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package de.lmu.ifi.dbs.elki.datasource.filter.transform;
/*
This file is part of ELKI:
Environment for Developing KDD-Applications Supported by Index-Structures
Copyright (C) 2014
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.projection.Projection;
import de.lmu.ifi.dbs.elki.data.type.SimpleTypeInformation;
import de.lmu.ifi.dbs.elki.data.type.TypeInformation;
import de.lmu.ifi.dbs.elki.datasource.filter.AbstractStreamConversionFilter;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.AbstractParameterizer;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.OptionID;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.parameterization.Parameterization;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.parameters.ObjectParameter;
/**
* Apply a projection to the data.
*
* @author Erich Schubert
*
* @apiviz.composedOf Projection
*
* @param <I> Input type
* @param <O> Output type
*/
public class ProjectionFilter<I, O> extends AbstractStreamConversionFilter<I, O> {
/**
* Projection to apply.
*/
Projection<I, O> projection;
/**
* Constructor.
*
* @param projection Projection
*/
public ProjectionFilter(Projection<I, O> projection) {
super();
this.projection = projection;
}
@Override
protected O filterSingleObject(I obj) {
return projection.project(obj);
}
@Override
protected TypeInformation getInputTypeRestriction() {
return projection.getInputDataTypeInformation();
}
@Override
protected SimpleTypeInformation<? super O> convertedType(SimpleTypeInformation<I> in) {
projection.initialize(in);
return projection.getOutputDataTypeInformation();
}
/**
* Parameterization class.
*
* @author Erich Schubert
*
* @apiviz.exclude
*
* @param <I> Input type
* @param <O> Output type
*/
public static class Parameterizer<I, O> extends AbstractParameterizer {
/**
* Parameter to specify the projection to use
* <p>
* Key: {@code -projection}
* </p>
*/
public static final OptionID PROJ_ID = new OptionID("projection", "Projection to use.");
/**
* Projection to apply.
*/
Projection<I, O> projection;
@Override
protected void makeOptions(Parameterization config) {
super.makeOptions(config);
ObjectParameter<Projection<I, O>> projP = new ObjectParameter<>(PROJ_ID, Projection.class);
if (config.grab(projP)) {
projection = projP.instantiateClass(config);
}
}
@Override
protected ProjectionFilter<I, O> makeInstance() {
return new ProjectionFilter<>(projection);
}
}
}
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