Words.java

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package com.runehive.util;
 
/**
 * This class specially written to convert the given number into words. It will
 * support upto 1 crore.
 * 
 * @author SANTHOSH REDDY MANDADI
 * @version release: 2_0_48
 * @since April 03 2008
 */
public class Words {
    long num;
 
    private Words() {
        num = 0;
    }
 
    private Words(long num) {
        this.num = num;
    }
 
    public void setNumber(long num) {
        this.num = num;
    }
 
    public long getNumber() {
        return num;
    }
 
    public static Words getInstance(long num) {
        return new Words(num);
    }
 
    public static String leftChars(String str, int n) {
        if (str.length() <= n)
            return str;
        else
            return str.substring(0, n);
    }
 
    public static String rightChars(String str, int n) {
        if (str.length() <= n)
            return str;
        else
            return str.substring(str.length() - n);
    }
 
    public long leftChars(int n) {
        return Long.parseLong(leftChars(Long.toString(num), n));
    }
 
    public long rightChars(int n) {
        return Long.parseLong(rightChars(Long.toString(num), n));
    }
 
    public long leftChars(long num, int n) {
        return Long.parseLong(leftChars(Long.toString(num), n));
    }
 
    public long rightChars(long num, int n) {
        return Long.parseLong(rightChars(Long.toString(num), n));
    }
 
    public int length(long num) {
        return Long.toString(num).length();
    }
 
    private String belowTen(long x) {
        switch ((int) x) {
        case 1:
            return "One ";
        case 2:
            return "Two ";
        case 3:
            return "Three ";
        case 4:
            return "Four ";
        case 5:
            return "Five ";
        case 6:
            return "Six ";
        case 7:
            return "Seven ";
        case 8:
            return "Eight ";
        case 9:
            return "Nine ";
        }
        return "";
    }
 
    private String belowTwenty(long x) {
        if (x < 10)
            return belowTen(x);
        switch ((int) x) {
        case 10:
            return "Ten ";
        case 11:
            return "Eleven ";
        case 12:
            return "Twelve ";
        case 13:
            return "Thirteen ";
        case 14:
            return "Fourteen ";
        case 15:
            return "Fifteen ";
        case 16:
            return "Sixteen ";
        case 17:
            return "Seventeen ";
        case 18:
            return "Eighteen ";
        case 19:
            return "Nineteen ";
        }
        return "";
    }
 
    private String belowHundred(long x) {
        if (x < 10)
            return belowTen(x);
        else if (x < 20)
            return belowTwenty(x);
        switch ((int) leftChars(x, 1)) {
        case 2:
            return "Twenty " + belowTen(rightChars(x, 1));
        case 3:
            return "Thirty " + belowTen(rightChars(x, 1));
        case 4:
            return "Fourty " + belowTen(rightChars(x, 1));
        case 5:
            return "Fifty " + belowTen(rightChars(x, 1));
        case 6:
            return "Sixty " + belowTen(rightChars(x, 1));
        case 7:
            return "Seventy " + belowTen(rightChars(x, 1));
        case 8:
            return "Eighty " + belowTen(rightChars(x, 1));
        case 9:
            return "Ninety " + belowTen(rightChars(x, 1));
        }
        return "";
    }
 
    private String belowThousand(long x) {
        if (x < 10)
            return belowTen(x);
        else if (x < 20)
            return belowTwenty(x);
        else if (x < 100)
            return belowHundred(x);
        return belowTen(leftChars(x, 1)) + "Hundred " + belowHundred(rightChars(x, 2));
    }
 
    private String belowLakh(long x) {
        if (x < 10)
            return belowTen(x);
        else if (x < 20)
            return belowTwenty(x);
        else if (x < 100)
            return belowHundred(x);
        else if (x < 1000)
            return belowThousand(x);
        if (length(x) == 4)
            return belowTen(leftChars(x, 1)) + "Thousand " + belowThousand(rightChars(x, 3));
        else
            return belowHundred(leftChars(x, 2)) + "Thousand " + belowThousand(rightChars(x, 3));
    }
 
    public String belowCrore(long x) {
        if (x < 10)
            return belowTen(x);
        else if (x < 20)
            return belowTwenty(x);
        else if (x < 100)
            return belowHundred(x);
        else if (x < 1000)
            return belowThousand(x);
        else if (x < 100000)
            return belowLakh(x);
        if (length(x) == 6)
            return belowTen(leftChars(x, 1)) + "Lakh " + belowLakh(rightChars(x, 5));
        else
            return belowHundred(leftChars(x, 2)) + "Lakh " + belowLakh(rightChars(x, 5));
    }
 
    public String belowBillion(long x) {
        if (x < 10)
            return belowTen(x);
        else if (x < 20)
            return belowTwenty(x);
        else if (x < 100)
            return belowHundred(x);
        else if (x < 1000)
            return belowThousand(x);
        else if (x < 100000)
            return belowLakh(x);
        else if (x < 100000000)
            return belowCrore(x);
 
        if (length(x) == 8)
            return belowTen(leftChars(x, 1)) + "Bilion " + belowCrore(rightChars(x, 7));
        else
            return belowHundred(leftChars(x, 2)) + "Bilion " + belowCrore(rightChars(x, 7));
    }
 
    public String getNumberInWords() {
        if (num < 10)
            return belowTen(num);
        else if (num < 20)
            return belowTwenty(num);
        else if (num < 100)
            return belowHundred(num);
        else if (num < 1000)
            return belowThousand(num);
        else if (num < 100000)
            return belowLakh(num);
        else if (num < 10000000)
            return belowCrore(num);
        else if (num < 1000000000)
            return belowBillion(num);
        return "";
    }
 
}