Examples of client.net.sf.saxon.ce.om.Item

client.net.sf.saxon.ce.om.Item
An Item is an object that can occur as a member of a sequence. It corresponds directly to the concept of an item in the XPath 2.0 data model. There are two kinds of Item: atomic values, and nodes.
This interface is part of the public Saxon API. As such (starting from Saxon 8.4), methods that form part of the stable API are labelled with a JavaDoc "since" tag to identify the Saxon release at which they were introduced.
Note: there is no method getItemType(). This is to avoid having to implement it on every implementation of NodeInfo. Instead, use the static method Type.getItemType(Item). @author Michael H. Kay @since 8.4


    public GroundedValue materialize() {
        if (length == 0) {
            return EmptySequence.getInstance();
        } else if (length == 1) {
            Item item = (Item)list.get(0);
            if (item instanceof NodeInfo) {
                return new SingletonItem((NodeInfo)item);
            } else {
                return (AtomicValue)item;
            }

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    private void advance() throws XPathException {
        currentMembers = new ArrayList(20);
        currentMembers.add(current);
        while (true) {
            Item nextCandidate = population.next();
            if (nextCandidate == null) {
                break;
            }
            AtomicValue candidateKey =
                    (AtomicValue)keyExpression.evaluateItem(runningContext);

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    public Item next() {
        if (position == 0) {
            position = 1;
            return start;
        }
        Item n = base.next();
        if (n == null) {
            position = -1;
        } else {
            position++;
        }

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     *     expression; or null to indicate that the result is an empty
     *     sequence
     */


    public Item evaluateItem(XPathContext context) throws XPathException {
      Item result;
      if (LogConfiguration.loggingIsEnabled() && LogController.traceIsEnabled()) {
        LogController.getTraceListener().enter(getInstructionInfo(), context);
        result = child.evaluateItem(context);
        LogController.getTraceListener().leave(getInstructionInfo());
      } else {

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        if (length == 0 && !Cardinality.allowsZero(cardinality)) {
            return false;
        }
        SequenceIterator iter = value.iterate();
        while (true) {
            Item item = iter.next();
            if (item == null) {
                return true;
            }
            if (!primaryType.matchesItem(item, false, config)) {
                return false;

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        this.base = base;
        this.action = action;
    }


    public Item next() throws XPathException {
        Item nextItem;
        while (true) {
            if (results != null) {
                nextItem = results.next();
                if (nextItem != null) {
                    break;
                } else {
                    results = null;
                }
            }
            Item nextSource = base.next();
            if (nextSource != null) {
                // Call the supplied mapping function
                SequenceIterator obj = action.map(nextSource);


                // The result may be null (representing an empty sequence),

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    /**
    * Evaluate in a general context
    */


    public Item evaluateItem(XPathContext context) throws XPathException {
        Item arg0 = argument[0].evaluateItem(context);
        if (arg0==null) {
            return DoubleValue.NaN;
        }
        if (arg0 instanceof BooleanValue || arg0 instanceof NumericValue) {
            ConversionResult result = ((AtomicValue)arg0).convert(BuiltInAtomicType.DOUBLE, true);
            if (result instanceof ValidationFailure) {
                return DoubleValue.NaN;
            } else {
                return (AtomicValue)result;
            }
        }
        if (arg0 instanceof StringValue && !(arg0 instanceof AnyURIValue)) {
            CharSequence s = arg0.getStringValueCS();
            try {
                return new DoubleValue(StringToDouble.stringToNumber(s));
            } catch (NumberFormatException e) {
                return DoubleValue.NaN;
            }

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    public StringToCodepoints newInstance() {
        return new StringToCodepoints();
    }


    public SequenceIterator iterate(XPathContext c) throws XPathException {
        Item item = argument[0].evaluateItem(c);
        if (item==null) {
            return EmptyIterator.getInstance();
        }
        int[] chars = ((StringValue)item).expand();
        IntegerValue[] codes = new IntegerValue[chars.length];

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    * Evaluate in a general context
    */


    public Item evaluateItem(XPathContext c) throws XPathException {
        if (argument.length == 0) {
            Item item = c.getContextItem();
            if (item == null) {
                dynamicError("Context item for normalize-space() is undefined", "FONC0001", c);
                return null;
            }
            return StringValue.makeStringValue(
                    Whitespace.collapseWhitespace(item.getStringValueCS()));
        } else {
            AtomicValue sv = (AtomicValue)argument[0].evaluateItem(c);
            if (sv==null) {
                return StringValue.EMPTY_STRING;
            }

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     */


    public boolean effectiveBooleanValue(XPathContext c) throws XPathException {
        CharSequence cs;
        if (argument.length == 0) {
            Item item = c.getContextItem();
            if (item == null) {
                dynamicError("Context item for normalize-space() is undefined", "FONC0001", c);
                return false;
            }
            cs = item.getStringValueCS();
        } else {
            AtomicValue sv = (AtomicValue)argument[0].evaluateItem(c);
            if (sv==null) {
                return false;
            }

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Related Classes of client.net.sf.saxon.ce.om.Item

client.net.sf.saxon.ce.expr.AdjacentTextNodeMerger

client.net.sf.saxon.ce.expr.AtomicSequenceConverter

client.net.sf.saxon.ce.expr.Atomizer

client.net.sf.saxon.ce.expr.CardinalityChecker

client.net.sf.saxon.ce.expr.CastableExpression

client.net.sf.saxon.ce.expr.ContextItemExpression

client.net.sf.saxon.ce.expr.ContextMappingIterator

client.net.sf.saxon.ce.expr.Expression

client.net.sf.saxon.ce.expr.FilterIterator

client.net.sf.saxon.ce.expr.ForExpression

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