| 修订版 | 14 (tree) |
|---|---|
| 时间 | 2010-04-28 20:45:14 |
| 作者 | (del#42041) |
added java version of edit distance
src/edit.java (diff)| @@ -0,0 +1,71 @@ | ||
| 1 | +//package libsvm; | |
| 2 | +import java.io.*; | |
| 3 | +import java.util.*; | |
| 4 | + | |
| 5 | +class LevenshteinDistance | |
| 6 | +{ | |
| 7 | + private int isutf8(String args) throws UnsupportedEncodingException | |
| 8 | + { | |
| 9 | + int ret = -1; | |
| 10 | + byte[] c = args.getBytes("UTF-8"); | |
| 11 | + if((c[0]&0x80) == 0x00) ret = 1; | |
| 12 | + else if((c[0]&0xe0) == 0xc0 && (c[1]&0xc0) == 0x80) ret = 2; | |
| 13 | + else if((c[0]&0xf0) == 0xe0 && (c[1]&0xc0) == 0x80 && (c[2]&0xc0) == 0x80 ) ret = 3; | |
| 14 | + return(ret); | |
| 15 | + } | |
| 16 | + Boolean equal(String s1, String s2) throws UnsupportedEncodingException | |
| 17 | + { | |
| 18 | + Boolean ret = false; | |
| 19 | + if(isutf8(s1)==isutf8(s2)) | |
| 20 | + { | |
| 21 | + int f=0; | |
| 22 | + for(int i=0;i<isutf8(s1);++i) | |
| 23 | + { | |
| 24 | + byte[] c1 = s1.getBytes("UTF-8"); | |
| 25 | + byte[] c2 = s2.getBytes("UTF-8"); | |
| 26 | + if(c1[i]==c2[i]) ++f; | |
| 27 | + } | |
| 28 | + if(f==isutf8(s1)) ret = true; | |
| 29 | + } | |
| 30 | + return(ret); | |
| 31 | + } | |
| 32 | + int edit(String px, String py) throws UnsupportedEncodingException | |
| 33 | + { | |
| 34 | + Vector<Vector> row = new Vector<Vector>(); | |
| 35 | + int len1=0,len2=0; | |
| 36 | + int i,j; | |
| 37 | + int result; | |
| 38 | + len1 = px.length(); | |
| 39 | + len2 = py.length(); | |
| 40 | + for(i=0; i<len1+1; ++i) | |
| 41 | + { | |
| 42 | + row.add(new Vector()); | |
| 43 | + for(j=0; j<len2+1; ++j) | |
| 44 | + { | |
| 45 | + row.get(i).add(0); | |
| 46 | + } | |
| 47 | + } | |
| 48 | + | |
| 49 | + for(i=0;i<len1+1;i++) row.get(i).set(0,i); | |
| 50 | + for(i=0;i<len2+1;i++) row.get(0).set(i,i); | |
| 51 | + for(i=1;i<=len1;++i) | |
| 52 | + { | |
| 53 | + for(j=1;j<=len2;++j) | |
| 54 | + { | |
| 55 | + row.get(i).set(j,Math.min(Math.min( | |
| 56 | + (Integer)(row.get(i-1).get(j-1)) + (equal(px.substring(i-1),py.substring(j-1))?0:1) , // replace | |
| 57 | + (Integer)(row.get(i).get(j-1)) + 1), // delete | |
| 58 | + (Integer)(row.get(i-1).get(j)) + 1 )); // insert | |
| 59 | + } | |
| 60 | + } | |
| 61 | + result=(Integer)(row.get(len1).get(len2)); | |
| 62 | + | |
| 63 | + return result; | |
| 64 | + } | |
| 65 | + | |
| 66 | + public static void main(String[] args) throws UnsupportedEncodingException | |
| 67 | + { | |
| 68 | + LevenshteinDistance ld = new LevenshteinDistance() ; | |
| 69 | + System.out.println(ld.edit("あい","あうう")); | |
| 70 | + } | |
| 71 | +} | |
| \ No newline at end of file |
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