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javax.swing
Class SpinnerDateModel

java.lang.Object
  |
  +--javax.swing.AbstractSpinnerModel
        |
        +--javax.swing.SpinnerDateModel
All Implemented Interfaces:
Serializable, SpinnerModel
public class SpinnerDateModel
extends AbstractSpinnerModel
implements Serializable

Safe: A SpinnerModel for sequences of Dates. The upper and lower bounds of the sequence are defined by properties called start and end and the size of the increase or decrease computed by the nextValue and previousValue methods is defined by a property called calendarField. The start and end properties can be null to indicate that the sequence has no lower or upper limit.

The value of the calendarField property must be one of the java.util.Calendar constants that specify a field within a Calendar. The getNextValue and getPreviousValue methods change the date forward or backwards by this amount. For example, if calendarField is Calendar.DAY_OF_WEEK, then nextValue produces a Date that's 24 hours after the current value, and previousValue produces a Date that's 24 hours earlier.

The legal values for calendarField are:

This model inherits a ChangeListener. The ChangeListeners are notified whenever the models value, calendarField, start, or end properties changes.

Since:
1.4
Version:
1.5 12/03/01
Author:
Hans Muller
See Also:
JSpinner, SpinnerModel, AbstractSpinnerModel, SpinnerListModel, SpinnerNumberModel, Calendar.add(int, int), Serialized Form

Field Summary
private  int calendarField
           
private  Comparable end
           
private  Comparable start
           
private  Calendar value
           
 
Fields inherited from class javax.swing.AbstractSpinnerModel
listenerList
 
Constructor Summary
SpinnerDateModel()
          Enabled: 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.
SpinnerDateModel(Date value, Comparable start, Comparable end, int calendarField)
          Enabled: Creates a SpinnerDateModel that represents a sequence of dates between start and end.
 
Method Summary
private  boolean calendarFieldOK(int calendarField)
           
 int getCalendarField()
          Enabled: Returns the Calendar field that is added to or subtracted from by the nextValue and previousValue methods.
 Date getDate()
          Enabled: Returns the current element in this sequence of Dates.
 Comparable getEnd()
          Enabled: Returns the last Date in the sequence.
 Object getNextValue()
          Enabled: Returns the next Date in the sequence, or null if the next date is after end.
 Object getPreviousValue()
          Enabled: Returns the previous Date in the sequence, or null if the previous date is before start.
 Comparable getStart()
          Enabled: Returns the first Date in the sequence.
 Object getValue()
          Enabled: Returns the current element in this sequence of Dates.
 void setCalendarField(int calendarField)
          Enabled: Changes the size of the date value change computed by the nextValue and previousValue methods.
 void setEnd(Comparable end)
          Enabled: Changes the upper limit for Dates in this sequence.
 void setStart(Comparable start)
          Enabled: Changes the lower limit for Dates in this sequence.
 void setValue(Object value)
          Enabled: Sets the current Date for this sequence.
 
Methods inherited from class javax.swing.AbstractSpinnerModel
addChangeListener, fireStateChanged, getChangeListeners, getListeners, removeChangeListener
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

start

private Comparable start

end

private Comparable end

value

private Calendar value

calendarField

private int calendarField
Constructor Detail

SpinnerDateModel

public SpinnerDateModel(Date value,
                        Comparable start,
                        Comparable end,
                        int calendarField)
Enabled: 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.

Parameters:
value - the current (non null) value of the model
start - the first date in the sequence or null
end - the last date in the sequence or null
calendarField - one of
Throws:
IllegalArgumentException - if value or calendarField are null, if calendarField isn't valid, or if the following expression is false: (start <= value <= end).
See Also:
Calendar.add(int, int), setValue(java.lang.Object), setStart(java.lang.Comparable), setEnd(java.lang.Comparable), setCalendarField(int)

SpinnerDateModel

public SpinnerDateModel()
Enabled: 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.

Method Detail

calendarFieldOK

private boolean calendarFieldOK(int calendarField)

setStart

public void setStart(Comparable start)
Enabled: 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.

Parameters:
start - defines the first date in the sequence
See Also:
getStart(), setEnd(java.lang.Comparable), AbstractSpinnerModel.addChangeListener(javax.swing.event.ChangeListener)

getStart

public Comparable getStart()
Enabled: Returns the first Date in the sequence.

Returns:
the value of the start property
See Also:
setStart(java.lang.Comparable)

setEnd

public void setEnd(Comparable end)
Enabled: 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.

See Also:
getEnd(), setStart(java.lang.Comparable), AbstractSpinnerModel.addChangeListener(javax.swing.event.ChangeListener)

getEnd

public Comparable getEnd()
Enabled: Returns the last Date in the sequence.

Returns:
the value of the end property
See Also:
setEnd(java.lang.Comparable)

setCalendarField

public void setCalendarField(int calendarField)
Enabled: 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.

See Also:
getCalendarField(), getNextValue(), getPreviousValue(), Calendar.add(int, int), AbstractSpinnerModel.addChangeListener(javax.swing.event.ChangeListener)

getCalendarField

public int getCalendarField()
Enabled: Returns the Calendar field that is added to or subtracted from by the nextValue and previousValue methods.

Returns:
the value of the calendarField property
See Also:
setCalendarField(int)

getNextValue

public Object getNextValue()
Enabled: Returns the next Date in the sequence, or null if the next date is after end.

Specified by:
getNextValue in interface SpinnerModel
Returns:
the next Date in the sequence, or null if the next date is after end.
See Also:
SpinnerModel.getNextValue(), getPreviousValue(), setCalendarField(int)

getPreviousValue

public Object getPreviousValue()
Enabled: Returns the previous Date in the sequence, or null if the previous date is before start.

Specified by:
getPreviousValue in interface SpinnerModel
Returns:
the previous Date in the sequence, or null if the previous date is before start
See Also:
SpinnerModel.getPreviousValue(), getNextValue(), setCalendarField(int)

getDate

public Date getDate()
Enabled: Returns the current element in this sequence of Dates. This method is equivalent to (Date)getValue.

Returns:
the value property
See Also:
setValue(java.lang.Object)

getValue

public Object getValue()
Enabled: Returns the current element in this sequence of Dates.

Specified by:
getValue in interface SpinnerModel
Returns:
the value property
See Also:
setValue(java.lang.Object), getDate()

setValue

public void setValue(Object value)
Enabled: 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.

Specified by:
setValue in interface SpinnerModel
Parameters:
value - the current (non null) Date for this sequence
Throws:
IllegalArgumentException - if value is null or not a Date
See Also:
getDate(), getValue(), AbstractSpinnerModel.addChangeListener(javax.swing.event.ChangeListener)
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