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In the longer term, this entire API may at some stage be superseded by a proposed standard Java API for XQuery.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

     * their mapping to XPath data types, see {@link XPathEvaluator#evaluate}
     */


    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.setParameter("in", new Long(17));
        final Long result = (Long)exp.evaluateSingle(dynamicContext);

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    public static void examplePipeline() throws XPathException {
        final Configuration config = new Configuration();


        // Compile the first query
        final StaticQueryContext sqc1 = config.newStaticQueryContext();
        final XQueryExpression exp1 = sqc1.compileQuery("declare variable $in as xs:integer external;" +
                "document{ <a>{$in * $in}</a> }");


        // Compile the second query (each query should have its own static context)
        final StaticQueryContext sqc2 = config.newStaticQueryContext();
        final XQueryExpression exp2 = sqc2.compileQuery("/a + 5");


        // Run the first query
        final DynamicQueryContext dynamicContext = new DynamicQueryContext(config);
        dynamicContext.setParameter("in", new Long(3));
        final NodeInfo doc = (NodeInfo)exp1.evaluateSingle(dynamicContext);

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     * checking of the supplied arguments
     */


    public static void exampleDirectFunction() throws XPathException {
        final Configuration config = new Configuration();
        final StaticQueryContext sqc = config.newStaticQueryContext();
        final XQueryExpression exp1 = sqc.compileQuery("declare namespace f='f.ns';" +
                "declare function f:t1($v1 as xs:integer, $v2 as xs:untypedAtomic*) { " +
                "   $v1 div $v2" +
                "};" +
                "10");

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        c.sourceParserClass = sourceParserClass;
        c.styleParserClass = styleParserClass;
        //c.outputURIResolver = outputURIResolver;
        c.timing = timing;
        c.defaultXsltCompilerInfo = new CompilerInfo(defaultXsltCompilerInfo);
        c.defaultStaticQueryContext = new StaticQueryContext(getDefaultStaticQueryContext());
        c.allowExternalFunctions = allowExternalFunctions;
        c.lazyConstructionMode = lazyConstructionMode;
        c.allowMultiThreading = allowMultiThreading;
        c.preEvaluateDocFunction = preEvaluateDocFunction;
        c.namePool = namePool;

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     * Get the default options for XQuery compilation
     */


    public StaticQueryContext getDefaultStaticQueryContext() {
        if (defaultStaticQueryContext == null) {
            defaultStaticQueryContext = new StaticQueryContext(this, true);
        }
        return defaultStaticQueryContext;
    }

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     * Get a new StaticQueryContext (which is also the factory class for creating a query parser)
     * @return a new StaticQueryContext
     */


    public StaticQueryContext newStaticQueryContext() {
        return new StaticQueryContext(this, false);
    }

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     * directly to System.out
     */


    public static void exampleToStreamResult() throws XPathException {
        final Configuration config = new Configuration();
        final StaticQueryContext sqc = new StaticQueryContext(config);
        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 = new StaticQueryContext(config);
        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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     * result, its string value is output.
     */


    public static void exampleToSequence() throws XPathException {
        final Configuration config = new Configuration();
        final StaticQueryContext sqc = new StaticQueryContext(config);
        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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     * output by serializing each item individually, with each item on a new line.
     */


    public static void exampleToSerializedSequence() throws XPathException {
        final Configuration config = new Configuration();
        final StaticQueryContext sqc = new StaticQueryContext(config);
        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, "yes");


        final DynamicQueryContext dynamicContext = new DynamicQueryContext(config);

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