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java.lang.Object net.sf.saxon.tree.iter.SingleNodeIterator
public class SingleNodeIterator
SingletonIterator: an iterator over a sequence of zero or one values
Field Summary |
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Fields inherited from interface net.sf.saxon.om.SequenceIterator |
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GROUNDED, LAST_POSITION_FINDER, LOOKAHEAD |
Method Summary | |
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Value |
atomize()
Return the atomized value of the current node. |
void |
close()
Close the iterator. |
NodeInfo |
current()
Get the current item in the sequence. |
AxisIterator |
getAnother()
Get another iterator over the same sequence of items, positioned at the start of the sequence. |
int |
getLength()
Get the last position (that is, the number of items in the sequence). |
int |
getProperties()
Get properties of this iterator, as a bit-significant integer. |
SequenceIterator |
getReverseIterator()
Get a new SequenceIterator that returns the same items in reverse order. |
CharSequence |
getStringValue()
Return the string value of the current node. |
Item |
getValue()
|
boolean |
hasNext()
Determine whether there are more items to come. |
AxisIterator |
iterateAxis(byte axis,
NodeTest test)
Return an iterator over an axis, starting at the current node. |
static AxisIterator |
makeIterator(NodeInfo item)
Factory method. |
GroundedValue |
materialize()
Return a Value containing all the items in the sequence returned by this SequenceIterator |
boolean |
moveNext()
Move to the next node, without returning it. |
NodeInfo |
next()
Get the next item in the sequence. |
int |
position()
Return the current position in the sequence. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Method Detail |
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public static AxisIterator makeIterator(NodeInfo item)
item
- the item to iterate over
public boolean hasNext()
hasNext
in interface LookaheadIterator
public boolean moveNext()
moveNext
in interface AxisIterator
public NodeInfo next()
UnfailingIterator
next
in interface SequenceIterator
next
in interface AxisIterator
next
in interface UnfailingIterator
public NodeInfo current()
UnfailingIterator
current
in interface SequenceIterator
current
in interface AxisIterator
current
in interface UnfailingIterator
public int position()
position
in interface SequenceIterator
position
in interface UnfailingIterator
public int getLength()
LastPositionFinder
SequenceIterator.LAST_POSITION_FINDER
getLength
in interface LastPositionFinder
public 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 AxisIterator iterateAxis(byte axis, NodeTest test)
iterateAxis
in interface AxisIterator
axis
- the axis to iterate over, using a constant such as
Axis.CHILD
test
- a predicate to apply to the nodes before returning them.
public Value atomize() throws XPathException
atomize
in interface AxisIterator
NullPointerException
- if there is no current node
XPathException
- if the current node
cannot be atomized, for example because it is an element node with
element-only content.public CharSequence getStringValue()
getStringValue
in interface AxisIterator
NullPointerException
- if there is no current nodepublic AxisIterator getAnother()
UnfailingIterator
getAnother
in interface SequenceIterator
getAnother
in interface AxisIterator
getAnother
in interface UnfailingIterator
public SequenceIterator getReverseIterator()
ReversibleIterator
getReverseIterator
in interface ReversibleIterator
public Item getValue()
public GroundedValue materialize()
materialize
in interface GroundedIterator
public int getProperties()
getProperties
in interface SequenceIterator
SequenceIterator.GROUNDED
, SequenceIterator.LAST_POSITION_FINDER
,
and SequenceIterator.LOOKAHEAD
. It is always
acceptable to return the value zero, indicating that there are no known special properties.
It is acceptable for the properties of the iterator to change depending on its state.
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