net.sf.saxon.expr.sort
Class CaseFirstCollator

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

All Implemented Interfaces:

Serializable, StringCollator

public class CaseFirstCollator
extends Object
implements StringCollator, Serializable

A StringCollator that sorts lowercase before uppercase, or vice versa.

Case is irrelevant, unless the strings are equal ignoring case, in which case lowercase comes first.

Author:

Michael H. Kay

See Also:

Serialized Form

Constructor Summary

CaseFirstCollator(StringCollator base, boolean upperFirst)
Create a CaseFirstCollator

Method Summary

boolean	comparesEqual(String s1, String s2) Compare two strings for equality.
int	compareStrings(String a, String b) Compare two string objects: case is irrelevant, unless the strings are equal ignoring case, in which case lowercase comes first.
Object	getCollationKey(String s) Get a collation key for two Strings.

Methods inherited from class java.lang.Object

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

Constructor Detail

CaseFirstCollator

public CaseFirstCollator(StringCollator base,
                         boolean upperFirst)

Create a CaseFirstCollator

Parameters:

base - the base collator, which determines how characters are sorted irrespective of case

upperFirst - true if uppercase precedes lowercase, false otherwise

Method Detail

compareStrings

public int compareStrings(String a,
                          String b)

Compare two string objects: case is irrelevant, unless the strings are equal ignoring case, in which case lowercase comes first.

Specified by:

compareStrings in interface StringCollator

Parameters:

a - the first string

b - the second string

Returns:

<0 if a0 if a>b

Throws:

ClassCastException - if the objects are of the wrong type for this Comparer

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,

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