Examples of client.net.sf.saxon.ce.om.SequenceIterator

client.net.sf.saxon.ce.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 itemAt(int n) throws XPathException {
        if (n < 0) {
            return null;
        }
        int i = 0;        // indexing is zero-based
        SequenceIterator iter = iterate();
        while (true) {
            Item item = iter.next();
            if (item == null) {
                return null;
            }
            if (i++ == n) {
                return item;

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      * @param context The dynamic context, giving access to the current node,
      * the current variables, etc.
      */


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

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     * No failure is possible in the case of an AtomicValue.
     */


    public String getStringValue() throws XPathException {
        FastStringBuffer sb = new FastStringBuffer(FastStringBuffer.SMALL);
        SequenceIterator iter = iterate();
        Item item = iter.next();
        if (item != null) {
            while (true) {
                sb.append(item.getStringValueCS());
                item = iter.next();
                if (item == null) {
                    break;
                }
                sb.append(' ');
            }

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                        ParameterSet tunnelParams, XPathContext context,
                        SourceLocator sourceLocator) throws XPathException {
        switch(node.getNodeKind()) {
            case Type.DOCUMENT:
            case Type.ELEMENT:
                SequenceIterator iter = node.iterateAxis(Axis.CHILD);
                XPathContextMajor c2 = context.newContext();
              TailCall tc = ApplyTemplates.applyTemplates(
                        iter, context.getCurrentMode(), parameters, tunnelParams, c2, sourceLocator);
                while (tc != null) {
                    tc = tc.processLeavingTail();

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        }
    }
    
    private static JavaScriptObject convertSequenceToArray(ValueRepresentation val, int seqLength) throws XPathException {
        JavaScriptObject jsItems = jsArray(seqLength);
        SequenceIterator iterator = Value.getIterator(val);
        int i = 0;
        while (true) {
            Item item = iterator.next();
            if (item == null) {
                break;
            }
            Object jsObject = convertToJavaScript(item);
            jsSetArrayItem(jsItems, i, jsObject);

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    public AtomicValue getCurrentGroupingKey() {
        return (AtomicValue)nodeKeys[(position-1)*recordSize+comparators.length+2];
    }


    public SequenceIterator iterateCurrentGroup() throws XPathException {
        SequenceIterator iter =
                (SequenceIterator)nodeKeys[(position-1)*recordSize+comparators.length+3];
        return iter.getAnother();
    }

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        if (operand instanceof Literal) {
            Value val = ((Literal)operand).getValue();
            if (val instanceof AtomicValue) {
                return operand;
            }
            SequenceIterator iter = val.iterate();
            while (true) {
                // if all items in the sequence are atomic (they generally will be, since this is
                // done at compile time), then return the sequence
                Item i = iter.next();
                if (i == null) {
                    return operand;
                }
                if (i instanceof NodeInfo) {
                    return this;

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


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

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    */


    public SequenceIterator iterate(XPathContext context) throws XPathException {
        final XPathContextMajor cm = (XPathContextMajor)context;
        while (true) {
            SequenceIterator iter = operand.iterate(cm);
            ValueRepresentation extent = SequenceExtent.makeSequenceExtent(iter);
            UserFunction fn = cm.getTailCallFunction();
            if (fn == null) {
                return Value.asIterator(extent);
            }

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        // Then create a MappingIterator which applies a mapping function to each
        // item in the base sequence. The mapping function is essentially the "return"
        // expression, wrapped in a MappingAction object that is responsible also for
        // setting the range variable at each step.


        SequenceIterator base = sequence.iterate(context);
        int pslot = -1;
        MappingAction map = new MappingAction(context, getLocalSlotNumber(), pslot, action);
        switch (actionCardinality) {
            case StaticProperty.EXACTLY_ONE:
                return new ItemMappingIterator(base, map, true);

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client.net.sf.saxon.ce.expr.AdjacentTextNodeMerger

client.net.sf.saxon.ce.expr.AtomicSequenceConverter

client.net.sf.saxon.ce.expr.Atomizer

client.net.sf.saxon.ce.expr.CardinalityChecker

client.net.sf.saxon.ce.expr.CastableExpression

client.net.sf.saxon.ce.expr.ContextMappingIterator

client.net.sf.saxon.ce.expr.Expression

client.net.sf.saxon.ce.expr.FilterExpression

client.net.sf.saxon.ce.expr.FilterIterator

client.net.sf.saxon.ce.expr.FirstItemExpression

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