info.debatty.java.stringsimilarity

Class OptimalStringAlignment

java.lang.Object

info.debatty.java.stringsimilarity.OptimalStringAlignment

All Implemented Interfaces:

StringDistance, Serializable

@Immutable
public final class OptimalStringAlignment
extends Object
implements StringDistance

Implementation of the the Optimal String Alignment (sometimes called the restricted edit distance) variant of the Damerau-Levenshtein distance. The difference between the two algorithms consists in that the Optimal String Alignment algorithm computes the number of edit operations needed to make the strings equal under the condition that no substring is edited more than once, whereas Damerau-Levenshtein presents no such restriction.

Author:

Michail Bogdanos

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
OptimalStringAlignment()

Method Summary

Modifier and Type	Method and Description
double	distance(String s1, String s2) Compute the distance between strings: the minimum number of operations needed to transform one string into the other (insertion, deletion, substitution of a single character, or a transposition of two adjacent characters) while no substring is edited more than once.

Methods inherited from class java.lang.Object

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

Constructor Detail

OptimalStringAlignment

public OptimalStringAlignment()

Method Detail

distance

public double distance(String s1,
                       String s2)

Compute the distance between strings: the minimum number of operations needed to transform one string into the other (insertion, deletion, substitution of a single character, or a transposition of two adjacent characters) while no substring is edited more than once.

Specified by:

distance in interface StringDistance

Parameters:

s1 - The first string to compare.

s2 - The second string to compare.

Returns:

the OSA distance

Throws:

NullPointerException - if s1 or s2 is null.