net.sf.saxon.expr.sort
Class CodepointCollator

java.lang.Object
  extended by net.sf.saxon.expr.sort.CodepointCollator
All Implemented Interfaces:
Serializable, StringCollator, SubstringMatcher

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


Copyright (c) 2004-2011 Saxonica Limited. All rights reserved.