de.fuberlin.wiwiss.semmf.engine
Class StringMatcher

java.lang.Object
  de.fuberlin.wiwiss.semmf.engine.StringMatcher

All Implemented Interfaces:

Matcher

public class StringMatcher
extends java.lang.Object
implements Matcher

A class providing functionality for matching two semantically corresponding String values.

Version:

1.3 last modified 29.11.2006

Author:

Radoslaw Oldakowski

Field Summary

static boolean	CASE_SENSITIVE These constants should be used while instancing a new StringMatcher
private boolean	caseSensitive Setting for a particular instance of StringMatcher
static boolean	IGNORE_CASE

Constructor Summary

StringMatcher()
Constructor with default setting = ignore case

StringMatcher(boolean caseSensitive)
Constructor.

Method Summary

float	calcSim(com.hp.hpl.jena.rdf.model.RDFNode n1, com.hp.hpl.jena.rdf.model.RDFNode n2) Calculates the similarity of two given RDFNodes from Jena2 framework.
private float	calcStringSim(java.lang.String s1, java.lang.String s2) Calculates the similarity of two given strings according to the setting (case (in)sensitive) of this StringMatcher.
boolean	isCaseSensitive() Returns true if the matcher performs case sensitive matching

Methods inherited from class java.lang.Object

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

Field Detail

CASE_SENSITIVE

public static final boolean CASE_SENSITIVE

These constants should be used while instancing a new StringMatcher

See Also:

Constant Field Values

IGNORE_CASE

public static final boolean IGNORE_CASE

See Also:

Constant Field Values

caseSensitive

private boolean caseSensitive

Setting for a particular instance of StringMatcher

Constructor Detail

StringMatcher

public StringMatcher()

Constructor with default setting = ignore case

StringMatcher

public StringMatcher(boolean caseSensitive)

Constructor. While insstancing a StringMatcher use the predefined constants

Parameters:

caseSensitive - indicates if the matching should be case sensitive or not.

Method Detail

calcStringSim

private float calcStringSim(java.lang.String s1,
                            java.lang.String s2)

Calculates the similarity of two given strings according to the setting (case (in)sensitive) of this StringMatcher. There are only two results possible, that is 1 if the given strings are identical or 0 if there are different.

Parameters:

s1 - string serialization of the node from the query graph

s2 - string serialization of the node from the resource graph

Returns:

the similarity of these nodes

isCaseSensitive

public boolean isCaseSensitive()

Returns true if the matcher performs case sensitive matching

Returns:

boolean

calcSim

public float calcSim(com.hp.hpl.jena.rdf.model.RDFNode n1,
                     com.hp.hpl.jena.rdf.model.RDFNode n2)

Calculates the similarity of two given RDFNodes from Jena2 framework. The similarity is based on the string serialization of these objects. Thus, in the case of two literals not only their value but moreover their language and datatype will be respected.

Specified by:

calcSim in interface Matcher

Parameters:

n1 - node from the query graph

n2 - node from the resource graph

Returns:

the similarity of these nodes