Examples of net.sf.saxon.query.XQueryExpression

net.sf.saxon.query.XQueryExpression
XQueryExpression represents a compiled query. This object is immutable and thread-safe, the same compiled query may be executed many times in series or in parallel. The object can be created only by using the compileQuery method of the QueryProcessor class.

Various methods are provided for evaluating the query, with different options for delivery of the results.

    public Node evaluateAsDOM(Exchange exchange) throws Exception {
        initialize();


        DOMResult result = new DOMResult();
        DynamicQueryContext context = createDynamicContext(exchange);
        XQueryExpression expression = getExpression();
        expression.pull(context, result, properties);
        return result.getNode();
    }

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        xqExpression += "\r\n<dummy></dummy>";


        Configuration config = new Configuration();
        StaticQueryContext sqc = new StaticQueryContext(config);
        XQueryExpression exp = null;
        try {
            exp = sqc.compileQuery(xqExpression);
        } catch (XPathException e) {
            throw new ContributionResolveException(e);
        }

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     */


    public static void exampleToStreamResult() throws XPathException {
        final Configuration config = new Configuration();
        final StaticQueryContext sqc = config.newStaticQueryContext();
        final XQueryExpression exp = sqc.compileQuery("<a b='c'>{5+2}</a>");


        final DynamicQueryContext dynamicContext = new DynamicQueryContext(config);
        final Properties props = new Properties();
        props.setProperty(OutputKeys.METHOD, "xml");
        props.setProperty(OutputKeys.INDENT, "yes");
        exp.run(dynamicContext, new StreamResult(System.out), props);
    }

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     */


    public static void exampleToSingleton() throws XPathException {
        final Configuration config = new Configuration();
        final StaticQueryContext sqc = config.newStaticQueryContext();
        final XQueryExpression exp = sqc.compileQuery("avg(for $i in 1 to 10 return $i*$i)");


        final DynamicQueryContext dynamicContext = new DynamicQueryContext(config);
        final BigDecimal result = (BigDecimal)exp.evaluateSingle(dynamicContext);
        System.out.println(result);


    }

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     */


    public static void exampleToDOM() throws TransformerException {
        final Configuration config = new Configuration();
        final StaticQueryContext sqc = config.newStaticQueryContext();
        final XQueryExpression exp = sqc.compileQuery("<a xmlns='http://a/uri' xmlns:a='another.uri'>text</a>");


        final DynamicQueryContext dynamicContext = new DynamicQueryContext(config);
        DOMResult result = new DOMResult();
        exp.run(dynamicContext, result, new Properties());


        // now serialize the DOM


        Transformer identity = TransformerFactory.newInstance().newTransformer();
        identity.transform(new DOMSource(result.getNode()), new StreamResult(System.out));

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     */


    public static void exampleToSequence() throws XPathException {
        final Configuration config = new Configuration();
        final StaticQueryContext sqc = config.newStaticQueryContext();
        final XQueryExpression exp = sqc.compileQuery("for $i in 1 to 10 return ($i * $i)");


        final DynamicQueryContext dynamicContext = new DynamicQueryContext(config);
        final SequenceIterator iter = exp.iterator(dynamicContext);
        while (true) {
            Item item = iter.next();
            if (item == null) {
                break;
            }

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     */


    public static void exampleToSerializedSequence() throws XPathException {
        final Configuration config = new Configuration();
        final StaticQueryContext sqc = config.newStaticQueryContext();
        final XQueryExpression exp = sqc.compileQuery("<doc><chap><a>3</a></chap></doc>//a, <b>4</b>, 19");
        Properties props = new Properties();
        props.setProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");


        final DynamicQueryContext dynamicContext = new DynamicQueryContext(config);
        final SequenceIterator iter = exp.iterator(dynamicContext);
        QueryResult.serializeSequence(iter, config, System.out, props);
    }

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     */


    public static void exampleToWrappedSequence() throws XPathException {
        final Configuration config = new Configuration();
        final StaticQueryContext sqc = config.newStaticQueryContext();
        final XQueryExpression exp = sqc.compileQuery("<doc><chap><a>3</a></chap></doc>//a, <b>4</b>, attribute c {5}, 19");
        Properties props = new Properties();
        props.setProperty(OutputKeys.OMIT_XML_DECLARATION, "no");
        props.setProperty(OutputKeys.INDENT, "yes");


        final DynamicQueryContext dynamicContext = new DynamicQueryContext(config);
        final SequenceIterator iter = exp.iterator(dynamicContext);
        final DocumentInfo doc = QueryResult.wrap(iter, config);
        QueryResult.serialize(doc, new StreamResult(System.out), props);
    }

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     */


    public static void exampleToHTMLFile() throws XPathException, IOException {
        final Configuration config = new Configuration();
        final StaticQueryContext sqc = config.newStaticQueryContext();
        final XQueryExpression exp = sqc.compileQuery(new FileReader("query/books-to-html.xq"));
        final DynamicQueryContext dynamicContext = new DynamicQueryContext(config);
        dynamicContext.setContextItem(config.buildDocument(new StreamSource("data/books.xml")));
        final Properties props = new Properties();
        props.setProperty(OutputKeys.METHOD, "html");
        props.setProperty(OutputKeys.DOCTYPE_PUBLIC, "-//W3C//DTD HTML 4.01 Transitional//EN");
        exp.run(dynamicContext, new StreamResult(new File("booklist.html")), props);
    }

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     */


    public static void exampleWithParam() throws XPathException {
        final Configuration config = new Configuration();
        final StaticQueryContext sqc = config.newStaticQueryContext();
        final XQueryExpression exp = sqc.compileQuery("declare variable $in as xs:integer external;" +
                "$in * $in");


        final DynamicQueryContext dynamicContext = new DynamicQueryContext(config);
        dynamicContext.setParameterValue("in", Int64Value.makeIntegerValue(17));
        final Long result = (Long)exp.evaluateSingle(dynamicContext);
        System.out.println("17 * 17 = " + result);


    }

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