uuid-compactor

Encodes UUID into URL-safe string of 22 or 26 characters, and vice versa.

Motivation

A UUID string is 36 characters, e.g. be177dbe-5639-4ee1-90b1-09e108ffdddc.

There are various reasons to want to represent a UUID in a shorter string.

A UUID can be Base64 encoded to a URL-safe string of 22 characters.
Or for an extra 4 characters, Base32 encoded to 26 characters.

The advantage of using Base32 is that the encoding alphabets are unambiguous;
they are all the upper case letters A to Z, and the digits 2 to 7,
no 0, 1, 8 to confuse with O, I, l, B.

Usage

repositories {
    jcenter()
}
dependencies {
    implementation("com.ctzen.util:uuid-compactor:<version>")
}

// Create compactor, or inject as singleton, it is thread-safe.
static final UuidCompactor compactor = new UuidCompactor();
UUID uuid = UUID.randomUUID();
// compact
String compactUuid = compactor.compact64(uuid);
// expand
UUID uuid2 = compactor.expand64(compactUuid);
assert uuid2.equals(uuid);

build

$ ./gradlew build