/**
* 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.operator.preprocessing.transformation.aggregation;
import com.rapidminer.example.Attribute;
import com.rapidminer.example.Example;
import com.rapidminer.example.table.DataRow;
/**
* @author Marius Helf
*
*/
public class ConcatAggregator implements Aggregator {
private ConcatAggregationFunction function;
boolean first = true;
private StringBuilder concatenation = new StringBuilder();
public ConcatAggregator(ConcatAggregationFunction concatAggregationFunction) {
this.function = concatAggregationFunction;
}
@Override
public void count(Example example) {
Attribute sourceAttribute = function.getSourceAttribute();
double value = example.getValue(sourceAttribute);
if (!Double.isNaN(value)) {
if (first) {
first = false;
} else {
concatenation.append(function.getSeparator());
}
String nominalValue = sourceAttribute.getMapping().mapIndex((int) value);
concatenation.append(nominalValue);
}
}
@Override
public void count(Example example, double weight) {
count(example);
}
@Override
public void set(Attribute attribute, DataRow row) {
int idx = attribute.getMapping().mapString(concatenation.toString());
attribute.setValue(row, idx);
}
}