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package de.lmu.ifi.dbs.elki.parallel.processor;
/*
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.database.ids.DBIDRef;
import de.lmu.ifi.dbs.elki.math.DoubleMinMax;
import de.lmu.ifi.dbs.elki.parallel.Executor;
import de.lmu.ifi.dbs.elki.parallel.variables.SharedDouble;
/**
* Sink collecting minimum and maximum values.
*
* @author Erich Schubert
*
* @apiviz.has Instance
* @apiviz.uses SharedDouble
* @apiviz.has DoubleMinMax
*/
public class DoubleMinMaxProcessor implements Processor {
/**
* The central data store.
*/
DoubleMinMax minmax = new DoubleMinMax();
/**
* Input channel
*/
SharedDouble input;
/**
* Constructor.
*/
public DoubleMinMaxProcessor() {
super();
}
/**
* Connect an input channel.
*
* @param input Input channel
*/
public void connectInput(SharedDouble input) {
this.input = input;
}
@Override
public Instance instantiate(Executor executor) {
return new Instance(executor.getInstance(input));
}
@Override
public void cleanup(Processor.Instance inst) {
merge(((Instance) inst).minmax);
}
/**
* Merge the result of an instance.
*
* @param minmax Minmax value
*/
protected synchronized void merge(DoubleMinMax minmax) {
this.minmax.put(minmax.getMin());
this.minmax.put(minmax.getMax());
}
/**
* Get the minmax object.
*
* @return Minmax object
*/
public DoubleMinMax getMinMax() {
return minmax;
}
/**
* Instance for a particular sub-channel / part of the data set.
*
* @author Erich Schubert
*/
private static class Instance implements Processor.Instance {
/**
* The central data store.
*/
private DoubleMinMax minmax = new DoubleMinMax();
/**
* Input channel instance
*/
private SharedDouble.Instance input;
/**
* Constructor.
*
* @param input Input channel instance.
*/
public Instance(SharedDouble.Instance input) {
super();
this.input = input;
}
@Override
public void map(DBIDRef id) {
minmax.put(input.doubleValue());
}
}
}
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