Add the extracted generation templates (#98)

* Add the extracted generation templates

README.md

@@ -70,6 +70,13 @@ To build the project locally on your computer:
    By default, the test project targets all supported frameworks, if your environment only supports a subset then you can specify in the CLI. <br><br>
    `dotnet test -f net5.0`
 
+### Generating from OpenAPI
+
+The templates for autogeneration were extracted using the command:
+```bash
+npx @openapitools/openapi-generator-cli author template -g csharp -o generation/templates
+```
+
 ## Release
 Create a [fork](https://docs.github.com/en/get-started/quickstart/contributing-to-projects) for your changes.
 

generation/templates/AbstractOpenAPISchema.mustache

@@ -0,0 +1,68 @@
+{{>partial_header}}
+
+using System;
+using Newtonsoft.Json;
+using Newtonsoft.Json.Serialization;
+
+namespace {{packageName}}.{{modelPackage}}
+{
+    /// <summary>
+    ///  Abstract base class for oneOf, anyOf schemas in the OpenAPI specification
+    /// </summary>
+    {{>visibility}} abstract partial class AbstractOpenAPISchema
+    {
+        /// <summary>
+        ///  Custom JSON serializer
+        /// </summary>
+        static public readonly JsonSerializerSettings SerializerSettings = new JsonSerializerSettings
+        {
+            // OpenAPI generated types generally hide default constructors.
+            ConstructorHandling = ConstructorHandling.AllowNonPublicDefaultConstructor,
+            MissingMemberHandling = MissingMemberHandling.Error,
+            ContractResolver = new DefaultContractResolver
+            {
+                NamingStrategy = new CamelCaseNamingStrategy
+                {
+                    OverrideSpecifiedNames = false
+                }
+            }
+        };
+
+        /// <summary>
+        ///  Custom JSON serializer for objects with additional properties
+        /// </summary>
+        static public readonly JsonSerializerSettings AdditionalPropertiesSerializerSettings = new JsonSerializerSettings
+        {
+            // OpenAPI generated types generally hide default constructors.
+            ConstructorHandling = ConstructorHandling.AllowNonPublicDefaultConstructor,
+            MissingMemberHandling = MissingMemberHandling.Ignore,
+            ContractResolver = new DefaultContractResolver
+            {
+                NamingStrategy = new CamelCaseNamingStrategy
+                {
+                    OverrideSpecifiedNames = false
+                }
+            }
+        };
+
+        /// <summary>
+        /// Gets or Sets the actual instance
+        /// </summary>
+        public abstract Object ActualInstance { get; set; }
+
+        /// <summary>
+        /// Gets or Sets IsNullable to indicate whether the instance is nullable
+        /// </summary>
+        public bool IsNullable { get; protected set; }
+
+        /// <summary>
+        /// Gets or Sets the schema type, which can be either `oneOf` or `anyOf`
+        /// </summary>
+        public string SchemaType { get; protected set; }
+
+        /// <summary>
+        /// Converts the instance into JSON string.
+        /// </summary>
+        public abstract string ToJson();
+    }
+}