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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#ifndef nsUnicodeFallbackCache_h__
#define nsUnicodeFallbackCache_h__
#include "prtypes.h"
#include "plhash.h"
#include <Script.h>
#include "nsDebug.h"
#include "nscore.h"

class nsUnicodeFallbackCache
{
public:
	nsUnicodeFallbackCache() 
	{
		mTable = PL_NewHashTable(8, (PLHashFunction)HashKey, 
								(PLHashComparator)CompareKeys, 
								(PLHashComparator)CompareValues,
								nsnull, nsnull);
		mCount = 0;
	};
	~nsUnicodeFallbackCache() 
	{
		if (mTable)
		{
			PL_HashTableEnumerateEntries(mTable, FreeHashEntries, 0);
			PL_HashTableDestroy(mTable);
			mTable = nsnull;
		}
	};

	inline PRBool	Get(PRUnichar aChar, ScriptCode& oScript) 
	{
		ScriptCode ret = (ScriptCode) 
		    NS_PTR_TO_INT32(PL_HashTableLookup(mTable, (void*)aChar));
		oScript = 0x00FF & ret ;
		return 0x00 != (0xFF00 & ret);
	};
	
	inline void	Set(PRUnichar aChar, ScriptCode aScript) 
	{
		PL_HashTableAdd(mTable,(void*) aChar, (void*)(aScript | 0xFF00));
		mCount ++;
	};

	inline static nsUnicodeFallbackCache* GetSingleton() 
	{
			if(! gSingleton)
				gSingleton = new nsUnicodeFallbackCache();
			return gSingleton;
	}
private:
	inline static PR_CALLBACK PLHashNumber HashKey(const void *aKey) 
	{
		return (PRUnichar) NS_PTR_TO_INT32(aKey);
	};
	
	inline static PR_CALLBACK PRIntn		CompareKeys(const void *v1, const void *v2) 
	{
		return  (((PRUnichar ) NS_PTR_TO_INT32(v1)) == 
		    ((PRUnichar ) NS_PTR_TO_INT32(v2)));
	};
	
	inline static PR_CALLBACK PRIntn		CompareValues(const void *v1, const void *v2) 
	{
		return (((ScriptCode) NS_PTR_TO_INT32(v1)) == 
		    ((ScriptCode) NS_PTR_TO_INT32(v2)));
	};
	inline static PR_CALLBACK PRIntn		FreeHashEntries(PLHashEntry *he, PRIntn italic, void *arg) 
	{
		return HT_ENUMERATE_REMOVE;
	};

	struct PLHashTable*		mTable;
	PRUint32				mCount;

	static nsUnicodeFallbackCache* gSingleton;
};
#endif nsUnicodeFallbackCache_h__