From 74bb9cd27242b9320f99ff4d2b50c3051576cc14 Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Tue, 8 Feb 2022 16:53:51 +0800
Subject: ...

---
 include/cru/ui/mapper/Mapper.h | 92 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 include/cru/ui/mapper/Mapper.h

(limited to 'include/cru/ui/mapper/Mapper.h')

diff --git a/include/cru/ui/mapper/Mapper.h b/include/cru/ui/mapper/Mapper.h
new file mode 100644
index 00000000..fa7f8cef
--- /dev/null
+++ b/include/cru/ui/mapper/Mapper.h
@@ -0,0 +1,92 @@
+#pragma once
+#include "../Base.h"
+
+#include "cru/common/ClonablePtr.h"
+#include "cru/common/Exception.h"
+#include "cru/xml/XmlNode.h"
+
+#include <memory>
+#include <type_traits>
+#include <typeindex>
+#include <typeinfo>
+
+namespace cru::ui::mapper {
+template <typename T>
+class BasicMapper;
+
+class CRU_UI_API MapperBase : public Object {
+ public:
+  explicit MapperBase(std::type_index type_index);
+
+  CRU_DELETE_COPY(MapperBase)
+  CRU_DELETE_MOVE(MapperBase)
+
+  ~MapperBase() override = default;
+
+ public:
+  std::type_index GetTypeIndex() const { return type_index_; }
+
+  template <typename T>
+  BasicMapper<T>* StaticCast() {
+    return static_cast<BasicMapper<T>*>(this);
+  }
+
+  template <typename T>
+  BasicMapper<T>* DynamicCast() {
+    return dynamic_cast<BasicMapper<T>*>(this);
+  }
+
+  virtual bool SupportMapFromString() { return false; }
+  virtual bool SupportMapFromXml() { return false; }
+  virtual bool XmlElementIsOfThisType(xml::XmlElementNode* node) {
+    return false;
+  }
+
+ private:
+  std::type_index type_index_;
+};
+
+template <typename T>
+class CRU_UI_API BasicMapper : public MapperBase {
+ public:
+  static_assert(std::is_default_constructible_v<T>,
+                "T must be default constructible.");
+
+  BasicMapper() : MapperBase(typeid(T)) {}
+
+  CRU_DELETE_COPY(BasicMapper)
+  CRU_DELETE_MOVE(BasicMapper)
+
+  ~BasicMapper() override = default;
+
+  virtual T MapFromString(String str) {
+    if (!SupportMapFromString()) {
+      throw Exception(u"This mapper does not support map from string.");
+    }
+
+    return DoMapFromString(str);
+  }
+
+  T MapFromXml(xml::XmlElementNode* node) {
+    if (!SupportMapFromXml()) {
+      throw Exception(u"This mapper does not support map from xml.");
+    }
+
+    if (!XmlElementIsOfThisType(node)) {
+      throw Exception(u"This xml element is not of mapping type.");
+    }
+
+    return DoMapFromXml(node);
+  }
+
+ protected:
+  virtual T DoMapFromString(String str) { return {}; }
+  virtual T DoMapFromXml(xml::XmlElementNode* node) { return {}; }
+};
+
+template <typename T>
+using BasicRefMapper = BasicMapper<std::shared_ptr<T>>;
+
+template <typename T>
+using BasicPtrMapper = BasicMapper<ClonablePtr<T>>;
+}  // namespace cru::ui::mapper
-- 
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