javagit/src/main/java/edu/nyu/cs/javagit/api/commands/GitBranchOptions.java
public void setOptMLower(boolean optMLower) {
    checkCanSetRenameOption("-m");
    if (optMLower && optMUpper) {
      throw new IllegalArgumentException(ExceptionMessageMap.getMessage("000120")
          + "  -m cannot be used with -M.");
    } 
    this.optMLower = optMLower;
  }
public void setOptMLower(boolean optMLower) {
    checkCanSetRenameOption("-m");
    if (optMLower && optMUpper) {
      throw new IllegalArgumentException(ExceptionMessageMap.getMessage("000120")
          + "  -m cannot be used with -M.");
    } 
    this.optMLower = optMLower;
  }
Checks whether the -m option should be set and sets it.

@param optMLower True if the -m option should be used, false otherwise.