From c3bb7889df67772fdf340e7973e6e22436bfa438 Mon Sep 17 00:00:00 2001
From: Rainer Kartmann <rainer.kartmann@student.kit.edu>
Date: Wed, 3 Apr 2019 10:37:54 +0200
Subject: [PATCH] Added Visitor
---
VirtualRobot/CMakeLists.txt | 2 +
VirtualRobot/MJCF/elements/core/Visitor.cpp | 48 ++++++++++++++++++
VirtualRobot/MJCF/elements/core/Visitor.h | 55 +++++++++++++++++++++
3 files changed, 105 insertions(+)
create mode 100644 VirtualRobot/MJCF/elements/core/Visitor.cpp
create mode 100644 VirtualRobot/MJCF/elements/core/Visitor.h
diff --git a/VirtualRobot/CMakeLists.txt b/VirtualRobot/CMakeLists.txt
index e636b335a..7427eeee2 100644
--- a/VirtualRobot/CMakeLists.txt
+++ b/VirtualRobot/CMakeLists.txt
@@ -328,6 +328,7 @@ SET(SOURCES
MJCF/elements/core/Element.cpp
MJCF/elements/core/exceptions.cpp
MJCF/elements/core/mjcf_utils.cpp
+ MJCF/elements/core/Visitor.cpp
Nodes/CameraSensor.cpp
Nodes/CameraSensorFactory.cpp
@@ -534,6 +535,7 @@ SET(INCLUDES
MJCF/elements/core/Element.h
MJCF/elements/core/exceptions.h
MJCF/elements/core/mjcf_utils.h
+ MJCF/elements/core/Visitor.h
Nodes/CameraSensor.h
Nodes/CameraSensorFactory.h
diff --git a/VirtualRobot/MJCF/elements/core/Visitor.cpp b/VirtualRobot/MJCF/elements/core/Visitor.cpp
new file mode 100644
index 000000000..237cdd4e4
--- /dev/null
+++ b/VirtualRobot/MJCF/elements/core/Visitor.cpp
@@ -0,0 +1,48 @@
+#include "Visitor.h"
+
+#include "AnyElement.h"
+
+namespace mjcf
+{
+
+namespace detail
+{
+
+VisitorAdapter::VisitorAdapter(Visitor& owner) :
+ owner(owner)
+{}
+
+bool VisitorAdapter::visitEnter(const tinyxml2::XMLElement& element)
+{
+ return owner.visitEnter(owner.cast(element));
+}
+
+bool VisitorAdapter::visitExit(const tinyxml2::XMLElement& element)
+{
+ return owner.visitExit(owner.cast(element));
+}
+
+}
+
+Visitor::Visitor(Document& document) : document(document)
+{}
+
+detail::VisitorAdapter* Visitor::adapter()
+{
+ return &_adapter;
+}
+
+const detail::VisitorAdapter* Visitor::adapter() const
+{
+ return &_adapter;
+}
+
+const AnyElement Visitor::cast(const tinyxml2::XMLElement& element)
+{
+ // The constructor of Element requires a non-const element pointer.
+ // As AnyElement is passed as const& to the user-provided visit method,
+ // this const cast should be sufficiently safe.
+ return { &document, const_cast<tinyxml2::XMLElement*>(&element) };
+}
+
+}
diff --git a/VirtualRobot/MJCF/elements/core/Visitor.h b/VirtualRobot/MJCF/elements/core/Visitor.h
new file mode 100644
index 000000000..04a9dbd3a
--- /dev/null
+++ b/VirtualRobot/MJCF/elements/core/Visitor.h
@@ -0,0 +1,55 @@
+#pragma once
+
+#include <VirtualRobot/Util/xml/tinyxml2.h>
+
+
+namespace mjcf
+{
+ class AnyElement;
+ class Document;
+ class Visitor;
+
+namespace detail
+{
+
+ class VisitorAdapter : public tinyxml2::XMLVisitor
+ {
+ public:
+ VisitorAdapter(Visitor& owner);
+ virtual bool visitEnter(const tinyxml2::XMLElement& element);
+ virtual bool visitExit(const tinyxml2::XMLElement& element);
+
+ private:
+ Visitor& owner;
+ };
+
+}
+
+ class Visitor
+ {
+ public:
+
+ Visitor(Document& document);
+ virtual ~Visitor() = default;
+
+ virtual bool visitEnter(const AnyElement&) { return true; }
+ virtual bool visitExit(const AnyElement&) { return true; }
+
+
+ detail::VisitorAdapter* adapter();
+ const detail::VisitorAdapter* adapter() const;
+
+
+ private:
+
+ friend class detail::VisitorAdapter;
+ const AnyElement cast(const tinyxml2::XMLElement& element);
+
+
+ Document& document;
+
+ detail::VisitorAdapter _adapter { *this };
+
+ };
+
+}
--
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