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1 package com.daffodilwoods.daffodildb.server.sql99.common;
2
3 import com.daffodilwoods.database.resource.*;
4
5 public class Soundex {
6 static final OctetMap alpha = new OctetMap('a', 'z');
7 static final OctetMap Alpha = new OctetMap('A', 'Z');
8 static {
9 Alpha.include('a', 'z');
10 }
11
12
13 static final String  sMap = "01230120022455012623010202";
14 static final char scode(int c) {
15 if (alpha.has(c)) {
16 return sMap.charAt(c - 'a');
17 } else {
18 return sMap.charAt(c - 'A');
19 }
20 }
21
22 public static final String soundex(String s) throws DException {
23 char[] ret = new char[4];
24 char last = 'x';
25 int pos = 0;
26 for (int i = 0; i < s.length() && pos < 4; i++) {
27 int c = s.charAt(i) & 0xff;
28 if (Alpha.has(c)) {
29 if (pos == 0) {
30 ret[pos++] = Character.toUpperCase( (char) c);
31 } else {
32 char code = scode(c);
33 if (code != '0' && code != last) {
34 ret[pos++] = code;
35 last = code;
36 }
37 }
38 }
39 }
40 while (pos < 4) {
41 ret[pos++] = '0';
42 }
43 return new String (ret);
44 }
45
46 public static final int difference(String a, String b) throws DException {
47 String sa = soundex(a);
48 String sb = soundex(b);
49 int diff = 0;
50 for (int i = 0; i < 4; i++) {
51 if (sa.charAt(i) == sb.charAt(i)) {
52 diff++;
53 }
54 }
55 return diff;
56 }
57 }
58 |
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