Examples of net.sf.saxon.Controller

net.sf.saxon.Controller
The Controller is Saxon's implementation of the JAXP Transformer class, and represents an executing instance of a transformation or query. Multiple concurrent executions of the same transformation or query will use different Controller instances. This class is therefore not thread-safe.
The Controller is serially reusable, as required by JAXP: when one transformation or query is finished, it can be used to run another. However, there is no advantage in doing this rather than allocating a new Controller each time.
The Controller can also be used when running Java applications that use neither XSLT nor XQuery. A dummy Controller is created when running free-standing XPath expressions.
The Controller holds those parts of the dynamic context that do not vary during the course of a transformation or query, or that do not change once their value has been computed. This also includes those parts of the static context that are required at run-time.
Wherever possible XSLT applications should use the JAXP Transformer class directly, rather than relying on Saxon-specific methods in the Controller. However, some features are currently available only through this class. This applies especially to new features specific to XSLT 2.0, since the JAXP interface still supports only XSLT 1.0. Such methods may be superseded in the future by JAXP methods.
Many methods on the Controller are designed for internal use and should not be considered stable. From release 8.4 onwards, those methods that are considered sufficiently stable to constitute path of the Saxon public API are labelled with the JavaDoc tag "since": the value indicates the release at which the method was added to the public API. @author Michael H. Kay @since 8.4

     * Construct a new context as a copy of another. The new context is effectively added
     * to the top of a stack, and contains a pointer to the previous context
     */


    public XPathContextMajor newContext() {
        Controller controller = new Controller(config);
        return controller.newXPathContext();
//        notAllowed();
//        return null;
    }

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        if (templates == null) {
            configureLiaison(stylesheet);
        }


        Controller transformer = (Controller)templates.newTransformer();


        if (fileNameParameter != null) {
            transformer.setParameter(fileNameParameter, xmlFile);
        }
        if (fileDirParameter != null) {
            transformer.setParameter(fileDirParameter, baseDir.getAbsolutePath());
        }


        try {
            long styleSheetLastModified = stylesheet.getLastModified();
            inF = new File(baseDir, xmlFile);

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    private void transform(File in, File out) {
        if (templates == null) {
            throw new BuildException("No transformer has been created");
        }
        try {
            Controller transformer = createTransformer(templates);
            Source ss = new StreamSource(in);
            Result sr = new StreamResult(out);
            transformer.transform(ss, sr);
        } catch (TransformerException ex) {
            log("Failed to transform " + in, Project.MSG_INFO);
            if (out != null) {
                out.delete();
            }

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            throw new BuildException(ex);
        }
    }


    private Controller createTransformer(PreparedStylesheet pss) throws XPathException {
        Controller transformer = (Controller)pss.newTransformer();
        transformer.setInitialMode(initialMode);
        transformer.setInitialTemplate(initialTemplate);
        if (tracing) {
            transformer.addTraceListener(new XSLTTraceListener());
        }
        if (recoveryPolicy != null) {
            if (recoveryPolicy.equals("silent")) {
                transformer.setRecoveryPolicy(Configuration.RECOVER_SILENTLY);
            } else if (recoveryPolicy.equals("recover")) {
                transformer.setRecoveryPolicy(Configuration.RECOVER_WITH_WARNINGS);
            } else {
                transformer.setRecoveryPolicy(Configuration.DO_NOT_RECOVER);
            }
        }
        for (Enumeration e = params.elements(); e.hasMoreElements();) {
            Param p = (Param) e.nextElement();
            if (p.shouldUse()) {
                transformer.setParameter(p.getName(), p.getExpression());
            }
        }
        return transformer;
    }

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     * if it is referenced).
     * @param exec the Executable
    */


    public XPathContextMajor(Item item, Executable exec) {
        controller = new Controller(exec.getConfiguration(), exec);
        if (item != null) {
            UnfailingIterator iter = SingletonIterator.makeIterator(item);
            iter.next();
            currentIterator = iter;
        }

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    public XPathContextMajor(Item item, Configuration config) {
        // No longer used internally but retained for backwards compatibility (8.8)
        Executable exec = new Executable(config);
        exec.setHostLanguage(Configuration.JAVA_APPLICATION);
        controller = new Controller(config, exec);
        if (item != null) {
            UnfailingIterator iter = SingletonIterator.makeIterator(item);
            iter.next();
            currentIterator = iter;
        }

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                } else {
                    return SequenceExtent.makeSequenceExtent(exp.iterate(context));
                }


            case PROCESS:
                Controller controller = context.getController();
                XPathContext c2 = context.newMinorContext();
                c2.setOrigin(exp);
                SequenceOutputter seq = controller.allocateSequenceOutputter(20);
                PipelineConfiguration pipe = controller.makePipelineConfiguration();
                pipe.setHostLanguage(exp.getHostLanguage());
                seq.setPipelineConfiguration(pipe);
                c2.setTemporaryReceiver(seq);
                seq.open();
                exp.process(c2);

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        final UserFunction fn1 = exp1.getStaticContext().getUserDefinedFunction("f.ns", "t1", 2);
        if (fn1 == null) {
            throw new IllegalStateException("Function f:t1() not found");
        }
        final Controller controller = exp1.newController();
        final Value[] arglist = new Value[2];
        arglist[0] = new Int64Value(10);
        for (int i = 3; i < 10; i++) {
            arglist[1] = new Int64Value(i);
            final ValueRepresentation result = fn1.call(arglist, controller);

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    */


    public Item evaluateItem(XPathContext context) throws XPathException {
        Item val = argument[0].evaluateItem(context);
        String label = argument[1].evaluateAsString(context).toString();
        Controller controller = context.getController();
        if (controller.isTracing()) {
            notifyListener(label, Value.asValue(val), context);
        } else {
            PrintStream out = controller.getTraceFunctionDestination();
            if (out != null) {
                traceItem(val, label, out);
            }
        }
        return val;

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    /**
    * Iterate over the results of the function
    */


    public SequenceIterator iterate(XPathContext context) throws XPathException {
        Controller controller = context.getController();
        if (controller.isTracing()) {
            String label = argument[1].evaluateAsString(context).toString();
            Value value = Value.asValue(ExpressionTool.eagerEvaluate(argument[0], context));
            notifyListener(label, value, context);
            return value.iterate();
        } else {
            PrintStream out = controller.getTraceFunctionDestination();
            if (out == null) {
                return argument[0].iterate(context);
            } else {
                return new TracingIterator(argument[0].iterate(context),
                        argument[1].evaluateAsString(context).toString(),

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