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

        tuple.add(rowCount);
      } else {
        try {
          XPathExpression path = proColumn.getPathExpression();
          XPathDynamicContext dynamicContext = path.createDynamicContext(item);
          SequenceIterator pathIter = path.iterate(dynamicContext);
          Item colItem = pathIter.next();
          if (colItem == null) {
            if (proColumn.getDefaultExpression() != null) {
              tuple.add(getEvaluator(Collections.emptyMap()).evaluate(proColumn.getDefaultExpression(), null));
            } else {
              tuple.add(null);
            }
            continue;
          }
          if (proColumn.getSymbol().getType() == DataTypeManager.DefaultDataClasses.XML) {
            XMLType value = table.getXQueryExpression().createXMLType(pathIter.getAnother(), this.getBufferManager(), false);
            tuple.add(value);
            continue;
          }
          if (pathIter.next() != null) {
            throw new TeiidProcessingException(QueryPlugin.Util.getString("XMLTableName.multi_value", proColumn.getName())); //$NON-NLS-1$
          }
          Object value = Value.convertToJava(colItem);
          if (value instanceof Item) {
            Item i = (Item)value;

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    public String evaluateAsString(Exchange exchange) throws Exception {
        initialize(exchange);


        StringWriter buffer = new StringWriter();
        SequenceIterator iter = getExpression().iterator(createDynamicContext(exchange));
        for (Item item = iter.next(); item != null; item = iter.next()) {
            buffer.append(item.getStringValueCS());
        }
        return buffer.toString();
    }

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     * @param dynamicContext
     * @return
     * @throws XPathException
     */
    public static ListVariable createListOfXmlNodes(XQueryExpression exp, DynamicQueryContext dynamicContext) throws XPathException {
        final SequenceIterator iter = exp.iterator(dynamicContext);


        ListVariable listVariable = new ListVariable();
        while (true) {
            Item item = iter.next();
            if (item == null) {
                break;
            }


            XmlNodeWrapper value = new XmlNodeWrapper(item);

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            return CodepointCollator.getInstance();
        }
    }


    private GroupIterator getGroupIterator(XPathContext context) throws XPathException {
        SequenceIterator population = select.iterate(context);


        // get an iterator over the groups in "order of first appearance"


        GroupIterator groupIterator;
        switch (algorithm) {

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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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                return item;
            } else {
                return ((AtomicValue)item).convert(BuiltInAtomicType.STRING, true, context).asAtomic();
            }
        }
        SequenceIterator iter = select.iterate(context);
        if (!isAtomic) {
            iter = Atomizer.getAtomizingIterator(iter);
        }
        FastStringBuffer sb = new FastStringBuffer(FastStringBuffer.SMALL);
        boolean first = true;
        String sep = " ";
        while (true) {
            Item item = iter.next();
            if (item==null) {
                break;
            }
            if (!first) {
                sb.append(sep);

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            Item item = select.evaluateItem(context);
            if (item != null) {
                out.characters(item.getStringValueCS(), locationId, options);
            }
        } else {
            SequenceIterator iter = select.iterate(context);
            if (!isAtomic) {
                iter = Atomizer.getAtomizingIterator(iter);
            }
            boolean first = true;
            while (true) {
                Item item = iter.next();
                if (item==null) {
                    break;
                }
                if (!first) {
                    out.characters(" ", locationId, options);

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        action.checkPermittedContents(parentType, env, false);
    }


    public TailCall processLeavingTail(XPathContext context) throws XPathException {
        Controller controller = context.getController();
        SequenceIterator iter = select.iterate(context);


        XPathContextMajor c2 = context.newContext();
        c2.setOrigin(this);
        c2.setCurrentIterator(iter);
        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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     * @return a SequenceIterator that can be used to iterate over the result
     *     of the expression
     */


    public SequenceIterator iterate(XPathContext context) throws XPathException {
        SequenceIterator master = select.iterate(context);
        XPathContextMajor c2 = context.newContext();
        c2.setOrigin(this);
        c2.setCurrentTemplateRule(null);
        c2.setCurrentIterator(master);
        master = new ContextMappingIterator(this, c2);

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            } else if (children[i] instanceof Block) {
                flushCurrentLiteralList(currentLiteralList, targetList);
                currentLiteralList = null;
                ((Block)children[i]).flatten(targetList);
            } else if (children[i] instanceof Literal &&!(((Literal)children[i]).getValue() instanceof IntegerRange)) {
                SequenceIterator iterator = ((Literal)children[i]).getValue().iterate();
                if (currentLiteralList == null) {
                    currentLiteralList = new ArrayList<Item>(10);
                }
                while (true) {
                    Item item = iterator.next();
                    if (item == null) {
                        break;
                    }
                    currentLiteralList.add(item);
                }

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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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