mffs/src/main/java/mffs/TransferMode.java

package mffs;

public enum TransferMode {
  EQUALIZE,
  DISTRIBUTE,
  DRAIN,
  FILL;

  public TransferMode toggle() {
    int newOrdinal = this.ordinal() + 1;
    if (newOrdinal >= values().length) {
      newOrdinal = 0;
    }
    return values()[newOrdinal];
  }
}