146 lines
3.6 KiB
C++
146 lines
3.6 KiB
C++
// Copyright 2014 Cheng Zhao. All rights reserved.
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// Use of this source code is governed by MIT license that can be found in the
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// LICENSE file.
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#ifndef NATIVE_MATE_SCOPED_PERSISTENT_H_
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#define NATIVE_MATE_SCOPED_PERSISTENT_H_
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#include "base/memory/ref_counted.h"
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#include "native_mate/converter.h"
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#include "v8/include/v8.h"
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namespace mate {
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// A v8::Persistent handle to a V8 value which destroys and clears the
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// underlying handle on destruction.
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template <typename T>
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class ScopedPersistent {
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public:
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ScopedPersistent(v8::Isolate* isolate = NULL) : isolate_(isolate) {
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}
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ScopedPersistent(v8::Handle<v8::Value> handle, v8::Isolate* isolate = NULL)
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: isolate_(isolate) {
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reset(v8::Handle<T>::Cast(handle));
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}
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~ScopedPersistent() {
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reset();
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}
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void reset(v8::Handle<T> handle) {
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reset(GetIsolate(handle), handle);
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}
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void reset(v8::Isolate* isolate, v8::Handle<T> handle) {
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if (!handle.IsEmpty()) {
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isolate_ = isolate;
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MATE_PERSISTENT_ASSIGN(T, isolate, handle_, handle);
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} else {
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reset();
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}
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}
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void reset() {
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MATE_PERSISTENT_RESET(handle_);
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}
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bool IsEmpty() const {
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return handle_.IsEmpty();
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}
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v8::Handle<T> NewHandle() const {
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return NewHandle(GetIsolate(handle_));
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}
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v8::Handle<T> NewHandle(v8::Isolate* isolate) const {
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if (handle_.IsEmpty())
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return v8::Local<T>();
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return v8::Local<T>::New(isolate, handle_);
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}
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template<typename P, typename C>
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void SetWeak(P* parameter, C callback) {
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MATE_PERSISTENT_SET_WEAK(handle_, parameter, callback);
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}
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v8::Isolate* isolate() const { return isolate_; }
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private:
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template <typename U>
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v8::Isolate* GetIsolate(v8::Handle<U> object_handle) const {
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// Only works for v8::Object and its subclasses. Add specialisations for
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// anything else.
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if (!object_handle.IsEmpty())
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return GetIsolate(object_handle->CreationContext());
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return GetIsolate();
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}
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#if NODE_VERSION_AT_LEAST(0, 11, 0)
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v8::Isolate* GetIsolate(v8::Handle<v8::Context> context_handle) const {
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if (!context_handle.IsEmpty())
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return context_handle->GetIsolate();
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return GetIsolate();
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}
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#endif
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v8::Isolate* GetIsolate(
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v8::Handle<v8::ObjectTemplate> template_handle) const {
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return GetIsolate();
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}
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template <typename U>
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v8::Isolate* GetIsolate(const U& any_handle) const {
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return GetIsolate();
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}
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v8::Isolate* GetIsolate() const {
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if (isolate_)
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return isolate_;
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else
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return v8::Isolate::GetCurrent();
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}
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v8::Isolate* isolate_;
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v8::Persistent<T> handle_;
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DISALLOW_COPY_AND_ASSIGN(ScopedPersistent);
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};
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template <typename T>
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class RefCountedPersistent : public ScopedPersistent<T>,
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public base::RefCounted<RefCountedPersistent<T>> {
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public:
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RefCountedPersistent() {}
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explicit RefCountedPersistent(v8::Handle<v8::Value> handle)
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: ScopedPersistent<T>(handle) {
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}
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protected:
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friend class base::RefCounted<RefCountedPersistent<T>>;
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~RefCountedPersistent() {}
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private:
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DISALLOW_COPY_AND_ASSIGN(RefCountedPersistent);
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};
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template<typename T>
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struct Converter<ScopedPersistent<T> > {
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static v8::Handle<v8::Value> ToV8(v8::Isolate* isolate,
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const ScopedPersistent<T>& val) {
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return val.NewHandle(isolate);
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}
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static bool FromV8(v8::Isolate* isolate,
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v8::Handle<v8::Value> val,
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ScopedPersistent<T>* out) {
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v8::Handle<T> converted;
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if (!Converter<v8::Handle<T> >::FromV8(isolate, val, &converted))
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return false;
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out->reset(isolate, converted);
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return true;
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}
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};
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} // namespace mate
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#endif // NATIVE_MATE_SCOPED_PERSISTENT_H_
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