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 Expression simplify(ExpressionVisitor visitor) throws XPathException {
        operand = visitor.simplify(operand);
        if (operand instanceof Literal) {
            ValueRepresentation val = SequenceExtent.makeSequenceExtent(
                    iterate(visitor.getStaticContext().makeEarlyEvaluationContext()));
            return Literal.makeLiteral(Value.asValue(val));
        }
        return this;
    }

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    /**
    * Get the value of the range variable
    */


    public ValueRepresentation evaluateVariable(XPathContext context) throws XPathException {
        ValueRepresentation actual = context.evaluateLocalVariable(slotNumber);
        if (actual instanceof MemoClosure && ((MemoClosure)actual).isFullyRead()) {
            actual = ((MemoClosure)actual).materialize();
            context.setLocalVariable(slotNumber, actual);
        }
        return actual;

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     * @return An <code>XdmValue</code> representing the results of the expression.
     * @throws SaxonApiException if a dynamic error occurs during the expression evaluation.
     */


    public XdmValue evaluate() throws SaxonApiException {
        ValueRepresentation value;
        try {
            value = SequenceExtent.makeSequenceExtent(exp.iterate(dynamicContext));
        } catch (XPathException e) {
            throw new SaxonApiException(e);
        }

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        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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    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);
                if (indexed) {
                    value = controller.getConfiguration().getOptimizer().makeIndexedValue(Value.asIterator(value));
                }
                b.defineGlobalVariable(this, value);
                b.setExecuting(this, false);

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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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    /**
    * Get the value of the range variable
    */


    public ValueRepresentation evaluateVariable(XPathContext context) throws XPathException {
        ValueRepresentation actual = context.evaluateLocalVariable(slotNumber);
        if (actual instanceof MemoClosure && ((MemoClosure)actual).isFullyRead()) {
            actual = ((MemoClosure)actual).materialize();
            context.setLocalVariable(slotNumber, actual);
        }
        return actual;

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     * @return An <code>XdmValue</code> representing the results of the expression.
     * @throws SaxonApiException if a dynamic error occurs during the expression evaluation.
     */


    public XdmValue evaluate() throws SaxonApiException {
        ValueRepresentation value;
        try {
            value = SequenceExtent.makeSequenceExtent(exp.iterate(dynamicContext));
        } catch (XPathException e) {
            throw new SaxonApiException(e);
        }

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        } catch (XPathException e) {
            e.setLocator(this);
            throw e;
        }


        ValueRepresentation val = b.getGlobalVariableValue(this);
        if (wasSupplied || val!=null) {
            return val;
        } else {
            if (isRequiredParam()) {
                XPathException e = new XPathException("No value supplied for required parameter $" +
                        getVariableQName().getDisplayName());
                e.setXPathContext(context);
                e.setLocator(getSourceLocator());
                e.setErrorCode(isXSLT() ? "XTDE0050" : "XPDY0002");
                throw e;
            } else if (isImplicitlyRequiredParam()) {
                XPathException e = new XPathException("A value must be supplied for parameter $" +
                        getVariableQName().getDisplayName() +
                        " because there is no default value for the required type");
                e.setXPathContext(context);
                e.setLocator(getSourceLocator());
                e.setErrorCode("XTDE0610");
                throw e;
            }


            // 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 XdmValue evaluate() throws SaxonApiException {
        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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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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