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

        int pslot = -1;
        if (positionVariable != null) {
            pslot = positionVariable.getLocalSlotNumber();
        }
        while (true) {
            Item item = iter.next();
            if (item == null) break;
            context.setLocalVariable(slot, item);
            if (pslot >= 0) {
                context.setLocalVariable(pslot, Int64Value.makeIntegerValue(position++));
            }

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        int pslot = -1;
        if (positionVariable != null) {
            pslot = positionVariable.getLocalSlotNumber();
        }
        while (true) {
            Item item = iter.next();
            if (item == null) break;
            context.setLocalVariable(slot, item);
            if (pslot >= 0) {
                context.setLocalVariable(pslot, Int64Value.makeIntegerValue(position++));
            }

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        // logic is used for the SOME and EVERY operators


        final boolean some = (operator==Token.SOME);
        int slot = getLocalSlotNumber();
        while (true) {
            final Item it = base.next();
            if (it == null) {
                break;
            }
            context.setLocalVariable(slot, it);
            if (some == action.effectiveBooleanValue(context)) {

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     * @return the next item that matches the predicate
    */


    protected Item getNextMatchingItem() throws XPathException {
        while (true) {
            Item next = base.next();
            if (next == null) {
                return null;
            }
            if (matches()) {
                return next;

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        // The code is almost identical to the code in ExpressionTool#effectiveBooleanValue
        // except for the handling of a numeric result


        SequenceIterator iterator = filter.iterate(filterContext);
        Item first = iterator.next();
        if (first == null) {
            return false;
        }
        if (first instanceof NodeInfo) {
            return true;
        } else {
            if (first instanceof BooleanValue) {
                if (iterator.next() != null) {
                    ExpressionTool.ebvError("sequence of two or more items starting with a boolean");
                }
                return ((BooleanValue)first).getBooleanValue();
            } else if (first instanceof StringValue) {
                if (iterator.next() != null) {
                    ExpressionTool.ebvError("sequence of two or more items starting with a string");
                }
                return (first.getStringValueCS().length()!=0);
            } else if (first instanceof Int64Value) {
                if (iterator.next() != null) {
                    ExpressionTool.ebvError("sequence of two or more items starting with a numeric value");
                }
                return ((Int64Value)first).longValue() == base.position();

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        /**
        * Get the next node that matches the filter predicate if there is one
        */


        protected Item getNextMatchingItem() throws XPathException {
            Item next = base.next();
            if (next == null) {
                return null;
            }
            if (matches()) {
                return next;

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    */


    public Item evaluateItem(XPathContext context) throws XPathException {
        final XPathContextMajor cm = (XPathContextMajor)context;
        while (true) {
            Item item = operand.evaluateItem(context);
            UserFunction fn = cm.getTailCallFunction();
            if (fn == null) {
               return item;
            }
            if (fn != containingFunction) {

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    public Item evaluateItem(XPathContext context) throws XPathException {
        SequenceIterator forwards = operand.iterate(context);
        if (forwards instanceof ReversibleIterator) {
            return ((ReversibleIterator)forwards).getReverseIterator().next();
        } else {
            Item current = null;
            while (true) {
                Item item = forwards.next();
                if (item == null) {
                    return current;
                }
                current = item;
            }

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    * @return the NodeInfo of the first selected element, or null if no element
    * is selected
    */


    public NodeInfo getNode(XPathContext context) throws XPathException {
        Item current = context.getContextItem();
        if (current==null) {
            dynamicError("Finding root of tree: the context item is undefined", "XPDY0002", context);
        }
        if (current instanceof NodeInfo) {
            DocumentInfo doc = ((NodeInfo)current).getDocumentRoot();

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        c2.setCurrentTemplateRule(null);


        if (containsTailCall) {
            if (controller.isTracing()) {
                TraceListener listener = controller.getTraceListener();
                Item item = iter.next();
                if (item == null) {
                    return null;
                }
                listener.startCurrentItem(item);
                TailCall tc = ((TailCallReturner)action).processLeavingTail(c2);
                listener.endCurrentItem(item);
                return tc;
            } else {
                Item item = iter.next();
                if (item == null) {
                    return null;
                }
                return ((TailCallReturner)action).processLeavingTail(c2);
            }
        } else {
            if (controller.isTracing()) {
                TraceListener listener = controller.getTraceListener();
                while(true) {
                    Item item = iter.next();
                    if (item == null) {
                        break;
                    }
                    listener.startCurrentItem(item);
                    action.process(c2);
                    listener.endCurrentItem(item);
                }
            } else {
                while(true) {
                    Item item = iter.next();
                    if (item == null) {
                        break;
                    }
                    action.process(c2);
                }

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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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