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+/* SpinnerDateModel.java --
+ Copyright (C) 2002, 2004 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING. If not, write to the
+Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+02111-1307 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library. Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module. An independent module is a module which is not derived from
+or based on this library. If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so. If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package javax.swing;
+
+import java.io.Serializable;
+import java.util.Calendar;
+import java.util.Date;
+
+/**
+ * SpinnerDateModel
+ *
+ * Implements a SpinnerModel for dates, rotating a calendar field such as
+ * month, year, day, week, hour, minute.
+ *
+ * @author Sven de Marothy
+ * @version 0.1 (first implementation)
+ */
+public class SpinnerDateModel extends AbstractSpinnerModel
+ implements Serializable
+{
+ private Calendar date;
+ private Comparable start;
+ private Comparable end;
+ private int calendarField;
+
+ /**
+ * For compatability with Sun's JDK
+ * FIXME: what's the number? And which fields should be serialized?
+ */
+ private static final long serialVersionUID = 1L;
+
+ /**
+ * Constructs a SpinnerDateModel using the current date,
+ * no start or end limit, and Calendar.DAY_OF_MONTH as the calendar field.
+ */
+ public SpinnerDateModel()
+ {
+ this(new Date(), null, null, Calendar.DAY_OF_MONTH);
+ }
+
+ /**
+ * Constructs a SpinnerDateModel which spins a given calendar field,
+ * using a given date and start and end date limits.
+ * @param value - the initial Date value
+ * @param start - start limit, as a Date object, or <code>null</code>
+ * for no lower limit.
+ * @param end - end limit, or <code>null</code> for no upper limit.
+ * @param calendarField - the <code>Calendar</code> field to spin,
+ * (Calendar.ZONE_OFFSET and Calendar.DST_OFFSET are invalid)
+ */
+ public SpinnerDateModel(Date value, Comparable start, Comparable end,
+ int calendarField)
+ {
+ date = Calendar.getInstance();
+ date.setTime(value);
+ this.start = start;
+ this.end = end;
+ setCalendarField(calendarField);
+ }
+
+ /**
+ * Returns the value of the Calendar field to spin.
+ */
+ public int getCalendarField()
+ {
+ return calendarField;
+ }
+
+ /**
+ * Returns the current date in the sequence.
+ * @return a <code>Date</code> object.
+ */
+ public Date getDate()
+ {
+ return date.getTime();
+ }
+
+ /**
+ * Returns the starting limit of the SpinnerModel.
+ * @return a Date object, or <code>null</code> if there is no limit.
+ */
+ public Comparable getStart()
+ {
+ return start;
+ }
+
+ /**
+ * Returns the end limit of the SpinnerModel.
+ * @return a Date object, or <code>null</code> if there is no limit.
+ */
+ public Comparable getEnd()
+ {
+ return end;
+ }
+
+ /**
+ * Returns the current date in the sequence,
+ * this method returns the same as <code>getDate()</code>.
+ * @return a <code>Date</code> object.
+ */
+ public Object getValue()
+ {
+ return date.getTime();
+ }
+
+ /**
+ * Returns the next date in the sequence, or <code>null</code> if the
+ * next date is equal to or past the end limit.
+ * @return a Date object, or <code>null</code>.
+ */
+ public Object getNextValue()
+ {
+ Calendar nextCal = Calendar.getInstance();
+ nextCal.setTime(date.getTime());
+ nextCal.roll(calendarField, true);
+ Date nextDate = nextCal.getTime();
+ if (end != null)
+ if (end.compareTo(nextDate) < 0)
+ return null;
+ return nextDate;
+ }
+
+ /**
+ * Returns the previous date in the sequence, or <code>null</code> if the
+ * next date is equal to or past the end limit.
+ * @return a Date object, or <code>null</code>.
+ */
+ public Object getPreviousValue()
+ {
+ Calendar prevCal = Calendar.getInstance();
+ prevCal.setTime(date.getTime());
+ prevCal.roll(calendarField, false);
+ Date prevDate = prevCal.getTime();
+ if (end != null)
+ if (end.compareTo(prevDate) > 0)
+ return null;
+ return prevDate;
+ }
+
+ /**
+ * Sets the date field to change. It must be a valid Calendar field,
+ * excluding Calendar.ZONE_OFFSET and Calendar.DST_OFFSET.
+ * @param calendarField - the calendar field to set.
+ */
+ public void setCalendarField(int calendarField)
+ {
+ if (calendarField < 0 || calendarField >= Calendar.FIELD_COUNT
+ || calendarField == Calendar.ZONE_OFFSET
+ || calendarField == Calendar.DST_OFFSET)
+ throw new IllegalArgumentException("Illegal calendarField");
+
+ if (this.calendarField != calendarField)
+ {
+ this.calendarField = calendarField;
+ fireStateChanged();
+ }
+ }
+
+ /**
+ * Sets the starting date limit for the sequence.
+ *
+ * @param start - a Date object of the limit date,
+ * or <code>null</code> for no limit.
+ */
+ public void setStart(Comparable start)
+ {
+ if (this.start != start)
+ {
+ this.start = start;
+ fireStateChanged();
+ }
+ }
+
+ /**
+ * Sets the end date limit for the sequence.
+ *
+ * @param end - a Date object of the limit date,
+ * or <code>null</code> for no limit.
+ */
+ public void setEnd(Comparable end)
+ {
+ if (this.end != end)
+ {
+ this.end = end;
+ fireStateChanged();
+ }
+ }
+
+ /**
+ * Sets the current date in the sequence.
+ *
+ * @param value - a Date object.
+ */
+ public void setValue(Object value)
+ {
+ if (! (value instanceof Date) || value == null)
+ throw new IllegalArgumentException("Value not a date.");
+ date.setTime((Date) value);
+ fireStateChanged();
+ }
+}