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java.lang.Objectnet.sf.saxon.expr.FilterIterator
A FilterIterator filters an input sequence using a filter expression. Note that a FilterIterator is not used where the filter is a constant number (PositionFilter is used for this purpose instead), so this class does no optimizations for numeric predicates.
Nested Class Summary | |
static class |
FilterIterator.Leading
Subclass to support the extension function saxon:leading, which terminates the iteration at the first item whose predicate is false |
static class |
FilterIterator.NonNumeric
Subclass to handle the common special case where it is statically known that the filter cannot return a numeric value |
Field Summary | |
protected SequenceIterator |
base
|
protected Expression |
filter
|
protected XPathContext |
filterContext
|
Constructor Summary | |
FilterIterator(SequenceIterator base,
Expression filter,
XPathContext context)
Constructor |
Method Summary | |
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 |
protected Item |
getNextMatchingItem()
Get the next node that matches the filter predicate if there is one, or null if not. |
protected 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. |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
protected SequenceIterator base
protected Expression filter
protected XPathContext filterContext
Constructor Detail |
public FilterIterator(SequenceIterator base, Expression filter, XPathContext context) throws XPathException
base
- An iteration of the items to be filteredfilter
- The expression defining the filter predicatecontext
- The context in which the expression is being evaluatedMethod Detail |
public Item next() throws XPathException
next
in interface SequenceIterator
XPathException
- if an error occurs retrieving the next itemprotected Item getNextMatchingItem() throws XPathException
XPathException
protected boolean matches() throws XPathException
XPathException
public Item current()
SequenceIterator
current
in interface SequenceIterator
public int position()
SequenceIterator
position
in interface SequenceIterator
public SequenceIterator getAnother() throws XPathException
getAnother
in interface SequenceIterator
XPathException
- if any error occurs
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