FilterIterator.NonNumeric

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

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable, 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
- Nested classes/interfaces inherited from interface net.sf.saxon.om.SequenceIterator
  SequenceIterator.Property

Field Summary
- Fields inherited from class net.sf.saxon.expr.FilterIterator
  base, filter, filterContext

Constructor Summary

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

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type Method Description

protected boolean matches()
Determine whether the context item matches the filter predicate
- Methods inherited from class net.sf.saxon.expr.FilterIterator
  close, getNextMatchingItem, next, setSequence, testPredicateValue
- Methods inherited from class java.lang.Object
  clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
- Methods inherited from interface net.sf.saxon.om.SequenceIterator
  forEachOrFail, getProperties, materialize

- Constructor Detail
  - NonNumeric
```
public NonNumeric(SequenceIterator base,
                  Expression filter,
                  XPathContext context)
```
    Create a CompiledFilterIterator 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 - if an error occurs evaluating the match