Examples of net.sf.saxon.value.Value

net.sf.saxon.value.Value
A value is the result of an expression but it is also an expression in its own right. Note that every value can be regarded as a sequence - in many cases, a sequence of length one.

    public XQResultSequence executeQuery() throws XQException {
        checkNotClosed();
        try {
            SequenceIterator iter = expression.iterator(context);
            if (scrollable) {
                Value value = Value.asValue(SequenceExtent.makeSequenceExtent(iter));
                return new SaxonXQSequence(value, this);
            } else {
                return new SaxonXQForwardSequence(iter, this);
            }
        } catch (XPathException de) {

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        return last != null && last.markTailCalls();
    }


    public Expression compile(Executable exec) throws XPathException {
        if (test instanceof Literal) {
            Value testVal = ((Literal)test).getValue();
            // condition known statically, so we only need compile the code if true.
            // This can happen with expressions such as test="function-available('abc')".
            try {
                if (testVal.effectiveBooleanValue()) {
                    return compileSequenceConstructor(exec, iterateAxis(Axis.CHILD), true);
//                    Block block = new Block();
//                    block.setLocationId(allocateLocationId(getSystemId(), getLineNumber()));
//                    compileChildren(exec, block, true);
//                    return block.simplify(getStaticContext());

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                result = item;
            } else if (item instanceof FunctionItem) {
                typeError("A function item cannot appear as the " +
                        role.getMessage(), "FOTY0013", context);
            } else {
                Value value = ((NodeInfo)item).atomize();
                found += value.getLength();
                if (found > 1) {
                     typeError(
                        "A sequence of more than one item is not allowed as the " +
                        role.getMessage(), role.getErrorCode(), context);
                }
                result = value.itemAt(0);
            }
        }
        if (found == 0 && !allowEmpty) {
            typeError("An empty sequence is not allowed as the " +
                             role.getMessage(), role.getErrorCode(), null);

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     */


    private void preEvaluateCollation(StaticContext env) throws XPathException {
        if (getNumberOfArguments() == getDetails().maxArguments) {
            final Expression collationExp = argument[getNumberOfArguments() - 1];
            final Value collationVal = (collationExp instanceof Literal ? ((Literal)collationExp).getValue() : null);
            if (collationVal instanceof AtomicValue) {
                // Collation is supplied as a constant
                String collationName = collationVal.getStringValue();
                URI collationURI;
                try {
                    collationURI = new URI(collationName);
                    if (!collationURI.isAbsolute()) {
                        saveBaseURI(env, true);

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    public SequenceIterator iterate(XPathContext context) throws XPathException {
        Controller controller = context.getController();
        if (controller.isTracing()) {
            String label = argument[1].evaluateAsString(context).toString();
            Value value = Value.asValue(ExpressionTool.eagerEvaluate(argument[0], context));
            notifyListener(label, value, context);
            return value.iterate();
        } else {
            PrintStream out = controller.getTraceFunctionDestination();
            if (out == null) {
                return argument[0].iterate(context);
            } else {

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    protected SequenceIterator call(ValueRepresentation[] argValues, XPathContext context) throws XPathException {
        List convertedArgs = new ArrayList(argValues.length);
        Configuration config = context.getConfiguration();
        for (int i=0; i<argValues.length; i++) {
            Value actual = Value.asValue(argValues[i]).reduce();
            PJConverter converter = PJConverter.allocate(
                    config, actual.getItemType(config.getTypeHierarchy()), actual.getCardinality(), Object.class);
            convertedArgs.add(converter.convert(actual, Object.class, context));
        }
        try {
            Object result = function.evaluate(convertedArgs);
            if (result == null) {

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                    results = null;
                }
            }
            // Avoid calling next() to materialize the NodeInfo object
            if (base.moveNext()) {
                Value atomized = base.atomize();
                if (atomized instanceof AtomicValue) {
                    // common case (the atomized value of the node is a single atomic value)
                    results = null;
                    nextItem = (AtomicValue)atomized;
                    break;
                } else {
                    results = atomized.iterate();
                    nextItem = (AtomicValue)results.next();
                    if (nextItem == null) {
                        results = null;
                    } else {
                        break;

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        final Controller controller = exp1.getController();
        final Value[] arglist = new Value[2];
        arglist[0] = new IntegerValue(10);
        for (int i=3; i<10; i++) {
            arglist[1] = new IntegerValue(i);
            final Value result = fn1.call(arglist, controller);
            System.out.println(arglist[0] + " div " + arglist[1] + " = " + result);
        }
    }

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            // the VariableReference itself can be used by multiple threads simultaneously


            try {
                b.setExecuting(this, true);
                //XPathContext c2 = context.newCleanContext();
                Value value = getSelectValue(context);
                b.defineGlobalVariable(this, value);
                b.setExecuting(this, false);
                return value;


            } catch (XPathException err) {

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    public void fixupReferences() throws TransformerConfigurationException {
        SequenceType type = getRequiredType();
        Iterator iter = references.iterator();
        while (iter.hasNext()) {
            Value constantValue = null;
            int properties = 0;
            if (this instanceof XSLVariable && !isAssignable()) {
                if (select instanceof Value) {
                    // we can't rely on the constant value because it hasn't yet been type-checked,
                    // which could change it (eg by numeric promotion). Rather than attempt all the type-checking

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Related Classes of net.sf.saxon.value.Value

net.sf.saxon.Configuration

net.sf.saxon.Controller

net.sf.saxon.event.Builder

net.sf.saxon.event.PipelineConfiguration

net.sf.saxon.event.Sender

net.sf.saxon.event.SequenceReceiver

net.sf.saxon.expr.Atomizer

net.sf.saxon.expr.AxisAtomizingIterator

net.sf.saxon.expr.BinaryExpression

net.sf.saxon.expr.CastableExpression

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