net.sf.saxon.expr.sort
Class NamedCollation

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

All Implemented Interfaces:

Serializable, StringCollator

public class NamedCollation
extends Object
implements StringCollator

A StringCollator is used for comparing strings (Java String objects). The URI is retained along with the collation so that the collation can be reconstructed on demand, typically at run-time by compiled code which has access to the URI but not the collation object itself.

See Also:

Serialized Form

Constructor Summary

NamedCollation(String uri, Comparator collation)
Create a NamedCollation

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.
String	getUri() Get the URI identifying the collation
void	setCollation(Comparator collation) Set the underlying comparator
void	setUri(String uri) Set the URI identifying the collation

Methods inherited from class java.lang.Object

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

Constructor Detail

NamedCollation

public NamedCollation(String uri,
                      Comparator collation)

Create a NamedCollation

Parameters:

uri - the name of the collation

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,

getUri

public String getUri()

Get the URI identifying the collation

setUri

public void setUri(String uri)

Set the URI identifying the collation

Parameters:

uri - the collation URI

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