1 package org.apache.commons.jcs3.utils.struct;
2
3 /*
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21
22 /**
23 * Simple LRUMap implementation that keeps the number of the objects below or equal maxObjects
24 *
25 * @param <K>
26 * @param <V>
27 */
28 public class LRUMap<K, V> extends AbstractLRUMap<K, V>
29 {
30 /** if the max is less than 0, there is no limit! */
31 private int maxObjects = -1;
32
33 public LRUMap()
34 {
35 }
36
37 /**
38 *
39 * @param maxObjects
40 * maximum number to keep in the map
41 */
42 public LRUMap(final int maxObjects)
43 {
44 this();
45 this.maxObjects = maxObjects;
46 }
47
48 @Override
49 public boolean shouldRemove()
50 {
51 return maxObjects > 0 && this.size() > maxObjects;
52 }
53 }