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annotate src/org/tmatesoft/hg/internal/Pool.java @ 599:55b7987c1796

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Do not instantiate intermediate arrays
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 03 May 2013 15:29:26 +0200
parents 12f668401613
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1 /*
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2 * Copyright (c) 2011-2012 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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19 import java.util.HashMap;
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21 import org.tmatesoft.hg.util.Convertor;
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23 /**
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24 * Instance pooling.
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25 *
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26 * @author Artem Tikhomirov
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27 * @author TMate Software Ltd.
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28 */
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29 public class Pool<T> implements Convertor<T> {
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30 private final HashMap<T,T> unify;
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32 public Pool() {
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33 unify = new HashMap<T, T>();
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34 }
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36 public Pool(int sizeHint) {
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37 if (sizeHint <= 0) {
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38 unify = new HashMap<T, T>();
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39 } else {
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40 unify = new HashMap<T, T>(sizeHint * 4 / 3, 0.75f);
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41 }
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42 }
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44 public T mangle(T t) {
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45 return unify(t);
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46 }
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48 public T unify(T t) {
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49 T rv = unify.get(t);
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50 if (rv == null) {
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51 // first time we see a new value
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52 unify.put(t, t);
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53 rv = t;
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54 }
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55 return rv;
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56 }
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57
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58 public boolean contains(T t) {
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59 return unify.containsKey(t);
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60 }
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62 public void record(T t) {
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63 unify.put(t, t);
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64 }
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66 public void clear() {
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67 unify.clear();
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68 }
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70 public int size() {
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71 return unify.size();
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72 }
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74 @Override
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75 public String toString() {
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76 StringBuilder sb = new StringBuilder();
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77 sb.append(Pool.class.getSimpleName());
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78 sb.append('<');
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79 if (!unify.isEmpty()) {
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80 sb.append(unify.keySet().iterator().next().getClass().getName());
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81 }
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82 sb.append('>');
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83 sb.append(':');
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84 sb.append(unify.size());
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85 return sb.toString();
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86 }
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87 }