Monitored GregorianCalendar : Calendar Date « Development Class « Java

1. Java
2. Development Class
3. Calendar Date

Monitored GregorianCalendar

     


import java.util.*;

/**
 * @author Matthew D. Hicks
 *
 */
public class MonitoredGregorianCalendar extends GregorianCalendar {
  private ArrayList listeners;
  
  private boolean blocked;
  
  public MonitoredGregorianCalendar() {
    super();
    listeners = new ArrayList();
  }
  
  public MonitoredGregorianCalendar(int year, int month, int dayOfMonth) {
    super(year, month, dayOfMonth);
    listeners = new ArrayList();
  }
  
  public MonitoredGregorianCalendar(int year, int month, int dayOfMonth, int hourOfDay, int minute) {
    super(year, month, dayOfMonth, hourOfDay, minute);
    listeners = new ArrayList();
  }
  
  public MonitoredGregorianCalendar(int year, int month, int dayOfMonth, int hourOfDay, int minute, int second) {
    super(year, month, dayOfMonth, hourOfDay, minute, second);
    listeners = new ArrayList();
  }
  
  public MonitoredGregorianCalendar(Locale aLocale) {
    super(aLocale);
    listeners = new ArrayList();
  }
  
  public MonitoredGregorianCalendar(TimeZone zone) {
    super(zone);
    listeners = new ArrayList();
  }
  
  public void add(int field, int amount) {
    if (!blocked) {
      blocked = true;
      super.add(field, amount);
      blocked = false;
      changed(CalendarChangeListener.TYPE_ADD, field, amount);
    } else {
      super.add(field, amount);
    }
  }
  
  public void roll(int field, boolean up) {
    if (!blocked) {
      blocked = true;
      super.roll(field, up);
      blocked = false;
      int amount = 0;
      if (up) amount = 1;
      changed(CalendarChangeListener.TYPE_ROLL, field, amount);
    } else {
      super.roll(field, up);
    }
  }
  
  public void roll(int field, int amount) {
    if (!blocked) {
      blocked = true;
      super.roll(field, amount);
      blocked = false;
      changed(CalendarChangeListener.TYPE_ROLL, field, amount);
    } else {
      super.roll(field, amount);
    }
  }
  
  public void setGregorianChange(Date date) {
    if (!blocked) {
      blocked = true;
      super.setGregorianChange(date);
      blocked = false;
      changed(CalendarChangeListener.TYPE_SET, CalendarChangeListener.TIME_IN_MILLIS, date.getTime());
    } else {
      super.setGregorianChange(date);
    }
  }
  
  public void setTimeZone(TimeZone zone) {
    if (!blocked) {
      blocked = true;
      super.setTimeZone(zone);
      blocked = false;
      changed(CalendarChangeListener.TYPE_SET, CalendarChangeListener.TIME_ZONE, zone.getRawOffset());
    } else {
      super.setTimeZone(zone);
    }
  }
  
  public void set(int field, int value) {
    if (!blocked) {
      blocked = true;
      super.set(field, value);
      blocked = false;
      changed(CalendarChangeListener.TYPE_SET, field, value);
    } else {
      super.set(field, value);
    }
  }
  
  public void setFirstDayOfWeek(int value) {
    if (!blocked) {
      blocked = true;
      super.setFirstDayOfWeek(value);
      blocked = false;
      changed(CalendarChangeListener.TYPE_SET, CalendarChangeListener.FIRST_DAY_OF_WEEK, value);
    } else {
      super.setFirstDayOfWeek(value);
    }
  }
  
  public void setLenient(boolean lenient) {
    if (!blocked) {
      blocked = true;
      super.setLenient(lenient);
      blocked = false;
      int amount = 0;
      if (lenient) amount = 1;
      changed(CalendarChangeListener.TYPE_SET, CalendarChangeListener.LENIENT, amount);
    } else {
      super.setLenient(lenient);
    }
  }
  
  public void setMinimalDaysInFirstWeek(int value) {
    if (!blocked) {
      blocked = true;
      super.setMinimalDaysInFirstWeek(value);
      blocked = false;
      changed(CalendarChangeListener.TYPE_SET, CalendarChangeListener.MINIMAL_DAYS_IN_FIRST_WEEK, value);
    } else {
      super.setMinimalDaysInFirstWeek(value);
    }
  }
  
  public void setTimeInMillis(long millis) {
    if (!blocked) {
      blocked = true;
      super.setTimeInMillis(millis);
      blocked = false;
      changed(CalendarChangeListener.TYPE_SET, CalendarChangeListener.TIME_IN_MILLIS, millis);
    } else {
      super.setTimeInMillis(millis);
    }
  }
  
  private void changed(int type, int field, long value) {
    if ((listeners != null) && (!blocked)) {
      for (int i = 0; i < listeners.size(); i++) {
        ((CalendarChangeListener)listeners.get(i)).changed(this, type, field, value);
      }
    }
  }
  
  public void addListener(CalendarChangeListener listener) {
    listeners.add(listener);
  }
}


/**
 * @author Matthew D. Hicks
 *
 */
interface CalendarChangeListener {
  public static final int TYPE_ADD = 1;
  public static final int TYPE_ROLL = 2;
  public static final int TYPE_SET = 3;
  
  public static final int TIME_ZONE = 1;
  public static final int FIRST_DAY_OF_WEEK = 2;
  public static final int LENIENT = 3;
  public static final int MINIMAL_DAYS_IN_FIRST_WEEK = 4;
  public static final int TIME_IN_MILLIS = 5;
  
  /**
   * This method is called when a MonitoredGregorianCalendar changes.
   * 
   * @param c
   *    A reference to the MonitoredGregorianCalendar that has been changed.
   * @param type
   *    The type of change that occurred:
   *      TYPE_ADD, TYPE_ROLL, or TYPE_SET
   * @param field
   *    The field that was changed either a Calendar type or:
   *      TIME_ZONE, FIRST_DAY_OF_WEEK, LENIENT, MINIMAL_DAYS_IN_FIRST_WEEK, or TIME_IN_MILLIS
   * @param value
   *    The value associated with the change.
   */
  public void changed(MonitoredGregorianCalendar c, int type, int field, long value);
}

   
    
    
    
    
  

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