public final class CardinalityCheckingIterator extends java.lang.Object implements SequenceIterator
|Constructor and Description|
Construct an CardinalityCheckingIterator that will return the same items as the base sequence, checking how many there are
|Modifier and Type||Method and Description|
Close the iterator.
Get the next item in the sequence.
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
public CardinalityCheckingIterator(SequenceIterator base, int requiredCardinality, RoleDiagnostic role, Location locator) throws XPathException
base- the base iterator
requiredCardinality- the required Cardinality
role- information for use if a failure occurs
locator- the location in the source stylesheet or query
XPathException- if a failure is detected
public Item next() throws XPathException
XPathException- if an error occurs retrieving the next item
public void close()
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.
Copyright (c) 2004-2021 Saxonica Limited. All rights reserved.