Add PersistentDictionary.

native_mate/dictionary.cc

@@ -19,9 +19,13 @@ Dictionary::Dictionary(v8::Isolate* isolate,
 Dictionary::~Dictionary() {
 }
 
+v8::Handle<v8::Object> Dictionary::GetHandle() const {
+  return object_;
+}
+
 v8::Handle<v8::Value> Converter<Dictionary>::ToV8(v8::Isolate* isolate,
                                                   Dictionary val) {
-  return val.object_;
+  return val.GetHandle();
 }
 
 bool Converter<Dictionary>::FromV8(v8::Isolate* isolate,

native_mate/dictionary.h

@@ -30,30 +30,33 @@ class Dictionary {
 
   template<typename T>
   bool Get(const base::StringPiece& key, T* out) const {
-    v8::Handle<v8::Value> val = object_->Get(StringToV8(isolate_, key));
+    v8::Handle<v8::Value> val = GetHandle()->Get(StringToV8(isolate_, key));
     return ConvertFromV8(isolate_, val, out);
   }
 
   template<typename T>
   bool Set(const base::StringPiece& key, T val) {
-    return object_->Set(StringToV8(isolate_, key), ConvertToV8(isolate_, val));
+    return GetHandle()->Set(StringToV8(isolate_, key),
+                            ConvertToV8(isolate_, val));
   }
 
   template<typename T>
   bool SetMethod(const base::StringPiece& key, const T& callback) {
-    return object_->Set(
+    return GetHandle()->Set(
         StringToV8(isolate_, key),
         CallbackTraits<T>::CreateTemplate(isolate_, callback)->GetFunction());
   }
 
-  v8::Handle<v8::Object> object() const { return object_; }
+  bool IsEmpty() const { return isolate() == NULL; }
+
+  virtual v8::Handle<v8::Object> GetHandle() const;
+
   v8::Isolate* isolate() const { return isolate_; }
 
- private:
-  friend struct Converter<Dictionary>;
-
-  // TODO(aa): Remove this. Instead, get via FromV8(), Set(), and Get().
+ protected:
   v8::Isolate* isolate_;
+
+ private:
   v8::Handle<v8::Object> object_;
 };
 

native_mate/persistent_dictionary.cc

@@ -0,0 +1,34 @@
+// Copyright 2014 Cheng Zhao. All rights reserved.
+// Use of this source code is governed by MIT license that can be found in the
+// LICENSE file.
+
+#include "native_mate/persistent_dictionary.h"
+
+namespace mate {
+
+PersistentDictionary::PersistentDictionary() {
+}
+
+PersistentDictionary::PersistentDictionary(v8::Isolate* isolate,
+                                           v8::Handle<v8::Object> object)
+    : handle_(new RefCountedPersistent<v8::Object>(isolate, object)) {
+  isolate_ = isolate;
+}
+
+PersistentDictionary::~PersistentDictionary() {
+}
+
+v8::Handle<v8::Object> PersistentDictionary::GetHandle() const {
+  return handle_->NewHandle();
+}
+
+bool Converter<PersistentDictionary>::FromV8(v8::Isolate* isolate,
+                                             v8::Handle<v8::Value> val,
+                                             PersistentDictionary* out) {
+  if (!val->IsObject())
+    return false;
+  *out = PersistentDictionary(isolate, v8::Handle<v8::Object>::Cast(val));
+  return true;
+}
+
+}  // namespace mate

native_mate/persistent_dictionary.h

@@ -0,0 +1,36 @@
+// Copyright 2014 Cheng Zhao. All rights reserved.
+// Use of this source code is governed by MIT license that can be found in the
+// LICENSE file.
+
+#ifndef NATIVE_MATE_PERSISTENT_DICTIONARY_H_
+#define NATIVE_MATE_PERSISTENT_DICTIONARY_H_
+
+#include "native_mate/dictionary.h"
+#include "native_mate/scoped_persistent.h"
+
+namespace mate {
+
+// Like Dictionary, but stores object in persistent handle so you can keep it
+// safely on heap.
+class PersistentDictionary : public Dictionary {
+ public:
+  PersistentDictionary();
+  PersistentDictionary(v8::Isolate* isolate, v8::Handle<v8::Object> object);
+  virtual ~PersistentDictionary();
+
+  virtual v8::Handle<v8::Object> GetHandle() const OVERRIDE;
+
+ private:
+  scoped_refptr<RefCountedPersistent<v8::Object> > handle_;
+};
+
+template<>
+struct Converter<PersistentDictionary> {
+  static bool FromV8(v8::Isolate* isolate,
+                     v8::Handle<v8::Value> val,
+                     PersistentDictionary* out);
+};
+
+}  // namespace mate
+
+#endif  // NATIVE_MATE_PERSISTENT_DICTIONARY_H_

native_mate_files.gypi

@@ -17,6 +17,8 @@
       'native_mate/locker.h',
       'native_mate/object_template_builder.cc',
       'native_mate/object_template_builder.h',
+      'native_mate/persistent_dictionary.cc',
+      'native_mate/persistent_dictionary.h',
       'native_mate/scoped_persistent.h',
       'native_mate/template_util.h',
       'native_mate/try_catch.cc',