net.sf.saxon.sort
Class FixedSortKeyDefinition

java.lang.Object
  |
  +--net.sf.saxon.sort.SortKeyDefinition
        |
        +--net.sf.saxon.sort.FixedSortKeyDefinition

All Implemented Interfaces:

java.io.Serializable

public class FixedSortKeyDefinition

extends SortKeyDefinition

A FixedSortKeyDefinition is a SortKeyDefinition in which all aspects of the sort key definition (sort order, data type, etc,) are known. A SortKeyDefinition defines one component of a sort key.

See Also:

Serialized Form

Field Summary

 

Fields inherited from class net.sf.saxon.sort.SortKeyDefinition

caseOrder, collation, dataTypeExpression, emptyFirst, language, order, sortKey

 

Constructor Summary

FixedSortKeyDefinition()

 

Method Summary
void	bindComparer()           Allocate a resusable Comparer to implement this sort key comparison
java.util.Comparator	getComparer(XPathContext context)           Get the comparer which is used to compare two values according to this sort key.
FixedSortKeyDefinition	reduce(XPathContext context)           Eliminate dependencies of the sort key definition on the context.
SortKeyDefinition	simplify()

 

Methods inherited from class net.sf.saxon.sort.SortKeyDefinition

getEmptyFirst, getSortKey, setCaseOrder, setCollation, setDataTypeExpression, setEmptyFirst, setLanguage, setOrder, setSortKey

 

Methods inherited from class java.lang.Object

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

 

Constructor Detail

FixedSortKeyDefinition

public FixedSortKeyDefinition()

simplify

public SortKeyDefinition simplify()
                           throws XPathException

Overrides:

simplify in class SortKeyDefinition

XPathException

reduce

public FixedSortKeyDefinition reduce(XPathContext context)
                              throws XPathException

Eliminate dependencies of the sort key definition on the context. For the sort key select expression, this means things that don't depend on the individual node: specifically, variables and current-group(). For the AVTs used to select data type, case order, language, it means all dependencies: after reduction, these values will be constants.

Overrides:

reduce in class SortKeyDefinition

XPathException

bindComparer

public void bindComparer()
                  throws XPathException

Allocate a resusable Comparer to implement this sort key comparison

XPathException

getComparer

public java.util.Comparator getComparer(XPathContext context)
                                 throws XPathException

Get the comparer which is used to compare two values according to this sort key.

XPathException