task/constraints/WeekDayConstraint.java

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/*
 * Turró i Cutiller Foundation. License notice.
 * Copyright (C) 2022 Lluis Turró Cutiller <http://www.turro.org/>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
package org.turro.scheduler.task.constraints;
 
import java.util.Calendar;
import java.util.Date;
import java.util.HashSet;
 
public class WeekDayConstraint extends HashSet<WeekDay> {
 
  private WeekDay lastCheck;
  private boolean refresh;
 
  public boolean isValid(Date date) {
    refresh = false;
    WeekDay wd = getWeekDay(date);
    if(wd != null && contains(wd)) {
      refresh = !wd.equals(lastCheck);
      lastCheck = wd;
      return true;
    }
    lastCheck = wd;
    return isEmpty();
  }
 
  public boolean needsRefresh() {
    return refresh;
  }
 
  public WeekDay getWeekDay(Date date) {
    Calendar c = Calendar.getInstance();
    c.setTime(date);
    return switch(c.get(Calendar.DAY_OF_WEEK)) {
      case Calendar.MONDAY -> WeekDay.MONDAY;
      case Calendar.TUESDAY -> WeekDay.TUESDAY;
      case Calendar.WEDNESDAY -> WeekDay.WEDNESDAY;
      case Calendar.THURSDAY -> WeekDay.THURSDAY;
      case Calendar.FRIDAY -> WeekDay.FRIDAY;
      case Calendar.SATURDAY -> WeekDay.SATURDAY;
      case Calendar.SUNDAY -> WeekDay.SUNDAY;
      default -> null;
    };
  }
 
}