Examples of client.net.sf.saxon.ce.Controller

client.net.sf.saxon.ce.Controller
The Controller is equivalent to Saxon-HE's implementation of the same name, 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, 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. An inert version of the controller can be used to simply hold state for the benefit of the JavaScript API, controller settings can then be copied to a 'live' Controller instance using importControllerSettings()
A dummy Controller is created by the JavaScript API for holding settings.
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.
@author Michael H. Kay @since 8.4

                throw new AssertionError(
                        "evaluateItem() is not implemented in the subclass " + getClass());
        } else if ((m & ITERATE_METHOD) != 0) {
            return iterate(context).next();
        } else {
            Controller controller = context.getController();
            XPathContext c2 = context.newMinorContext();
            SequenceOutputter seq = controller.allocateSequenceOutputter(1);
            PipelineConfiguration pipe = controller.makePipelineConfiguration();
            seq.setPipelineConfiguration(pipe);
            c2.setTemporaryReceiver(seq);
            process(c2);
            seq.close();
            Item result = seq.getFirstItem();

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        if ((m & EVALUATE_METHOD) != 0) {
            return super.iterate(context);
        } else if ((m & ITERATE_METHOD) != 0) {
            throw new AssertionError("iterate");
        } else {
            Controller controller = context.getController();
            XPathContext c2 = context.newMinorContext();
            SequenceOutputter seq = controller.allocateSequenceOutputter(20);
            PipelineConfiguration pipe = controller.makePipelineConfiguration();
            seq.setPipelineConfiguration(pipe);
            c2.setTemporaryReceiver(seq);
            process(c2);
            seq.close();
            return seq.iterate();

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    * Evaluate the variable
    */


    @Override
    public ValueRepresentation evaluateVariable(XPathContext context) throws XPathException {
        Controller controller = context.getController();
        Bindery b = controller.getBindery();
        boolean wasSupplied;
        try {
            wasSupplied = b.useGlobalParameter(
                    getVariableQName(), getSlotNumber(), getRequiredType(), context);
        } catch (XPathException e) {

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            same = NodeKindTest.makeNodeKindTest(node.getNodeKind());
        } else {
            same = new NameTest(node);
        }


        Controller controller = (context == null ? null : context.getController());
        AxisIterator preceding = node.iterateAxis(Axis.PRECEDING_SIBLING, same);


        int i = 1;
        while (true) {
            NodeInfo prev = (NodeInfo)preceding.next();
            if (prev == null) {
                break;
            }


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


            i++;
        }


        if (controller != null) {
            controller.setRememberedNumber(node, i);
        }
        return 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) && from==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();
        }


        if (from != null && from.matches(node, context)) {
            return num;
        }


        SequenceIterator preceding =
                node.iterateAxis(Axis.PRECEDING_OR_ANCESTOR, filter);
       
        while (true) {
            NodeInfo prev = (NodeInfo)preceding.next();
            if (prev == null) {
                break;
            }


            if (count.matches(prev, context)) {
                if (num == 1 && memoNode != null && prev.isSameNodeInfo(memoNode)) {
                    num = memoNumber + 1;
                    break;
                }
                num++;
            }


            if (from != null && from.matches(prev, context)) {
                break;
            }
        }


        if (memoise) {
            Object[] memo = new Object[2];
            memo[0] = node;
            memo[1] = Integer.valueOf(num);
            controller.setUserData(inst, "xsl:number", memo);
        }
        return num;
    }

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     * the current date and time are taken directly from the system clock
     * @return the current xs:dateTime
     */


    public static DateTimeValue getCurrentDateTime(XPathContext context) {
        Controller c;
        if (context == null || (c = context.getController()) == null) {
            // non-XSLT/XQuery environment
            // We also take this path when evaluating compile-time expressions that require an implicit timezone.
            try {
                return DateTimeValue.fromJavaDate(new Date());
            } catch (XPathException e) {
                throw new IllegalStateException();
            }
        } else {
            return c.getCurrentDateTime();
        }
    }

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     * 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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     * @param context the dynamic execution context
     * @return either null, or a tail call that the caller must invoke on return
     * @throws net.sf.saxon.trans.XPathException
     */
    public TailCall processLeavingTail(XPathContext context) throws XPathException {
        Controller controller = context.getController();
        assert controller != null;
        if (LogConfiguration.loggingIsEnabled() && LogController.traceIsEnabled()) {
          TraceListener listener = LogController.getTraceListener();
        listener.enter(getInstructionInfo(), context);
        child.process(context);

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        // if there's no namespace - or no namespace support
        if (element == null) {
            element = document.createElement(localName);
        }
        // special case for html element: write to the document node
        Controller controller = pipe.getController();
        if (controller != null && controller.getApiCommand() == APIcommand.UPDATE_HTML
            && (localName.equals("html") || localName.equals("head") || localName.equals("body"))) {
          if (localName.equals("html")){
            element = (Element)document.getFirstChild();
          } else {
            element = (Element)document.getElementsByTagName(localName.toUpperCase()).getItem(0);

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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;
            last = new LastValue(1);

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