Examples of org.pdf4j.saxon.om.ValueRepresentation

org.pdf4j.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.

        if (expression.isUpdateQuery()) {
            throw new IllegalStateException("Query is updating");
        }
        try {
            SequenceIterator iter = expression.iterator(context);
            ValueRepresentation result = SequenceExtent.makeSequenceExtent(iter);
            if (result instanceof NodeInfo) {
                return new XdmNode((NodeInfo)result);
            } else if (result instanceof AtomicValue) {
                return new XdmAtomicValue((AtomicValue)result);
            } else if (result instanceof EmptySequence) {

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     * @throws SaxonApiUncheckedException if the value is lazily evaluated and the delayed
     * evaluation fails with a dynamic error.
     */
    public XdmSequenceIterator iterator() throws SaxonApiUncheckedException {
        try {
            ValueRepresentation v = getUnderlyingValue();
            if (v instanceof Value) {
                return new XdmSequenceIterator(((Value)v).iterate());
            } else {
                return new XdmSequenceIterator(SingletonIterator.makeIterator((NodeInfo)v));
            }

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    public ValueRepresentation evaluateVariable(XPathContext context) throws XPathException {
        final Controller controller = context.getController();
        final Bindery b = controller.getBindery();


        final ValueRepresentation v = b.getGlobalVariable(getSlotNumber());


        if (v != null) {
            return v;
        } else {


            // This is the first reference to a global variable; try to evaluate it now.
            // But first set a flag to stop looping. This flag is set in the Bindery because
            // the VariableReference itself can be used by multiple threads simultaneously


            try {
                b.setExecuting(this, true);
                ValueRepresentation value = getSelectValue(context);
                b.defineGlobalVariable(this, value);
                b.setExecuting(this, false);
                return value;


            } catch (XPathException err) {

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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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    public void evaluatePendingUpdates(XPathContext context, PendingUpdateList pul) 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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Related Classes of org.pdf4j.saxon.om.ValueRepresentation

org.pdf4j.saxon.expr.Assignation

org.pdf4j.saxon.expr.AtomicSequenceConverter

org.pdf4j.saxon.expr.LetExpression

org.pdf4j.saxon.expr.SuppliedParameterReference

org.pdf4j.saxon.expr.TailCallLoop

org.pdf4j.saxon.expr.UserFunctionCall

org.pdf4j.saxon.expr.VariableReference

org.pdf4j.saxon.instruct.Assign

org.pdf4j.saxon.instruct.GlobalParam

org.pdf4j.saxon.instruct.GlobalVariable

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