Package net.sf.saxon.expr.sort

Class MergeInstr.MergeKeyMappingFunction

java.lang.Object

net.sf.saxon.expr.sort.MergeInstr.MergeKeyMappingFunction

All Implemented Interfaces:

ContextMappingFunction<ExternalObject<ItemWithMergeKeys>>

Enclosing class:

MergeInstr

public static class MergeInstr.MergeKeyMappingFunction
extends Object
implements ContextMappingFunction<ExternalObject<ItemWithMergeKeys>>

Mapping function for items encountered during the merge; the mapping function wraps the merged item and its merge keys into a single composite object

Constructor Summary

Constructors

Constructor	Description
MergeKeyMappingFunction(XPathContext baseContext, MergeInstr.MergeSource ms)

Method Summary

Modifier and Type	Method	Description
SequenceIterator<ExternalObject<ItemWithMergeKeys>>	map(XPathContext context)	Map one item to a sequence.

Methods inherited from class java.lang.Object

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

Constructor Details

MergeKeyMappingFunction

public MergeKeyMappingFunction(XPathContext baseContext,
 MergeInstr.MergeSource ms)

Method Details

map

public SequenceIterator<ExternalObject<ItemWithMergeKeys>> map(XPathContext context)
                                                        throws XPathException

Description copied from interface: ContextMappingFunction

Map one item to a sequence.

Specified by:

map in interface ContextMappingFunction<ExternalObject<ItemWithMergeKeys>>

Parameters:

context - The processing context. The item to be mapped is the context item identified from this context: the values of position() and last() also relate to the set of items being mapped

Returns:

a SequenceIterator over the sequence of items that the supplied input item maps to

Throws:

XPathException - if a dynamic error is detected