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// Copyright (c) 2009 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_FRAME_NS_ISUPPORTS_IMPL_H_
#define CHROME_FRAME_NS_ISUPPORTS_IMPL_H_
#include "base/basictypes.h"
#include "base/logging.h"
#include "base/platform_thread.h"
#include "chrome_frame/utils.h"
#include "third_party/xulrunner-sdk/win/include/xpcom/nscore.h"
#include "third_party/xulrunner-sdk/win/include/xpcom/nsid.h"
#include "third_party/xulrunner-sdk/win/include/xpcom/nsISupportsBase.h"
// A simple single-threaded implementation of methods needed to support
// nsISupports. Must be inherited by classes that also inherit from nsISupports.
template<class Derived>
class NsISupportsImplBase {
public:
NsISupportsImplBase() : nsiimpl_ref_count_(0) {
nsiimpl_thread_id_ = PlatformThread::CurrentId();
}
virtual ~NsISupportsImplBase() {
DCHECK(nsiimpl_thread_id_ == PlatformThread::CurrentId());
}
NS_IMETHOD QueryInterface(REFNSIID iid, void** ptr) {
DCHECK(nsiimpl_thread_id_ == PlatformThread::CurrentId());
nsresult res = NS_NOINTERFACE;
if (memcmp(&iid, &__uuidof(nsISupports), sizeof(nsIID)) == 0) {
*ptr = static_cast<nsISupports*>(static_cast<typename Derived*>(this));
AddRef();
res = NS_OK;
}
return res;
}
NS_IMETHOD_(nsrefcnt) AddRef() {
DCHECK(nsiimpl_thread_id_ == PlatformThread::CurrentId());
nsiimpl_ref_count_++;
return nsiimpl_ref_count_;
}
NS_IMETHOD_(nsrefcnt) Release() {
DCHECK(nsiimpl_thread_id_ == PlatformThread::CurrentId());
nsiimpl_ref_count_--;
if (!nsiimpl_ref_count_) {
Derived* me = static_cast<Derived*>(this);
delete me;
return 0;
}
return nsiimpl_ref_count_;
}
protected:
nsrefcnt nsiimpl_ref_count_;
AddRefModule nsiimpl_module_ref_;
// used to DCHECK on expected single-threaded usage
uint64 nsiimpl_thread_id_;
};
#endif // CHROME_FRAME_NS_ISUPPORTS_IMPL_H_
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