/*
* Copyright (C) 2013 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef CallbackPromiseAdapter_h
#define CallbackPromiseAdapter_h
#include "bindings/v8/DOMRequestState.h"
#include "bindings/v8/ScriptPromiseResolver.h"
#include "public/platform/WebCallbacks.h"
namespace WebCore {
// This class provides an easy way to convert from a Script-exposed
// class (i.e. a class that has a toV8() overload) that uses Promises
// to a WebKit API class that uses WebCallbacks. You can define
// seperate Success and Error classes, but this example just uses one
// object for both.
//
// To use:
//
// class MyClass ... {
// typedef blink::WebMyClass WebType;
// static PassRefPtr<MyClass> from(blink::WebMyClass* webInstance) {
// // convert/create as appropriate, but often it's just:
// return MyClass::create(adoptPtr(webInstance));
// }
//
// Now when calling into a WebKit API that requires a WebCallbacks<blink::WebMyClass, blink::WebMyClass>*:
//
// // call signature: callSomeMethod(WebCallbacks<MyClass, MyClass>* callbacks)
// webObject->callSomeMethod(new CallbackPromiseAdapter<MyClass, MyClass>(resolver, scriptExecutionContext));
//
// Note that this class does not manage its own lifetime. In this
// example that ownership of the WebCallbacks instance is being passed
// in and it is up to the callee to free the WebCallbacks instace.
template<typename S, typename T>
class CallbackPromiseAdapter FINAL : public blink::WebCallbacks<typename S::WebType, typename T::WebType> {
public:
explicit CallbackPromiseAdapter(PassRefPtr<ScriptPromiseResolver> resolver, ExecutionContext* context)
: m_resolver(resolver)
, m_requestState(context)
{
}
virtual ~CallbackPromiseAdapter() { }
virtual void onSuccess(typename S::WebType* result) OVERRIDE
{
DOMRequestState::Scope scope(m_requestState);
m_resolver->resolve(S::from(result));
}
virtual void onError(typename T::WebType* error) OVERRIDE
{
DOMRequestState::Scope scope(m_requestState);
m_resolver->reject(T::from(error));
}
private:
RefPtr<ScriptPromiseResolver> m_resolver;
DOMRequestState m_requestState;
WTF_MAKE_NONCOPYABLE(CallbackPromiseAdapter);
};
} // namespace WebCore
#endif