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package de.lmu.ifi.dbs.elki.data;
/*
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 de.lmu.ifi.dbs.elki.math.linearalgebra.Vector;
import de.lmu.ifi.dbs.elki.utilities.datastructures.arraylike.ArrayAdapter;
import de.lmu.ifi.dbs.elki.utilities.datastructures.arraylike.NumberArrayAdapter;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.AbstractParameterizer;
/**
* Specialized class implementing a one-dimensional double vector without using
* an array. Saves a little bit of memory, albeit we cannot avoid boxing as long
* as we want to implement the interface.
*
* @author Erich Schubert
*/
public class OneDimensionalDoubleVector extends AbstractNumberVector<OneDimensionalDoubleVector, Double> {
/**
* Static factory instance
*/
public static final OneDimensionalDoubleVector STATIC = new OneDimensionalDoubleVector(Double.NaN);
/**
* The actual data value
*/
double val;
/**
* Constructor.
*
* @param val Value
*/
public OneDimensionalDoubleVector(double val) {
this.val = val;
}
@Override
public int getDimensionality() {
return 1;
}
@Override
public double doubleValue(int dimension) {
assert (dimension == 1) : "Non-existant dimension accessed.";
return val;
}
@Override
public long longValue(int dimension) {
assert (dimension == 1) : "Non-existant dimension accessed.";
return (long) val;
}
@Override
public Double getValue(int dimension) {
assert (dimension == 1) : "Incorrect dimension requested for 1-dimensional vector.";
return this.val;
}
@Override
public Vector getColumnVector() {
return new Vector(new double[] { val });
}
@Override
public <A> OneDimensionalDoubleVector newFeatureVector(A array, ArrayAdapter<Double, A> adapter) {
assert (adapter.size(array) == 1) : "Incorrect dimensionality for 1-dimensional vector.";
return new OneDimensionalDoubleVector(adapter.get(array, 0));
}
@Override
public <A> OneDimensionalDoubleVector newNumberVector(A array, NumberArrayAdapter<?, A> adapter) {
assert (adapter.size(array) == 1) : "Incorrect dimensionality for 1-dimensional vector.";
return new OneDimensionalDoubleVector(adapter.getDouble(array, 0));
}
/**
* Parameterization class
*
* @author Erich Schubert
*
* @apiviz.exclude
*/
public static class Parameterizer extends AbstractParameterizer {
@Override
protected OneDimensionalDoubleVector makeInstance() {
return STATIC;
}
}
}
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