/*
* 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.collections;
import com.google.common.collect.Lists;
import com.google.common.primitives.Longs;
import it.unimi.dsi.fastutil.longs.LongSet;
import org.junit.Test;
import java.util.List;
import static org.hamcrest.Matchers.contains;
import static org.hamcrest.Matchers.equalTo;
import static org.junit.Assert.assertThat;
/**
* Test long sorted array set.
* @author <a href="http://www.grouplens.org">GroupLens Research</a>
*/
public class RemovableLongSortedArraySetTest {
@Test
public void testEmptySet() {
LongSet ls = LongKeyDomain.empty().modifiableActiveSetView();
assertThat(ls.remove(42), equalTo(false));
}
@Test
public void testRemovePresent() {
LongKeyDomain lks = LongKeyDomain.create(42);
LongSet ls = lks.modifiableActiveSetView();
assertThat(ls.remove(42), equalTo(true));
assertThat(ls.size(), equalTo(0));
assertThat(lks.size(), equalTo(0));
assertThat(lks.keyIsActive(42), equalTo(false));
}
@Test
public void testRemoveNotPResent() {
LongKeyDomain lks = LongKeyDomain.create(42);
LongSet ls = lks.modifiableActiveSetView();
assertThat(ls.remove(39), equalTo(false));
assertThat(ls.size(), equalTo(1));
assertThat(lks.size(), equalTo(1));
assertThat(lks.keyIsActive(42), equalTo(true));
}
@Test
public void testRemoveAll() {
LongKeyDomain lks = LongKeyDomain.create(20, 25, 30, 42, 62);
LongSet ls = lks.modifiableActiveSetView();
List<Long> rm = Longs.asList(20, 25, 62, 30, 98, 1);
assertThat(ls.removeAll(rm), equalTo(true));
assertThat(ls, contains(42L));
assertThat(lks.size(), equalTo(1));
}
@Test
public void testRetainAll() {
LongKeyDomain lks = LongKeyDomain.create(20, 25, 30, 42, 62, 99);
LongSet ls = lks.modifiableActiveSetView();
List<Long> rm = Longs.asList(20, 25, 62, 30, 98, 1);
assertThat(ls.retainAll(rm), equalTo(true));
assertThat(ls, contains(20L, 25L, 30L, 62L));
assertThat(Lists.newArrayList(lks.activeIndexIterator(false)),
contains(0, 1, 2, 4));
}
@Test
public void testRetainAllEmptyList() {
LongKeyDomain lks = LongKeyDomain.create(20, 25, 30, 42, 62, 99);
LongSet ls = lks.modifiableActiveSetView();
assertThat(ls.retainAll(Lists.newArrayList()), equalTo(true));
assertThat(ls.isEmpty(), equalTo(true));
}
@Test
public void testRetainAllLongMaxLong() {
LongKeyDomain lks = LongKeyDomain.create(20, Long.MAX_VALUE);
LongSet ls = lks.modifiableActiveSetView();
assertThat(ls.retainAll(Lists.newArrayList()), equalTo(true));
assertThat(ls.isEmpty(), equalTo(true));
}
}