Thai Currency

Currency.java

/*
 * (c) nuboat.net 2012
 */
package net.nuboat.currency;

/**
 *
 * @author nuboat
 */
import java.util.StringTokenizer;

public class Currency {
   private String txtNum[] = {"ศูนย์", "หนึ่ง", "สอง", "สาม", "สี่", "ห้า", "หก", "เจ็ด", "แปด", "เก้า"};
   private String txtWeight[] = {"", "สิบ", "ร้อย", "พัน", "หมื่น", "แสน"};

   private String subfix;
   private String currency;
   private boolean isSubfix;

   public Currency(String currency) {
       this(currency, null);
   }

   public Currency(String currency, String subfix) {
       this.currency = currency;
       this.isSubfix = subfix != null ? true : false;
       this.subfix = subfix;
   }

   public String getBath() throws NumberFormatException {
       String number = currency;

       if (number == null) {
           throw new NumberFormatException("ข้อมูลเป็นค่า null (Null Value)");
       }

       number = number.replaceAll(",", "");
       number = number.replaceAll(" ", "");

       if (number.equals("")) {
           throw new NumberFormatException("ข้อมูลเป็นค่าว่าง (Blank Value)");
       }

       for (int i = 0; i < number.length(); i++) {
           if ((number.charAt(i) < '0' || number.charAt(i) > '9') &&
               number.charAt(i) != '.') {
               throw new NumberFormatException("ข้อมูลมีตัวอักขระ (Alphabet Value)");
           }
       }

       if (number.charAt(0) == '.') {
           number = "0" + number;
       }

       if (number.charAt(number.length() - 1) == '.') {
           number += "0";
       }

       StringTokenizer st = new StringTokenizer(number, ".");
       String beforeDot = st.nextToken();
       String afterDot = (st.hasMoreTokens()) ? st.nextToken() : null; // ทศนิยม

       if (st.hasMoreTokens()) {
           throw new NumberFormatException("ทศนิยมมากกว่า 1 ตัว");
       }

       boolean beforeDotIsZero = isZero(beforeDot); // ดูว่าหน้าทศนิยมเป็น 0 หรือไม่
       boolean afterDotIsZero = (afterDot == null) || // ดูว่าหลังทศนิยมเป็น 0 หรือไม่
                                (afterDot != null && isZero(afterDot));

       if (beforeDotIsZero && afterDotIsZero) {
           StringBuilder zero = new StringBuilder(0);
           zero.append("ศูนย์บาท");
           if (this.isSubfix) {
               zero.append(this.subfix);
           }
           return zero.toString();
       }

       StringBuilder result = new StringBuilder(0);

       if (!beforeDotIsZero) {
           String[] beforeDotArr = splitString(beforeDot);
           for (int i = 0; i < beforeDotArr.length; i++) {
               result.append(genStringNumber(beforeDotArr[i]));
               if (i + 1 < beforeDotArr.length) {
                   result.append("ล้าน");
               }
               else {
                   result.append("บาท");
               }
           }
       }

       if (afterDotIsZero) {
           if (this.isSubfix) {
               result.append(this.subfix);
           }
       } else {
           if (afterDot.length() > 2) {
               afterDot = afterDot.substring(0, 2);
           }
           if (afterDot.length() == 1) {
               afterDot += "0";
           }

           String[] afterDotArr = splitString(afterDot);
           for (int i = 0; i < afterDotArr.length; i++) {
               result.append(genStringNumber(afterDotArr[i]));
               if (i + 1 < afterDotArr.length) {
                   result.append("ล้าน");
               }
               else {
                   result.append("สตางค์");
               }
           }
       }
       return result.toString();
   }

   private boolean isZero(String number) {
       for (int i = 0; i < number.length(); i++) {
           if (number.charAt(i) != '0') {
               return false;
           }
       }
       return true;
   }

   private String[] splitString(String number) {
       String result[];
       int lengthNumber = number.length();
       int sizeArr = lengthNumber / 6;
       int n = lengthNumber % 6;

       sizeArr += n > 0 ? 1 : 0;
       result = new String[sizeArr];

       int indexString = 0;
       int indexArr = 0;
       if (n > 0) {
           result[indexArr++] = number.substring(indexString, n);
           indexString += n;
       }

       for (int i = indexArr; i < sizeArr; i++) {
           result[indexArr++] = number.substring(indexString, indexString + 6);
           indexString += 6;
       }
       return result;
   }

   private String genStringNumber(String number) {
       StringBuilder result = new StringBuilder(0);
       int length = number.length();

       for (int i = 0; i < length; i++) {
           char ch = number.charAt(i);
           if (ch != '0') {
               if (i == (length - 1) && ch == '1' &&
                   (Integer.parseInt(number) % 100 > 10)) {
                   result.append("เอ็ด"); // ดัก เลข 1 ในกรณีที่มากกว่า 10 ให้แสดงเป็น เอ็ด
               } else if (i == (length - 2) && ch == '2') {
                   result.append("ยี่"); // ดักเลข 20 -> ยี่สิบ
               } else if (i == (length - 2) && ch == '1') {
                   result.append(""); // ดักเลข 10 -> สิบ ไม่ใช่ หนึ่งสิบ
               } else {
                   result.append(this.txtNum[((int) ch) - 48]);
               }
               result.append(this.txtWeight[length - i - 1]);
           }
       }
       return result.toString();
   }

}