/*
* Apache License
* Version 2.0, January 2004
* http://www.apache.org/licenses/
*
* Copyright 2013 Aurelian Tutuianu
* Copyright 2014 Aurelian Tutuianu
* Copyright 2015 Aurelian Tutuianu
* Copyright 2016 Aurelian Tutuianu
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package rapaio.data.filter.var;
import rapaio.data.Var;
import java.util.function.Function;
/**
* Created by <a href="mailto:padreati@yahoo.com">Aurelian Tutuianu</a> at 12/4/14.
*/
public class VFUpdateIndex extends AbstractVF {
private static final long serialVersionUID = -9017598696178273627L;
public static VFUpdateIndex with(Function<Integer, Integer> f) {
return new VFUpdateIndex(f);
}
private final Function<Integer, Integer> f;
private VFUpdateIndex(Function<Integer, Integer> f) {
this.f = f;
}
@Override
public void fit(Var... vars) {
checkSingleVar(vars);
}
@Override
public Var apply(Var... vars) {
checkSingleVar(vars);
vars[0].stream().forEach(s -> s.setIndex(f.apply(s.index())));
return vars[0];
}
}