org.apache.lucene.search.spell
Class JaroWinklerDistance

java.lang.Object
  org.apache.lucene.search.spell.JaroWinklerDistance

All Implemented Interfaces:

StringDistance

public class JaroWinklerDistance
extends Object
implements StringDistance

Similarity measure for short strings such as person names.

See Also:

http://en.wikipedia.org/wiki/Jaro%E2%80%93Winkler_distance

Constructor Summary

JaroWinklerDistance()

Method Summary

float	getDistance(String s1, String s2) Returns a float between 0 and 1 based on how similar the specified strings are to one another.
float	getThreshold() Returns the current value of the threshold used for adding the Winkler bonus.
void	setThreshold(float threshold) Sets the threshold used to determine when Winkler bonus should be used.

Methods inherited from class java.lang.Object

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

Constructor Detail

JaroWinklerDistance

public JaroWinklerDistance()

Method Detail

getDistance

public float getDistance(String s1,
                         String s2)

Description copied from interface: StringDistance

Returns a float between 0 and 1 based on how similar the specified strings are to one another. Returning a value of 1 means the specified strings are identical and 0 means the string are maximally different.

Specified by:

getDistance in interface StringDistance

Parameters:

s1 - The first string.

s2 - The second string.

Returns:

a float between 0 and 1 based on how similar the specified strings are to one another.

setThreshold

public void setThreshold(float threshold)

Sets the threshold used to determine when Winkler bonus should be used. Set to a negative value to get the Jaro distance.

Parameters:

threshold - the new value of the threshold

getThreshold

public float getThreshold()

Returns the current value of the threshold used for adding the Winkler bonus. The default value is 0.7.

Returns:

the current value of the threshold