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 as an Item.
    */


    public Item evaluateItem(XPathContext context) throws XPathException {
        Item item = operand.evaluateItem(context);
        if (item==null) return null;
        testConformance(item, context);
        return item;
    }

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


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

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        c2.setCurrentIterator(iter);
        c2.setCurrentTemplateRule(null);


        // TODO: add tracing as in xsl:for-each
        while (true) {
            Item item = iter.next();
            if (item == null) {
                if (action instanceof Block) {
                    c2.setCurrentIterator(null);
                    ((Block)action).processLocalParams(c2);
                }

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


    public Item evaluateItem(XPathContext context) throws XPathException {
        Item item = operand.evaluateItem(context);
        if (item == null) {
            return null;
        }
        if (item instanceof UntypedAtomicValue) {
            ConversionResult val = ((UntypedAtomicValue)item).convert(requiredItemType, true, context);

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


    public Item next() throws XPathException {
        Item nextSource = base.next();
        if (nextSource == null) {
            current = null;
            return null;
        }
        // Call the supplied mapping function

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        result = new ContextMappingIterator(this, context2);


        // Peek at the first item, and depending on its type, check that all the items
        // are atomic values or that all are nodes.
        final SourceLocator loc = this;
        Item first = result.next();
        if (first == null) {
            return EmptyIterator.getInstance();
        } else if (first instanceof AtomicValue) {
            ItemMappingFunction atomicValueChecker = new ItemMappingFunction() {
                public Item map(Item item) throws XPathException {

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        try {
            FastStringBuffer sb = new FastStringBuffer(100);
            int count = 0;
            sb.append(" (");
            while (true) {
                Item next = seq.next();
                if (next == null) {
                    sb.append(") ");
                    return sb.toString();
                }
                if (count++ > 0) {

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    * Evaluate as an Item.
    */


    public Item evaluateItem(XPathContext context) throws XPathException {
        SequenceIterator iter = operand.iterate(context);
        Item item = null;
        while (true) {
            Item nextItem = iter.next();
            if (nextItem == null) break;
            if (requiredCardinality == StaticProperty.EMPTY) {
                typeError("An empty sequence is required as the " +
                    role.getMessage(), role.getErrorCode(), context);
                return null;

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        final Configuration config = context.getConfiguration();
        final TypeHierarchy th = config.getTypeHierarchy();
        SequenceIterator iter = Value.asIterator(val);
        int count = 0;
        while (true) {
            Item item = iter.next();
            if (item == null) {
                break;
            }
            count++;
            if (!reqItemType.matchesItem(item, false, config)) {

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    /**
    * Iterate over the value of the expression
    */


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

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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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