зеркало из https://github.com/mozilla/pjs.git
148 строки
4.7 KiB
C++
148 строки
4.7 KiB
C++
/* ***** 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 a cache for services in a category.
|
|
*
|
|
* The Initial Developer of the Original Code is
|
|
* Christian Biesinger <cbiesinger@web.de>.
|
|
* Portions created by the Initial Developer are Copyright (C) 2005
|
|
* the Initial Developer. All Rights Reserved.
|
|
*
|
|
* Contributor(s):
|
|
*
|
|
* 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 nsCategoryCache_h_
|
|
#define nsCategoryCache_h_
|
|
|
|
#include "nsICategoryManager.h"
|
|
#include "nsIObserver.h"
|
|
#include "nsISimpleEnumerator.h"
|
|
#include "nsISupportsPrimitives.h"
|
|
|
|
#include "nsServiceManagerUtils.h"
|
|
|
|
#include "nsAutoPtr.h"
|
|
#include "nsCOMArray.h"
|
|
#include "nsDataHashtable.h"
|
|
|
|
#include "nsXPCOM.h"
|
|
|
|
class NS_NO_VTABLE nsCategoryListener {
|
|
protected:
|
|
// no virtual destructor (people shouldn't delete through an
|
|
// nsCategoryListener pointer)
|
|
~nsCategoryListener() {}
|
|
|
|
public:
|
|
virtual void EntryAdded(const nsCString& aValue) = 0;
|
|
virtual void EntryRemoved(const nsCString& aValue) = 0;
|
|
virtual void CategoryCleared() = 0;
|
|
};
|
|
|
|
class NS_COM_GLUE nsCategoryObserver : public nsIObserver {
|
|
public:
|
|
nsCategoryObserver(const char* aCategory,
|
|
nsCategoryListener* aCategoryListener);
|
|
~nsCategoryObserver();
|
|
|
|
void ListenerDied();
|
|
|
|
NS_DECL_ISUPPORTS
|
|
NS_DECL_NSIOBSERVER
|
|
private:
|
|
NS_HIDDEN_(void) RemoveObservers();
|
|
|
|
nsDataHashtable<nsCStringHashKey, nsCString> mHash;
|
|
nsCategoryListener* mListener;
|
|
nsCString mCategory;
|
|
bool mObserversRemoved;
|
|
};
|
|
|
|
/**
|
|
* This is a helper class that caches services that are registered in a certain
|
|
* category. The intended usage is that a service stores a variable of type
|
|
* nsCategoryCache<nsIFoo> in a member variable, where nsIFoo is the interface
|
|
* that these services should implement. The constructor of this class should
|
|
* then get the name of the category.
|
|
*/
|
|
template<class T>
|
|
class nsCategoryCache : protected nsCategoryListener {
|
|
public:
|
|
explicit nsCategoryCache(const char* aCategory);
|
|
~nsCategoryCache() { if (mObserver) mObserver->ListenerDied(); }
|
|
|
|
const nsCOMArray<T>& GetEntries() {
|
|
// Lazy initialization, so that services in this category can't
|
|
// cause reentrant getService (bug 386376)
|
|
if (!mObserver)
|
|
mObserver = new nsCategoryObserver(mCategoryName.get(), this);
|
|
return mEntries;
|
|
}
|
|
protected:
|
|
virtual void EntryAdded(const nsCString& aValue);
|
|
virtual void EntryRemoved(const nsCString& aValue);
|
|
virtual void CategoryCleared();
|
|
private:
|
|
friend class CategoryObserver;
|
|
|
|
// Not to be implemented
|
|
nsCategoryCache(const nsCategoryCache<T>&);
|
|
|
|
nsCString mCategoryName;
|
|
nsCOMArray<T> mEntries;
|
|
nsRefPtr<nsCategoryObserver> mObserver;
|
|
};
|
|
|
|
// -----------------------------------
|
|
// Implementation
|
|
|
|
template<class T>
|
|
nsCategoryCache<T>::nsCategoryCache(const char* aCategory)
|
|
: mCategoryName(aCategory)
|
|
{
|
|
}
|
|
|
|
template<class T>
|
|
void nsCategoryCache<T>::EntryAdded(const nsCString& aValue) {
|
|
nsCOMPtr<T> catEntry = do_GetService(aValue.get());
|
|
if (catEntry)
|
|
mEntries.AppendObject(catEntry);
|
|
}
|
|
|
|
template<class T>
|
|
void nsCategoryCache<T>::EntryRemoved(const nsCString& aValue) {
|
|
nsCOMPtr<T> catEntry = do_GetService(aValue.get());
|
|
if (catEntry)
|
|
mEntries.RemoveObject(catEntry);
|
|
}
|
|
|
|
template<class T>
|
|
void nsCategoryCache<T>::CategoryCleared() {
|
|
mEntries.Clear();
|
|
}
|
|
|
|
#endif
|