workspace/.metadata/.plugins/org.eclipse.core.resources/.history/0/80d0300c106b001115b7b82f2f4ce01a

   1 package com.yuji.tdb.utility;
   2
   3 import java.util.regex.Pattern;
   4
   5 public class StringUtility {
   6         private static Pattern ptnAlnum = Pattern.compile("[a-zA-Z0-9]");
   7         private static Pattern ptnSpace = Pattern.compile("\\s");
   8         private static Pattern ptnAscii = Pattern.compile("\\p{ASCII}");
   9
  10         public static String parseSubstring(String text, int length){
  11                 int len = text.length();
  12                 int status = -1;
  13                 int pos = 0;
  14
  15                 for (int i = 0; i < len + 1 && i < length + 1; i++){
  16                         if (i >= len){
  17                                 pos = i;
  18                                 break;
  19                         }
  20                         String ch = text.substring(i, i + 1);
  21
  22                         if (ptnAlnum.matcher(ch).matches()){
  23                                 if (status != 0){
  24                                         if (status != 1){
  25                                                 pos = i;
  26                                         }
  27                                         status = 0;
  28                                 }
  29                         }
  30                         else if (ptnSpace.matcher(ch).matches()){
  31                                 if (status != 1){
  32                                         pos = i;
  33                                         status = 1;
  34                                 }
  35                         }
  36                         else if (ptnAscii.matcher(ch).matches()){
  37                                 if (status != 2){
  38                                         if (status != 1){
  39                                                 pos = i;
  40                                         }
  41                                         status = 2;
  42                                 }
  43                         }
  44                         else {
  45                                 pos = i;
  46                                 status = 3;
  47                         }
  48                 }
  49                 if (pos == 0){
  50                         return text.substring(0, (len < length)? len : length);
  51                 }
  52                 return text.substring(0, pos);
  53         }
  54 }