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lightning-sunbird  0.9+nobinonly
nsClusterKeySet.cpp
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00001 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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 Communicator client 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  *   Chris Waterson <waterson@netscape.com>
00024  *
00025  * Alternatively, the contents of this file may be used under the terms of
00026  * either of the GNU General Public License Version 2 or later (the "GPL"),
00027  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00028  * in which case the provisions of the GPL or the LGPL are applicable instead
00029  * of those above. If you wish to allow use of your version of this file only
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00036  *
00037  * ***** END LICENSE BLOCK ***** */
00038 
00039 #include "nsClusterKeySet.h"
00040 
00041 PLHashAllocOps nsClusterKeySet::gAllocOps = {
00042     AllocTable, FreeTable, AllocEntry, FreeEntry };
00043 
00044 
00045 nsClusterKeySet::nsClusterKeySet()
00046     : mTable(nsnull)
00047 {
00048     mHead.mPrev = mHead.mNext = &mHead;
00049 
00050     static const size_t kBucketSizes[] = { sizeof(Entry) };
00051     static const PRInt32 kNumBuckets = sizeof(kBucketSizes) / sizeof(size_t);
00052     static const PRInt32 kInitialEntries = 8;
00053 
00054     // Per news://news.mozilla.org/39BEC105.5090206%40netscape.com
00055     static const PRInt32 kInitialPoolSize = 256;
00056 
00057     mPool.Init("nsClusterKeySet", kBucketSizes, kNumBuckets, kInitialPoolSize);
00058 
00059     mTable = PL_NewHashTable(kInitialEntries,
00060                              nsClusterKey::HashClusterKey,
00061                              nsClusterKey::CompareClusterKeys,
00062                              PL_CompareValues, &gAllocOps, &mPool);
00063 
00064     MOZ_COUNT_CTOR(nsClusterKeySet);
00065 }
00066 
00067 
00068 nsClusterKeySet::~nsClusterKeySet()
00069 {
00070     PL_HashTableDestroy(mTable);
00071     MOZ_COUNT_DTOR(nsClusterKeySet);
00072 }
00073 
00074 PRBool
00075 nsClusterKeySet::Contains(const nsClusterKey& aKey)
00076 {
00077     return nsnull != PL_HashTableLookup(mTable, &aKey);
00078 }
00079 
00080 nsresult
00081 nsClusterKeySet::Add(const nsClusterKey& aKey)
00082 {
00083     PLHashNumber hash = aKey.Hash();
00084     PLHashEntry** hep = PL_HashTableRawLookup(mTable, hash, &aKey);
00085 
00086     if (hep && *hep)
00087         return NS_OK; // already had it.
00088 
00089     PLHashEntry* he = PL_HashTableRawAdd(mTable, hep, hash, &aKey, nsnull);
00090     if (! he)
00091         return NS_ERROR_OUT_OF_MEMORY;
00092 
00093     Entry* entry = NS_REINTERPRET_CAST(Entry*, he);
00094 
00095     // XXX yes, I am evil. Fixup the key in the hashentry to point to
00096     // the value it contains, rather than the one on the stack.
00097     entry->mHashEntry.key = &entry->mKey;
00098 
00099     // thread
00100     mHead.mPrev->mNext = entry;
00101     entry->mPrev = mHead.mPrev;
00102     entry->mNext = &mHead;
00103     mHead.mPrev = entry;
00104     
00105     return NS_OK;
00106 }