Semantic Versioning class for Groovy #groovy

SemVer.groovy

enum PatchLevel {
    MAJOR, MINOR, PATCH
}

class SemVer implements Serializable {

    private int major, minor, patch

    SemVer(String version) {
        def versionParts = version.tokenize('.')
        println versionParts
        if (versionParts.size != 3) {
            throw new IllegalArgumentException("Wrong version format - expected MAJOR.MINOR.PATCH - got ${version}")
        }
        this.major = versionParts[0].toInteger()
        this.minor = versionParts[1].toInteger()
        this.patch = versionParts[2].toInteger()
    }

    SemVer(int major, int minor, int patch) {
        this.major = major
        this.minor = minor
        this.patch = patch
    }

    SemVer bump(PatchLevel patchLevel) {
        switch (patchLevel) {
            case PatchLevel.MAJOR:
                return new SemVer(major + 1, 0, 0)
                break
            case PatchLevel.MINOR:
                return new SemVer(major, minor + 1, 0)
                break
            case PatchLevel.PATCH:
                return new SemVer(major, minor, patch + 1)
                break
        }
        return new SemVer()
    }

    String toString() {
        return "${major}.${minor}.${patch}"
    }

}

def version = new SemVer("0.0.1")
println(version.bump(PatchLevel.MAJOR).toString())
println(version.bump(PatchLevel.MINOR).toString())
println(version.bump(PatchLevel.PATCH).toString())

/*
  will output
  
  1.0.0
  0.1.0
  0.0.2

*/