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package cgeo.geocaching.utils;
import static org.assertj.core.api.Assertions.assertThat;
import cgeo.geocaching.Geocache;
import java.util.Set;
public class LeastRecentlyUsedSetTest extends AbstractLRUTest {
public static void testLruMode() {
final Set<String> set = new LeastRecentlyUsedSet<String>(5);
set.add("one");
set.add("two");
set.add("three");
// read does not change anything
set.contains("one");
set.add("four");
// re-put should update the order
set.add("three");
set.add("five");
// read does not change anything
set.contains("one");
set.add("six");
set.add("seven");
assertEquals("four, three, five, six, seven", colToStr(set));
}
public static void testRemoveEldestEntry() {
final LeastRecentlyUsedSet<Geocache> caches = new LeastRecentlyUsedSet<Geocache>(10);
final Geocache first = new Geocache();
first.setGeocode("1");
assertThat(caches.add(first)).isTrue();
final Geocache second = new Geocache();
second.setGeocode("2");
assertThat(caches.add(second)).isTrue();
assertThat(caches).hasSize(2);
assertThat(caches.contains(first)).isTrue();
assertThat(caches.contains(second)).isTrue();
// adding first cache again does not change set
assertThat(caches.add(first)).isFalse();
assertThat(caches).hasSize(2);
for (int i = 3; i <= 10; i++) {
final Geocache cache = new Geocache();
cache.setGeocode(Integer.toString(i));
assertThat(caches.add(cache)).isTrue();
}
assertThat(caches).hasSize(10);
assertThat(caches.contains(first)).isTrue();
assertThat(caches.contains(second)).isTrue();
final Geocache c11 = new Geocache();
c11.setGeocode("11");
assertThat(caches.add(c11)).isTrue();
assertThat(caches).hasSize(10);
// first was used again, there second is the oldest and has been overwritten by 11
assertThat(caches.contains(first)).isTrue();
assertThat(caches.contains(second)).isFalse();
}
}
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