/*
* LensKit, an open source recommender systems toolkit.
* Copyright 2010-2014 LensKit Contributors. See CONTRIBUTORS.md.
* Work on LensKit has been funded by the National Science Foundation under
* grants IIS 05-34939, 08-08692, 08-12148, and 10-17697.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 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 General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 51
* Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
package org.grouplens.lenskit.vectors;
import it.unimi.dsi.fastutil.longs.LongLists;
import org.grouplens.lenskit.indexes.IdIndexMapping;
import org.grouplens.lenskit.indexes.MutableIdIndexMapping;
import org.junit.Test;
import static org.hamcrest.Matchers.equalTo;
import static org.junit.Assert.assertThat;
/**
* @author <a href="http://www.grouplens.org">GroupLens Research</a>
*/
public class VectorsTest {
@Test
public void testFromEmptyArray() {
MutableSparseVector msv =
Vectors.fromArray(IdIndexMapping.create(LongLists.EMPTY_LIST),
new double[0]);
assertThat(msv.size(), equalTo(0));
}
@Test
public void testFromSingletonArray() {
MutableSparseVector msv =
Vectors.fromArray(IdIndexMapping.create(LongLists.singleton(10)),
new double[]{Math.PI});
assertThat(msv.size(), equalTo(1));
assertThat(msv.get(10), equalTo(Math.PI));
}
@Test
public void testFromBiggerArray() {
MutableIdIndexMapping map = new MutableIdIndexMapping();
map.internId(42);
map.internId(39);
MutableSparseVector msv =
Vectors.fromArray(map, new double[]{Math.PI, Math.E});
assertThat(msv.size(), equalTo(2));
assertThat(msv.get(42), equalTo(Math.PI));
assertThat(msv.get(39), equalTo(Math.E));
}
}