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nsUnicodeFontMappingCache.h
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00001 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
00002 /* ***** BEGIN LICENSE BLOCK *****
00003  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00004  *
00005  * The contents of this file are subject to the Mozilla Public License Version
00006  * 1.1 (the "License"); you may not use this file except in compliance with
00007  * the License. You may obtain a copy of the License at
00008  * http://www.mozilla.org/MPL/
00009  *
00010  * Software distributed under the License is distributed on an "AS IS" basis,
00011  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00012  * for the specific language governing rights and limitations under the
00013  * License.
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.
00021  *
00022  * Contributor(s):
00023  *
00024  * Alternatively, the contents of this file may be used under the terms of
00025  * either of the GNU General Public License Version 2 or later (the "GPL"),
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00027  * in which case the provisions of the GPL or the LGPL are applicable instead
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00036  * ***** END LICENSE BLOCK ***** */
00037 #ifndef nsUnicodeFontMappingCache_h__
00038 #define nsUnicodeFontMappingCache_h__
00039 #include "plhash.h"
00040 #include "nsCRT.h"
00041 #include "nsString.h"
00042 #include "nsUnicodeFontMappingMac.h"
00043 
00044 class nsUnicodeFontMappingCache
00045 {
00046 public:
00047        nsUnicodeFontMappingCache() 
00048        {
00049               mTable = PL_NewHashTable(8, (PLHashFunction)HashKey, 
00050                                                                (PLHashComparator)CompareKeys, 
00051                                                                (PLHashComparator)CompareValues,
00052                                                                nsnull, nsnull);
00053               mCount = 0;   
00054        };
00055        ~nsUnicodeFontMappingCache() 
00056        {
00057               if (mTable)
00058               {
00059                      PL_HashTableEnumerateEntries(mTable, FreeHashEntries, 0);
00060                      PL_HashTableDestroy(mTable);
00061                      mTable = nsnull;
00062               }
00063        };
00064 
00065        inline PRBool Get(const nsString& key, nsUnicodeFontMappingMac **item)
00066        {
00067               *item = (nsUnicodeFontMappingMac*)PL_HashTableLookup(mTable, &key);
00068               return nsnull != (*item);
00069        };
00070        inline void   Set(const nsString& key, nsUnicodeFontMappingMac *item)
00071        {
00072               nsString *newKey = new nsString(key);
00073               if (newKey)
00074               {
00075                      PL_HashTableAdd(mTable, newKey, item);
00076                      mCount ++;
00077               }
00078        };
00079 
00080 private:
00081        inline static PR_CALLBACK PLHashNumber HashKey(const void *aKey)
00082        {
00083     nsString* key = (nsString*)aKey;
00084               return nsCRT::HashCode(key->get());
00085        };
00086        inline static PR_CALLBACK PRIntn          CompareKeys(const void *v1, const void *v2)
00087        {
00088               return ((nsString *)v1) -> Equals(* ((nsString *)v2));
00089        };
00090        inline static PR_CALLBACK PRIntn          CompareValues(const void *v1, const void *v2)
00091        {
00092               return ((nsUnicodeFontMappingMac*)v1) -> Equals(* ((nsUnicodeFontMappingMac*)v2));
00093        };
00094        inline static PR_CALLBACK PRIntn          FreeHashEntries(PLHashEntry *he, PRIntn italic, void *arg)
00095        {
00096               delete (nsString*)he->key;
00097               delete (nsUnicodeFontMappingMac*)he->value;
00098               return HT_ENUMERATE_REMOVE;
00099        };
00100 
00101        struct PLHashTable*         mTable;
00102        PRUint32                           mCount;
00103 };
00104 
00105 #endif /* nsUnicodeFontMappingCache_h__ */