Examples of net.sf.saxon.query.StaticQueryContext

net.sf.saxon.query.StaticQueryContext
StaticQueryContext contains information used to build a StaticContext for use when processing XQuery expressions.
Despite its name, StaticQueryContext no longer implements the StaticContext interface, which means it cannot be used directly by Saxon when parsing a query. Instead it is first copied to create a QueryModule object, which does implement the StaticContext interface.
The application constructs a StaticQueryContext and initializes it with information about the context, for example, default namespaces, base URI, and so on. When a query is compiled using this StaticQueryContext, the query parser makes a copy of the StaticQueryContext and uses this internally, modifying it with information obtained from the query prolog, as well as information such as namespace and variable declarations that can occur at any point in the query. The query parser does not modify the original StaticQueryContext supplied by the calling application, which may therefore be used for compiling multiple queries, serially or even in multiple threads.

This class forms part of Saxon's published XQuery API. Methods that are considered stable are labelled with the JavaDoc "since" tag. The value 8.4 indicates a method introduced at or before Saxon 8.4; other values indicate the version at which the method was introduced.

In the longer term, this entire API may at some stage be superseded by a proposed standard Java API for XQuery.
@since 8.4

    /**
     * Run a query against input that is supplied using the pull interface
     */


    public void query(PullProvider in, String query, OutputStream out) throws XPathException {
        final StaticQueryContext sqc = config.newStaticQueryContext();
        final XQueryExpression exp = sqc.compileQuery(query);
        final DynamicQueryContext dynamicContext = new DynamicQueryContext(config);
        dynamicContext.setContextItem(config.buildDocument(new PullSource(in)));
        Properties props = new Properties();
        props.setProperty(OutputKeys.INDENT, "yes");
        exp.run(dynamicContext, new StreamResult(out), props);

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     * Run a query to produce a sequence of element nodes, and get a PullProvider over the results
     * of the query
     */


    public PullProvider pullQueryResults(NodeInfo source, String query) throws XPathException {
        final StaticQueryContext sqc = config.newStaticQueryContext();
        final XQueryExpression exp = sqc.compileQuery(query);
        final DynamicQueryContext dynamicContext = new DynamicQueryContext(config);
        dynamicContext.setContextItem(source);
        PullProvider pull = new PullFromIterator(exp.iterator(dynamicContext));
        pull = new PullNamespaceReducer(pull);
        pull.setPipelineConfiguration(config.makePipelineConfiguration());

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     * XQStaticContext
     * @return a newly constructed StaticQueryContext object
     */


    protected StaticQueryContext getSaxonStaticQueryContext() {
        StaticQueryContext sqc = config.newStaticQueryContext();
        sqc.getExecutable().setSchemaAware(config.isLicensedFeature(Configuration.LicenseFeature.SCHEMA_VALIDATION));
        sqc.setBaseURI(baseURI);
        sqc.setConstructionMode(constructionModeIsPreserve ? Validation.PRESERVE : Validation.STRIP);
        sqc.setDefaultElementNamespace(defaultElementNamespace);
        sqc.setDefaultFunctionNamespace(defaultFunctionNamespace);
        sqc.setEmptyLeast(emptyLeast);
        sqc.setInheritNamespaces(inheritNamespaces);
        sqc.setPreserveBoundarySpace(preserveBoundarySpace);
        sqc.setPreserveNamespaces(preserveNamespaces);
        if (contextItemStaticType != null) {
            sqc.setRequiredContextItemType(contextItemStaticType.getSaxonItemType());
        }
        for (Iterator iter = namespaces.keySet().iterator(); iter.hasNext();) {
            String prefix = (String)iter.next();
            String uri = (String)namespaces.get(prefix);
            sqc.declareNamespace(prefix, uri);
        }
        return sqc;
    }

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     * directly to System.out
     */


    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");

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     * to the Java application
     */


    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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     * an identity transform
     */


    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());

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     * result, its string value is output.
     */


    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();

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     * not contain free-standing attribute nodes.
     */


    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);

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     * the type of each item, and serializing the resulting document.
     */


    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);

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     * node) is supplied as the content of another file.
     */


    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");

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