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package javax.swing;
import java.util.*;
import java.io.Serializable;
/**
* A <code>SpinnerModel</code> for sequences of <code>Date</code>s.
* The upper and lower bounds of the sequence are defined by properties called
* <code>start</code> and <code>end</code> and the size
* of the increase or decrease computed by the <code>nextValue</code>
* and <code>previousValue</code> methods is defined by a property
* called <code>calendarField</code>. The <code>start</code>
* and <code>end</code> properties can be <code>null</code> to
* indicate that the sequence has no lower or upper limit.
* <p>
* The value of the <code>calendarField</code> property must be one of the
* <code>java.util.Calendar</code> constants that specify a field
* within a <code>Calendar</code>. The <code>getNextValue</code>
* and <code>getPreviousValue</code>
* methods change the date forward or backwards by this amount.
* For example, if <code>calendarField</code> is <code>Calendar.DAY_OF_WEEK</code>,
* then <code>nextValue</code> produces a <code>Date</code> that's 24
* hours after the current <code>value</code>, and <code>previousValue</code>
* produces a <code>Date</code> that's 24 hours earlier.
* <p>
* The legal values for <code>calendarField</code> are:
* <ul>
* <li><code>Calendar.ERA</code>
* <li><code>Calendar.YEAR</code>
* <li><code>Calendar.MONTH</code>
* <li><code>Calendar.WEEK_OF_YEAR</code>
* <li><code>Calendar.WEEK_OF_MONTH</code>
* <li><code>Calendar.DAY_OF_MONTH</code>
* <li><code>Calendar.DAY_OF_YEAR</code>
* <li><code>Calendar.DAY_OF_WEEK</code>
* <li><code>Calendar.DAY_OF_WEEK_IN_MONTH</code>
* <li><code>Calendar.AM_PM</code>
* <li><code>Calendar.HOUR</code>
* <li><code>Calendar.HOUR_OF_DAY</code>
* <li><code>Calendar.MINUTE</code>
* <li><code>Calendar.SECOND</code>
* <li><code>Calendar.MILLISECOND</code>
* </ul>
* However some UIs may set the calendarField before committing 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.
* <p>
* This model inherits a <code>ChangeListener</code>. The
* <code>ChangeListeners</code> are notified whenever the models
* <code>value</code>, <code>calendarField</code>,
* <code>start</code>, or <code>end</code> properties changes.
*
* @see JSpinner
* @see SpinnerModel
* @see AbstractSpinnerModel
* @see SpinnerListModel
* @see SpinnerNumberModel
* @see Calendar#add
*
* @author Hans Muller
* @since 1.4
*/
public class SpinnerDateModel extends AbstractSpinnerModel implements Serializable
{
private Comparable start, end;
private Calendar value;
private int calendarField;
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;
}
}
/**
* Creates a <code>SpinnerDateModel</code> that represents a sequence of dates
* between <code>start</code> and <code>end</code>. The
* <code>nextValue</code> and <code>previousValue</code> methods
* compute elements of the sequence by advancing or reversing
* the current date <code>value</code> by the
* <code>calendarField</code> time unit. For a precise description
* of what it means to increment or decrement a <code>Calendar</code>
* <code>field</code>, see the <code>add</code> method in
* <code>java.util.Calendar</code>.
* <p>
* The <code>start</code> and <code>end</code> parameters can be
* <code>null</code> to indicate that the range doesn't have an
* upper or lower bound. If <code>value</code> or
* <code>calendarField</code> is <code>null</code>, or if both
* <code>start</code> and <code>end</code> are specified and
* <code>minimum > maximum</code> then an
* <code>IllegalArgumentException</code> is thrown.
* Similarly if <code>(minimum <= value <= maximum)</code> is false,
* an IllegalArgumentException is thrown.
*
* @param value the current (non <code>null</code>) value of the model
* @param start the first date in the sequence or <code>null</code>
* @param end the last date in the sequence or <code>null</code>
* @param calendarField one of
* <ul>
* <li><code>Calendar.ERA</code>
* <li><code>Calendar.YEAR</code>
* <li><code>Calendar.MONTH</code>
* <li><code>Calendar.WEEK_OF_YEAR</code>
* <li><code>Calendar.WEEK_OF_MONTH</code>
* <li><code>Calendar.DAY_OF_MONTH</code>
* <li><code>Calendar.DAY_OF_YEAR</code>
* <li><code>Calendar.DAY_OF_WEEK</code>
* <li><code>Calendar.DAY_OF_WEEK_IN_MONTH</code>
* <li><code>Calendar.AM_PM</code>
* <li><code>Calendar.HOUR</code>
* <li><code>Calendar.HOUR_OF_DAY</code>
* <li><code>Calendar.MINUTE</code>
* <li><code>Calendar.SECOND</code>
* <li><code>Calendar.MILLISECOND</code>
* </ul>
*
* @throws IllegalArgumentException if <code>value</code> or
* <code>calendarField</code> are <code>null</code>,
* if <code>calendarField</code> isn't valid,
* or if the following expression is
* false: <code>(start <= value <= end)</code>.
*
* @see Calendar#add
* @see #setValue
* @see #setStart
* @see #setEnd
* @see #setCalendarField
*/
public SpinnerDateModel(Date value, Comparable start, Comparable end, int calendarField) {
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);
}
/**
* Constructs a <code>SpinnerDateModel</code> whose initial
* <code>value</code> is the current date, <code>calendarField</code>
* is equal to <code>Calendar.DAY_OF_MONTH</code>, and for which
* there are no <code>start</code>/<code>end</code> limits.
*/
public SpinnerDateModel() {
this(new Date(), null, null, Calendar.DAY_OF_MONTH);
}
/**
* Changes the lower limit for Dates in this sequence.
* If <code>start</code> is <code>null</code>,
* then there is no lower limit. No bounds checking is done here:
* the new start value may invalidate the
* <code>(start <= value <= end)</code>
* invariant enforced by the constructors. This is to simplify updating
* the model. Naturally one should ensure that the invariant is true
* before calling the <code>nextValue</code>, <code>previousValue</code>,
* or <code>setValue</code> methods.
* <p>
* Typically this property is a <code>Date</code> however it's possible to use
* a <code>Comparable</code> with a <code>compareTo</code> method for Dates.
* For example <code>start</code> might be an instance of a class like this:
* <pre>
* 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);
* }
* }
* </pre>
* Note that the above example will throw a <code>ClassCastException</code>
* if the <code>Object</code> passed to <code>compareTo(Object)</code>
* is not a <code>Date</code>.
* <p>
* This method fires a <code>ChangeEvent</code> if the
* <code>start</code> has changed.
*
* @param start defines the first date in the sequence
* @see #getStart
* @see #setEnd
* @see #addChangeListener
*/
public void setStart(Comparable start) {
if ((start == null) ? (this.start != null) : !start.equals(this.start)) {
this.start = start;
fireStateChanged();
}
}
/**
* Returns the first <code>Date</code> in the sequence.
*
* @return the value of the <code>start</code> property
* @see #setStart
*/
public Comparable getStart() {
return start;
}
/**
* Changes the upper limit for <code>Date</code>s in this sequence.
* If <code>start</code> is <code>null</code>, then there is no upper
* limit. No bounds checking is done here: the new
* start value may invalidate the <code>(start <= value <= end)</code>
* invariant enforced by the constructors. This is to simplify updating
* the model. Naturally, one should ensure that the invariant is true
* before calling the <code>nextValue</code>, <code>previousValue</code>,
* or <code>setValue</code> methods.
* <p>
* Typically this property is a <code>Date</code> however it's possible to use
* <code>Comparable</code> with a <code>compareTo</code> method for
* <code>Date</code>s. See <code>setStart</code> for an example.
* <p>
* This method fires a <code>ChangeEvent</code> if the <code>end</code>
* has changed.
*
* @param end defines the last date in the sequence
* @see #getEnd
* @see #setStart
* @see #addChangeListener
*/
public void setEnd(Comparable end) {
if ((end == null) ? (this.end != null) : !end.equals(this.end)) {
this.end = end;
fireStateChanged();
}
}
/**
* Returns the last <code>Date</code> in the sequence.
*
* @return the value of the <code>end</code> property
* @see #setEnd
*/
public Comparable getEnd() {
return end;
}
/**
* Changes the size of the date value change computed
* by the <code>nextValue</code> and <code>previousValue</code> methods.
* The <code>calendarField</code> parameter must be one of the
* <code>Calendar</code> field constants like <code>Calendar.MONTH</code>
* or <code>Calendar.MINUTE</code>.
* The <code>nextValue</code> and <code>previousValue</code> methods
* simply move the specified <code>Calendar</code> field forward or backward
* by one unit with the <code>Calendar.add</code> method.
* You should use this method with care as some UIs may set the
* calendarField before committing 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
* <ul>
* <li><code>Calendar.ERA</code>
* <li><code>Calendar.YEAR</code>
* <li><code>Calendar.MONTH</code>
* <li><code>Calendar.WEEK_OF_YEAR</code>
* <li><code>Calendar.WEEK_OF_MONTH</code>
* <li><code>Calendar.DAY_OF_MONTH</code>
* <li><code>Calendar.DAY_OF_YEAR</code>
* <li><code>Calendar.DAY_OF_WEEK</code>
* <li><code>Calendar.DAY_OF_WEEK_IN_MONTH</code>
* <li><code>Calendar.AM_PM</code>
* <li><code>Calendar.HOUR</code>
* <li><code>Calendar.HOUR_OF_DAY</code>
* <li><code>Calendar.MINUTE</code>
* <li><code>Calendar.SECOND</code>
* <li><code>Calendar.MILLISECOND</code>
* </ul>
* <p>
* This method fires a <code>ChangeEvent</code> if the
* <code>calendarField</code> has changed.
*
* @see #getCalendarField
* @see #getNextValue
* @see #getPreviousValue
* @see Calendar#add
* @see #addChangeListener
*/
public void setCalendarField(int calendarField) {
if (!calendarFieldOK(calendarField)) {
throw new IllegalArgumentException("invalid calendarField");
}
if (calendarField != this.calendarField) {
this.calendarField = calendarField;
fireStateChanged();
}
}
/**
* Returns the <code>Calendar</code> field that is added to or subtracted from
* by the <code>nextValue</code> and <code>previousValue</code> methods.
*
* @return the value of the <code>calendarField</code> property
* @see #setCalendarField
*/
public int getCalendarField() {
return calendarField;
}
/**
* Returns the next <code>Date</code> in the sequence, or <code>null</code> if
* the next date is after <code>end</code>.
*
* @return the next <code>Date</code> in the sequence, or <code>null</code> if
* the next date is after <code>end</code>.
*
* @see SpinnerModel#getNextValue
* @see #getPreviousValue
* @see #setCalendarField
*/
public Object getNextValue() {
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;
}
/**
* Returns the previous <code>Date</code> in the sequence, or <code>null</code>
* if the previous date is before <code>start</code>.
*
* @return the previous <code>Date</code> in the sequence, or
* <code>null</code> if the previous date
* is before <code>start</code>
*
* @see SpinnerModel#getPreviousValue
* @see #getNextValue
* @see #setCalendarField
*/
public Object getPreviousValue() {
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;
}
/**
* Returns the current element in this sequence of <code>Date</code>s.
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