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annotate src/org/tmatesoft/hg/internal/Pool.java @ 215:41a778e3fd31

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Issue 5: Facilities for progress and cancellation. More specific exceptions. Exceptions from callbacks as RuntimeException
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 17 May 2011 00:56:54 +0200
parents e2115da4cf6a
children 3dcd3dd90c77
rev   line source
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
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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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Artem Tikhomirov <tikhomirov.artem@gmail.com>
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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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19 import java.util.HashMap;
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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 }
195
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53 }