gistfile1.java

   public static String toUrlFriendlyCS(String str) {
      if(str == null) {
         return null;
      }

      str = removePunctuationCharacters(str, " "); // todo, implement through chars array
      str = removeDuplicateWhitespaces(str, " "); // todo, implement through chars array
      str = str.trim();

      char[] chars = new char[str.length()];
      StringBuilder builder = new StringBuilder();
      str.getChars(0, str.length(), chars, 0);
      char charHandled = 0;

      for(char c : chars) {
         if(c == 46 || c == 45 || (c >= 97 && c <= 122) || (c >= 65 && c <= 90) || (c >= 48 && c <= 57)) {
            builder.append(c);
         } else if(c == '&') {
            builder.append("ve");
         } else if(c == '\u011F') {
            builder.append("g");
         } else if(c == '\u011E') {
            builder.append("G");
         } else if(c == '\u0131') {
            builder.append("i");
         } else if(c == '\u0130') {
            builder.append("I");
         } else if(c == '\u00FC') {
            builder.append("u");
         } else if(c == '\u00DC') {
            builder.append("U");
         } else if(c == '\u015F') {
            builder.append("s");
         } else if(c == '\u015E') {
            builder.append("S");
         } else if(c == '\u00F6') {
            builder.append("o");
         } else if(c == '\u00D6') {
            builder.append("O");
         } else if(c == '\u00E7') {
            builder.append("c");
         } else if(c == '\u00C7') {
            builder.append("C");
         } else if(c == ' ') {
            if(charHandled != 0 && charHandled != ' ' && charHandled != '-') {
               builder.append("-");
            }
         }

         charHandled = c;
      }

      return builder.toString();
   }


   public static String removePunctuationCharacters(String container, String replacement) {
      if(container == null || container.trim().equals("")) {
         return container;
      }

      StringBuffer sb = new StringBuffer();
      Matcher m = PATTERN_PUNCTUATION_CHARS.matcher(container);

      while(m.find()) {
         if(replacement != null) {
            m.appendReplacement(sb, replacement);
         } else {
            m.appendReplacement(sb, "");
         }
      }

      m.appendTail(sb);

      return sb.toString();
   }


   public static String removeDuplicateWhitespaces(String container, String replacement) {
      if(container == null || container.trim().equals("")) {
         return container;
      }

      StringBuffer sb = new StringBuffer();
      Matcher m = PATTERN_DUPLICATE_WHITESPACE.matcher(container);

      while(m.find()) {
         if(replacement != null) {
            m.appendReplacement(sb, replacement);
         } else {
            m.appendReplacement(sb, "");
         }
      }

      m.appendTail(sb);

      return sb.toString();
   }