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java.lang.Objectnet.sf.saxon.tree.iter.IteratorIterator<T>
public abstract class IteratorIterator<T extends Item>
A SequenceIterator that wraps a Java Iterator. This is an abstract class, because the Java iterator does not hold enough information to support the getAnother() method, needed to implement the XPath last() function
| Field Summary |
|---|
| Fields inherited from interface net.sf.saxon.om.SequenceIterator |
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GROUNDED, LAST_POSITION_FINDER, LOOKAHEAD |
| Constructor Summary | |
|---|---|
IteratorIterator(Iterator<T> base)
Create a SequenceIterator over a given iterator |
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| Method Summary | |
|---|---|
void |
close()
Close the iterator. |
T |
current()
Get the current value in the sequence (the one returned by the most recent call on next()). |
abstract UnfailingIterator<T> |
getAnother()
Get another SequenceIterator that iterates over the same items as the original, but which is repositioned at the start of the sequence. |
int |
getProperties()
Get properties of this iterator, as a bit-significant integer. |
boolean |
hasNext()
Determine whether there are more items to come. |
T |
next()
Get the next item in the sequence. |
int |
position()
Get the current position. |
| Methods inherited from class java.lang.Object |
|---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
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public IteratorIterator(Iterator<T> base)
base - the base Iterator| Method Detail |
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public boolean hasNext()
LookaheadIteratorSequenceIterator.LOOKAHEAD
hasNext in interface LookaheadIterator<T extends Item>public T next()
SequenceIterator
next in interface SequenceIterator<T extends Item>next in interface UnfailingIterator<T extends Item>public T current()
SequenceIterator
current in interface SequenceIterator<T extends Item>current in interface UnfailingIterator<T extends Item>public int position()
SequenceIteratorThis method does not change the state of the iterator.
position in interface SequenceIterator<T extends Item>position in interface UnfailingIterator<T extends Item>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<T extends Item>public abstract UnfailingIterator<T> getAnother()
SequenceIteratorThis method allows access to all the items in the sequence without disturbing the current position of the iterator. Internally, its main use is in evaluating the last() function.
This method does not change the state of the iterator.
getAnother in interface SequenceIterator<T extends Item>getAnother in interface UnfailingIterator<T extends Item>public int getProperties()
getProperties in interface SequenceIterator<T extends Item>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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