Mercurial > jhg

comparison hg4j/src/main/java/org/tmatesoft/hg/internal/Pool.java @ 213:6ec4af642ba8 gradle

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Project uses Gradle for build - actual changes
author Alexander Kitaev <kitaev@gmail.com>
date Tue, 10 May 2011 10:52:53 +0200
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212:edb2e2829352 213:6ec4af642ba8
1 /*
2 * Copyright (c) 2011 TMate Software Ltd
3 *
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; version 2 of the License.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * For information on how to redistribute this software under
14 * the terms of a license other than GNU General Public License
15 * contact TMate Software at support@hg4j.com
16 */
17 package org.tmatesoft.hg.internal;
18
19 import java.util.HashMap;
20
21 /**
22 * Instance pooling.
23 *
24 * @author Artem Tikhomirov
25 * @author TMate Software Ltd.
26 */
27 public class Pool<T> {
28 private final HashMap<T,T> unify = new HashMap<T, T>();
29
30 public T unify(T t) {
31 T rv = unify.get(t);
32 if (rv == null) {
33 // first time we see a new value
34 unify.put(t, t);
35 rv = t;
36 }
37 return rv;
38 }
39
40 @Override
41 public String toString() {
42 StringBuilder sb = new StringBuilder();
43 sb.append(Pool.class.getSimpleName());
44 sb.append('<');
45 if (!unify.isEmpty()) {
46 sb.append(unify.keySet().iterator().next().getClass().getName());
47 }
48 sb.append('>');
49 sb.append(':');
50 sb.append(unify.size());
51 return sb.toString();
52 }
53 }