/*!
* This program is free software; you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
* Foundation.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* or from the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* This program 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 Lesser General Public License for more details.
*
* Copyright (c) 2002-2013 Pentaho Corporation..  All rights reserved.
*/

package org.pentaho.reporting.designer.core.status;

import org.pentaho.reporting.designer.core.util.exceptions.UncaughtExceptionsModel;

import javax.swing.*;
import javax.swing.event.EventListenerList;
import javax.swing.event.ListDataEvent;
import javax.swing.event.ListDataListener;

/**
 * Todo: Document Me
 *
 * @author Thomas Morgner
 */
public class ExceptionsListModel implements ListModel {
  private EventListenerList listenerList;
  private Throwable[] throwables;

  public ExceptionsListModel() {
    this.listenerList = new EventListenerList();
    this.throwables = UncaughtExceptionsModel.getInstance().getThrowables();
  }

  /**
   * Returns the length of the list.
   *
   * @return the length of the list
   */
  public int getSize() {
    return throwables.length;
  }

  /**
   * Returns the value at the specified index.
   *
   * @param index the requested index
   * @return the value at <code>index</code>
   */
  public Object getElementAt( final int index ) {
    return throwables[ index ];
  }

  /**
   * Adds a listener to the list that's notified each time a change to the data model occurs.
   *
   * @param l the <code>ListDataListener</code> to be added
   */
  public void addListDataListener( final ListDataListener l ) {
    listenerList.add( ListDataListener.class, l );
  }

  /**
   * Removes a listener from the list that's notified each time a change to the data model occurs.
   *
   * @param l the <code>ListDataListener</code> to be removed
   */
  public void removeListDataListener( final ListDataListener l ) {
    listenerList.remove( ListDataListener.class, l );
  }

  protected void fireListUpdate() {
    final ListDataListener[] listDataListeners = listenerList.getListeners( ListDataListener.class );
    final ListDataEvent event = new ListDataEvent( this, ListDataEvent.CONTENTS_CHANGED, -1, -1 );
    for ( int i = 0; i < listDataListeners.length; i++ ) {
      final ListDataListener listener = listDataListeners[ i ];
      listener.contentsChanged( event );
    }
  }

  public void refresh() {
    this.throwables = UncaughtExceptionsModel.getInstance().getThrowables();
    fireListUpdate();
  }
}