net.sf.saxon.expr.sort
Class RuleBasedSubstringMatcher

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

All Implemented Interfaces:

Serializable, StringCollator, SubstringMatcher

public class RuleBasedSubstringMatcher
extends Object
implements SubstringMatcher

This class wraps a RuleBasedCollator to provide a SubstringMatcher. This users the facilities offered by the RuleBasedCollator to implement the XPath functions contains(), starts-with(), ends-with(), substring-before(), and substring-after().

See Also:

Serialized Form

Constructor Summary

RuleBasedSubstringMatcher(RuleBasedCollator collator)
Create a RuleBasedSubstringMatcher

Method Summary

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 o1, String o2) Compare two strings
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.
RuleBasedCollator	getUnderlyingCollator() Get the underlying RuleBasedCollator
static void	main(String[] args) Test program to output the sequence of collation element iterators for a given input string
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

RuleBasedSubstringMatcher

public RuleBasedSubstringMatcher(RuleBasedCollator collator)

Create a RuleBasedSubstringMatcher

Parameters:

collator - the collation to be used

Method Detail

getUnderlyingCollator

public RuleBasedCollator getUnderlyingCollator()

Get the underlying RuleBasedCollator

Returns:

the RuleBasedCollator that does the work

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

compareStrings

public int compareStrings(String o1,
                          String o2)

Compare two strings

Specified by:

compareStrings in interface StringCollator

Parameters:

o1 - the first string

o2 - the second string

Returns:

0 if the strings are considered equal, a negative integer if the first string is less than the second, a positive integer if the first string is greater than the second

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

main

public static void main(String[] args)
                 throws Exception

Test program to output the sequence of collation element iterators for a given input string

Parameters:

args - command line arguments (collationURI, test-string)

Throws:

Exception