V8 Binding: Introduce toNativeWithTypeCheck

Source/bindings/v8/custom/V8TypedArrayCustom.h

 /*
  * 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
@@ skipping 35 matching lines @@
 
 template<typename TypedArray>
 class V8TypedArray {
 public:
     static bool hasInstance(v8::Handle<v8::Value> value, v8::Isolate*)
     {
         return TypedArrayTraits<TypedArray>::IsInstance(value);
     }
 
     static TypedArray* toNative(v8::Handle<v8::Object>);
+    static TypedArray* toNativeWithTypeCheck(v8::Isolate*, v8::Handle<v8::Value>);
     static void derefObject(void*);
     static const WrapperTypeInfo wrapperTypeInfo;
     static const int internalFieldCount = v8DefaultWrapperInternalFieldCount;
 
     static v8::Handle<v8::Object> wrap(TypedArray* impl, v8::Handle<v8::Object> creationContext, v8::Isolate* isolate)
     {
         ASSERT(impl);
         ASSERT(!DOMDataStore::containsWrapper<Binding>(impl, isolate));
         return V8TypedArray<TypedArray>::createWrapper(impl, creationContext, isolate);
     }
@@ skipping 96 matching lines @@
     RefPtr<ArrayBuffer> arrayBuffer = V8ArrayBuffer::toNative(view->Buffer());
     RefPtr<TypedArray> typedArray = TypedArray::create(arrayBuffer, view->ByteOffset(), Traits::length(view));
     ASSERT(typedArray.get());
     V8DOMWrapper::associateObjectWithWrapper<Binding>(typedArray.release(), &wrapperTypeInfo, object, v8::Isolate::GetCurrent(), WrapperConfiguration::Independent);
 
     typedarrayPtr = object->GetAlignedPointerFromInternalField(v8DOMWrapperObjectIndex);
     ASSERT(typedarrayPtr);
     return reinterpret_cast<TypedArray*>(typedarrayPtr);
 }
 
+template <typename TypedArray>
+TypedArray* V8TypedArray<TypedArray>::toNativeWithTypeCheck(v8::Isolate* isolate, v8::Handle<v8::Value> value)
+{
+    return V8TypedArray<TypedArray>::hasInstance(value, isolate) ? V8TypedArray<TypedArray>::toNative(v8::Handle<v8::Object>::Cast(value)) : 0;
+}
 
 template <typename TypedArray>
 const WrapperTypeInfo V8TypedArray<TypedArray>::wrapperTypeInfo = {
     gin::kEmbedderBlink,
     0, V8TypedArray<TypedArray>::derefObject,
     0, 0, 0, 0, 0, WrapperTypeObjectPrototype, false
 };
 
 template <typename TypedArray>
 void V8TypedArray<TypedArray>::derefObject(void* object)
 {
     static_cast<TypedArray*>(object)->deref();
 }
 
 
 } // namespace WebCode
 
 #endif // V8TypedArrayCustom_h