/**
* 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.table.internal;
/**
* This implementation of {@link Column} is used to represent {@code null} attributes, i.e.
* attributes that were removed and are not set in a {@link ColumnarExampleTable}. This makes
* {@code null} checks unnecessary when iterating over all attribute indices.
*
* @author Jan Czogalla
* @see Column
* @see ColumnarExampleTable
* @since 7.3
*
*/
class NaNColumn implements Column {
private static final long serialVersionUID = 1L;
@Override
public double get(int row) {
return Double.NaN;
}
@Override
public void set(int row, double value) {
// do nothing
}
@Override
public void ensure(int size) {
// do nothing
}
@Override
public void setLast(int row, double value) {
// do nothing
}
}