1 package org.apache.lucene.util.collections;
5 import org.apache.lucene.util.LuceneTestCase;
6 import org.apache.lucene.util.collections.LRUHashMap;
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25 public class TestLRUHashMap extends LuceneTestCase {
26 // testLRU() tests that the specified size limit is indeed honored, and
27 // the remaining objects in the map are indeed those that have been most
30 public void testLRU() throws Exception {
31 LRUHashMap<String, String> lru = new LRUHashMap<String, String>(3);
32 assertEquals(0, lru.size());
33 lru.put("one", "Hello world");
34 assertEquals(1, lru.size());
35 lru.put("two", "Hi man");
36 assertEquals(2, lru.size());
37 lru.put("three", "Bonjour");
38 assertEquals(3, lru.size());
39 lru.put("four", "Shalom");
40 assertEquals(3, lru.size());
41 assertNotNull(lru.get("three"));
42 assertNotNull(lru.get("two"));
43 assertNotNull(lru.get("four"));
44 assertNull(lru.get("one"));
45 lru.put("five", "Yo!");
46 assertEquals(3, lru.size());
47 assertNull(lru.get("three")); // three was last used, so it got removed
48 assertNotNull(lru.get("five"));
51 lru.put("seven", "hey dude");
52 assertEquals(3, lru.size());
53 assertNull(lru.get("one"));
54 assertNull(lru.get("two"));
55 assertNull(lru.get("three"));
56 assertNotNull(lru.get("four"));
57 assertNull(lru.get("five"));
58 assertNotNull(lru.get("six"));
59 assertNotNull(lru.get("seven"));