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

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


    public SequenceIterator iterate(XPathContext context) throws XPathException {
        AtomicComparer comp = makeAtomicComparer(context);
        SequenceIterator iter = argument[0].iterate(context);
        return new DistinctIterator(iter, comp);
    }

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    /**
    * Evaluate the function in a boolean context
    */


    public boolean effectiveBooleanValue(XPathContext c) throws XPathException {
        SequenceIterator iter = argument[0].iterate(c);
        return iter.next() != null;
    }

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    /**
    * Evaluate the function in a boolean context
    */


    public boolean effectiveBooleanValue(XPathContext c) throws XPathException {
        SequenceIterator iter = argument[0].iterate(c);
        return iter.next() == null;
    }

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


    public SequenceIterator iterate(XPathContext context) throws XPathException {
        GenericAtomicComparer comparer = getAtomicComparer(2, context);
        SequenceIterator seq = argument[0].iterate(context);
        AtomicValue val = (AtomicValue)argument[1].evaluateItem(context);
        return new IndexIterator(seq, val, comparer);
    }

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            return baseProps;
        }
    }


    public SequenceIterator iterate(XPathContext context) throws XPathException {
        SequenceIterator forwards = argument[0].iterate(context);
        return getReverseIterator(forwards);
    }

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            dynamicError("In the " + getFunctionName().getLocalName() + "() function," +
                            " the tree being searched must be one whose root is a document node", "FODC0001", context);
            return null;
        }
        DocumentInfo doc = (DocumentInfo)arg1;
        SequenceIterator idrefs = argument[0].iterate(context);
        IdMappingFunction map = new IdMappingFunction();
        map.document = doc;
        SequenceIterator result = new MappingIterator(idrefs, map);
        return new DocumentOrderIterator(result, LocalOrderComparer.getInstance());
    }

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


    public SequenceIterator iterate(XPathContext context) throws XPathException {
        SequenceIterator seq = argument[0].iterate(context);
        AtomicValue n0 = (AtomicValue)argument[1].evaluateItem(context);
        NumericValue n = (NumericValue)n0;
        int pos = (int)n.intValue();
        SequenceIterator ins = argument[2].iterate(context);
        return new InsertIterator(seq, ins, pos);
    }

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    * @param c The context for evaluation
    * @return a SequenceIterator representing the union of the two operands
    */


    public SequenceIterator iterate(final XPathContext c) throws XPathException {
        SequenceIterator i1 = operand0.iterate(c);
        //return Type.isNodeType(getItemType()) && isSingleton();
        // this is a sufficient condition, but other expressions override this method
        if ((operand0.getSpecialProperties() & StaticProperty.ORDERED_NODESET) == 0) {
            i1 = new DocumentOrderIterator(i1, GlobalOrderComparer.getInstance());
        }
        SequenceIterator i2 = operand1.iterate(c);
        //return Type.isNodeType(getItemType()) && isSingleton();
        // this is a sufficient condition, but other expressions override this method
        if ((operand1.getSpecialProperties() & StaticProperty.ORDERED_NODESET) == 0) {
            i2 = new DocumentOrderIterator(i2, GlobalOrderComparer.getInstance());
        }

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                context.getReceiver().append(item, NodeInfo.ALL_NAMESPACES);
            }


        } else if ((m & ITERATE_METHOD) != 0) {


            SequenceIterator iter = iterate(context);
            SequenceReceiver out = context.getReceiver();
            try {
                while (true) {
                    Item it = iter.next();
                    if (it == null) {
                        break;
                    }
                    out.append(it, NodeInfo.ALL_NAMESPACES);
                }

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     * Return the value in the form of an Item
     * @return the value in the form of an Item
     */


    public Item asItem() throws XPathException {
        SequenceIterator iter = iterate();
        Item item = iter.next();
        if (item == null) {
            return null;
        } else if (iter.next() != null) {
            throw new XPathException("Attempting to access a sequence as a singleton item");
        } else {
            return item;
        }
    }

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