Examples of net.sf.saxon.om.SequenceIterator

net.sf.saxon.om.SequenceIterator
A SequenceIterator is used to iterate over any XPath 2 sequence (of values or nodes). To get the next item in a sequence, call next(); if this returns null, you've reached the end of the sequence.
A SequenceIterator keeps track of the current Item and the current position. The objects returned by the SequenceIterator will always be either nodes (class NodeInfo) or singleton values (class AtomicValue): these are represented collectively by the interface Item.
This interface forms part of the public Saxon API. The JavaDoc "since" flag is used from release 8.4 onwards to indicate methods that are considered to be a stable part of the API. Methods without a "since" flag should not be regarded as a stable part of the API.
Note that the stability of this interface applies to classes that use the interface, not to classes that implement it. The interface may be extended in future to add new methods. @author Michael H. Kay @since 8.4

    public int hashCode() {
        return base.hashCode();
    }


    public SequenceIterator iterate(XPathContext context) throws XPathException {
        SequenceIterator baseIter = base.iterate(context);
        if ((baseIter.getProperties() & SequenceIterator.GROUNDED) != 0) {
            return new ValueTailIterator(((GroundedIterator)baseIter).materialize(), start - 1);
        } else {
            return TailIterator.make(baseIter, start);
        }
    }

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     * items in the sequence are wrappers around DOM Nodes
    */


    public static DOMNodeList checkAndMake(SequenceExtent extent) throws XPathException {
        // NOTE: method currently unused
        SequenceIterator it = extent.iterate();
        List<Node> list = new ArrayList<Node>(extent.getLength());
        while (true) {
            Item next = it.next();
            if (next==null) break;
            Object o = next;
            if (!(o instanceof NodeInfo)) {
                throw new XPathException("Supplied sequence contains an item that is not a Saxon NodeInfo");
            }

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    /**
    * Iterate over the sequence of values
    */


    public SequenceIterator iterate(XPathContext context) throws XPathException {
        SequenceIterator base = operand.iterate(context);
        return getMappingIterator(base, context);
    }

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    /**
    * Iterate over the sequence of values
    */


    public SequenceIterator iterate(final XPathContext context) throws XPathException {
        SequenceIterator base = operand.iterate(context);
        ItemMappingFunction promoter = new ItemMappingFunction() {
            public Item map(Item item) throws XPathException {
                return promote(((AtomicValue)item), context);
            }
        };

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     * @param context the XPath dynamic context
     * @return a list of items representing the result of the expression
     */


    public List evaluate(XPathDynamicContext context) throws XPathException {
        SequenceIterator iter = expression.iterate(context.getXPathContextObject());
        List list = new ArrayList(20);
        while (true) {
            Item item = iter.next();
            if (item == null) {
                break;
            }
            list.add(item);
        }

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            origin = (NodeInfo)source;
        } else {
            origin = evaluator.getConfiguration().buildDocument(source);
        }
        XPathDynamicContext dynamicContext = createDynamicContext(origin);
        SequenceIterator iter = iterate(dynamicContext);
        SequenceExtent extent = new SequenceExtent(iter);
        //List result = (List)extent.convertToJava(List.class, dynamicContext.getXPathContextObject());
        List result = (List)PJConverter.ToCollection.INSTANCE.convert(
                extent, List.class, dynamicContext.getXPathContextObject());
        if (result == null) {

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            origin = (NodeInfo)source;
        } else {
            origin = evaluator.getConfiguration().buildDocument(source);
        }
        XPathDynamicContext context = createDynamicContext(origin);
        SequenceIterator iterator = iterate(context);
        Item item = iterator.next();
        if (item == null) {
            return null;
        } else {
            return Value.convertToJava(item);
        }

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        } else {
            href = argument[0].evaluateItem(context).getStringValue();
        }


        CollectionURIResolver resolver = context.getConfiguration().getCollectionURIResolver();
        SequenceIterator iter;
        try {
            iter = resolver.resolve(href, expressionBaseURI, context);
        } catch (XPathException e) {
            e.setLocator(this);
            throw e;

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    * Evaluate the function to return an iteration of selected nodes.
    */


    public SequenceIterator iterate(XPathContext context) throws XPathException {
        GenericAtomicComparer comparer = getAtomicComparer(2, context);
        SequenceIterator seq = argument[0].iterate(context);
        AtomicValue val = (AtomicValue)argument[1].evaluateItem(context);
        return new IndexIterator(seq, val, comparer);
    }

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            return baseProps;
        }
    }


    public SequenceIterator iterate(XPathContext context) throws XPathException {
        SequenceIterator forwards = argument[0].iterate(context);
        if (forwards instanceof ReversibleIterator) {
            return ((ReversibleIterator)forwards).getReverseIterator();
        } else {
            SequenceExtent extent = new SequenceExtent(forwards);
            return extent.reverseIterate();

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Related Classes of net.sf.saxon.om.SequenceIterator

net.sf.saxon.dom.DOMNodeList

net.sf.saxon.evpull.Decomposer

net.sf.saxon.expr.AtomicMappingExpression

net.sf.saxon.expr.AtomicSequenceConverter

net.sf.saxon.expr.CardinalityChecker

net.sf.saxon.expr.CastableExpression

net.sf.saxon.expr.ComputedExpression

net.sf.saxon.expr.ContextMappingIterator

net.sf.saxon.expr.ConvertToString

net.sf.saxon.expr.FilterExpression

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