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 XdmValue evaluate() throws SaxonApiException {
        if (expression.isUpdateQuery()) {
            throw new IllegalStateException("Query is updating");
        }
        try {
            SequenceIterator iter = expression.iterator(context);
            ValueRepresentation result = SequenceExtent.makeSequenceExtent(iter);
            if (result instanceof NodeInfo) {
                return new XdmNode((NodeInfo)result);
            } else if (result instanceof AtomicValue) {
                return new XdmAtomicValue((AtomicValue)result);

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     */




    public XdmItem evaluateSingle() throws SaxonApiException {
        try {
            SequenceIterator iter = expression.iterator(context);
            return (XdmItem) XdmValue.wrap(iter.next());
        } catch (XPathException e) {
            throw new SaxonApiException(e);
        }
    }

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        final Configuration config = new Configuration();
        final StaticQueryContext sqc = new StaticQueryContext(config);
        final XQueryExpression exp = sqc.compileQuery("for $i in 1 to 10 return ($i * $i)");


        final DynamicQueryContext dynamicContext = new DynamicQueryContext(config);
        final SequenceIterator iter = exp.iterator(dynamicContext);
        while (true) {
            Item item = iter.next();
            if (item == null) {
                break;
            }
            System.out.println(item.getStringValue());
        }

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                "<doc><chap><a>3</a></chap></doc>//a, <b>4</b>, attribute c {5}, 19");
        Properties props = new Properties();
        props.setProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");


        final DynamicQueryContext dynamicContext = new DynamicQueryContext(config);
        final SequenceIterator iter = exp.iterator(dynamicContext);
        QueryResult.serializeSequence(iter, config, System.out, props);
    }

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        Properties props = new Properties();
        props.setProperty(OutputKeys.OMIT_XML_DECLARATION, "no");
        props.setProperty(OutputKeys.INDENT, "yes");


        final DynamicQueryContext dynamicContext = new DynamicQueryContext(config);
        final SequenceIterator iter = exp.iterator(dynamicContext);
        final DocumentInfo doc = QueryResult.wrap(iter, config);
        QueryResult.serialize(doc, new StreamResult(System.out), props, config);
    }

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    * For the types of Java object that may be returned, see the description of the evaluate method
    * of class XPathProcessor
    */


    public List evaluate() throws XPathException {
        SequenceIterator iterator = rawIterator();
        ArrayList list = new ArrayList();
        while (true) {
            Item item = iterator.next();
            if (item == null) {
                return list;
            }
            list.add(XPathEvaluator.convert(item));
        }

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    */


    public Object evaluateSingle() throws XPathException {
        XPathContextMajor context = new XPathContextMajor(contextNode, configuration);
        context.openStackFrame(stackFrameMap);
        SequenceIterator iterator = expression.iterate(context);
        Item item = iterator.next();
        if (item == null) {
            return null;
        } else {
            return XPathEvaluator.convert(item);
        }

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    */


    public SequenceIterator rawIterator() throws XPathException {
        XPathContextMajor context = new XPathContextMajor(contextNode, configuration);
        context.openStackFrame(stackFrameMap);
        SequenceIterator iterator = expression.iterate(context);
        if (sortKey != null) {
            Expression key = sortKey.expression;
            if (key.getItemType() instanceof NodeTest) {
                key = new Atomizer(key);
            }

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            }
            c.savedXPathContext.setStackFrame(localStackFrame.getStackFrameMap(), savedStackFrame);
        }


        // Make a copy of the context item
        SequenceIterator currentIterator = context.getCurrentIterator();
        if (currentIterator != null) {
            Item contextItem = currentIterator.current();
            c.savedXPathContext.setCurrentIterator(SingletonIterator.makeIterator(contextItem));
            // we don't save position() and last() because we have no way
            // of restoring them. So the caller must ensure that a Closure is not
            // created if the expression depends on position() or last()
        }

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        if (children==null || children.length == 0) {
            return EmptyIterator.getInstance();
        } else if (children.length == 1) {
            return children[0].iterate(context);
        } else {
            SequenceIterator base = new RangeExpression.RangeIterator(0, children.length-1);
            return new MappingIterator(base, this, null, context);
        }
    }

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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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