code: ///////////////////////////////////////////////////////////////////////////////
  // For information as to what this class does, see the Javadoc, below.       //
  // Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,       //
  // 2007, 2008, 2009, 2010, 2014, 2015 by Peter Spirtes, Richard Scheines, Joseph   //
  // Ramsey, and Clark Glymour.                                                //
  //                                                                           //
  // This program 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 of the License, or         //
  // (at your option) any later version.                                       //
  //                                                                           //
  // 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 General Public License for more details.                              //
  //                                                                           //
  // You should have received a copy of the GNU General Public License         //
  // along with this program; if not, write to the Free Software               //
  // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA //
  ///////////////////////////////////////////////////////////////////////////////
  
  package edu.cmu.tetrad.session;
  
  
  /**
   * Basic implementation of SessionListener with empty methods.
   *
   * @author Joseph Ramsey
   */
  public class SessionAdapter implements SessionListener {
  
      /**
       * Indicates that a node has been added.
       */
      public void nodeAdded(SessionEvent event) {
      }
  
      /**
       * Indicates that a node has been removed.
       */
      public void nodeRemoved(SessionEvent event) {
      }
  
      /**
       * Indicates that a parent has been added to a node. Note that this implies
       * a child is added to the parent.
       */
      public void parentAdded(SessionEvent event) {
      }
  
      /**
       * Indicates that a parent has been removed from a node. Note that this
       * implies a child is removed from the parent.
       */
      public void parentRemoved(SessionEvent event) {
      }
  
      /**
       * Indicates that a model has been created for a node.
       */
      public void modelCreated(SessionEvent event) {
      }
  
      /**
       * Indicates that a model has been destroyed for a node.
       */
      public void modelDestroyed(SessionEvent event) {
      }
  
      /**
       * Indicates that the createModel method has been called but there is more
       * than one model consistent with the parents, so a choice has to be made.
       */
      public void modelUnclear(SessionEvent event) {
      }
  
      /**
       * Indicates that a new execution of a simulation edu.cmu.tetrad.study has begun. (Some
       * parameter objects need to be reset for every execution.
       */
      public void executionStarted(SessionEvent event) {
      }
  
      /**
       * Indicates that the repetition of some node has changed.
       */
      public void repetitionChanged(SessionEvent event) {
      }
  
      /**
       * Indicates that the model is contemplating adding an edge (but hasn't
       * yet).
       */
      public void addingEdge(SessionEvent event) {
      }
  }
  
  
  
  
  
  