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package de.lmu.ifi.dbs.elki.index.preprocessed.preference;
/*
This file is part of ELKI:
Environment for Developing KDD-Applications Supported by Index-Structures
Copyright (C) 2012
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 java.util.BitSet;
import de.lmu.ifi.dbs.elki.data.NumberVector;
import de.lmu.ifi.dbs.elki.data.type.TypeInformation;
import de.lmu.ifi.dbs.elki.data.type.TypeUtil;
import de.lmu.ifi.dbs.elki.database.ids.DBIDRef;
import de.lmu.ifi.dbs.elki.database.relation.Relation;
import de.lmu.ifi.dbs.elki.index.preprocessed.AbstractPreprocessorIndex;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.Parameterizable;
/**
* Abstract base class for preference vector based algorithms.
*
* @author Erich Schubert
*
* @param <NV> Number vector
*/
public abstract class AbstractPreferenceVectorIndex<NV extends NumberVector<?, ?>> extends AbstractPreprocessorIndex<NV, BitSet> implements PreferenceVectorIndex<NV> {
/**
* Constructor.
*
* @param relation Relation to use
*/
public AbstractPreferenceVectorIndex(Relation<NV> relation) {
super(relation);
}
/**
* Preprocessing step.
*/
abstract protected void preprocess();
@Override
public BitSet getPreferenceVector(DBIDRef objid) {
if(storage == null) {
preprocess();
}
return storage.get(objid);
}
/**
* Factory class
*
* @author Erich Schubert
*
* @apiviz.stereotype factory
* @apiviz.uses AbstractPreferenceVectorIndex oneway - - «create»
*/
public static abstract class Factory<V extends NumberVector<?, ?>, I extends PreferenceVectorIndex<V>> implements PreferenceVectorIndex.Factory<V, I>, Parameterizable {
@Override
public abstract I instantiate(Relation<V> relation);
@Override
public TypeInformation getInputTypeRestriction() {
return TypeUtil.NUMBER_VECTOR_FIELD;
}
}
}
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