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 Such methods may be superseded in the future by JAXP methods.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

            return BooleanValue.FALSE;
        }
        String href = hrefVal.getStringValue();


        // suppress all error messages while attempting to fetch the document
        Controller controller = context.getController();
        ErrorListener old = controller.getErrorListener();
        controller.setErrorListener(new ErrorListener() {
            public void warning(TransformerException exception) {}
            public void error(TransformerException exception) {}
            public void fatalError(TransformerException exception) {}
        });
        try {
            boolean b = docAvailable(href, context);
            controller.setErrorListener(old);
            return BooleanValue.get(b);
        } catch (URISyntaxException err) {
            controller.setErrorListener(old);
            XPathException xe = new XPathException(err);
            xe.setErrorCode("FODC0005");
            xe.setXPathContext(context);
            xe.setLocator(this);
            throw xe;

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        public static FromSource INSTANCE = new FromSource();


        public ValueRepresentation convert(Object object, XPathContext context) throws XPathException {
            ParseOptions options = new ParseOptions();
            Controller controller = context.getController();
            if (controller != null) {
                options.setSchemaValidationMode(controller.getSchemaValidationMode());
            }
            return context.getConfiguration().buildDocument((Source)object, options);
        }

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            // this indicates an error in the user-written extension code
            throw new AssertionError("evaluateItem() is not implemented in the subclass " + this.getClass());
        } else if ((m & Expression.ITERATE_METHOD) != 0) {
            return iterate(context).next();
        } else {
            Controller controller = context.getController();
            XPathContext c2 = context.newMinorContext();
            c2.setOrigin(this);
            SequenceOutputter seq = controller.allocateSequenceOutputter(1);
            PipelineConfiguration pipe = controller.makePipelineConfiguration();
            pipe.setHostLanguage(getContainer().getHostLanguage());
            seq.setPipelineConfiguration(pipe);
            c2.setTemporaryReceiver(seq);
            process(c2);
            Item item = seq.getFirstItem();

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        } else if ((m & Expression.ITERATE_METHOD) != 0) {
            // this indicates an error in the user-written extension code
            throw new AssertionError("iterate() is not implemented in the subclass " + this.getClass());


        } else {
            Controller controller = context.getController();
            XPathContext c2 = context.newMinorContext();
            c2.setOrigin(this);
            SequenceOutputter seq = controller.allocateSequenceOutputter(10);
            PipelineConfiguration pipe = controller.makePipelineConfiguration();
            pipe.setHostLanguage(getContainer().getHostLanguage());
            seq.setPipelineConfiguration(pipe);
            c2.setTemporaryReceiver(seq);


            process(c2);

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    * Enumerate the results of the expression
    */


    public SequenceIterator iterate(XPathContext context) throws XPathException {


        Controller controller = context.getController();


        NodeInfo arg2 = (NodeInfo)argument[1].evaluateItem(context);
        arg2 = arg2.getRoot();
        if (arg2.getNodeKind() != Type.DOCUMENT) {
            dynamicError("In the idref() function," +
                            " the tree being searched must be one whose root is a document node", "FODC0001", context);
            return null;
        }
        DocumentInfo doc = (DocumentInfo)arg2;


        // If the argument is a singleton, we evaluate the function
        // directly; otherwise we recurse to evaluate it once for each Item
        // in the sequence.


        Expression expression = argument[0];
        if (Cardinality.allowsMany(expression.getCardinality())) {
            SequenceIterator keys = argument[0].iterate(context);
            return getIdrefMultiple(doc, keys, context);


        } else {
            AtomicValue keyValue = (AtomicValue)argument[0].evaluateItem(context);
            if (keyValue == null) {
                return EmptyIterator.getInstance();
            }
            KeyManager keyManager = controller.getKeyManager();
            return keyManager.selectByKey(idRefKey, doc, keyValue, context);


        }
    }

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            Emitter emitter;


            CharacterMapExpander characterMapExpander = null;
            String useMaps = props.getProperty(SaxonOutputKeys.USE_CHARACTER_MAPS);
            if (useMaps != null) {
                Controller controller = (pipe == null ? null : pipe.getController());
                if (controller == null) {
                    XPathException de = new XPathException("Cannot use character maps in an environment with no Controller");
                    de.setErrorCode(SaxonErrorCode.SXSE0001);
                    throw de;
                }
                characterMapExpander = controller.makeCharacterMapExpander(useMaps, this);
                characterMapExpander.setPipelineConfiguration(pipe);
            }


            ProxyReceiver normalizer = null;
            String normForm = props.getProperty(SaxonOutputKeys.NORMALIZATION_FORM);

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    public void setPipelineConfiguration(PipelineConfiguration pipe) {
        if (pipe != null) {
            super.setPipelineConfiguration(pipe);
            if (context == null) {
                Controller controller = pipe.getController();
                if (controller != null) {
                    context = controller.newXPathContext();
                }
            }
            if (element == null) {
                element = new Orphan(pipe.getConfiguration());
                element.setNodeKind(Type.ELEMENT);

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                "   $v1 div $v2" +
                "};" +
                "10");


        final UserFunction fn1 = sqc.getUserDefinedFunction("f.ns", "t1", 2);
        final Controller controller = exp1.getController();
        final Value[] arglist = new Value[2];
        arglist[0] = new IntegerValue(10);
        for (int i=3; i<10; i++) {
            arglist[1] = new IntegerValue(i);
            final Value result = fn1.call(arglist, controller);

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        return list.iterator();
    }




    public TailCall processLeavingTail(XPathContext context) throws XPathException {
        Controller controller = context.getController();
        String prefix = name.evaluateAsString(context);


        if (!(prefix.equals("") || XMLChar.isValidNCName(prefix))) {
            DynamicError err = new DynamicError("Namespace prefix is invalid: " + prefix, this);
            err.setErrorCode("XT0920");
            err.setXPathContext(context);
            context.getController().recoverableError(err);
            return null;
        }


        if (prefix.equals("xml") || prefix.equals("xmlns")) {
            DynamicError err = new DynamicError("Namespace prefix '" + prefix + "' is not allowed", this);
            err.setErrorCode("XT0920");
            err.setXPathContext(context);
            context.getController().recoverableError(err);
            return null;
        }


        String uri = expandChildren(context).toString();


        if (uri.equals("")) {
            DynamicError err = new DynamicError("Namespace URI is an empty string", this);
            err.setErrorCode("XT0930");
            err.setXPathContext(context);
            context.getController().recoverableError(err);
            return null;
        }


        int nscode = controller.getNamePool().allocateNamespaceCode(prefix, uri);
        SequenceReceiver out = context.getReceiver();
        out.namespace(nscode, ReceiverOptions.REJECT_DUPLICATES);
        return null;
    }

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            case EVALUATE_METHOD:
                dynamicError("evaluateItem() is not implemented in the subclass " + this.getClass(), context.getController());
            case ITERATE_METHOD:
                return iterate(context).next();
            case PROCESS_METHOD:
                Controller controller = context.getController();
                XPathContext c2 = context.newMinorContext();
                c2.setOrigin(this);
                SequenceOutputter seq = new SequenceOutputter();
                seq.setConfiguration(controller.getConfiguration());
                seq.setDocumentLocator(getExecutable().getLocationMap());
                c2.setTemporaryReceiver(seq);
                process(c2);
                seq.close();
                return seq.getFirstItem();

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