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 XQPreparedExpression prepareExpression(InputStream xquery, XQStaticContext properties) throws XQException {
        checkNotClosed();
        try {
            SaxonXQStaticContext xqStaticContext = ((SaxonXQStaticContext)properties);
            StaticQueryContext sqc = xqStaticContext.getSaxonStaticQueryContext();
            XQueryExpression exp = sqc.compileQuery(xquery, null);
            DynamicQueryContext dqc = new DynamicQueryContext(config);
            return new SaxonXQPreparedExpression(this, exp, xqStaticContext, dqc);
        } catch (XPathException e) {
            throw newXQException(e);
        } catch (IOException e) {

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    public XQPreparedExpression prepareExpression(Reader xquery, XQStaticContext properties) throws XQException {
        checkNotClosed();
        try {
            SaxonXQStaticContext xqStaticContext = ((SaxonXQStaticContext)properties);
            StaticQueryContext sqc = xqStaticContext.getSaxonStaticQueryContext();
            XQueryExpression exp = sqc.compileQuery(xquery);
            DynamicQueryContext dqc = new DynamicQueryContext(config);
            return new SaxonXQPreparedExpression(this, exp, xqStaticContext, dqc);
        } catch (XPathException e) {
            throw newXQException(e);
        } catch (IOException e) {

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    public XQPreparedExpression prepareExpression(String xquery, XQStaticContext properties) throws XQException {
        checkNotClosed();
        try {
            SaxonXQStaticContext xqStaticContext = ((SaxonXQStaticContext)properties);
            StaticQueryContext sqc = xqStaticContext.getSaxonStaticQueryContext();
            XQueryExpression exp = sqc.compileQuery(xquery);
            DynamicQueryContext dqc = new DynamicQueryContext(config);
            return new SaxonXQPreparedExpression(this, exp, xqStaticContext, dqc);
        } catch (XPathException e) {
            throw newXQException(e);
        } catch (NullPointerException e) {

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    public XQPreparedExpression copyPreparedExpression(XQPreparedExpression expression) throws XQException {
        checkNotClosed();
        if (!(expression instanceof SaxonXQPreparedExpression)) {
            throw new IllegalArgumentException("Supplied expression must be compiled using Saxon");
        }
        XQueryExpression xqe = ((SaxonXQPreparedExpression)expression).getXQueryExpression();
        if (xqe.getExecutable().getConfiguration() != config) {
            throw new IllegalArgumentException("Supplied expression must derive from the same XQDataSource");
        }
        SaxonXQStaticContext sqc = ((SaxonXQPreparedExpression)expression).getSaxonXQStaticContext();
        DynamicQueryContext dqc = new DynamicQueryContext(config);
        return new SaxonXQPreparedExpression(this, xqe, sqc, dqc);

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    public XQResultSequence executeQuery(InputStream query) throws XQException {
        checkNotClosed();
        try {
            StaticQueryContext env = sqc.getSaxonStaticQueryContext();
            XQueryExpression exp = env.compileQuery(query, null);
            SaxonXQPreparedExpression pe = new SaxonXQPreparedExpression(connection, exp, sqc, context);
            return pe.executeQuery();
        } catch (XPathException e) {
            XQException xqe = new XQException(e.getMessage());
            xqe.initCause(e);

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    public XQResultSequence executeQuery(Reader query) throws XQException {
        checkNotClosed();
        try {
            StaticQueryContext env = sqc.getSaxonStaticQueryContext();
            XQueryExpression exp = env.compileQuery(query);
            SaxonXQPreparedExpression pe = new SaxonXQPreparedExpression(connection, exp, sqc, context);
            return pe.executeQuery();
        } catch (XPathException e) {
            XQException xqe = new XQException(e.getMessage());
            xqe.initCause(e);

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    public XQResultSequence executeQuery(String query) throws XQException {
        checkNotClosed();
        try {
            StaticQueryContext env = sqc.getSaxonStaticQueryContext();
            XQueryExpression exp = env.compileQuery(query);
            SaxonXQPreparedExpression pe = new SaxonXQPreparedExpression(connection, exp, sqc, context);
            XQResultSequence result = pe.executeQuery();
            ((Closable)result).setClosableContainer(this);
            return result;
        } catch (XPathException e) {

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     * 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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     * 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());
        return pull;
    }

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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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