content: /* ========================================================================
   * JCommon : a free general purpose class library for the Java(tm) platform
   * ========================================================================
   *
   * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
   * 
   * Project Info:  http://www.jfree.org/jcommon/index.html
   *
   * This library is free software; you can redistribute it and/or modify it 
   * under the terms of the GNU Lesser General Public License as published by 
   * the Free Software Foundation; either version 2.1 of the License, or 
   * (at your option) any later version.
   *
   * This library 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.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 
   * USA.  
   *
   * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
   * in the United States and other countries.]
   * 
   * -----------------------
   * ActionConcentrator.java
   * -----------------------
   * (C)opyright 2003, 2004, by Thomas Morgner and Contributors.
   *
   * Original Author:  Thomas Morgner;
   * Contributor(s):   David Gilbert (for Object Refinery Limited);
   *
   * $Id: ActionConcentrator.java,v 1.4 2007/11/02 17:50:36 taqua Exp $
   *
   * Changes
   * -------
   * 24-Aug-2003 : Initial version
   * 07-Jun-2004 : Corrected source headers (DG);
   */
  
  package org.jfree.ui.action;
  
  import java.util.ArrayList;
  import javax.swing.Action;
  
  /**
   * This class is used to collect actions to be enabled or disabled
   * by a sinle call.
   * 
   * @author Thomas Morgner
   */
  public class ActionConcentrator {
  
      /** The collection used to store the actions of this concentrator. */
      private final ArrayList actions;
  
      /**
       * DefaultConstructor.
       */
      public ActionConcentrator() {
          this.actions = new ArrayList();
      }
  
      /**
       * Adds the action to this concentrator.
       * 
       * @param a the action to be added.
       */
      public void addAction(final Action a) {
          if (a == null) {
              throw new NullPointerException();
          }
          this.actions.add(a);
      }
  
      /**
       * Removes the action from this concentrator.
       * 
       * @param a the action to be removed.
       */
      public void removeAction(final Action a) {
          if (a == null) {
              throw new NullPointerException();
          }
          this.actions.remove(a);
      }
  
      /**
       * Defines the state for all actions. 
       * 
       * @param b the new state for all actions.
       */
      public void setEnabled(final boolean b) {
          for (int i = 0; i < this.actions.size(); i++) {
              final Action a = (Action) this.actions.get(i);
              a.setEnabled(b);
          }
      }
  
      /**
       * Returns, whether all actions are disabled.
       * If one action is enabled, then this method will return
       * true.
       * 
       * @return true, if at least one action is enabled, false
       * otherwise.
       */
      public boolean isEnabled() {
          for (int i = 0; i < this.actions.size(); i++) {
              final Action a = (Action) this.actions.get(i);
              if (a.isEnabled()) {
                  return true;
              }
          }
          return false;
      }
      
  }
  