RepeaterYear.java

package er.chronic.repeaters;

import java.util.Calendar;

import er.chronic.tags.Pointer;
import er.chronic.tags.Pointer.PointerType;
import er.chronic.utils.Span;
import er.chronic.utils.Time;

public class RepeaterYear extends RepeaterUnit {
  public static final int YEAR_SECONDS = 31536000; // 365 * 24 * 60 * 60
  
  private Calendar _currentYearStart;

  @Override
  protected Span _nextSpan(PointerType pointer) {
    if (_currentYearStart == null) {
      if (pointer == PointerType.FUTURE) {
        _currentYearStart = Time.cloneAndAdd(Time.y(getNow()), Calendar.YEAR, 1);
      }
      else if (pointer == PointerType.PAST) {
        _currentYearStart = Time.cloneAndAdd(Time.y(getNow()), Calendar.YEAR, -1);
      }
      else {
        throw new IllegalArgumentException("Unable to handle pointer " + pointer + ".");
      }
    }
    else {
      int direction = (pointer == Pointer.PointerType.FUTURE) ? 1 : -1;
      _currentYearStart.add(Calendar.YEAR, direction);
    }

    return new Span(_currentYearStart, Calendar.YEAR, 1);
  }

  @Override
  protected Span _thisSpan(PointerType pointer) {
    Calendar yearStart;
    Calendar yearEnd;
    if (pointer == PointerType.FUTURE) {
      yearStart = Time.cloneAndAdd(Time.ymd(getNow()), Calendar.DAY_OF_MONTH, 1);
      yearEnd = Time.cloneAndAdd(Time.yJan1(getNow()), Calendar.YEAR, 1);
    }
    else if (pointer == PointerType.PAST) {
      yearStart = Time.yJan1(getNow());
      yearEnd = Time.ymd(getNow());
    }
    else if (pointer == PointerType.NONE) {
      yearStart = Time.yJan1(getNow());
      yearEnd = Time.cloneAndAdd(Time.yJan1(getNow()), Calendar.YEAR, 1);
    }
    else {
      throw new IllegalArgumentException("Unable to handle pointer " + pointer + ".");
    }
    return new Span(yearStart, yearEnd);
  }

  @Override
  public Span getOffset(Span span, float amount, Pointer.PointerType pointer) {
    int direction = (pointer == Pointer.PointerType.FUTURE) ? 1 : -1;
    Calendar newBegin = Time.cloneAndAdd(span.getBeginCalendar(), Calendar.YEAR, amount * direction);
    Calendar newEnd = Time.cloneAndAdd(span.getEndCalendar(), Calendar.YEAR, amount * direction);
    return new Span(newBegin, newEnd);
  }

  @Override
  public int getWidth() {
    // WARN: Does not use Calendar
    return (365 * 24 * 60 * 60);
  }

  @Override
  public String toString() {
    return super.toString() + "-year";
  }
}