Implement gin::ObjectTemplateBuilder

gin/object_template_builder.h

Index: gin/object_template_builder.h
diff --git a/gin/object_template_builder.h b/gin/object_template_builder.h
new file mode 100644
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+++ b/gin/object_template_builder.h
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+// Copyright 2013 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 GIN_OBJECT_TEMPLATE_BUILDER_H_
+#define GIN_OBJECT_TEMPLATE_BUILDER_H_
+
+#include "base/bind.h"
+#include "base/strings/string_piece.h"
+#include "gin/converter.h"
+#include "gin/function_template.h"
+#include "v8/include/v8.h"
+
+namespace gin {
+
+// ObjectTemplateBuilder provides a handy interface to creating
+// v8::ObjectTemplate instances with various sorts of properties.
+class ObjectTemplateBuilder {
+ public:
+  explicit ObjectTemplateBuilder(v8::Isolate* isolate);
+  ~ObjectTemplateBuilder();
+
+  // It's against Google C++ style to return a non-const ref, but we take some
+  // poetic license here in order that all calls to Set() can be via the '.'
+  // operator and line up nicely.
+  template<typename T>
+  ObjectTemplateBuilder& SetValue(const base::StringPiece& name, T val) {
+    return SetImpl(name, ConvertToV8(isolate_, val));
+  }
+
+  template<typename T>
+  ObjectTemplateBuilder& SetMethod(const base::StringPiece& name, T val) {
+    return SetMethod(name, base::Bind(val));
+  }
+
+  template<typename T>
+  ObjectTemplateBuilder& SetMethod(const base::StringPiece& name,
+                                   const base::Callback<T>& callback) {
+    return SetImpl(name, CreateFunctionTemplate(isolate_, callback));
+  }
+
+  v8::Local<v8::ObjectTemplate> Build();
+
+ private:
+  ObjectTemplateBuilder& SetImpl(const base::StringPiece& name,
+                                 v8::Handle<v8::Data> val);
+
+  v8::Isolate* isolate_;
+
+  // ObjectTemplateBuilder should only be used on the stack.
+  v8::Local<v8::ObjectTemplate> template_;
+};
+
+}  // namespace gin
+
+#endif  // GIN_OBJECT_TEMPLATE_BUILDER_H_