yaleidmapping.java

一个很好的LIBSVM的JAVA源码。对于要研究和改进SVM算法的学者。可以参考。来自数据挖掘工具YALE工具包。

/*
 *  YALE - Yet Another Learning Environment
 *  Copyright (C) 2001-2004
 *      Simon Fischer, Ralf Klinkenberg, Ingo Mierswa, 
 *          Katharina Morik, Oliver Ritthoff
 *      Artificial Intelligence Unit
 *      Computer Science Department
 *      University of Dortmund
 *      44221 Dortmund,  Germany
 *  email: [e-mail]
 *  web:   http://yale.cs.uni-dortmund.de/
 *
 *  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.udo.cs.yale.example;

import edu.udo.cs.yale.example.Example;

import java.util.HashMap;
import java.util.Iterator;

/** This class implements the mapping between Yale Examples and Ids. Since this is a task which
 *  is not necessary for the most learning applications, the mapping is not implemented in the standard
 *  example sets for performance reasons. Please make sure that only a correct mapping is used in a
 *  Yale experiment and rebuild it if necessary.
 * 
 *  @yale.todo Change String ids to double
 *
 *  @author Michael Wurst, Ingo Mierswa
 *  @version $Id: YaleIdMapping.java,v 1.2 2004/03/24 16:03:17 wurst Exp $
 */
public class YaleIdMapping extends HashMap {

    private static YaleIdMapping defaultMapping = new YaleIdMapping();

	
    /** Adds an object to the mapping.
     *  @param e the example representing the object (has to have an Id).
     */
    public void addObject(Example e) {	
	put(getIdFromExample(e), e);
    }

    public void addExampleSet(ExampleSet es){
    	
    	ExampleReader er = es.getExampleReader();
    	while(er.hasNext())	
    		addObject(er.next());
    }
    
    /** Get an example given an id.
     *  @param id the id
     *  @return Example
     */
    public Example getExampleFromId(String id) {
	return (Example)get(id);
    }

    /** Get an id given an example.
     *  @param e the example
     *  @return String
     */
    public String getIdFromExample(Example e) {	
	return e.getIdAsString();
    }
	
    /** Get all ids that mapped.
     *  @return Iterator
     */
    public Iterator getAllIds() {	
	return keySet().iterator();	
    }
    
    /** Get the default mapping.
     *  @return YaleIdMapping
     */
    public static YaleIdMapping getDefaultMapping() {
	return defaultMapping;	
    }
}