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Laurent Quenon
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Posts: 11
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Hi all,

I have a stupid problem with my TableModel, I'm sure it's stupid but it becomes really annoying because I don't see what is the problem .

I'm trying to create a kind of DatePicker for this I'm using a combo box where you can select the month (year is always 2005, it's just a draft version) The days of the selected month are then displayed in a tanle using a table model.

Here is the form class

/*
* frmCalendar.java
*
* Created on 15 f�vrier 2005, 22:00
*/

package com.shsolutions.utils;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.text.*;
import java.util.GregorianCalendar;
import java.util.Date;
import java.util.Arrays;

/**
*
* @author Laurent
*/
public class frmCalendar extends JFrame {
private JComboBox months;
private JLabel etiquette;
private JTable monthDays;
private JScrollPane jsp;
private String strMonth[];
private String strDays[];
private GregorianCalendar calendar = new GregorianCalendar();
private Object [][] objWeeks;
private Container conteneur;
private CalendarModel calContent;

/** Creates a new instance of frmCalendar */
public frmCalendar() {
super ("Test de calendrier");
conteneur = getContentPane();
conteneur.setLayout(new FlowLayout());
strMonth = new DateFormatSymbols().getMonths();
strDays = new DateFormatSymbols().getShortWeekdays();
calContent = new CalendarModel(calendar.MONTH,calendar.YEAR);
months = new JComboBox(strMonth);
months.setMaximumRowCount(6);

months.addItemListener(new ItemListener(){
public void itemStateChanged(ItemEvent evenement){
if (evenement.getStateChange()== ItemEvent.SELECTED)
{

calContent.setMonthCalendar(months.getSelectedIndex(),2005);
}
}
});
conteneur.add(months);


monthDays = new JTable(calContent);
JScrollPane jsp = new JScrollPane(monthDays);
conteneur.add(jsp);

setSize(350, 140);
setVisible(true);

}

public static void main(String args[]){
frmCalendar application = new frmCalendar();
application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}

Now the AbstractTableModel class

/*
* @(#)AbstractTableModel.java1.39 03/01/23
*
* Copyright 2003 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/

package javax.swing.table;

import javax.swing.*;
import javax.swing.event.*;
import java.io.Serializable;
import java.util.EventListener;

/**
* This abstract class provides default implementations for most of
* the methods in the <code>TableModel</code> interface. It takes care of
* the management of listeners and provides some conveniences for generating
* <code>TableModelEvents</code> and dispatching them to the listeners.
* To create a concrete <code>TableModel</code> as a subclass of
* <code>AbstractTableModel</code> you need only provide implementations
* for the following three methods:
*
* <pre>
* public int getRowCount();
* public int getColumnCount();
* public Object getValueAt(int row, int column);
* </pre>
* <p>
* <strong>Warning:</strong>
* Serialized objects of this class will not be compatible with
* future Swing releases. The current serialization support is
* appropriate for short term storage or RMI between applications running
* the same version of Swing. As of 1.4, support for long term storage
* of all JavaBeans<sup><font size="-2">TM</font></sup>
* has been added to the <code>java.beans</code> package.
* Please see {@link java.beans.XMLEncoder}.
*
* @version 1.39 01/23/03
* @author Alan Chung
* @author Philip Milne
*/
public abstract class AbstractTableModel implements TableModel, Serializable
{
//
// Instance Variables
//

/** List of listeners */
protected EventListenerList listenerList = new EventListenerList();

//
// Default Implementation of the Interface
//

/**
* Returns a default name for the column using spreadsheet conventions:
* A, B, C, ... Z, AA, AB, etc. If <code>column</code> cannot be found,
* returns an empty string.
*
* @param column the column being queried
* @return a string containing the default name of <code>column</code>
*/
public String getColumnName(int column) {
String result = "";
for (; column >= 0; column = column / 26 - 1) {
result = (char)((char)(column%26)+'A') + result;
}
return result;
}

/**
* Returns a column given its name.
* Implementation is naive so this should be overridden if
* this method is to be called often. This method is not
* in the <code>TableModel</code> interface and is not used by the
* <code>JTable</code>.
*
* @param columnName string containing name of column to be located
* @return the column with <code>columnName</code>, or -1 if not found
*/
public int findColumn(String columnName) {
for (int i = 0; i < getColumnCount(); i++) {
if (columnName.equals(getColumnName(i))) {
return i;
}
}
return -1;
}

/**
* Returns <code>Object.class</code> regardless of <code>columnIndex</code>.
*
* @param columnIndex the column being queried
* @return the Object.class
*/
public Class getColumnClass(int columnIndex) {
return Object.class;
}

/**
* Returns false. This is the default implementation for all cells.
*
* @param rowIndex the row being queried
* @param columnIndex the column being queried
* @return false
*/
public boolean isCellEditable(int rowIndex, int columnIndex) {
return false;
}

/**
* This empty implementation is provided so users don't have to implement
* this method if their data model is not editable.
*
* @param aValue value to assign to cell
* @param rowIndex row of cell
* @param columnIndex column of cell
*/
public void setValueAt(Object aValue, int rowIndex, int columnIndex) {
}


//
// Managing Listeners
//

/**
* Adds a listener to the list that's notified each time a change
* to the data model occurs.
*
* @paramlthe TableModelListener
*/
public void addTableModelListener(TableModelListener l) {
listenerList.add(TableModelListener.class, l);
}

/**
* Removes a listener from the list that's notified each time a
* change to the data model occurs.
*
* @paramlthe TableModelListener
*/
public void removeTableModelListener(TableModelListener l) {
listenerList.remove(TableModelListener.class, l);
}

/**
* Returns an array of all the table model listeners
* registered on this model.
*
* @return all of this model's <code>TableModelListener</code>s
* or an empty
* array if no table model listeners are currently registered
*
* @see #addTableModelListener
* @see #removeTableModelListener
*
* @since 1.4
*/
public TableModelListener[] getTableModelListeners() {
return (TableModelListener[])listenerList.getListeners(
TableModelListener.class);
}

//
// Fire methods
//

/**
* Notifies all listeners that all cell values in the table's
* rows may have changed. The number of rows may also have changed
* and the <code>JTable</code> should redraw the
* table from scratch. The structure of the table (as in the order of the
* columns) is assumed to be the same.
*
* @see TableModelEvent
* @see EventListenerList
* @see javax.swing.JTable#tableChanged(TableModelEvent)
*/
public void fireTableDataChanged() {
fireTableChanged(new TableModelEvent(this));
}

/**
* Notifies all listeners that the table's structure has changed.
* The number of columns in the table, and the names and types of
* the new columns may be different from the previous state.
* If the <code>JTable</code> receives this event and its
* <code>autoCreateColumnsFromModel</code>
* flag is set it discards any table columns that it had and reallocates
* default columns in the order they appear in the model. This is the
* same as calling <code>setModel(TableModel)</code> on the
* <code>JTable</code>.
*
* @see TableModelEvent
* @see EventListenerList
*/
public void fireTableStructureChanged() {
fireTableChanged(new TableModelEvent(this, TableModelEvent.HEADER_ROW));
}

/**
* Notifies all listeners that rows in the range
* <code>[firstRow, lastRow]</code>, inclusive, have been inserted.
*
* @param firstRow the first row
* @param lastRow the last row
*
* @see TableModelEvent
* @see EventListenerList
*
*/
public void fireTableRowsInserted(int firstRow, int lastRow) {
fireTableChanged(new TableModelEvent(this, firstRow, lastRow,
TableModelEvent.ALL_COLUMNS, TableModelEvent.INSERT));
}

/**
* Notifies all listeners that rows in the range
* <code>[firstRow, lastRow]</code>, inclusive, have been updated.
*
* @param firstRow the first row
* @param lastRow the last row
*
* @see TableModelEvent
* @see EventListenerList
*/
public void fireTableRowsUpdated(int firstRow, int lastRow) {
fireTableChanged(new TableModelEvent(this, firstRow, lastRow,
TableModelEvent.ALL_COLUMNS, TableModelEvent.UPDATE));
}

/**
* Notifies all listeners that rows in the range
* <code>[firstRow, lastRow]</code>, inclusive, have been deleted.
*
* @param firstRow the first row
* @param lastRow the last row
*
* @see TableModelEvent
* @see EventListenerList
*/
public void fireTableRowsDeleted(int firstRow, int lastRow) {
fireTableChanged(new TableModelEvent(this, firstRow, lastRow,
TableModelEvent.ALL_COLUMNS, TableModelEvent.DELETE));
}

/**
* Notifies all listeners that the value of the cell at
* <code>[row, column]</code> has been updated.
*
* @param row row of cell which has been updated
* @param column column of cell which has been updated
* @see TableModelEvent
* @see EventListenerList
*/
public void fireTableCellUpdated(int row, int column) {
fireTableChanged(new TableModelEvent(this, row, row, column));
}

/**
* Forwards the given notification event to all
* <code>TableModelListeners</code> that registered
* themselves as listeners for this table model.
*
* @param e the event to be forwarded
*
* @see #addTableModelListener
* @see TableModelEvent
* @see EventListenerList
*/
public void fireTableChanged(TableModelEvent e) {
// Guaranteed to return a non-null array
Object[] listeners = listenerList.getListenerList();
// Process the listeners last to first, notifying
// those that are interested in this event
for (int i = listeners.length-2; i>=0; i-=2) {
if (listeners[i]==TableModelListener.class) {
((TableModelListener)listeners[i+1]).tableChanged(e);
}
}
}

/**
* Returns an array of all the objects currently registered
* as <code><em>Foo</em>Listener</code>s
* upon this <code>AbstractTableModel</code>.
* <code><em>Foo</em>Listener</code>s are registered using the
* <code>add<em>Foo</em>Listener</code> method.
*
* <p>
*
* You can specify the <code>listenerType</code> argument
* with a class literal,
* such as
* <code><em>Foo</em>Listener.class</code>.
* For example, you can query a
* model <code>m</code>
* for its table model listeners with the following code:
*
* <pre>TableModelListener[] tmls = (TableModelListener[])(m.getListeners(TableModelListener.class));</pre>
*
* If no such listeners exist, this method returns an empty array.
*
* @param listenerType the type of listeners requested; this parameter
* should specify an interface that descends from
* <code>java.util.EventListener</code>
* @return an array of all objects registered as
* <code><em>Foo</em>Listener</code>s on this component,
* or an empty array if no such
* listeners have been added
* @exception ClassCastException if <code>listenerType</code>
* doesn't specify a class or interface that implements
* <code>java.util.EventListener</code>
*
* @see #getTableModelListeners
*
* @since 1.3
*/
public EventListener[] getListeners(Class listenerType) {
return listenerList.getListeners(listenerType);
}
} // End of class AbstractTableModel


And finally the CalendarModel class extending the AbstractTableModel

/*
* CalendarModel.java
*
* Created on 8 mars 2005, 17:41
*/

package com.shsolutions.utils;

import javax.swing.table.*;
import java.text.*;
import java.util.GregorianCalendar;
/**
*
* @author Laurent
*/
public class CalendarModel extends AbstractTableModel{

private String strDays[] = new String[7];
private GregorianCalendar calendar = new GregorianCalendar();
private Object data [][]= new Object [6][7];

/** Creates a new instance of CalendarModel */
public CalendarModel(int nMonth,int nYear){
String strTemp[];
int monthLength;
monthLength = daysInMonth(nMonth, nYear);
numDaysInWeek(nMonth, nYear, monthLength);
int i = 0;
strTemp = new DateFormatSymbols().getShortWeekdays();
for(;i<strTemp.length;i++)
{
if (i>0) strDays [i-1] = new String(strTemp[i]);
}


}


public int getRowCount () {
return 6;
}

public int getColumnCount () {
return 7;
}

public Object getValueAt(int r, int c){
return data[r][c];

}

public String getColumnName(int c){
return strDays[c];
}

public void setMonthCalendar (int nMonth, int nYear) {
int monthLength;
monthLength = daysInMonth(nMonth, nYear);
numDaysInWeek(nMonth, nYear, monthLength);
}

private int daysInMonth(int nMonth, int nYear) {
switch (nMonth)
{
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
return (31);
case 4:
case 6:
case 9:
case 11:
return (30);
default:
if (calendar.isLeapYear(nYear))
return (29);
else
return (28);


}
}

private void numDaysInWeek (int nMonth, int nYear, int nMonthLength) {
String [] astrWeek1 = new String[7];
String [] astrWeek2 = new String[7];
String [] astrWeek3 = new String[7];
String [] astrWeek4 = new String[7];
String [] astrWeek5 = new String[7];
String [] astrWeek6 = new String[7];
int firstDayOfNextWeek = 0;
int i;
calendar.set(nYear,nMonth,1);
int firstDayOfMonth = calendar.get(calendar.DAY_OF_WEEK);


switch (firstDayOfMonth){
case 1:
{
astrWeek1[0]="1";
astrWeek1[1]="2";
astrWeek1[2]="3";
astrWeek1[3]="4";
astrWeek1[4]="5";
astrWeek1[5]="6";
astrWeek1[6]="7";
firstDayOfNextWeek = 8;
break;
}
case 2:
{
astrWeek1[0]="";
astrWeek1[1]="1";
astrWeek1[2]="2";
astrWeek1[3]="3";
astrWeek1[4]="4";
astrWeek1[5]="5";
astrWeek1[6]="6";
firstDayOfNextWeek = 7;
break;
}
case 3:
{
astrWeek1[0]="";
astrWeek1[1]="";
astrWeek1[2]="1";
astrWeek1[3]="2";
astrWeek1[4]="3";
astrWeek1[5]="4";
astrWeek1[6]="5";
firstDayOfNextWeek = 6;
break;
}
case 4:
{
astrWeek1[0]="";
astrWeek1[1]="";
astrWeek1[2]="";
astrWeek1[3]="1";
astrWeek1[4]="2";
astrWeek1[5]="3";
astrWeek1[6]="4";
firstDayOfNextWeek = 5;
break;
}
case 5:
{
astrWeek1[0]="";
astrWeek1[1]="";
astrWeek1[2]="";
astrWeek1[3]="";
astrWeek1[4]="1";
astrWeek1[5]="2";
astrWeek1[6]="3";
firstDayOfNextWeek = 4;
break;
}
case 6:
{
astrWeek1[0]="";
astrWeek1[1]="";
astrWeek1[2]="";
astrWeek1[3]="";
astrWeek1[4]="";
astrWeek1[5]="1";
astrWeek1[6]="2";
firstDayOfNextWeek = 3;
break;
}
case 7:
{
astrWeek1[0]="";
astrWeek1[1]="";
astrWeek1[2]="";
astrWeek1[3]="";
astrWeek1[4]="";
astrWeek1[5]="";
astrWeek1[6]="1";
firstDayOfNextWeek = 2;
break;
}

}

int j = 0;
for (i = firstDayOfNextWeek;i<(firstDayOfNextWeek+7);i++)
{
astrWeek2[j]= Integer.toString(i);
j = j+1;
}

firstDayOfNextWeek = firstDayOfNextWeek + 7;
j=0;
for (i = firstDayOfNextWeek;i<(firstDayOfNextWeek+7);i++)
{

astrWeek3[j]= Integer.toString(i);
j=j+1;
}

firstDayOfNextWeek = firstDayOfNextWeek + 7;
j=0;
for (i = firstDayOfNextWeek;i<(firstDayOfNextWeek+7);i++)
{

astrWeek4[j]= Integer.toString(i);
j=j+1;
}

firstDayOfNextWeek = firstDayOfNextWeek + 7;
j=0;
for (i = firstDayOfNextWeek;i<(firstDayOfNextWeek+7);i++)
{
if (i<= nMonthLength)
{
astrWeek5[j]= Integer.toString(i);
j=j+1;
}
else
{
astrWeek5[j]= "";
j=j+1;

}
}

firstDayOfNextWeek = firstDayOfNextWeek +7;
j=0;
for (i = firstDayOfNextWeek;i<(firstDayOfNextWeek+7);i++)
{
if (i<= nMonthLength)
{
astrWeek6[j]= Integer.toString(i);
j=j+1;
}
else
{
astrWeek6[j]= "";
j=j+1;
}
}

Object [][] data = {astrWeek1,astrWeek2,astrWeek3,astrWeek4,astrWeek5,astrWeek6};
fireTableDataChanged();

}

}

Could someone tell me why the table stays empty when I run the application even if I test that the data vector is filled in correctly and the application runs without any error?

Thanks in advance for your precious help.
Greetings.

Laurent.
 
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