Mercurial > jhg
view src/org/tmatesoft/hg/internal/Pool.java @ 687:9859fcea475d
Towards ssh remote repositories: refactor HgRemoteRepository - move http related code to HttpConnector
author | Artem Tikhomirov <tikhomirov.artem@gmail.com> |
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date | Sat, 27 Jul 2013 18:34:14 +0200 (2013-07-27) |
parents | 12f668401613 |
children |
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/* * Copyright (c) 2011-2012 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 java.util.HashMap; import org.tmatesoft.hg.util.Convertor; /** * Instance pooling. * * @author Artem Tikhomirov * @author TMate Software Ltd. */ public class Pool<T> implements Convertor<T> { private final HashMap<T,T> unify; public Pool() { unify = new HashMap<T, T>(); } public Pool(int sizeHint) { if (sizeHint <= 0) { unify = new HashMap<T, T>(); } else { unify = new HashMap<T, T>(sizeHint * 4 / 3, 0.75f); } } 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, t); rv = t; } return rv; } public boolean contains(T t) { return unify.containsKey(t); } public void record(T t) { unify.put(t, t); } public void clear() { unify.clear(); } public int size() { return unify.size(); } @Override public String toString() { StringBuilder sb = new StringBuilder(); sb.append(Pool.class.getSimpleName()); sb.append('<'); if (!unify.isEmpty()) { sb.append(unify.keySet().iterator().next().getClass().getName()); } sb.append('>'); sb.append(':'); sb.append(unify.size()); return sb.toString(); } }