Examples of org.pdf4j.saxon.om.Item

org.pdf4j.saxon.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

    /**
    * Evaluate the expression
    */


    public Item evaluateItem(XPathContext context) throws XPathException {
        Item item = context.getContextItem();
        if (item==null) {
            dynamicError("The context item is not set", getErrorCodeForUndefinedContext(), context);
        }
        return item;
    }

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                // this provides the context for evaluating the sort key


        // initialise the array with data


        while (true) {
            Item item = base.next();
            if (item == null) {
                break;
            }
            if (count==allocated) {
                allocated *= 2;

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    public boolean effectiveBooleanValue(XPathContext context) throws XPathException {
        int count = 0;
        SequenceIterator iter = operand.iterate(context);
        while (true) {
            Item item = iter.next();
            if (item == null) {
                break;
            }
            if (item instanceof NodeInfo) {
                Value atomizedValue = ((NodeInfo)item).atomize();

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    /**
    * Evaluate as an Item. This should only be called if the AtomicSequenceConverter has cardinality zero-or-one
    */


    public Item evaluateItem(XPathContext context) throws XPathException {
        Item item = operand.evaluateItem(context);
        if (item==null) return null;
        return ((AtomicValue)item).convert(requiredPrimitiveType, true, context).asAtomic();
    }

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        } else if (value instanceof AtomicValue) {
            return StaticProperty.EXACTLY_ONE;
        }
        try {
            SequenceIterator iter = value.iterate();
            Item next = iter.next();
            if (next == null) {
                return StaticProperty.EMPTY;
            } else {
                if (iter.next() != null) {
                    return StaticProperty.ALLOWS_ONE_OR_MORE;

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    public void process(XPathContext context) throws XPathException {
        SequenceIterator iter = value.iterate();
        SequenceReceiver out = context.getReceiver();
        while (true) {
            Item it = iter.next();
            if (it==null) break;
            out.append(it, 0, NodeInfo.ALL_NAMESPACES);
        }
    }

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            try {
                out.emitAttribute("count", value.getLength()+"");
                if (value.getLength() < 20) {
                    SequenceIterator iter = iterate(null);
                    while (true) {
                        Item it = iter.next();
                        if (it == null) {
                            break;
                        }
                        if (it instanceof NodeInfo) {
                            out.startElement("node");
                            out.emitAttribute("path", Navigator.getPath(((NodeInfo)it)));
                            out.emitAttribute("uri", ((NodeInfo)it).getSystemId());
                            out.endElement();
                        } else {
                            out.startElement("atomicValue");
                            out.emitAttribute("value", it.getStringValue());
                            out.emitAttribute("type", ((AtomicValue)it).getTypeLabel().getDisplayName());
                            out.endElement();
                        }
                    }
                }

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     * it throws a type error if the underlying sequence is multi-valued.
    */


    public Item evaluateItem(XPathContext context) throws XPathException {
        int found = 0;
        Item result = null;
        SequenceIterator iter = operand.iterate(context);
        while (true) {
            Item item = iter.next();
            if (item == null) {
                break;
            }
            if (item instanceof AtomicValue) {
                if (found++ > 0) {

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    public boolean effectiveBooleanValue(XPathContext context) throws XPathException {
        SequenceIterator iter = operand.iterate(context);
        int count = 0;
        while (true) {
            Item item = iter.next();
            if (item == null) break;
            count++;
            if (!targetType.matchesItem(item, false, context.getConfiguration())) {
                return false;
            }

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        this.action = action;
        this.context = context;
    }


    public Item next() throws XPathException {
        Item nextItem;
        while (true) {
            if (stepIterator != null) {
                nextItem = stepIterator.next();
                if (nextItem != null) {
                    break;

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Related Classes of org.pdf4j.saxon.om.Item

org.pdf4j.saxon.dom.DOMNodeList

org.pdf4j.saxon.event.SequenceCopier

org.pdf4j.saxon.evpull.EventMappingIterator

org.pdf4j.saxon.expr.AppendIterator

org.pdf4j.saxon.expr.AtomicSequenceConverter

org.pdf4j.saxon.expr.CardinalityChecker

org.pdf4j.saxon.expr.CastableExpression

org.pdf4j.saxon.expr.ContextItemExpression

org.pdf4j.saxon.expr.ContextMappingIterator

org.pdf4j.saxon.expr.EveryItemMappingIterator

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