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// Copyright 2014 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 MOJO_BINDINGS_JS_HANDLE_H_
#define MOJO_BINDINGS_JS_HANDLE_H_
#include "gin/converter.h"
#include "gin/handle.h"
#include "gin/wrappable.h"
#include "mojo/public/cpp/system/core.h"
namespace gin {
// Wrapper for mojo Handles exposed to JavaScript. This ensures the Handle
// is Closed when its JS object is garbage collected.
class HandleWrapper : public gin::Wrappable<HandleWrapper> {
public:
static gin::WrapperInfo kWrapperInfo;
static gin::Handle<HandleWrapper> Create(v8::Isolate* isolate,
MojoHandle handle) {
return gin::CreateHandle(isolate, new HandleWrapper(handle));
}
mojo::Handle get() const { return handle_.get(); }
mojo::Handle release() { return handle_.release(); }
void Close() { handle_.reset(); }
protected:
HandleWrapper(MojoHandle handle);
virtual ~HandleWrapper();
mojo::ScopedHandle handle_;
};
// Note: It's important to use this converter rather than the one for
// MojoHandle, since that will do a simple int32 conversion. It's unfortunate
// there's no way to prevent against accidental use.
// TODO(mpcomplete): define converters for all Handle subtypes.
template<>
struct Converter<mojo::Handle> {
static v8::Handle<v8::Value> ToV8(v8::Isolate* isolate,
const mojo::Handle& val);
static bool FromV8(v8::Isolate* isolate, v8::Handle<v8::Value> val,
mojo::Handle* out);
};
// We need to specialize the normal gin::Handle converter in order to handle
// converting |null| to a wrapper for an empty mojo::Handle.
template<>
struct Converter<gin::Handle<gin::HandleWrapper> > {
static v8::Handle<v8::Value> ToV8(
v8::Isolate* isolate, const gin::Handle<gin::HandleWrapper>& val) {
return val.ToV8();
}
static bool FromV8(v8::Isolate* isolate, v8::Handle<v8::Value> val,
gin::Handle<gin::HandleWrapper>* out) {
if (val->IsNull()) {
*out = HandleWrapper::Create(isolate, MOJO_HANDLE_INVALID);
return true;
}
gin::HandleWrapper* object = NULL;
if (!Converter<gin::HandleWrapper*>::FromV8(isolate, val, &object)) {
return false;
}
*out = gin::Handle<gin::HandleWrapper>(val, object);
return true;
}
};
} // namespace gin
#endif // MOJO_BINDINGS_JS_HANDLE_H_
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