net.sf.saxon.expr
Class FilterIterator.NonNumeric

java.lang.Object
  net.sf.saxon.expr.FilterIterator
      net.sf.saxon.expr.FilterIterator.NonNumeric

All Implemented Interfaces:

SequenceIterator

Enclosing class:

FilterIterator

public static final class FilterIterator.NonNumeric
extends FilterIterator

Subclass to handle the common special case where it is statically known that the filter cannot return a numeric value

Nested Class Summary

Nested classes/interfaces inherited from class net.sf.saxon.expr.FilterIterator

FilterIterator.NonNumeric

Field Summary

Fields inherited from class net.sf.saxon.expr.FilterIterator

base, filter, filterContext

Fields inherited from interface net.sf.saxon.om.SequenceIterator

GROUNDED, LAST_POSITION_FINDER, LOOKAHEAD

Constructor Summary

FilterIterator.NonNumeric(SequenceIterator base, Expression filter, XPathContext context)
Create a FilterIterator for the situation where it is known that the filter expression will never evaluate to a number value.

Method Summary

SequenceIterator	getAnother() Get another iterator to return the same nodes
protected boolean	matches() Determine whether the context item matches the filter predicate

Methods inherited from class net.sf.saxon.expr.FilterIterator

close, current, getNextMatchingItem, getProperties, next, position

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

FilterIterator.NonNumeric

public FilterIterator.NonNumeric(SequenceIterator base,
                                 Expression filter,
                                 XPathContext context)

Create a FilterIterator for the situation where it is known that the filter expression will never evaluate to a number value. For this case we can simply use the effective boolean value of the predicate

Parameters:

base - iterator over the sequence to be filtered

filter - the filter expression

context - the current context (for evaluating the filter expression as a whole). A new context will be created to evaluate the predicate.

Method Detail

matches

protected boolean matches()
                   throws XPathException

Determine whether the context item matches the filter predicate

Overrides:

matches in class FilterIterator

Returns:

true if the context item matches

Throws:

XPathException

getAnother

public SequenceIterator getAnother()
                            throws XPathException

Get another iterator to return the same nodes

Specified by:

getAnother in interface SequenceIterator

Overrides:

getAnother in class FilterIterator

Returns:

a SequenceIterator that iterates over the same items, positioned before the first item

Throws:

XPathException - if any error occurs