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java.lang.Object com.saxonica.bytecode.iter.CompiledFilterIterator
public abstract class CompiledFilterIterator
A CompiledFilterIterator filters an input sequence using a filter expression.
Field Summary | |
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protected SequenceIterator |
base
|
protected XPathContext |
filterContext
|
Fields inherited from interface net.sf.saxon.om.SequenceIterator |
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GROUNDED, LAST_POSITION_FINDER, LOOKAHEAD |
Constructor Summary | |
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CompiledFilterIterator()
Zero-argument constructor (used by generated bytecode) |
Method Summary | |
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void |
close()
Close the iterator. |
Item |
current()
Get the current value in the sequence (the one returned by the most recent call on next()). |
SequenceIterator |
getAnother()
Get another iterator to return the same nodes |
int |
getProperties()
Get properties of this iterator, as a bit-significant integer. |
protected abstract boolean |
matches()
Determine whether the context item matches the filter predicate |
Item |
next()
Get the next item if there is one |
int |
position()
Get the current position. |
void |
setSequence(SequenceIterator base,
XPathContext context)
Set the base iterator and context |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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protected SequenceIterator base
protected XPathContext filterContext
Constructor Detail |
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public CompiledFilterIterator()
Method Detail |
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public final void setSequence(SequenceIterator base, XPathContext context)
base
- the iterator over the sequence to be filteredcontext
- the context in which the (outer) filter expression is evaluatedpublic final Item next() throws XPathException
next
in interface SequenceIterator
XPathException
- if an error occurs retrieving the next itemprotected abstract boolean matches() throws XPathException
XPathException
public Item current()
SequenceIterator
current
in interface SequenceIterator
public int position()
SequenceIterator
This method does not change the state of the iterator.
position
in interface SequenceIterator
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 SequenceIterator getAnother() throws XPathException
getAnother
in interface SequenceIterator
XPathException
- if any error occurspublic 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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