Remove a warning.

[Persons_Comparator.git] / src / LevenshteinDistance.java

public class LevenshteinDistance {
    /**
     * @param a
     * @param b
     * @param c
     * @return
     */
    private static int minimum(int a, int b, int c) {
        return Math.min(Math.min(a, b), c);
    }

    /**
     * @param lhs
     * @param rhs
     * @return
     */
    public static int computeLevenshteinDistance(CharSequence lhs, CharSequence rhs) {
        int[][] distance = new int[lhs.length() + 1][rhs.length() + 1];

        for (int i = 0; i <= lhs.length(); i++)
            distance[i][0] = i;
        for (int j = 1; j <= rhs.length(); j++)
            distance[0][j] = j;

        for (int i = 1; i <= lhs.length(); i++)
            for (int j = 1; j <= rhs.length(); j++)
                distance[i][j] = minimum(
                        distance[i - 1][j] + 1,
                        distance[i][j - 1] + 1,
                        distance[i - 1][j - 1] + ((lhs.charAt(i - 1) == rhs.charAt(j - 1)) ? 0 : 1));

        return distance[lhs.length()][rhs.length()];
    }
}