/**
* Copyright (C) 2001-2017 by RapidMiner and the contributors
*
* Complete list of developers available at our web site:
*
* http://rapidminer.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;
import java.util.Iterator;
/**
* An iterator for attribute roles which is able to iterate over all attributes or skip either
* regular or special attributes.
*
* @author Ingo Mierswa
*/
public class AttributeRoleIterator implements Iterator<AttributeRole> {
private Iterator<AttributeRole> parent;
private int type = Attributes.REGULAR;
private AttributeRole current = null;
public AttributeRoleIterator(Iterator<AttributeRole> parent, int type) {
this.parent = parent;
this.type = type;
}
@Override
public boolean hasNext() {
while (current == null && parent.hasNext()) {
AttributeRole candidate = parent.next();
switch (type) {
case Attributes.REGULAR:
if (!candidate.isSpecial()) {
current = candidate;
}
break;
case Attributes.SPECIAL:
if (candidate.isSpecial()) {
current = candidate;
}
break;
case Attributes.ALL:
current = candidate;
break;
default:
break;
}
}
return current != null;
}
@Override
public AttributeRole next() {
if (current == null) {
hasNext();
}
AttributeRole returnValue = current;
current = null;
return returnValue;
}
@Override
public void remove() {
parent.remove();
this.current = null;
}
}