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annotate src/org/tmatesoft/hg/internal/IdentityPool.java @ 606:5daa42067e7c

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Avoid mmap files when only few bytes are to be read
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 07 May 2013 14:16:35 +0200
parents 12f668401613
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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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19 import org.tmatesoft.hg.util.Convertor;
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20 import org.tmatesoft.hg.util.DirectHashSet;
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23 /**
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24 *
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25 * @author Artem Tikhomirov
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26 * @author TMate Software Ltd.
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27 */
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28 public class IdentityPool<T> implements Convertor<T> {
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29 private final DirectHashSet<T> unify = new DirectHashSet<T>();
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31 public IdentityPool() {
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32 }
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34 public IdentityPool(int sizeHint) {
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35 }
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37 public T mangle(T t) {
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38 return unify(t);
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39 }
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41 public T unify(T t) {
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42 T rv = unify.get(t);
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43 if (rv == null) {
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44 // first time we see a new value
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45 unify.put(t);
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46 rv = t;
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47 }
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48 return rv;
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49 }
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51 public boolean contains(T t) {
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52 return unify.get(t) != null;
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53 }
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55 public void record(T t) {
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56 unify.put(t);
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57 }
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59 public void clear() {
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60 unify.clear();
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61 }
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63 public int size() {
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64 return unify.size();
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65 }
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67 @Override
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68 public String toString() {
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69 StringBuilder sb = new StringBuilder();
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70 sb.append(IdentityPool.class.getSimpleName());
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71 sb.append('@');
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72 sb.append(Integer.toString(System.identityHashCode(this)));
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73 sb.append(' ');
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74 sb.append(unify.toString());
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75 return sb.toString();
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76 }
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77 }