Mercurial > jhg
view src/org/tmatesoft/hg/internal/IdentityPool.java @ 508:ca5202afea90
Support follow history option when walking file history tree
author | Artem Tikhomirov <tikhomirov.artem@gmail.com> |
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date | Wed, 12 Dec 2012 20:52:10 +0100 |
parents | 12f668401613 |
children |
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/* * Copyright (c) 2011 TMate Software Ltd * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; version 2 of the License. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * For information on how to redistribute this software under * the terms of a license other than GNU General Public License * contact TMate Software at support@hg4j.com */ package org.tmatesoft.hg.internal; import org.tmatesoft.hg.util.Convertor; import org.tmatesoft.hg.util.DirectHashSet; /** * * @author Artem Tikhomirov * @author TMate Software Ltd. */ public class IdentityPool<T> implements Convertor<T> { private final DirectHashSet<T> unify = new DirectHashSet<T>(); public IdentityPool() { } public IdentityPool(int sizeHint) { } public T mangle(T t) { return unify(t); } public T unify(T t) { T rv = unify.get(t); if (rv == null) { // first time we see a new value unify.put(t); rv = t; } return rv; } public boolean contains(T t) { return unify.get(t) != null; } public void record(T t) { unify.put(t); } public void clear() { unify.clear(); } public int size() { return unify.size(); } @Override public String toString() { StringBuilder sb = new StringBuilder(); sb.append(IdentityPool.class.getSimpleName()); sb.append('@'); sb.append(Integer.toString(System.identityHashCode(this))); sb.append(' '); sb.append(unify.toString()); return sb.toString(); } }