content: /*
   *    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., 675 Mass Ave, Cambridge, MA 02139, USA.
   */
  
  /*
   *    PropertyNode.java
   *    Copyright (C) 1999 University of Waikato, Hamilton, New Zealand
   *
   */
  
  package weka.experiment;
  
  import weka.core.RevisionHandler;
  import weka.core.RevisionUtils;
  
  import java.beans.IntrospectionException;
  import java.beans.PropertyDescriptor;
  import java.io.IOException;
  import java.io.Serializable;
  
  /**
   * Stores information on a property of an object: the class of the
   * object with the property; the property descriptor, and the current
   * value.
   *
   * @author Len Trigg (trigg@cs.waikato.ac.nz)
   * @version $Revision: 1.7 $
   */
  public class PropertyNode
    implements Serializable, RevisionHandler {
  
    /** for serialization */
    private static final long serialVersionUID = -8718165742572631384L;
  
    /** The current property value */
    public Object value;
  
    /** The class of the object with this property */
    public Class parentClass;
  
    /** Other info about the property */
    public PropertyDescriptor property;
    
    /**
     * Creates a mostly empty property.
     *
     * @param pValue a property value.
     */
    public PropertyNode(Object pValue) {
      
      this(pValue, null, null);
    }
  
    /**
     * Creates a fully specified property node.
     *
     * @param pValue the current property value.
     * @param prop the PropertyDescriptor.
     * @param pClass the Class of the object with this property.
     */
    public PropertyNode(Object pValue, PropertyDescriptor prop, Class pClass) {
      
      value = pValue;
      property = prop;
      parentClass = pClass;
    }
  
    /**
     * Returns a string description of this property.
     *
     * @return a value of type 'String'
     */
    public String toString() {
      
      if (property == null) {
        return "Available properties";
      }
      return property.getDisplayName();
    }
  
    /*
     * Handle serialization ourselves since PropertyDescriptor isn't
     * serializable
     */
    private void writeObject(java.io.ObjectOutputStream out) throws IOException {
  
      try {
        out.writeObject(value);
      } catch (Exception ex) {
        throw new IOException("Can't serialize object: " + ex.getMessage());
      }
      out.writeObject(parentClass);
      out.writeObject(property.getDisplayName());
      out.writeObject(property.getReadMethod().getName());
      out.writeObject(property.getWriteMethod().getName());
    }
    private void readObject(java.io.ObjectInputStream in)
      throws IOException, ClassNotFoundException {
  
      value = in.readObject();
      parentClass = (Class) in.readObject();
      String name = (String) in.readObject();
      String getter = (String) in.readObject();
      String setter = (String) in.readObject();
      /*
      System.err.println("Loading property descriptor:\n"
  		       + "\tparentClass: " + parentClass.getName()
  		       + "\tname: " + name
  		       + "\tgetter: " + getter
  		       + "\tsetter: " + setter);
      */
      try {
        property = new PropertyDescriptor(name, parentClass, getter, setter);
      } catch (IntrospectionException ex) {
        throw new ClassNotFoundException("Couldn't create property descriptor: "
  				       + parentClass.getName() + "::"
  				       + name);
      }
    }
    
    /**
     * Returns the revision string.
     * 
     * @return		the revision
     */
    public String getRevision() {
      return RevisionUtils.extract("$Revision: 1.7 $");
    }
  } // PropertyNode
  