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

@param optMUpper True if the -M option should be used, false otherwise.