);
            if (evalResult != null && __log.isDebugEnabled()) {
                __log.debug("Expression " + cexp.toString() + " generated result " + evalResult
                        + " - type=" + evalResult.getClass().getName());

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            net.sf.saxon.xpath.XPathFactoryImpl xpf = new net.sf.saxon.xpath.XPathFactoryImpl();


            OXPath20ExpressionBPEL20 oxpath20 = ((OXPath20ExpressionBPEL20) cexp);
            xpf.setXPathFunctionResolver(new JaxpFunctionResolver(ctx, oxpath20));
            xpf.setXPathVariableResolver(new JaxpVariableResolver(ctx, oxpath20));
            XPathEvaluator xpe = (XPathEvaluator) xpf.newXPath();
            xpe.setNamespaceContext(oxpath20.namespaceCtx);
            // Just checking that the expression is valid
            XPathExpression expr = xpe.compile(((OXPath10Expression)cexp).xpath);


            Object evalResult = expr.evaluate(ctx.getRootNode() == null ? DOMUtils.newDocument() : ctx.getRootNode(), type);
            if (evalResult != null && __log.isDebugEnabled()) {
                __log.debug("Expression " + cexp.toString() + " generated result " + evalResult
                        + " - type=" + evalResult.getClass().getName());

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                    _compilerContext, out, source.getNamespaceContext(), _bpelNS);
            xpf.setXPathFunctionResolver(funcResolver);
            JaxpVariableResolver varResolver = new JaxpVariableResolver(_compilerContext, out);
            xpf.setXPathVariableResolver(varResolver);


            XPathEvaluator xpe = (XPathEvaluator) xpf.newXPath();
            xpe.setStaticContext(new SaxonContext(xpf.getConfiguration(), varResolver, funcResolver));
            xpe.setXPathFunctionResolver(funcResolver);
            xpe.setNamespaceContext(source.getNamespaceContext());
            xpe.compile(xpathStr);
        } catch (XPathExpressionException e) {
            __log.debug(e);
            __log.info("Couldn't validate properly expression " + xpathStr);
        } catch (WrappedResolverException wre) {
            if (wre._compilationMsg != null)

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            net.sf.saxon.xpath.XPathFactoryImpl xpf = new net.sf.saxon.xpath.XPathFactoryImpl();


            OXPath20ExpressionBPEL20 oxpath20 = ((OXPath20ExpressionBPEL20) cexp);
            xpf.setXPathFunctionResolver(new JaxpFunctionResolver(ctx, oxpath20));
            xpf.setXPathVariableResolver(new JaxpVariableResolver(ctx, oxpath20));
            XPathEvaluator xpe = (XPathEvaluator) xpf.newXPath();
            xpe.setNamespaceContext(oxpath20.namespaceCtx);
            // Just checking that the expression is valid
            XPathExpression expr = xpe.compile(((OXPath10Expression)cexp).xpath);


            Object evalResult = expr.evaluate(ctx.getRootNode() == null ? DOMUtils.newDocument() : ctx.getRootNode(), type);
            if (evalResult != null && __log.isDebugEnabled()) {
                __log.debug("Expression " + cexp.toString() + " generated result " + evalResult
                        + " - type=" + evalResult.getClass().getName());

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        // Give it a Saxon wrapper
        DocumentWrapper docw =
                new DocumentWrapper(doc, sourceID, config);


        // Retrieve all the ITEM elements
        XPathEvaluator xpath = new XPathEvaluator(config);
        XPathExpression exp = xpath.compile("//ITEM");
        List list = (List)exp.evaluate(docw, XPathConstants.NODESET);


        // For each of these, compute an additional attribute


        for (Iterator iter=list.iterator(); iter.hasNext();) {

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            // the actual query and serialization.
            System.out.println("Loading classes, parsing " + filename + ", and setting up serializer");


            Object document = null;
            if (objectModel.equals(NamespaceConstant.OBJECT_MODEL_SAXON)) {
                document = new XPathEvaluator().setSource(new StreamSource(new File(filename)));


            } else if (objectModel.equals(XPathConstants.DOM_OBJECT_MODEL)) {
                InputSource in = new InputSource(new FileInputStream(filename));
                DocumentBuilderFactory dfactory = DocumentBuilderFactory.newInstance();
                dfactory.setNamespaceAware(true);

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            throws TransformerException {


        TransformerFactory tfactory = TransformerFactory.newInstance();
        Templates templates = tfactory.newTemplates(new StreamSource(xslID));
        Transformer transformer = templates.newTransformer();
        XPathEvaluator xpath = new XPathEvaluator(((TransformerFactoryImpl)tfactory).getConfiguration());
        DocumentInfo doc = (DocumentInfo)xpath.setSource(new SAXSource(new InputSource(sourceID)));
        transformer.transform(doc, new StreamResult(System.out));
    }

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            DocumentBuilder docBuilder = dfactory.newDocumentBuilder();
            System.err.println("Using DocumentBuilder " + docBuilder.getClass());


            Document doc = docBuilder.newDocument();


            XPathEvaluator xpath = new XPathEvaluator(((TransformerFactoryImpl)tfactory).getConfiguration());
            DocumentInfo saxonDoc = (DocumentInfo)xpath.setSource(new SAXSource(new InputSource(sourceID)));
            NodeInfo top = (NodeInfo)saxonDoc.iterateAxis(Axis.CHILD, NodeKindTest.ELEMENT).next();


            Node imported = doc.importNode(NodeOverNodeInfo.wrap(top), true);


            // Serialize the output so we can see the import actually worked

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    public List selectNodes(Object node)
    {
        try
        {
            DOMSource rootNode =new DOMSource((Node) node);
            XPathEvaluator xpe = new XPathEvaluator();
            NodeInfo _theNode = xpe.setSource(rootNode);
            XBeansStandaloneContext sc = new XBeansStandaloneContext();
            sc.declareVariable("this",_theNode);
            xpe.setStaticContext(sc);


            // Declare ns bindings
            if (defaultNS != null)
                sc.setDefaultElementNamespace(defaultNS);


            for (int i = 0; i < namespaceMap.length; i++)
            {
                Map.Entry entry = (Map.Entry) namespaceMap[i];
                sc.declareNamespace((String) entry.getKey(),
                        (String) entry.getValue());
            }
              return xpe.evaluate(_queryExp);
        }
        catch (XPathException e)
        {
            throw new RuntimeException(e);
        }

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        // Create an XPathEvaluator and set the source document


        InputSource is = new InputSource(new File(filename).toURL().toString());
        SAXSource ss = new SAXSource(is);
        XPathEvaluator xpe = new XPathEvaluator(ss);


        // Declare a variable for use in XPath expressions


        StandaloneContext sc = (StandaloneContext)xpe.getStaticContext();
        Variable wordVar = sc.declareVariable("word", "");


        // Compile the XPath expressions used by the application


        XPathExpression findLine =
            xpe.createExpression("//LINE[contains(., $word)]");
        XPathExpression findLocation =
            xpe.createExpression("concat(ancestor::ACT/TITLE, ' ', ancestor::SCENE/TITLE)");
        XPathExpression findSpeaker =
            xpe.createExpression("string(ancestor::SPEECH/SPEAKER[1])");


        // Create a reader for reading input from the console


        BufferedReader in = new BufferedReader(new InputStreamReader(System.in));

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Related Classes of net.sf.saxon.xpath.XPathEvaluator

ApplyXPathJAXP

JDOMExample

net.sf.saxon.AugmentedSource

net.sf.saxon.Configuration

net.sf.saxon.dom.DocumentWrapper

net.sf.saxon.dom.NodeWrapper

net.sf.saxon.event.Stripper

net.sf.saxon.expr.Expression

net.sf.saxon.expr.ExpressionVisitor

net.sf.saxon.expr.XPathContextMajor

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