Remove CXFA_Node friend class

This CL removes the CXFA_Document friendship with CXFA_Node and adds a
CXFA_Node::Create method to create the node objects.
Change-Id: If77f9a631b3aa0720803c869446135b8cc17d3c3
Reviewed-on: https://pdfium-review.googlesource.com/18250
Commit-Queue: dsinclair <dsinclair@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>

3 files changed, 20 insertions, 10 deletions

diff --git a/xfa/fxfa/parser/cxfa_document.cpp b/xfa/fxfa/parser/cxfa_document.cpp
index c80dec979a..c374b762ba 100644
--- a/xfa/fxfa/parser/cxfa_document.cpp
+++ b/xfa/fxfa/parser/cxfa_document.cpp
@@ -214,15 +214,14 @@ CXFA_Node* CXFA_Document::CreateNode(const XFA_PACKETINFO* pPacket,
     return nullptr;
 
   const XFA_ELEMENTINFO* pElement = XFA_GetElementByID(eElement);
-  if (pElement && (pElement->dwPackets & pPacket->eName)) {
-    CXFA_Node* pNode =
-        new CXFA_Node(this, pPacket->eName, pElement->eObjectType,
-                      pElement->eName, pElement->pName);
-    AddPurgeNode(pNode);
-    return pNode;
-  }
+  if (!pElement || !(pElement->dwPackets & pPacket->eName))
+    return nullptr;
 
-  return nullptr;
+  std::unique_ptr<CXFA_Node> pNode =
+      CXFA_Node::Create(this, pPacket->eName, pElement);
+  // TODO(dsinclair): AddPrugeNode should take ownership of the pointer.
+  AddPurgeNode(pNode.get());
+  return pNode.release();
 }
 
 void CXFA_Document::AddPurgeNode(CXFA_Node* pNode) {
diff --git a/xfa/fxfa/parser/cxfa_node.cpp b/xfa/fxfa/parser/cxfa_node.cpp
index a91b87766d..2ab0b18cf5 100644
--- a/xfa/fxfa/parser/cxfa_node.cpp
+++ b/xfa/fxfa/parser/cxfa_node.cpp
@@ -143,6 +143,14 @@ const XFA_ATTRIBUTEENUMINFO* GetAttributeEnumByID(XFA_ATTRIBUTEENUM eName) {
   return g_XFAEnumData + eName;
 }
 
+// static
+std::unique_ptr<CXFA_Node> CXFA_Node::Create(CXFA_Document* doc,
+                                             XFA_XDPPACKET packet,
+                                             const XFA_ELEMENTINFO* pElement) {
+  return std::unique_ptr<CXFA_Node>(new CXFA_Node(
+      doc, packet, pElement->eObjectType, pElement->eName, pElement->pName));
+}
+
 CXFA_Node::CXFA_Node(CXFA_Document* pDoc,
                      uint16_t ePacket,
                      XFA_ObjectType oType,
diff --git a/xfa/fxfa/parser/cxfa_node.h b/xfa/fxfa/parser/cxfa_node.h
index 47be027d28..073fd5261f 100644
--- a/xfa/fxfa/parser/cxfa_node.h
+++ b/xfa/fxfa/parser/cxfa_node.h
@@ -8,6 +8,7 @@
 #define XFA_FXFA_PARSER_CXFA_NODE_H_
 
 #include <map>
+#include <memory>
 #include <vector>
 
 #include "core/fxcrt/fx_string.h"
@@ -45,6 +46,10 @@ const XFA_ATTRIBUTEENUMINFO* GetAttributeEnumByID(XFA_ATTRIBUTEENUM eName);
 
 class CXFA_Node : public CXFA_Object {
  public:
+  static std::unique_ptr<CXFA_Node> Create(CXFA_Document* doc,
+                                           XFA_XDPPACKET packet,
+                                           const XFA_ELEMENTINFO* pElement);
+
   ~CXFA_Node() override;
 
   uint32_t GetPacketID() const { return m_ePacket; }
@@ -136,8 +141,6 @@ class CXFA_Node : public CXFA_Object {
   CXFA_Node* GetOccurNode();
 
  private:
-  friend class CXFA_Document;
-
   CXFA_Node(CXFA_Document* pDoc,
             uint16_t ePacket,
             XFA_ObjectType oType,