net.sf.saxon.sort

Interface StringCollator

All Superinterfaces:

java.io.Serializable

All Known Subinterfaces:

SubstringMatcher

All Known Implementing Classes:

AlphanumericCollator, CodepointCollator, LowercaseFirstCollator, NamedCollation, RuleBasedSubstringMatcher, UppercaseFirstCollator

public interface StringCollator
extends java.io.Serializable

This interface represents a "collation" as defined in XPath, that is, a set of rules for comparing strings

Method Summary

Methods

Modifier and Type	Method and Description
int	compareStrings(java.lang.String o1, java.lang.String o2) Compare two strings
java.lang.Object	getCollationKey(java.lang.String s) Get a collation key for two Strings.

Method Detail

compareStrings

int compareStrings(java.lang.String o1,
                 java.lang.String o2)

Compare two strings

Parameters:

o1 - the first string

o2 - the second string

Returns:

0 if the strings are considered equal, a negative integer if the first string is less than the second, a positive integer if the first string is greater than the second

getCollationKey

java.lang.Object getCollationKey(java.lang.String s)

Get a collation key for two Strings. The essential property of collation keys is that if two values are equal under the collation, then the collation keys are compare correctly under the equals() method.

Parameters:

s - the string whose collation key is required

Returns:

the collation key