package kimiko.coreen.app.data.tools;

public class StringTools {                                            
	private static int minimum(int a, int b, int c) {                            
		return Math.min(Math.min(a, b), c);                                      
	}                                                                            

	public static int LDistance(String str1,String str2) {      
		int[][] distance = new int[str1.length() + 1][str2.length() + 1];        

		for (int i = 0; i <= str1.length(); i++)                                 
			distance[i][0] = i;                                                  
		for (int j = 1; j <= str2.length(); j++)                                 
			distance[0][j] = j;                                                  

		for (int i = 1; i <= str1.length(); i++)                                 
			for (int j = 1; j <= str2.length(); j++)                             
				distance[i][j] = minimum(                                        
						distance[i - 1][j] + 1,                                  
						distance[i][j - 1] + 1,                                  
						distance[i - 1][j - 1] + ((str1.charAt(i - 1) == str2.charAt(j - 1)) ? 0 : 1));

		return distance[str1.length()][str2.length()];                           
	}
}
