net.sf.saxon.expr.sort
Class CodepointCollator

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

All Implemented Interfaces:

Serializable, SubstringMatcher, StringCollator

public class CodepointCollator
extends Object
implements StringCollator, SubstringMatcher, Serializable

A collating sequence that uses Unicode codepoint ordering

See Also:

Serialized Form

Constructor Summary

CodepointCollator()

Method Summary

int	compareCS(CharSequence a, CharSequence b) Compare two CharSequence objects.
boolean	comparesEqual(String s1, String s2) Test whether one string is equal to another, according to the rules of the XPath compare() function.
int	compareStrings(String a, String b) Compare two string objects.
boolean	contains(String s1, String s2) Test whether one string contains another, according to the rules of the XPath contains() function
boolean	endsWith(String s1, String s2) Test whether one string ends with another, according to the rules of the XPath ends-with() function
Object	getCollationKey(String s) Get a collation key for two Strings.
static CodepointCollator	getInstance()
boolean	startsWith(String s1, String s2) Test whether one string starts with another, according to the rules of the XPath starts-with() function
String	substringAfter(String s1, String s2) Return the part of a string after a given substring, according to the rules of the XPath substring-after() function
String	substringBefore(String s1, String s2) Return the part of a string before a given substring, according to the rules of the XPath substring-before() function

Methods inherited from class java.lang.Object

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

Constructor Detail

CodepointCollator

public CodepointCollator()

Method Detail

getInstance

public static CodepointCollator getInstance()

compareStrings

public int compareStrings(String a,
                          String b)

Compare two string objects.

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

compareCS

public int compareCS(CharSequence a,
                     CharSequence b)

Compare two CharSequence objects. This is hand-coded to avoid converting the objects into Strings.

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)

Test whether one string is equal to another, according to the rules of the XPath compare() function. The result is true if and only if the compare() method returns zero: but the implementation may be more efficient than calling compare and testing the result for zero

Specified by:

comparesEqual in interface StringCollator

Parameters:

s1 - the first string

s2 - the second string

Returns:

true iff s1 equals s2

contains

public boolean contains(String s1,
                        String s2)

Test whether one string contains another, according to the rules of the XPath contains() function

Specified by:

contains in interface SubstringMatcher

Parameters:

s1 - the containing string

s2 - the contained string

Returns:

true iff s1 contains s2

endsWith

public boolean endsWith(String s1,
                        String s2)

Test whether one string ends with another, according to the rules of the XPath ends-with() function

Specified by:

endsWith in interface SubstringMatcher

Parameters:

s1 - the containing string

s2 - the contained string

Returns:

true iff s1 ends with s2

startsWith

public boolean startsWith(String s1,
                          String s2)

Test whether one string starts with another, according to the rules of the XPath starts-with() function

Specified by:

startsWith in interface SubstringMatcher

Parameters:

s1 - the containing string

s2 - the contained string

Returns:

true iff s1 starts with s2

substringAfter

public String substringAfter(String s1,
                             String s2)

Return the part of a string after a given substring, according to the rules of the XPath substring-after() function

Specified by:

substringAfter in interface SubstringMatcher

Parameters:

s1 - the containing string

s2 - the contained string

Returns:

the part of s1 that follows the first occurrence of s2

substringBefore

public String substringBefore(String s1,
                              String s2)

Return the part of a string before a given substring, according to the rules of the XPath substring-before() function

Specified by:

substringBefore in interface SubstringMatcher

Parameters:

s1 - the containing string

s2 - the contained string

Returns:

the part of s1 that precedes the first occurrence of s2

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