ForExpression.MappingAction (saxon JavaDoc)

java.lang.Object
- net.sf.saxon.expr.ForExpression.MappingAction

All Implemented Interfaces:

ItemMappingFunction<Item<?>,Item<?>>, MappingFunction<Item<?>,Item<?>>

Enclosing class:

ForExpression
```
public static class ForExpression.MappingAction
extends Object
implements MappingFunction<Item<?>,Item<?>>, ItemMappingFunction<Item<?>,Item<?>>
```
The MappingAction represents the action to be taken for each item in the source sequence. It acts as the MappingFunction for the mapping iterator.

Field Summary

Fields
Modifier and Type Field Description

protected XPathContext context

Constructor Summary

Constructors
Constructor Description

MappingAction(XPathContext context, int slotNumber, Expression action)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`SequenceIterator<?>`	`map(Item<?> item)`	Map one item to a sequence.
`Item<?>`	`mapItem(Item<?> item)`	Map one item to another item.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - context
```
protected XPathContext context
```
- Constructor Detail
  - MappingAction
```
public MappingAction(XPathContext context,
                     int slotNumber,
                     Expression action)
```
- Method Detail
  - map
```
public SequenceIterator<?> map(Item<?> item)
                        throws XPathException
```
    Description copied from interface: MappingFunction
    
    Map one item to a sequence.
    
    Specified by:
    
    map in interface MappingFunction<Item<?>,Item<?>>
    
    Parameters:
    
    item - The item to be mapped.
    
    Returns:
    
    one of the following: (a) a SequenceIterator over the sequence of items that the supplied input item maps to, or (b) null if it maps to an empty sequence.
    
    Throws:
    
    XPathException - if a dynamic error occurs
  - mapItem
```
public Item<?> mapItem(Item<?> item)
                throws XPathException
```
    Description copied from interface: ItemMappingFunction
    
    Map one item to another item.
    
    Specified by:
    
    mapItem in interface ItemMappingFunction<Item<?>,Item<?>>
    
    Parameters:
    
    item - The input item to be mapped.
    
    Returns:
    
    either the output item, or null.
    
    Throws:
    
    XPathException - if a dynamic error occurs