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| -rw-r--r-- | src/libs/xpcom18a4/xpcom/ds/nsRefPtrHashtable.h | 197 |
1 files changed, 197 insertions, 0 deletions
diff --git a/src/libs/xpcom18a4/xpcom/ds/nsRefPtrHashtable.h b/src/libs/xpcom18a4/xpcom/ds/nsRefPtrHashtable.h new file mode 100644 index 00000000..69cdbe88 --- /dev/null +++ b/src/libs/xpcom18a4/xpcom/ds/nsRefPtrHashtable.h @@ -0,0 +1,197 @@ +/* -*- 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 C++ hashtable templates. + * + * The Initial Developer of the Original Code is + * Benjamin Smedberg. + * Portions created by the Initial Developer are Copyright (C) 2002 + * the Initial Developer. All Rights Reserved. + * + * Contributor(s): + * Neil Rashbrook <neil@parkwaycc.co.uk> + * + * Alternatively, the contents of this file may be used under the terms of + * either 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 nsRefPtrHashtable_h__ +#define nsRefPtrHashtable_h__ + +#include "nsBaseHashtable.h" +#include "nsHashKeys.h" +#include "nsAutoPtr.h" + +/** + * templated hashtable class maps keys to reference pointers. + * See nsBaseHashtable for complete declaration. + * @param KeyClass a wrapper-class for the hashtable key, see nsHashKeys.h + * for a complete specification. + * @param RefPtr the reference-type being wrapped + * @see nsDataHashtable, nsClassHashtable + */ +template<class KeyClass, class RefPtr> +class nsRefPtrHashtable : + public nsBaseHashtable< KeyClass, nsRefPtr<RefPtr> , RefPtr* > +{ +public: + typedef typename KeyClass::KeyType KeyType; + typedef RefPtr* UserDataType; + + /** + * @copydoc nsBaseHashtable::Get + * @param pData This is an XPCOM getter, so pData is already_addrefed. + * If the key doesn't exist, pData will be set to nsnull. + */ + PRBool Get(KeyType aKey, UserDataType* pData) const; + + /** + * Gets a weak reference to the hashtable entry. + * @param aFound If not nsnull, will be set to PR_TRUE if the entry is found, + * to PR_FALSE otherwise. + * @return The entry, or nsnull if not found. Do not release this pointer! + */ + RefPtr* GetWeak(KeyType aKey, PRBool* aFound = nsnull) const; +}; + +/** + * Thread-safe version of nsRefPtrHashtable + * @param KeyClass a wrapper-class for the hashtable key, see nsHashKeys.h + * for a complete specification. + * @param RefPtr the reference-type being wrapped + */ +template<class KeyClass, class RefPtr> +class nsRefPtrHashtableMT : + public nsBaseHashtableMT< KeyClass, nsRefPtr<RefPtr> , RefPtr* > +{ +public: + typedef typename KeyClass::KeyType KeyType; + typedef RefPtr* UserDataType; + + /** + * @copydoc nsBaseHashtable::Get + * @param pData This is an XPCOM getter, so pData is already_addrefed. + * If the key doesn't exist, pData will be set to nsnull. + */ + PRBool Get(KeyType aKey, UserDataType* pData) const; + + // GetWeak does not make sense on a multi-threaded hashtable, where another + // thread may remove the entry (and hence release it) as soon as GetWeak + // returns +}; + + +// +// nsRefPtrHashtable definitions +// + +template<class KeyClass, class RefPtr> +PRBool +nsRefPtrHashtable<KeyClass,RefPtr>::Get + (KeyType aKey, UserDataType* pRefPtr) const +{ + typename nsBaseHashtable<KeyClass, nsRefPtr<RefPtr>, RefPtr*>::EntryType* ent = + this->GetEntry(aKey); + + if (ent) + { + if (pRefPtr) + { + *pRefPtr = ent->mData; + + NS_IF_ADDREF(*pRefPtr); + } + + return PR_TRUE; + } + + // if the key doesn't exist, set *pRefPtr to null + // so that it is a valid XPCOM getter + if (pRefPtr) + *pRefPtr = nsnull; + + return PR_FALSE; +} + +template<class KeyClass, class RefPtr> +RefPtr* +nsRefPtrHashtable<KeyClass,RefPtr>::GetWeak + (KeyType aKey, PRBool* aFound) const +{ + typename nsBaseHashtable<KeyClass, nsRefPtr<RefPtr>, RefPtr*>::EntryType* ent = + this->GetEntry(aKey); + + if (ent) + { + if (aFound) + *aFound = PR_TRUE; + + return ent->mData; + } + + // Key does not exist, return nsnull and set aFound to PR_FALSE + if (aFound) + *aFound = PR_FALSE; + return nsnull; +} + +// +// nsRefPtrHashtableMT definitions +// + +template<class KeyClass, class RefPtr> +PRBool +nsRefPtrHashtableMT<KeyClass,RefPtr>::Get + (KeyType aKey, UserDataType* pRefPtr) const +{ + PR_Lock(this->mLock); + + typename nsBaseHashtableMT<KeyClass, nsRefPtr<RefPtr>, RefPtr*>::EntryType* ent = + this->GetEntry(aKey); + + if (ent) + { + if (pRefPtr) + { + *pRefPtr = ent->mData; + + NS_IF_ADDREF(*pRefPtr); + } + + PR_Unlock(this->mLock); + + return PR_TRUE; + } + + // if the key doesn't exist, set *pRefPtr to null + // so that it is a valid XPCOM getter + if (pRefPtr) + *pRefPtr = nsnull; + + PR_Unlock(this->mLock); + + return PR_FALSE; +} + +#endif // nsRefPtrHashtable_h__ |