Examples of net.sf.saxon.om.ValueRepresentation

net.sf.saxon.om.ValueRepresentation
A ValueRepresentation is a representation of a Value. This is a marker interface used to represent the union of two classes: Value, and NodeInfo. Either of these two classes can be used to represent a value. The class is used primarily to represent the value of a variable.
This class is intended primarily for internal use, and should not be considered part of the Saxon public API.


    public TailCall processLeavingTail(XPathContext context) throws XPathException {
        if (binding==null) {
            throw new IllegalStateException("saxon:assign binding has not been fixed up");
        }
        ValueRepresentation value = getSelectValue(context);
        if (value instanceof Closure) {
            value = SequenceExtent.makeSequenceExtent(((Closure)value).iterate());
        }
        if (binding instanceof GeneralVariable) {
            if (binding.isGlobal()) {

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    public SequenceIterator iterate(XPathContext context) throws XPathException {
        // minimize stack consumption by evaluating nested LET expressions iteratively
        LetExpression let = this;
        while (true) {
            ValueRepresentation val = let.eval(context);
            context.setLocalVariable(let.getLocalSlotNumber(), val);
            if (let.action instanceof LetExpression) {
                let = (LetExpression) let.action;
            } else {
                break;

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    public EventIterator iterateEvents(XPathContext context) throws XPathException {
        // minimize stack consumption by evaluating nested LET expressions iteratively
        LetExpression let = this;
        while (true) {
            ValueRepresentation val = let.eval(context);
            context.setLocalVariable(let.getLocalSlotNumber(), val);
            if (let.action instanceof LetExpression) {
                let = (LetExpression) let.action;
            } else {
                break;

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    public Item evaluateItem(XPathContext context) throws XPathException {
        // minimize stack consumption by evaluating nested LET expressions iteratively
        LetExpression let = this;
        while (true) {
            ValueRepresentation val = let.eval(context);
            context.setLocalVariable(let.getLocalSlotNumber(), val);
            if (let.action instanceof LetExpression) {
                let = (LetExpression) let.action;
            } else {
                break;

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    public void process(XPathContext context) throws XPathException {
        // minimize stack consumption by evaluating nested LET expressions iteratively
        LetExpression let = this;
        while (true) {
            ValueRepresentation val = let.eval(context);
            context.setLocalVariable(let.getLocalSlotNumber(), val);
            if (let.action instanceof LetExpression) {
                let = (LetExpression) let.action;
            } else {
                break;

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    public TailCall processLeavingTail(XPathContext context) throws XPathException {
        // minimize stack consumption by evaluating nested LET expressions iteratively
        LetExpression let = this;
        while (true) {
            ValueRepresentation val = let.eval(context);
            context.setLocalVariable(let.getLocalSlotNumber(), val);
            if (let.action instanceof LetExpression) {
                let = (LetExpression) let.action;
            } else {
                break;

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                // this is the "item" that will be returned by the TupleIterator.
                // In general it is actually a sequence, so we wrap it in an ObjectValue
                // It subsequently gets unwrapped by the MappingFunction applied to the
                // output of the SortedTupleIterator.
            for (int n=1; n<=comparators.length; n++) {
                ValueRepresentation v = tuple[n];
                if (v instanceof Closure) {
                    v = ((Closure)v).reduce();
                }
                if (v instanceof EmptySequence) {
                    nodeKeys[k+n] = null;

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    * only when the cardinality is zero or one. If the function is tail recursive,
    * it returns an Object representing the arguments to the next (recursive) call
    */


    public Item evaluateItem(XPathContext c) throws XPathException {
        ValueRepresentation val = callFunction(c);
        return Value.asItem(val);
    }

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    * Call the function, returning an iterator over the results. (But if the function is
    * tail recursive, it returns an iterator over the arguments of the recursive call)
    */


    public SequenceIterator iterate(XPathContext c) throws XPathException {
        ValueRepresentation result = callFunction(c);
        return Value.getIterator(result);
    }

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    public SequenceIterator iterate(XPathContext c) throws XPathException {
        return Value.getIterator(c.evaluateLocalVariable(slotNumber));
    }


    public Item evaluateItem(XPathContext c) throws XPathException {
        ValueRepresentation actual = c.evaluateLocalVariable(slotNumber);
        return Value.asItem(actual);
    }

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Related Classes of net.sf.saxon.om.ValueRepresentation

net.sf.saxon.expr.Assignation

net.sf.saxon.expr.AtomicSequenceConverter

net.sf.saxon.expr.LetExpression

net.sf.saxon.expr.SuppliedParameterReference

net.sf.saxon.expr.TailCallLoop

net.sf.saxon.expr.TailExpression

net.sf.saxon.expr.UserFunctionCall

net.sf.saxon.expr.VariableReference

net.sf.saxon.functions.PartialApply

net.sf.saxon.instruct.Assign

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