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122 lines
3.9 KiB
C++
122 lines
3.9 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef nsAtomTable_h__
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#define nsAtomTable_h__
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#include "nsIAtom.h"
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#include "nsStringBuffer.h"
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/**
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* Note that AtomImpl objects are sometimes converted into PermanentAtomImpl
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* objects using placement new and just overwriting the vtable pointer.
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*/
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class AtomImpl : public nsIAtom {
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public:
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AtomImpl(const nsAString& aString);
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// This is currently only used during startup when creating a permanent atom
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// from NS_RegisterStaticAtoms
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AtomImpl(nsStringBuffer* aData, PRUint32 aLength);
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protected:
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// This is only intended to be used when a normal atom is turned into a
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// permanent one.
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AtomImpl() {
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// We can't really assert that mString is a valid nsStringBuffer string,
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// so do the best we can do and check for some consistencies.
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NS_ASSERTION((mLength + 1) * sizeof(PRUnichar) <=
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nsStringBuffer::FromData(mString)->StorageSize() &&
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mString[mLength] == 0,
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"Not initialized atom");
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}
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// We don't need a virtual destructor here because PermanentAtomImpl
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// deletions aren't handled through Release().
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~AtomImpl();
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public:
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NS_DECL_ISUPPORTS
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NS_DECL_NSIATOM
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enum { REFCNT_PERMANENT_SENTINEL = PR_UINT32_MAX };
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virtual bool IsPermanent();
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// We can't use the virtual function in the base class destructor.
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bool IsPermanentInDestructor() {
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return mRefCnt == REFCNT_PERMANENT_SENTINEL;
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}
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// for |#ifdef NS_BUILD_REFCNT_LOGGING| access to reference count
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nsrefcnt GetRefCount() { return mRefCnt; }
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};
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/**
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* A non-refcounted implementation of nsIAtom.
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*/
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class PermanentAtomImpl : public AtomImpl {
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public:
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PermanentAtomImpl(const nsAString& aString)
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: AtomImpl(aString)
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{}
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PermanentAtomImpl(nsStringBuffer* aData, PRUint32 aLength)
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: AtomImpl(aData, aLength)
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{}
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PermanentAtomImpl()
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{}
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~PermanentAtomImpl();
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NS_IMETHOD_(nsrefcnt) AddRef();
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NS_IMETHOD_(nsrefcnt) Release();
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virtual bool IsPermanent();
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void* operator new(size_t size, AtomImpl* aAtom) CPP_THROW_NEW;
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void* operator new(size_t size) CPP_THROW_NEW
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{
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return ::operator new(size);
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}
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};
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void NS_PurgeAtomTable();
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#endif // nsAtomTable_h__
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