001/*
002 *                    BioJava development code
003 *
004 * This code may be freely distributed and modified under the
005 * terms of the GNU Lesser General Public Licence.  This should
006 * be distributed with the code.  If you do not have a copy,
007 * see:
008 *
009 *      http://www.gnu.org/copyleft/lesser.html
010 *
011 * Copyright for this code is held jointly by the individual
012 * authors.  These should be listed in @author doc comments.
013 *
014 * For more information on the BioJava project and its aims,
015 * or to join the biojava-l mailing list, visit the home page
016 * at:
017 *
018 *      http://www.biojava.org/
019 *
020 */
021package org.biojava.utils;
022
023import java.io.InvalidObjectException;
024import java.io.ObjectStreamException;
025import java.io.Serializable;
026import java.lang.reflect.Field;
027
028/**
029 * @author Matthew Pocock
030 */
031public class StaticMemberPlaceHolder implements Serializable {
032  private String className;
033  private String fieldName;
034  
035  public StaticMemberPlaceHolder(Field field) {
036    this.className = field.getDeclaringClass().getName();
037    this.fieldName = field.getName();
038  }
039  
040  protected StaticMemberPlaceHolder() {}
041  
042  public Object readResolve() throws ObjectStreamException {
043    try {
044      Class c = Class.forName(className);
045      Field f = c.getDeclaredField(fieldName);
046      return f.get(null);
047    } catch (Exception e) {
048      throw new InvalidObjectException(
049        "Unable to retrieve static field " + fieldName + 
050        "for class " + className + " because:\n" +
051        e.getMessage()
052      );
053    }
054  }
055}