Package net.sf.saxon.expr.sort

Class SimpleCollation

java.lang.Object

net.sf.saxon.expr.sort.SimpleCollation

All Implemented Interfaces:

StringCollator

Direct Known Subclasses:

RuleBasedSubstringMatcher

public class SimpleCollation
extends java.lang.Object
implements StringCollator

A simple collation that just wraps a supplied Comparator

Constructor Summary

Constructors

Constructor	Description
SimpleCollation(java.lang.String uri, java.util.Comparator<? super java.lang.String> comparator)	Create a SimpleCollation

Method Summary

Modifier and Type	Method	Description
boolean	comparesEqual(UnicodeString s1, UnicodeString s2)	Compare two strings for equality.
int	compareStrings(UnicodeString o1, UnicodeString o2)	Compares its two arguments for order.
AtomicMatchKey	getCollationKey(UnicodeString s)	Get a collation key for a String.
java.lang.String	getCollationURI()	Get the collation URI.
java.util.Comparator<? super java.lang.String>	getComparator()	Get the underlying comparator
SubstringMatcher	getSubstringMatcher()	If possible, get a collator capable of substring matching (in functions such as fn:contains()).
void	setComparator(java.util.Comparator<? super java.lang.String> comparator)	Set the underlying comparator

Methods inherited from class java.lang.Object

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

Constructor Detail

SimpleCollation

public SimpleCollation(java.lang.String uri,
                       java.util.Comparator<? super java.lang.String> comparator)

Create a SimpleCollation

Parameters:

uri - the collation URI

comparator - the Comparator that does the actual string comparison

Method Detail

getCollationURI

public java.lang.String getCollationURI()

Get the collation URI. It must be possible to use this collation URI to reconstitute the collation

Specified by:

getCollationURI in interface StringCollator

Returns:

a collation URI that can be used to reconstruct the collation when an XSLT package is reloaded.

compareStrings

public int compareStrings(UnicodeString o1,
                          UnicodeString o2)

Compares its two arguments for order. Returns a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the second.

Specified by:

compareStrings in interface StringCollator

Parameters:

o1 - the first object to be compared.

o2 - the second object to be compared.

Returns:

a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the second.

Throws:

java.lang.ClassCastException - if the arguments' types prevent them from being compared by this Comparator.

comparesEqual

public boolean comparesEqual(UnicodeString s1,
                             UnicodeString s2)

Compare two strings for equality. This may be more efficient than using compareStrings and testing whether the result is zero, but it must give the same result

Specified by:

comparesEqual in interface StringCollator

Parameters:

s1 - the first string

s2 - the second string

Returns:

true if and only if the strings are considered equal,

getComparator

public java.util.Comparator<? super java.lang.String> getComparator()

Get the underlying comparator

Returns:

the underlying comparator

setComparator

public void setComparator(java.util.Comparator<? super java.lang.String> comparator)

Set the underlying comparator

Parameters:

comparator - the underlying comparator

getCollationKey

public AtomicMatchKey getCollationKey(UnicodeString s)

Get a collation key for a String. 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.

Specified by:

getCollationKey in interface StringCollator

Parameters:

s - the string whose collation key is required

Returns:

the collation key

getSubstringMatcher

public SubstringMatcher getSubstringMatcher()

If possible, get a collator capable of substring matching (in functions such as fn:contains()).

Returns:

a collator suitable for substring matching, or null if none is available