net.sf.saxon.s9api

Class XdmSequenceIterator

java.lang.Object

net.sf.saxon.s9api.XdmSequenceIterator

All Implemented Interfaces:

Iterator<XdmItem>

public class XdmSequenceIterator
extends Object
implements Iterator<XdmItem>

An iterator over an XPath sequence.

This class implements the standard Java Iterator interface.

Because the Iterator interface does not define any checked exceptions, the hasNext() method of this iterator throws an unchecked exception if a dynamic error occurs while evaluating the expression. Applications wishing to control error handling should take care to catch this exception.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	XdmSequenceIterator(SequenceIterator base)

Method Summary

Methods

Modifier and Type	Method and Description
void	close() The close() method should be called to release resources if the caller wants to stop reading data before reaching the end.
boolean	hasNext() Returns true if the iteration has more elements.
XdmItem	next() Returns the next element in the iteration.
void	remove() Not supported on this implementation.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

XdmSequenceIterator

protected XdmSequenceIterator(SequenceIterator base)

Method Detail

hasNext

public boolean hasNext()
                throws SaxonApiUncheckedException

Returns true if the iteration has more elements. (In other words, returns true if next would return an element rather than throwing an exception.)

Specified by:

hasNext in interface Iterator<XdmItem>

Returns:

true if the iterator has more elements.

Throws:

SaxonApiUncheckedException - if a dynamic error occurs during XPath evaluation that is detected at this point.

next

public XdmItem next()

Returns the next element in the iteration. Calling this method repeatedly until the hasNext() method returns false will return each element in the underlying collection exactly once.

Specified by:

next in interface Iterator<XdmItem>

Returns:

the next element in the iteration.

Throws:

NoSuchElementException - iteration has no more elements.

remove

public void remove()

Not supported on this implementation.

Specified by:

remove in interface Iterator<XdmItem>

Throws:

UnsupportedOperationException - always

close

public void close()

The close() method should be called to release resources if the caller wants to stop reading data before reaching the end. This is particularly relevant if the query uses saxon:stream() to read its input, since there will then be another thread supplying data, which will be left in suspended animation if no-one is consuming the data.

Since:

9.5.1.5 (see bug 2016)