net.sf.saxon.expr.sort
Class SimpleCollation

java.lang.Object
  net.sf.saxon.expr.sort.SimpleCollation

All Implemented Interfaces:

Serializable, StringCollator

public class SimpleCollation
extends Object
implements StringCollator

A simple collation that just wraps a suppled Comparator

See Also:

Serialized Form

Constructor Summary

SimpleCollation(Comparator collation)
Create a SimpleCollation

Method Summary

boolean	comparesEqual(String s1, String s2) Compare two strings for equality.
int	compareStrings(String o1, String o2) Compares its two arguments for order.
Comparator	getCollation() Get the underlying comparator
Object	getCollationKey(String s) Get a collation key for two Strings.
void	setCollation(Comparator collation) 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(Comparator collation)

Create a SimpleCollation

Parameters:

collation - the Comparator that does the actual string comparison

Method Detail

compareStrings

public int compareStrings(String o1,
                          String 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:

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

comparesEqual

public boolean comparesEqual(String s1,
                             String 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,

getCollation

public Comparator getCollation()

Get the underlying comparator

Returns:

the underlying comparator

setCollation

public void setCollation(Comparator collation)

Set the underlying comparator

Parameters:

collation - the underlying comparator

getCollationKey

public Object getCollationKey(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.

Specified by:

getCollationKey in interface StringCollator

Parameters:

s - the string whose collation key is required

Returns:

the collation key