/*
* RapidMiner
*
* Copyright (C) 2001-2011 by Rapid-I and the contributors
*
* Complete list of developers available at our web site:
*
* http://rapid-i.com
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see http://www.gnu.org/licenses/.
*/
package com.rapidminer.example.set;
import com.rapidminer.example.Example;
import com.rapidminer.example.ExampleSet;
/**
* Returns only a subset of an example set specified by an instance of
* {@link Partition}.
*
* @author Simon Fischer, Ingo Mierswa
* ingomierswa Exp $
*/
public class IndexBasedExampleSetReader extends AbstractExampleReader {
/** Index of the current example. */
private int current;
private ExampleSet parent;
/** The next example that will be returned. */
private Example next;
private int size;
public IndexBasedExampleSetReader(ExampleSet parent) {
this.parent = parent;
this.size = parent.size();
current = -1;
hasNext();
}
public boolean hasNext() {
while (next == null) {
current++;
if (current >= size)
return false;
next = parent.getExample(current);
}
return true;
}
public Example next() {
if (!hasNext()) {
return null;
} else {
Example dummy = next;
next = null;
return dummy;
}
}
}