Examples of net.sf.saxon.om.Item

net.sf.saxon.om.Item
An Item is an object that can occur as a member of a sequence. It corresponds directly to the concept of an item in the XPath 2.0 data model. There are two kinds of Item: atomic values, and nodes.
This interface is part of the public Saxon API. As such (starting from Saxon 8.4), methods that form part of the stable API are labelled with a JavaDoc "since" tag to identify the Saxon release at which they were introduced.
Note: there is no method getItemType(). This is to avoid having to implement it on every implementation of NodeInfo. Instead, use the static method Type.getItemType(Item). @author Michael H. Kay @since 8.4

            pipe.setHostLanguage(getHostLanguage());
            seq.setPipelineConfiguration(pipe);
            c2.setTemporaryReceiver(seq);
            process(c2);
            seq.close();
            Item result = seq.getFirstItem();
            seq.reset();
            return result;
        }
    }

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     */


    public SequenceIterator iterate(XPathContext context) throws XPathException {
        int m = getImplementationMethod();
        if ((m & EVALUATE_METHOD) != 0) {
            Item item = evaluateItem(context);
            if (item==null) {
                return EmptyIterator.getInstance();
            } else {
                return SingletonIterator.makeIterator(item);
            }

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     *     The expression must return a string or (); if the value of the
     *     expression is (), this method returns "".
     */


    public final CharSequence evaluateAsString(XPathContext context) throws XPathException {
        Item item = evaluateItem(context);
        if (item==null) {
            return "";
        } else {
            return item.getStringValue();
        }
    }

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    * as a string. The expansion must not generate any element or attribute nodes.
    * @param context The dynamic context for the transformation
    */


    public CharSequence expandChildren(XPathContext context) throws XPathException {
        Item item = select.evaluateItem(context);
        if (item==null) {
            return (noNodeIfEmpty ? null : "");
        } else {
            return item.getStringValueCS();
        }
    }

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    public Item evaluateItem(XPathContext context) throws XPathException {


        if (isSingleton && isAtomic) {
            // optimize for this case
            Item item = select.evaluateItem(context);
            if (item == null) {
                if (noNodeIfEmpty) {
                    return null;
                } else {
                    return StringValue.EMPTY_STRING;
                }
            }
            if (item instanceof StringValue) {
                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);
            }
            first = false;
            sb.append(item.getStringValueCS());
        }
        if (first && noNodeIfEmpty) {
            return null;
        }
        return StringValue.makeStringValue(sb.condense());

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     */


    public void process(XPathContext context, int locationId, int options) throws XPathException {
        SequenceReceiver out = context.getReceiver();
        if (isSingleton && isAtomic) {
            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);
                }
                first = false;
                out.characters(item.getStringValueCS(), locationId, options);
            }
        }
    }

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        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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                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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        @Override
        public ExtensionFunctionCall makeCallExpression() {
            return new ExtensionFunctionCall() {
                @Override
                public SequenceIterator<? extends Item> call(SequenceIterator<? extends Item>[] sequenceIterators, XPathContext xPathContext) throws XPathException {
                    Item arg1 = sequenceIterators[0].next();
                    String arg1Val = arg1.getStringValue();


                    // return a altered version of the first arg
                    StringValue sv = new StringValue("arg1[" + arg1Val + "]");
                    return SingletonIterator.makeIterator(sv);
                }

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    protected DynamicQueryContext createDynamicContext(Exchange exchange) throws Exception {
        Configuration config = getConfiguration();
        DynamicQueryContext dynamicQueryContext = new DynamicQueryContext(config);


        Message in = exchange.getIn();
        Item item = null;
        if (ObjectHelper.isNotEmpty(getHeaderName())) {
            item = in.getHeader(getHeaderName(), Item.class);
        } else {
            item = in.getBody(Item.class);
        }

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net.sf.saxon.expr.ComputedExpression

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