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package de.lmu.ifi.dbs.elki.evaluation.scores.adapter;
/*
This file is part of ELKI:
Environment for Developing KDD-Applications Supported by Index-Structures
Copyright (C) 2015
Ludwig-Maximilians-Universität München
Lehr- und Forschungseinheit für Datenbanksysteme
ELKI Development Team
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/>.
*/
import de.lmu.ifi.dbs.elki.data.NumberVector;
import de.lmu.ifi.dbs.elki.math.MathUtil;
import de.lmu.ifi.dbs.elki.utilities.datastructures.arrays.IntegerArrayQuickSort;
import de.lmu.ifi.dbs.elki.utilities.datastructures.arrays.IntegerComparator;
/**
* Class to iterate over a number vector in decreasing order.
*
* @author Erich Schubert
*
* @apiviz.composedOf NumberVector
*/
public class DecreasingVectorIter extends AbstractVectorIter implements IntegerComparator {
/**
* Constructor.
*
* @param vec Vector to iterate over.
*/
public DecreasingVectorIter(NumberVector vec) {
super(vec);
this.sort = MathUtil.sequence(0, vec.getDimensionality());
IntegerArrayQuickSort.sort(sort, this);
}
@Override
public int compare(int x, int y) {
return Double.compare(vec.doubleValue(y), vec.doubleValue(x));
}
@Override
public DecreasingVectorIter advance(int count) {
pos += count;
return this;
}
@Override
public DecreasingVectorIter retract() {
pos--;
return this;
}
@Override
public DecreasingVectorIter seek(int off) {
pos = off;
return this;
}
}
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