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 */
021
022
023package org.biojava.bio.dist;
024
025import org.biojava.bio.symbol.AtomicSymbol;
026import org.biojava.bio.symbol.IllegalSymbolException;
027
028/**
029 * A distribution trainer that just ignores all counts.
030 *
031 * @author Matthew Pocock
032 * @since 1.0
033 */
034public class IgnoreCountsTrainer implements DistributionTrainer {
035  public void addCount(DistributionTrainerContext dtc, AtomicSymbol sym, double times) 
036    throws IllegalSymbolException {}
037  public double getCount(DistributionTrainerContext dtc, AtomicSymbol sym)
038  throws IllegalSymbolException {
039    return 0.0;
040  }
041  
042  public void train(DistributionTrainerContext dtc, double weight) {}
043  public void clearCounts(DistributionTrainerContext dtc) {}
044
045  /**
046   * Constructor intended for sub-classes.
047   */
048  protected IgnoreCountsTrainer() {}
049  
050  private static IgnoreCountsTrainer instance = new IgnoreCountsTrainer();
051
052  /**
053   * Returns the global singleton instance of the IgnoreCountsTrainer.
054   *
055   * @return the singleton instance of this trainer
056   */
057  public static IgnoreCountsTrainer getInstance() {
058    return instance;
059  }
060}