Mercurial > jhg
annotate src/org/tmatesoft/hg/internal/Pool.java @ 204:883f1efbcf27
Add clone,incoming and outging tests
author | Artem Tikhomirov <tikhomirov.artem@gmail.com> |
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date | Tue, 26 Apr 2011 23:58:15 +0200 (2011-04-26) |
parents | e2115da4cf6a |
children | 3dcd3dd90c77 |
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1 /* |
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2 * Copyright (c) 2011 TMate Software Ltd |
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3 * |
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4 * This program is free software; you can redistribute it and/or modify |
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5 * it under the terms of the GNU General Public License as published by |
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6 * the Free Software Foundation; version 2 of the License. |
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7 * |
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8 * This program is distributed in the hope that it will be useful, |
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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11 * GNU General Public License for more details. |
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12 * |
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13 * For information on how to redistribute this software under |
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14 * the terms of a license other than GNU General Public License |
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15 * contact TMate Software at support@hg4j.com |
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16 */ |
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17 package org.tmatesoft.hg.internal; |
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18 |
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19 import java.util.HashMap; |
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20 |
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21 /** |
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22 * Instance pooling. |
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23 * |
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24 * @author Artem Tikhomirov |
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25 * @author TMate Software Ltd. |
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26 */ |
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27 public class Pool<T> { |
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28 private final HashMap<T,T> unify = new HashMap<T, T>(); |
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29 |
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30 public T unify(T t) { |
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31 T rv = unify.get(t); |
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32 if (rv == null) { |
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33 // first time we see a new value |
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34 unify.put(t, t); |
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35 rv = t; |
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36 } |
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37 return rv; |
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38 } |
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39 |
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40 @Override |
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41 public String toString() { |
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42 StringBuilder sb = new StringBuilder(); |
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43 sb.append(Pool.class.getSimpleName()); |
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44 sb.append('<'); |
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45 if (!unify.isEmpty()) { |
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46 sb.append(unify.keySet().iterator().next().getClass().getName()); |
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47 } |
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48 sb.append('>'); |
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49 sb.append(':'); |
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50 sb.append(unify.size()); |
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51 return sb.toString(); |
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52 } |
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53 } |