public boolean isTishaBav() {
    int holidayIndex = getYomTovIndex();
    return holidayIndex == TISHA_BEAV;
}

public boolean isRoshChodesh() {
    int holidayIndex = getYomTovIndex();
    return holidayIndex == ROSH_CHODESH;
}

public boolean isYaalehVyavo() {
     return isRoshChodesh() || isCholHamoedPesach() || isCholHamoedSuccos();
}

public boolean isPurim() {
    int holidayIndex = getYomTovIndex();
    return holidayIndex == PURIM;
}

public boolean isAlHanissim() {
    return isPurim() || isChanukah();
}