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Added JavaScript version for BigInteger and modify the Java version #4

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Added JavaScript version for BigInteger and modify the Java version #4

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423c865
1. Support String parse for very large integer.
Oct 4, 2015
75a9cc9
Add support for Big Integer.
Oct 7, 2015
5811c97
Adjust some minor things for merge
Oct 28, 2015
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36 changes: 36 additions & 0 deletions Java/ShortURL.java
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Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,9 @@
*
* Source: https://github.com/delight-im/ShortURL (Apache License 2.0)
*/

import java.math.BigInteger;

public class ShortURL {

public static final String ALPHABET = "23456789bcdfghjkmnpqrstvwxyzBCDFGHJKLMNPQRSTVWXYZ-_";
Expand All @@ -31,9 +34,42 @@ public static String encode(int num) {
public static int decode(String str) {
int num = 0;
for (int i = 0; i < str.length(); i++) {
char c = str.charAt(i);
if (ALPHABET.indexOf(c) < 0) {
num = -1;
break;
}
num = num * BASE + ALPHABET.indexOf(str.charAt(i));
}
return num;
}

public static String encode(String num) throws NumberFormatException {
BigInteger bnum = new BigInteger(num);
BigInteger bBase = new BigInteger(Integer.toString(BASE));
StringBuilder str = new StringBuilder();
while (bnum.compareTo(BigInteger.ZERO) > 0) {
int n = bnum.mod(bBase).intValue();
str.insert(0, ALPHABET.charAt(n));
bnum = bnum.divide(bBase);
}

return str.toString();
}

public static BigInteger decodeWithBigNumber(String str) {
BigInteger bNum = new BigInteger("0");
BigInteger bBase = new BigInteger(Integer.toString(BASE));
for (int i = 0; i < str.length(); i++) {
char c = str.charAt(i);
if (ALPHABET.indexOf(c) < 0) {
bNum = new BigInteger("-1");
break;
}
BigInteger br = new BigInteger(Integer.toString(ALPHABET.indexOf(c)));
bNum = bNum.multiply(bBase).add(br);
}

return bNum;
}
}
30 changes: 30 additions & 0 deletions JavaScript/ShortURL.js
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Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,9 @@
*
* Source: https://github.com/delight-im/ShortURL (Apache License 2.0)
*/

var bigInt = require("big-integer");

var ShortURL = new function() {

var _alphabet = '23456789bcdfghjkmnpqrstvwxyzBCDFGHJKLMNPQRSTVWXYZ-_',
Expand All @@ -28,6 +31,20 @@ var ShortURL = new function() {
return str;
};

/**
* @param {num} input number represented by string
* @return {str} encoded short url
*/
this.encodeBigInteger = function (num) {
var str = '';
var bNum = bigInt(num);
while (bNum.compare(0) == 1) {
str = _alphabet.charAt(bNum.mod(_base)) + str;
bNum = bNum.divide(_base);
}
return str;
}

this.decode = function(str) {
var num = 0;
for (var i = 0; i < str.length; i++) {
Expand All @@ -36,4 +53,17 @@ var ShortURL = new function() {
return num;
};


/**
* @param {str} ShortURL represented by string
* @return {str} decoded number represented by string
*/
this.decodeBigInteger = function(str) {
var bNum = bigInt(0);
for (var i = 0; i < str.length; i++) {
bNum = bNum.multiply(_base).add(_alphabet.indexOf(str.charAt(i)));
}
return bNum;
}

};