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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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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 TableModel interface. It takes care of
 the management of listeners and provides some conveniences for generating
 TableModelEvents and dispatching them to the listeners.
 To create a concrete TableModel as a subclass of
 AbstractTableModel you need only provide implementations
 for the following three methods:
 
 public int getRowCount();
 public int getColumnCount();
 public Object getValueAt(int row, int column);
 



Warning:
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™
has been added to the java.beans package. Please see XMLEncoder. 
Author:Alan Chung, Philip Milne
/**
 *  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&trade;
 * has been added to the <code>java.beans</code> package.
 * Please see {@link java.beans.XMLEncoder}.
 *
 * @author Alan Chung
 * @author Philip Milne
 */
@SuppressWarnings("serial") // Same-version serialization only
public abstract class AbstractTableModel implements TableModel, Serializable
{
//
// Instance Variables
//

    
List of listeners 
/** 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 column cannot be found,
 returns an empty string.

Params:
  • column –  the column being queried
Returns:a string containing the default name of column
/**
     *  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 TableModel interface and is not used by the
JTable.

Params:
  • columnName – string containing name of column to be located
Returns:the column with columnName, or -1 if not found
/**
     * 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 Object.class regardless of columnIndex.
 @param columnIndex  the column being queried
 @return the Object.class

/**
     *  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

/**
     *  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

/**
     *  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.

Params:
  • l –               the TableModelListener
/**
     * Adds a listener to the list that's notified each time a change
     * to the data model occurs.
     *
     * @param   l               the 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.

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

    
Returns an array of all the table model listeners
registered on this model.

See Also:
Returns:all of this model's TableModelListeners
        or an empty
        array if no table model listeners are currently registered
Since:1.4
/**
     * 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 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 JTable 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 Also:
/**
     * 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 JTable receives this event and its
autoCreateColumnsFromModel
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 setModel(TableModel) on the
JTable.

See Also:
/**
     * 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
[firstRow, lastRow], inclusive, have been inserted.

Params:
  • firstRow –  the first row
  • lastRow –   the last row
See Also:
/**
     * 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
[firstRow, lastRow], inclusive, have been updated.

Params:
  • firstRow –  the first row
  • lastRow –   the last row
See Also:
/**
     * 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
[firstRow, lastRow], inclusive, have been deleted.

Params:
  • firstRow –  the first row
  • lastRow –   the last row
See Also:
/**
     * 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
[row, column] has been updated.

Params:
  • row –  row of cell which has been updated
  • column –  column of cell which has been updated
See Also:
/**
     * 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
TableModelListeners that registered
themselves as listeners for this table model.

Params:
  • e –  the event to be forwarded
See Also:
/**
     * 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 FooListeners
upon this AbstractTableModel.
FooListeners are registered using the
addFooListener method.


You can specify the listenerType argument
with a class literal,
such as
FooListener.class.
For example, you can query a
model m
for its table model listeners with the following code:

TableModelListener[] tmls = (TableModelListener[])(m.getListeners(TableModelListener.class));

If no such listeners exist, this method returns an empty array.

Params:
  • listenerType – the type of listeners requested
Type parameters:
  • <T> – the listener type
Throws:
  • ClassCastException – if listenerType
         doesn't specify a class or interface that implements
         java.util.EventListener
See Also:
Returns:an array of all objects registered as
         FooListeners on this component,
         or an empty array if no such
         listeners have been added
Since:1.3
/**
     * 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 <T> the listener type
     * @param listenerType the type of listeners requested
     * @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 <T extends EventListener> T[] getListeners(Class<T> listenerType) {
        return listenerList.getListeners(listenerType);
    }
} // End of class AbstractTableModel