public final class MemoSequence.ProgressiveIterator extends java.lang.Object implements SequenceIterator, LastPositionFinder, GroundedIterator
ATOMIZING, GROUNDED, LAST_POSITION_FINDER, LOOKAHEAD
Constructor and Description |
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ProgressiveIterator()
Create a ProgressiveIterator
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Modifier and Type | Method and Description |
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void |
close()
Close the iterator.
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int |
getLength()
Get the last position (that is, the number of items in the sequence)
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MemoSequence |
getMemoSequence()
Get the containing MemoSequence
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int |
getProperties()
Get properties of this iterator, as a bit-significant integer.
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GroundedValue |
getResidue()
Return a GroundedValue containing all the remaining items in the sequence returned by this
SequenceIterator, starting at the current position.
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GroundedValue |
materialize()
Return a value containing all the items in the sequence returned by this
SequenceIterator
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Item |
next()
Get the next item in the sequence.
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public MemoSequence getMemoSequence()
public Item next() throws XPathException
SequenceIterator
next
in interface SequenceIterator
XPathException
- if an error occurs retrieving the next itempublic void close()
SequenceIterator
(Currently, closing an iterator is important only 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.)
close
in interface SequenceIterator
public int getLength() throws XPathException
getLength
in interface LastPositionFinder
XPathException
- if an error occurs evaluating the sequence in order to determine
the number of itemspublic GroundedValue materialize() throws XPathException
materialize
in interface GroundedIterator
XPathException
- in the cases of subclasses (such as the iterator over a MemoClosure)
which cause evaluation of expressions while materializing the value.public GroundedValue getResidue() throws XPathException
GroundedIterator
getResidue
in interface GroundedIterator
XPathException
- in the cases of subclasses (such as the iterator over a MemoClosure)
which cause evaluation of expressions while materializing the value.public int getProperties()
getProperties
in interface SequenceIterator
SequenceIterator.GROUNDED
and SequenceIterator.LAST_POSITION_FINDER
. It is always
acceptable to return the value zero, indicating that there are no known special properties.Copyright (c) 2004-2018 Saxonica Limited. All rights reserved.