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nsUnicodeFallbackCache.h
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00001 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
00002 /* ***** BEGIN LICENSE BLOCK *****
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00010  * Software distributed under the License is distributed on an "AS IS" basis,
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00014  *
00015  * The Original Code is mozilla.org code.
00016  *
00017  * The Initial Developer of the Original Code is
00018  * Netscape Communications Corporation.
00019  * Portions created by the Initial Developer are Copyright (C) 1998
00020  * the Initial Developer. All Rights Reserved.
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00022  * Contributor(s):
00023  *
00024  * Alternatively, the contents of this file may be used under the terms of
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00037 
00038 #ifndef nsUnicodeFallbackCache_h__
00039 #define nsUnicodeFallbackCache_h__
00040 #include "prtypes.h"
00041 #include "plhash.h"
00042 #include <Script.h>
00043 #include "nsDebug.h"
00044 #include "nscore.h"
00045 
00046 class nsUnicodeFallbackCache
00047 {
00048 public:
00049        nsUnicodeFallbackCache() 
00050        {
00051               mTable = PL_NewHashTable(8, (PLHashFunction)HashKey, 
00052                                                         (PLHashComparator)CompareKeys, 
00053                                                         (PLHashComparator)CompareValues,
00054                                                         nsnull, nsnull);
00055               mCount = 0;
00056        };
00057        ~nsUnicodeFallbackCache() 
00058        {
00059               if (mTable)
00060               {
00061                      PL_HashTableEnumerateEntries(mTable, FreeHashEntries, 0);
00062                      PL_HashTableDestroy(mTable);
00063                      mTable = nsnull;
00064               }
00065        };
00066 
00067        inline PRBool Get(PRUnichar aChar, ScriptCode& oScript) 
00068        {
00069               ScriptCode ret = (ScriptCode) 
00070                   NS_PTR_TO_INT32(PL_HashTableLookup(mTable, (void*)aChar));
00071               oScript = 0x00FF & ret ;
00072               return 0x00 != (0xFF00 & ret);
00073        };
00074        
00075        inline void   Set(PRUnichar aChar, ScriptCode aScript) 
00076        {
00077               PL_HashTableAdd(mTable,(void*) aChar, (void*)(aScript | 0xFF00));
00078               mCount ++;
00079        };
00080 
00081        inline static nsUnicodeFallbackCache* GetSingleton() 
00082        {
00083                      if(! gSingleton)
00084                             gSingleton = new nsUnicodeFallbackCache();
00085                      return gSingleton;
00086        }
00087 private:
00088        inline static PR_CALLBACK PLHashNumber HashKey(const void *aKey) 
00089        {
00090               return (PRUnichar) NS_PTR_TO_INT32(aKey);
00091        };
00092        
00093        inline static PR_CALLBACK PRIntn          CompareKeys(const void *v1, const void *v2) 
00094        {
00095               return  (((PRUnichar ) NS_PTR_TO_INT32(v1)) == 
00096                   ((PRUnichar ) NS_PTR_TO_INT32(v2)));
00097        };
00098        
00099        inline static PR_CALLBACK PRIntn          CompareValues(const void *v1, const void *v2) 
00100        {
00101               return (((ScriptCode) NS_PTR_TO_INT32(v1)) == 
00102                   ((ScriptCode) NS_PTR_TO_INT32(v2)));
00103        };
00104        inline static PR_CALLBACK PRIntn          FreeHashEntries(PLHashEntry *he, PRIntn italic, void *arg) 
00105        {
00106               return HT_ENUMERATE_REMOVE;
00107        };
00108 
00109        struct PLHashTable*         mTable;
00110        PRUint32                           mCount;
00111 
00112        static nsUnicodeFallbackCache* gSingleton;
00113 };
00114 #endif nsUnicodeFallbackCache_h__