net.sf.saxon.tree.iter

Class ConcatenatingAxisIterator

java.lang.Object

net.sf.saxon.tree.iter.ConcatenatingAxisIterator

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable, SequenceIterator, AxisIterator

public class ConcatenatingAxisIterator
extends java.lang.Object
implements AxisIterator

An iterator over nodes, that concatenates the nodes returned by two supplied iterators.

Constructor Summary

Constructors

Constructor and Description
ConcatenatingAxisIterator(AxisIterator first, AxisIterator second)

Method Summary

Modifier and Type	Method and Description
void	close() Close the iterator.
NodeInfo	next() Get the next item in the sequence.

Methods inherited from class java.lang.Object

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

Methods inherited from interface net.sf.saxon.om.SequenceIterator

discharge

Constructor Detail

ConcatenatingAxisIterator

public ConcatenatingAxisIterator(AxisIterator first,
                                 AxisIterator second)

Method Detail

next

public NodeInfo next()

Get the next item in the sequence.

Specified by:

next in interface SequenceIterator

Specified by:

next in interface AxisIterator

Returns:

the next Item. If there are no more nodes, return null.

close

public void close()

Description copied from interface: SequenceIterator

Close the iterator. This indicates to the supplier of the data that the client does not require any more items to be delivered by the iterator. This may enable the supplier to release resources. After calling close(), no further calls on the iterator should be made; if further calls are made, the effect of such calls is undefined.

For example, the iterator returned by the unparsed-text-lines() function has a close() method that causes the underlying input stream to be closed, whether or not the file has been read to completion.

Closing an iterator is important when the data is being "pushed" in another thread. Closing the iterator terminates that thread and means that it needs to do no additional work. Indeed, failing to close the iterator may cause the push thread to hang waiting for the buffer to be emptied.

Closing an iterator is not necessary if the iterator is read to completion: if a call on SequenceIterator.next() returns null, the iterator will be closed automatically. An explicit call on SequenceIterator.close() is needed only when iteration is abandoned prematurely.

Specified by:

close in interface java.io.Closeable

Specified by:

close in interface java.lang.AutoCloseable

Specified by:

close in interface SequenceIterator