examplereaderdatarowreader.java

来自「著名的开源仿真软件yale」· Java 代码 · 共 58 行

/*
 *  YALE - Yet Another Learning Environment
 *  Copyright (C) 2002, 2003
 *      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;

/** Returns data rows that are backed by the examples returned by the example reader. 
 *  It is used to copy an ExampleSet.
 *  @version $Id: ExampleReaderDataRowReader.java,v 2.2 2003/04/23 13:45:42 fischer Exp $
 */
public class ExampleReaderDataRowReader implements DataRowReader {
    
    private ExampleReader reader;
    private DataRowFactory dataRowFactory;

    public ExampleReaderDataRowReader(DataRowFactory dataRowFactory, ExampleReader reader) {
	this.dataRowFactory = dataRowFactory;
	this.reader = reader;
    }

    public boolean hasNext() {
	return reader.hasNext();
    }
    public DataRow next() {
	Example e = reader.next();
	if (e == null) return null;

	int noa = e.getNumberOfAttributes();
	DataRow dataRow = dataRowFactory.create(noa);
	for (int i = 0; i < noa; i++)
	    dataRow.set(e.getAttribute(i), e.getValue(i));
	return dataRow;
    }
}