| /* |
| * Copyright (c) 2001, 2004, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code 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 |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| package com.sun.corba.se.impl.encoding; |
| |
| import java.nio.charset.CharsetDecoder; |
| import java.nio.charset.CharsetEncoder; |
| import java.util.Map; |
| import java.util.WeakHashMap; |
| |
| /** |
| * Thread local cache of sun.io code set converters for performance. |
| * |
| * The thread local class contains a single reference to a Map[] |
| * containing two WeakHashMaps. One for CharsetEncoders and |
| * one for CharsetDecoders. Constants are defined for indexing. |
| * |
| * This is used internally by CodeSetConversion. |
| */ |
| class CodeSetCache |
| { |
| /** |
| * The ThreadLocal data is a 2 element Map array indexed |
| * by BTC_CACHE_MAP and CTB_CACHE_MAP. |
| */ |
| private ThreadLocal converterCaches = new ThreadLocal() { |
| public java.lang.Object initialValue() { |
| return new Map[] { new WeakHashMap(), new WeakHashMap() }; |
| } |
| }; |
| |
| /** |
| * Index in the thread local converterCaches array for |
| * the byte to char converter Map. A key is the Java |
| * name corresponding to the desired code set. |
| */ |
| private static final int BTC_CACHE_MAP = 0; |
| |
| /** |
| * Index in the thread local converterCaches array for |
| * the char to byte converter Map. A key is the Java |
| * name corresponding to the desired code set. |
| */ |
| private static final int CTB_CACHE_MAP = 1; |
| |
| /** |
| * Retrieve a CharsetDecoder from the Map using the given key. |
| */ |
| CharsetDecoder getByteToCharConverter(Object key) { |
| Map btcMap = ((Map[])converterCaches.get())[BTC_CACHE_MAP]; |
| |
| return (CharsetDecoder)btcMap.get(key); |
| } |
| |
| /** |
| * Retrieve a CharsetEncoder from the Map using the given key. |
| */ |
| CharsetEncoder getCharToByteConverter(Object key) { |
| Map ctbMap = ((Map[])converterCaches.get())[CTB_CACHE_MAP]; |
| |
| return (CharsetEncoder)ctbMap.get(key); |
| } |
| |
| /** |
| * Stores the given CharsetDecoder in the thread local cache, |
| * and returns the same converter. |
| */ |
| CharsetDecoder setConverter(Object key, CharsetDecoder converter) { |
| Map btcMap = ((Map[])converterCaches.get())[BTC_CACHE_MAP]; |
| |
| btcMap.put(key, converter); |
| |
| return converter; |
| } |
| |
| /** |
| * Stores the given CharsetEncoder in the thread local cache, |
| * and returns the same converter. |
| */ |
| CharsetEncoder setConverter(Object key, CharsetEncoder converter) { |
| |
| Map ctbMap = ((Map[])converterCaches.get())[CTB_CACHE_MAP]; |
| |
| ctbMap.put(key, converter); |
| |
| return converter; |
| } |
| } |