2 * Sone - ShellCache.java - Copyright © 2010 David Roden
4 * This program is free software: you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, either version 3 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 package net.pterodactylus.sone.data;
20 import java.util.HashMap;
24 * {@link Shell}-aware cache that will replace {@link Shell}s with the real
25 * objects but not the other way around.
28 * The type of the cached objects
29 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
31 public class ShellCache<T> {
33 /** The object cache. */
34 private final Map<String, T> cache = new HashMap<String, T>();
37 * Stores the given object in this cache. If the given object is not a
38 * {@link Shell}, it is stored. If it is a {@link Shell} it is only stored
39 * if there is no object stored for the given ID.
42 * The ID of the object
46 public void put(String id, T object) {
47 if (!(object instanceof Shell<?>) || !cache.containsKey(id)) {
48 cache.put(id, object);
53 * Returns the post with the given ID.
57 * @return The post with the given ID, or {@code null} if there is no post
60 public T get(String id) {