code: private void validate() {
  
      if ((this.segments.length < 0) && (!this.snapshot)) {
        throw new IllegalArgumentException("segments.length:" + Integer.valueOf(this.segments.length));
      }
      for (int i = 0; i < this.segments.length; i++) {
        if (this.segments[i] < 0) {
          throw new IllegalArgumentException("segments[" + i + "]:" + Integer.valueOf(this.segments[i]));
        }
      }
      if (this.phaseNumber != null) {
        if (this.phaseNumber.intValue() < 0) {
          throw new IllegalArgumentException("phaseNumber:" + this.phaseNumber);
        }
        if (this.phase == null) {
          throw new IllegalArgumentException("phaseNumber (phase==null):" + this.phaseNumber);
        }
        if ((this.phase == DevelopmentPhase.RELEASE) && (this.phaseNumber.intValue() != 0)) {
          throw new IllegalArgumentException("phaseNumber (phase==RELEASE):" + this.phaseNumber);
        }
      }
    }
docs: This method validates the consistency of this version identifier.