io.werval.util

Class Base62

java.lang.Object

io.werval.util.Base62

public final class Base62
extends Object

Base62 numbers/strings encoding/decoding utility methods.

Only positive numbers are supported. All methods in this class with throw an IllegalArgumentException if a negative number is given. If you want to use negative numbers you'll have to handle prepending - to the Base62 string, that becomes a sort of Base62+1 string.

Here is sample code to handle negative numbers prepending - to them:

 long number = -1234567890;
 String enc = ( Math.abs( number ) != number ? "-" : "" ) + Base62.encode( Math.abs( number ) );
 long dec = enc.startsWith( "-" ) ? -Base62.decodeLong( enc.substring( 1 ) ) : Base62.decodeLong( enc );
 

Note that this isn't true Base62 anymore.

Method Summary

Modifier and Type	Method and Description
static BigInteger	decode(String base62String)
static BigInteger	decode(String base62String, Charset charset)
static byte[]	decodeBytes(String base62String)
static byte[]	decodeBytes(String base62String, Charset charset)
static int	decodeInt(String base62String)
static int	decodeInt(String base62String, Charset charset)
static long	decodeLong(String base62String)
static long	decodeLong(String base62String, Charset charset)
static String	encode(BigInteger number)
static String	encode(byte[] bytes)
static String	encode(Integer number)
static String	encode(Long number)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

decode

public static BigInteger decode(String base62String)

decode

public static BigInteger decode(String base62String,
                                Charset charset)

decodeInt

public static int decodeInt(String base62String)
                     throws ArithmeticException

Throws:

ArithmeticException

decodeInt

public static int decodeInt(String base62String,
                            Charset charset)
                     throws ArithmeticException

Throws:

ArithmeticException

decodeLong

public static long decodeLong(String base62String)
                       throws ArithmeticException

Throws:

ArithmeticException

decodeLong

public static long decodeLong(String base62String,
                              Charset charset)
                       throws ArithmeticException

Throws:

ArithmeticException

decodeBytes

public static byte[] decodeBytes(String base62String)
                          throws ArithmeticException

Throws:

ArithmeticException

decodeBytes

public static byte[] decodeBytes(String base62String,
                                 Charset charset)
                          throws ArithmeticException

Throws:

ArithmeticException

encode

public static String encode(Integer number)

encode

public static String encode(Long number)

encode

public static String encode(byte[] bytes)

encode

public static String encode(BigInteger number)