/*
* 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
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*/
package org.jboss.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.
*/
@SuppressWarnings({"rawtypes", "unchecked"})
class CodeSetCache
{
/**
* The ThreadLocal data is a 2 element Map array indexed by BTC_CACHE_MAP and CTB_CACHE_MAP.
*/
private ThreadLocal<Object> converterCaches = new ThreadLocal<Object>()
{
public Object initialValue()
{
return new Map[]{new WeakHashMap<Object, Object>(), new WeakHashMap<Object, Object>()};
}
};
/**
* 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;
}
}