- /*
- * @(#)CodeSetCache.java 1.8 04/03/01
- *
- * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
- * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
- */
- 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;
- }
- }