@Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((mediaName == null) ? 0 : mediaName.hashCode());
        result = prime * result + ((date == null) ? 0 : date.get(Calendar.MONTH));
        result = prime * result + ((date == null) ? 0 : date.get(Calendar.YEAR));
        result = prime * result + ((artName == null) ? 0 : artName.hashCode());
        return result;
    }