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 Such methods may be superseded in the future by JAXP methods.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

                }
            case ITERATE_METHOD:
                dynamicError("iterate() is not implemented in the subclass " + this.getClass(), context.getController());
                break;
            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.getSequence().iterate(context);

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            NodeInfo prev = (NodeInfo)preceding.next();
            if (prev == null) {
                break;
            }


            Controller controller = context.getController();
            int memo = controller.getRememberedNumber(prev);
            if (memo>0) {
                memo += i;
                controller.setRememberedNumber(node, memo);
                return memo;
            }


            i++;
        }

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    public static int getNumberAny(Expression inst, NodeInfo node, Pattern count,
                    Pattern from, XPathContext context, boolean hasVariablesInPatterns) throws XPathException {


        NodeInfo memoNode = null;
        int memoNumber = 0;
        Controller controller = context.getController();
        boolean memoise = (!hasVariablesInPatterns && count!=null);
        if (memoise) {
            Object[] memo = (Object[])controller.getUserData(inst, "xsl:number");
            if (memo != null) {
                memoNode = (NodeInfo)memo[0];
                memoNumber = ((Integer)memo[1]).intValue();
            }
        }


        int num = 0;
        if (count==null) {
            if (node.getFingerprint()==-1) {  // unnamed node
                count = new NodeTestPattern(NodeKindTest.makeNodeKindTest(node.getNodeKind()));
            } else {
                count = new NodeTestPattern(new NameTest(node));
            }
            num = 1;
        } else if (count.matches(node, context)) {
            num = 1;
        }


        // We use a special axis invented for the purpose: the union of the preceding and
        // ancestor axes, but in reverse document order


        // Pass part of the filtering down to the axis iterator if possible
        NodeTest filter;
        if (from==null) {
            filter = count.getNodeTest();
        } else if (from.getNodeKind()==Type.ELEMENT && count.getNodeKind()==Type.ELEMENT) {
            filter = NodeKindTest.ELEMENT;
        } else {
            filter = AnyNodeTest.getInstance();
        }


        SequenceIterator preceding =
            node.iterateAxis(Axis.PRECEDING_OR_ANCESTOR, filter);


        while (true) {
            NodeInfo prev = (NodeInfo)preceding.next();
            if (prev == null) {
                break;
            }
            if (from!=null && from.matches(prev, context)) {
                return num;
            }
            if (count.matches(prev, context)) {
                if (num==1 && memoNode!=null && prev.isSameNodeInfo(memoNode)) {
                    num = memoNumber + 1;
                    break;
                }
                num++;
            }
        }
        if (memoise) {
            Object[] memo = new Object[2];
            memo[0] = node;
            memo[1] = new Integer(num);
            controller.setUserData(inst, "xsl:number", memo);
        }
        return num;
    }

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    /**
    * Evaluate the variable
    */


    public Value evaluateVariable(XPathContext context) throws XPathException {
        Controller controller = context.getController();
        Bindery b = controller.getBindery();
        boolean wasSupplied = b.useGlobalParameter(getVariableFingerprint(), this);
        if (wasSupplied) {
            return b.getGlobalVariableValue(this);
        } else {
            if (isRequiredParam()) {

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        }
        return list.iterator();
    }


    public TailCall processLeavingTail(XPathContext context) throws XPathException {
        Controller controller = context.getController();
        Emitter emitter = controller.getMessageEmitter();
        if (emitter==null) {
            emitter = controller.makeMessageEmitter();
        }
        if (emitter.getWriter()==null) {
            emitter.setWriter(new OutputStreamWriter(System.err));
        }

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    * @return a TailCall to be executed by the caller, always null for this instruction
    */


    public TailCall processLeavingTail(XPathContext context) throws XPathException
    {
        Controller controller = context.getController();
        int nameCode = evaluateNameCode(context);
        if (nameCode == -1) {
            return null;
        }
        SequenceReceiver out = context.getReceiver();
        int opt = options;
        int ann = annotation;


      // we may need to change the namespace prefix if the one we chose is
      // already in use with a different namespace URI: this is done behind the scenes
      // by the Outputter


        String value = expandChildren(context).toString();
        if (schemaType != null) {
            // test whether the value actually conforms to the given type
            try {
                schemaType.validateContent(value, DummyNamespaceResolver.getInstance());
                if (schemaType.isNamespaceSensitive()) {
                    options |= ReceiverOptions.NEEDS_PREFIX_CHECK;
                }
            } catch (ValidationException err) {
                throw new ValidationException("Attribute value " + Err.wrap(value, Err.VALUE) +
                                               " does not match the required type " +
                                               schemaType.getDescription() + ". " +
                                               err.getMessage());
            }
        } else if (validationAction==Validation.STRICT ||
                validationAction==Validation.LAX) {
            long res = controller.getConfiguration().validateAttribute(nameCode,
                                                                         value,
                                                                         validationAction);
            ann = (int)(res & 0xffffffff);
            opt |= (int)(res >> 32);
        }

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        return null;
    }


    protected int evaluateNameCode(XPathContext context) throws XPathException, XPathException {
        Controller controller = context.getController();
        NamePool pool = controller.getNamePool();


        Item nameValue = attributeName.evaluateItem(context);


        String prefix = null;
        String localName = null;

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        }    
        return list.iterator();
    }


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


        GroupIterator groupIterator = getGroupIterator(context);


        XPathContextMajor c2 = context.newContext();
        c2.setOrigin(this);
        c2.setCurrentIterator(groupIterator);
        c2.setCurrentGroupIterator(groupIterator);
        c2.setCurrentTemplate(null);


        if (controller.isTracing()) {
            TraceListener listener = controller.getTraceListener();
            while(true) {
                Item item = groupIterator.next();
                if (item == null) break;
                listener.startCurrentItem(item);
                action.process(c2);

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    * date/time of this transformation run. Two calls within the same
    * transformation will always return the same answer.
    */


    public DateTimeValue(XPathContext context) {
        Controller c = context.getController();
        if (c==null) {
            // non-XSLT environment
            calendar = new GregorianCalendar();
        } else {
            calendar = c.getCurrentDateTime();
        }
        zoneSpecified = true;
    }

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    /**
    * Evaluate in a general context
    */


    public Item evaluateItem(XPathContext c) throws XPathException {
        Controller controller = c.getController();
        AtomicValue content = (AtomicValue)argument[0].evaluateItem(c);
        StringReader sr = new StringReader(content.getStringValue());
        InputSource is = new InputSource(sr);
        is.setSystemId(baseURI);
        SAXSource source = new SAXSource(is);
        source.setSystemId(baseURI);
        Builder b = controller.makeBuilder();
        Stripper s = controller.makeStripper(b);
        try {
            new Sender(controller.getConfiguration()).send(source, s);
            return b.getCurrentDocument();
        } catch (XPathException err) {
            throw new DynamicError(err);
        }
    }

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