File	Doc	Category	Size	Date	Package
SpinnerDateModel.java	API Doc	Java SE 5 API	16091	Fri Aug 26 14:57:58 BST 2005	javax.swing

SpinnerDateModel

• java.lang.Object
  • javax.swing.AbstractSpinnerModel

Fields Summary
private Comparable	start
private Comparable	end
private Calendar	value
private int	calendarField

Constructors Summary
public SpinnerDateModel(Date value, Comparable start, Comparable end, int calendarField) Creates a SpinnerDateModel that represents a sequence of dates between start and end. The nextValue and previousValue methods compute elements of the sequence by advancing or reversing the current date value by the calendarField time unit. For a precise description of what it means to increment or decrement a Calendar field, see the add method in java.util.Calendar. The start and end parameters can be null to indicate that the range doesn't have an upper or lower bound. If value or calendarField is null, or if both start and end are specified and mininum > maximum then an IllegalArgumentException is thrown. Similarly if (minimum <= value <= maximum) is false, an IllegalArgumentException is thrown. param value the current (non null) value of the model param start the first date in the sequence or null param end the last date in the sequence or null param calendarField one of Calendar.ERA Calendar.YEAR Calendar.MONTH Calendar.WEEK_OF_YEAR Calendar.WEEK_OF_MONTH Calendar.DAY_OF_MONTH Calendar.DAY_OF_YEAR Calendar.DAY_OF_WEEK Calendar.DAY_OF_WEEK_IN_MONTH Calendar.AM_PM Calendar.HOUR Calendar.HOUR_OF_DAY Calendar.MINUTE Calendar.SECOND Calendar.MILLISECOND throws IllegalArgumentException if value or calendarField are null, if calendarField isn't valid, or if the following expression is false: (start <= value <= end). see Calendar#add see #setValue see #setStart see #setEnd see #setCalendarField if (value == null) { throw new IllegalArgumentException("value is null"); } if (!calendarFieldOK(calendarField)) { throw new IllegalArgumentException("invalid calendarField"); } if (!(((start == null) || (start.compareTo(value) <= 0)) && ((end == null) || (end.compareTo(value) >= 0)))) { throw new IllegalArgumentException("(start <= value <= end) is false"); } this.value = Calendar.getInstance(); this.start = start; this.end = end; this.calendarField = calendarField; this.value.setTime(value);
public SpinnerDateModel() Constructs a SpinnerDateModel whose initial value is the current date, calendarField is equal to Calendar.DAY_OF_MONTH, and for which there are no start/end limits. this(new Date(), null, null, Calendar.DAY_OF_MONTH);

Methods Summary
private boolean	calendarFieldOK(int calendarField) switch(calendarField) { case Calendar.ERA: case Calendar.YEAR: case Calendar.MONTH: case Calendar.WEEK_OF_YEAR: case Calendar.WEEK_OF_MONTH: case Calendar.DAY_OF_MONTH: case Calendar.DAY_OF_YEAR: case Calendar.DAY_OF_WEEK: case Calendar.DAY_OF_WEEK_IN_MONTH: case Calendar.AM_PM: case Calendar.HOUR: case Calendar.HOUR_OF_DAY: case Calendar.MINUTE: case Calendar.SECOND: case Calendar.MILLISECOND: return true; default: return false; }
public int	getCalendarField() Returns the Calendar field that is added to or subtracted from by the nextValue and previousValue methods. return the value of the calendarField property see #setCalendarField return calendarField;
public java.util.Date	getDate() Returns the current element in this sequence of Dates. This method is equivalent to (Date)getValue. return the value property see #setValue return value.getTime();
public java.lang.Comparable	getEnd() Returns the last Date in the sequence. return the value of the end property see #setEnd return end;
public java.lang.Object	getNextValue() Returns the next Date in the sequence, or null if the next date is after end. return the next Date in the sequence, or null if the next date is after end. see SpinnerModel#getNextValue see #getPreviousValue see #setCalendarField Calendar cal = Calendar.getInstance(); cal.setTime(value.getTime()); cal.add(calendarField, 1); Date next = cal.getTime(); return ((end == null) || (end.compareTo(next) >= 0)) ? next : null;
public java.lang.Object	getPreviousValue() Returns the previous Date in the sequence, or null if the previous date is before start. return the previous Date in the sequence, or null if the previous date is before start see SpinnerModel#getPreviousValue see #getNextValue see #setCalendarField Calendar cal = Calendar.getInstance(); cal.setTime(value.getTime()); cal.add(calendarField, -1); Date prev = cal.getTime(); return ((start == null) || (start.compareTo(prev) <= 0)) ? prev : null;
public java.lang.Comparable	getStart() Returns the first Date in the sequence. return the value of the start property see #setStart return start;
public java.lang.Object	getValue() Returns the current element in this sequence of Dates. return the value property see #setValue see #getDate return value.getTime();
public void	setCalendarField(int calendarField) Changes the size of the date value change computed by the nextValue and previousValue methods. The calendarField parameter must be one of the Calendar field constants like Calendar.MONTH or Calendar.MINUTE. The nextValue and previousValue methods simply move the specified Calendar field forward or backward by one unit with the Calendar.add method. You should use this method with care as some UIs may set the calendarField before commiting the edit to spin the field under the cursor. If you only want one field to spin you can subclass and ignore the setCalendarField calls. param calendarField one of Calendar.ERA Calendar.YEAR Calendar.MONTH Calendar.WEEK_OF_YEAR Calendar.WEEK_OF_MONTH Calendar.DAY_OF_MONTH Calendar.DAY_OF_YEAR Calendar.DAY_OF_WEEK Calendar.DAY_OF_WEEK_IN_MONTH Calendar.AM_PM Calendar.HOUR Calendar.HOUR_OF_DAY Calendar.MINUTE Calendar.SECOND Calendar.MILLISECOND This method fires a ChangeEvent if the calendarField has changed. see #getCalendarField see #getNextValue see #getPreviousValue see Calendar#add see #addChangeListener if (!calendarFieldOK(calendarField)) { throw new IllegalArgumentException("invalid calendarField"); } if (calendarField != this.calendarField) { this.calendarField = calendarField; fireStateChanged(); }
public void	setEnd(java.lang.Comparable end) Changes the upper limit for Dates in this sequence. If start is null, then there is no upper limit. No bounds checking is done here: the new start value may invalidate the (start <= value <= end) invariant enforced by the constructors. This is to simplify updating the model. Naturally, one should ensure that the invariant is true before calling the nextValue, previousValue, or setValue methods. Typically this property is a Date however it's possible to use Comparable with a compareTo method for Dates. See setStart for an example. This method fires a ChangeEvent if the end has changed. param end defines the last date in the sequence see #getEnd see #setStart see #addChangeListener if ((end == null) ? (this.end != null) : !end.equals(this.end)) { this.end = end; fireStateChanged(); }
public void	setStart(java.lang.Comparable start) Changes the lower limit for Dates in this sequence. If start is null, then there is no lower limit. No bounds checking is done here: the new start value may invalidate the (start <= value <= end) invariant enforced by the constructors. This is to simplify updating the model. Naturally one should ensure that the invariant is true before calling the nextValue, previousValue, or setValue methods. Typically this property is a Date however it's possible to use a Comparable with a compareTo method for Dates. For example start might be an instance of a class like this: MyStartDate implements Comparable { long t = 12345; public int compareTo(Date d) { return (t < d.getTime() ? -1 : (t == d.getTime() ? 0 : 1)); } public int compareTo(Object o) { return compareTo((Date)o); } } Note that the above example will throw a ClassCastException if the Object passed to compareTo(Object) is not a Date. This method fires a ChangeEvent if the start has changed. param start defines the first date in the sequence see #getStart see #setEnd see #addChangeListener if ((start == null) ? (this.start != null) : !start.equals(this.start)) { this.start = start; fireStateChanged(); }
public void	setValue(java.lang.Object value) Sets the current Date for this sequence. If value is null, an IllegalArgumentException is thrown. No bounds checking is done here: the new value may invalidate the (start <= value < end) invariant enforced by the constructors. Naturally, one should ensure that the (start <= value <= maximum) invariant is true before calling the nextValue, previousValue, or setValue methods. This method fires a ChangeEvent if the value has changed. param value the current (non null) Date for this sequence throws IllegalArgumentException if value is null or not a Date see #getDate see #getValue see #addChangeListener if ((value == null) || !(value instanceof Date)) { throw new IllegalArgumentException("null value"); } if (!value.equals(this.value.getTime())) { this.value.setTime((Date)value); fireStateChanged(); }