Create common CXML_Object base class for CXML_Content and CXML_Element.

They should each know what they are rather than having an
external ChildRecord struct to track the type.

Change-Id: Ic647ba45569764073e944d30af1a96dccdc29eb3
Reviewed-on: https://pdfium-review.googlesource.com/5210
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Tom Sepez <tsepez@chromium.org>

1 files changed, 45 insertions, 0 deletions

diff --git a/core/fxcrt/xml/cxml_object.h b/core/fxcrt/xml/cxml_object.h
new file mode 100644
index 0000000000..e7f23aa988
--- /dev/null
+++ b/core/fxcrt/xml/cxml_object.h
@@ -0,0 +1,45 @@
+// Copyright 2017 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
+
+#ifndef CORE_FXCRT_XML_CXML_OBJECT_H_
+#define CORE_FXCRT_XML_CXML_OBJECT_H_
+
+#include "core/fxcrt/fx_basic.h"
+
+class CXML_Content;
+class CXML_Element;
+
+class CXML_Object {
+ public:
+  virtual ~CXML_Object();
+
+  virtual CXML_Content* AsContent();
+  virtual const CXML_Content* AsContent() const;
+
+  virtual CXML_Element* AsElement();
+  virtual const CXML_Element* AsElement() const;
+
+ protected:
+  CXML_Object() {}
+};
+
+inline CXML_Content* ToContent(CXML_Object* pObj) {
+  return pObj ? pObj->AsContent() : nullptr;
+}
+
+inline const CXML_Content* ToContent(const CXML_Object* pObj) {
+  return pObj ? pObj->AsContent() : nullptr;
+}
+
+inline CXML_Element* ToElement(CXML_Object* pObj) {
+  return pObj ? pObj->AsElement() : nullptr;
+}
+
+inline const CXML_Element* ToElement(const CXML_Object* pObj) {
+  return pObj ? pObj->AsElement() : nullptr;
+}
+
+#endif  // CORE_FXCRT_XML_CXML_OBJECT_H_