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 Item evaluateItem(XPathContext context) throws XPathException {
        // Note: these functions do not need to sort the underlying sequence,
        // but they do need to de-duplicate it
        switch (operation) {
            case COUNT:
                SequenceIterator iter = argument[0].iterate(context);
                return new IntegerValue(count(iter));
            case SUM:
                return total(argument[0].iterate(context), context);
            case AVG:
                return average(argument[0].iterate(context), context);

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    private static String getCombinedKey(Value[] params) throws XPathException {
        StringBuffer sb = new StringBuffer(120);


        for (int i = 0; i < params.length; i++) {
            Value val = params[i];
            SequenceIterator iter = val.iterate(null);
            while (true) {
                Item item = iter.next();
                if (item == null) {
                    break;
                }
                if (item instanceof NodeInfo) {
                    NodeInfo node = (NodeInfo) item;

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


    public SequenceIterator iterate(XPathContext context) throws XPathException {
        SequenceIterator iter = argument[0].iterate(context);
        Object[] info = new Object[2];
        info[0] = new HashSet();
        info[1] = getAtomicSortComparer(1, context);
        return new MappingIterator(iter, this, null, info);
    }

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        while (true) {
            Item item = population.next();
            if (item==null) {
                break;
            }
            SequenceIterator keys = keyExpression.iterate(c2);
            boolean firstKey = true;
            while (true) {
                AtomicValue key = (AtomicValue) keys.next();
                if (key==null) {
                    break;
                }
                AtomicSortComparer.ComparisonKey comparisonKey = comparer.getComparisonKey(key);
                ArrayList g = (ArrayList) index.get(comparisonKey);

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    public SequenceIterator iterate(XPathContext context) throws XPathException {
        Controller controller = context.getController();
        if (controller.isTracing()) {
            controller.getTraceListener().enter(getInstructionInfo(), context);
        }
        SequenceIterator result = child.iterate(context);
        if (controller.isTracing()) {
            controller.getTraceListener().leave(getInstructionInfo());
        }
        return result;
    }

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    * Enumerate the results of the expression
    */


    public SequenceIterator iterate(XPathContext context) throws XPathException {


        SequenceIterator iter = select.iterate(context);
        if (iter instanceof EmptyIterator) {
            return iter;
        }
        XPathContext xpc = context.newMinorContext();
        xpc.setOrigin(this);

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            return this;
        }
    }


    public SequenceIterator iterate(XPathContext context) throws XPathException {
        SequenceIterator iter = new SortedTupleIterator(context, base.iterate(context), sortKeys);
        MappingIterator mapper = new MappingIterator(iter, this, context, null);
        return mapper;
    }

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    */


    public Item evaluateItem(XPathContext context) throws XPathException {
        AtomicComparer collator = getAtomicComparer(2, context);


        SequenceIterator op1 = argument[0].iterate(context);
        SequenceIterator op2 = argument[1].iterate(context);


        Configuration config =
                (this.config!=null ? this.config : context.getController().getConfiguration());
        return BooleanValue.get(deepEquals(op1, op2, collator, config));
    }

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            return this;
        }
    }


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

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public class NamespaceForPrefix extends SystemFunction {


    public Item evaluateItem(XPathContext context) throws XPathException {
        NodeInfo element = (NodeInfo)argument[1].evaluateItem(context);
        String prefix = argument[0].evaluateItem(context).getStringValue();
        SequenceIterator nsNodes = element.iterateAxis(Axis.NAMESPACE);
        while (true) {
            NodeInfo ns = (NodeInfo)nsNodes.next();
            if (ns == null) {
                break;
            }
            if (ns.getLocalPart().equals(prefix)) {
                return new StringValue(ns.getStringValue());

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