Adds support for Copy Constructors

src/Microsoft.OpenApi/Any/CloneHelper.cs

@@ -0,0 +1,36 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT license.
+
+using System.Reflection;
+
+namespace Microsoft.OpenApi.Any
+{
+    /// <summary>
+    /// Contains logic for cloning objects through copy constructors.
+    /// </summary>
+    public class CloneHelper
+    {
+        /// <summary>
+        /// Clones an instance of <see cref="IOpenApiAny"/> object from the copy constructor
+        /// </summary>
+        /// <param name="obj">The object instance.</param>
+        /// <returns>A clone copy or the object itself.</returns>
+        public static IOpenApiAny CloneFromCopyConstructor(IOpenApiAny obj)
+        {
+            if (obj != null)
+            {
+                var t = obj.GetType();
+                foreach (ConstructorInfo ci in t.GetConstructors())
+                {
+                    ParameterInfo[] pi = ci.GetParameters();
+                    if (pi.Length == 1 && pi[0].ParameterType == t)
+                    {
+                        return (IOpenApiAny)ci.Invoke(new object[] { obj });
+                    }
+                }
+            }
+
+            return obj;
+        }
+    }
+}

src/Microsoft.OpenApi/Any/IOpenApiAny.cs

@@ -1,6 +1,7 @@
 // Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT license. 
 
+using System;
 using Microsoft.OpenApi.Interfaces;
 
 namespace Microsoft.OpenApi.Any

src/Microsoft.OpenApi/Any/OpenApiArray.cs

@@ -2,6 +2,7 @@
 // Licensed under the MIT license. 
 
 using Microsoft.OpenApi.Writers;
+using System;
 using System.Collections.Generic;
 
 namespace Microsoft.OpenApi.Any

src/Microsoft.OpenApi/Any/OpenApiPrimitive.cs

@@ -2,6 +2,7 @@
 // Licensed under the MIT license. 
 
 using System;
+using System.Reflection;
 using System.Text;
 using Microsoft.OpenApi.Exceptions;
 using Microsoft.OpenApi.Properties;
@@ -24,6 +25,15 @@ public OpenApiPrimitive(T value)
             Value = value;
         }
 
+        /// <summary>
+        /// Initializes a copy of an <see cref="IOpenApiPrimitive"/> object
+        /// </summary>
+        /// <param name="openApiPrimitive"></param>
+        public OpenApiPrimitive(OpenApiPrimitive<T> openApiPrimitive)
+        {
+            Value = openApiPrimitive.Value;
+        }
+
         /// <summary>
         /// The kind of <see cref="IOpenApiAny"/>.
         /// </summary>

src/Microsoft.OpenApi/Models/OpenApiCallback.cs

@@ -35,6 +35,22 @@ public class OpenApiCallback : IOpenApiSerializable, IOpenApiReferenceable, IOpe
         /// </summary>
         public IDictionary<string, IOpenApiExtension> Extensions { get; set; } = new Dictionary<string, IOpenApiExtension>();
 
+        /// <summary>
+        /// Parameter-less constructor
+        /// </summary>
+        public OpenApiCallback() { }
+
+        /// <summary>
+        /// Initializes a copy of an <see cref="OpenApiCallback"/> object
+        /// </summary>
+        public OpenApiCallback(OpenApiCallback callback)
+        {
+            PathItems = new(callback.PathItems);
+            UnresolvedReference = callback.UnresolvedReference;
+            Reference = new(callback.Reference);
+            Extensions = new Dictionary<string, IOpenApiExtension>(callback.Extensions);
+        }
+
         /// <summary>
         /// Add a <see cref="OpenApiPathItem"/> into the <see cref="PathItems"/>.
         /// </summary>

src/Microsoft.OpenApi/Models/OpenApiComponents.cs

@@ -68,6 +68,28 @@ public class OpenApiComponents : IOpenApiSerializable, IOpenApiExtensible
         /// </summary>
         public IDictionary<string, IOpenApiExtension> Extensions { get; set; } = new Dictionary<string, IOpenApiExtension>();
 
+        /// <summary>
+        /// Parameter-less constructor
+        /// </summary>
+        public OpenApiComponents() { }
+
+        /// <summary>
+        /// Initializes a copy of an <see cref="OpenApiComponents"/> object
+        /// </summary>
+        public OpenApiComponents(OpenApiComponents components)
+        {
+            Schemas = new Dictionary<string, OpenApiSchema>(components.Schemas);
+            Responses = new Dictionary<string, OpenApiResponse>(components.Responses);
+            Parameters = new Dictionary<string, OpenApiParameter>(components.Parameters);
+            Examples = new Dictionary<string, OpenApiExample>(components.Examples);
+            RequestBodies = new Dictionary<string, OpenApiRequestBody>(components.RequestBodies);
+            Headers = new Dictionary<string, OpenApiHeader>(components.Headers);
+            SecuritySchemes = new Dictionary<string, OpenApiSecurityScheme>(components.SecuritySchemes);
+            Links = new Dictionary<string, OpenApiLink>(components.Links);
+            Callbacks = new Dictionary<string, OpenApiCallback>(components.Callbacks);
+            Extensions = new Dictionary<string, IOpenApiExtension>(components.Extensions);
+        }
+
         /// <summary>
         /// Serialize <see cref="OpenApiComponents"/> to Open Api v3.0.
         /// </summary>

src/Microsoft.OpenApi/Models/OpenApiContact.cs

@@ -35,6 +35,22 @@ public class OpenApiContact : IOpenApiSerializable, IOpenApiExtensible
         /// </summary>
         public IDictionary<string, IOpenApiExtension> Extensions { get; set; } = new Dictionary<string, IOpenApiExtension>();
 
+        /// <summary>
+        /// Parameter-less constructor
+        /// </summary>
+        public OpenApiContact() { }
+
+        /// <summary>
+        /// Initializes a copy of an <see cref="OpenApiContact"/> instance
+        /// </summary>
+        public OpenApiContact(OpenApiContact contact)
+        {
+            Name = contact.Name;
+            Url = new Uri(contact.Url.OriginalString);
+            Email = contact.Email;
+            Extensions = new Dictionary<string, IOpenApiExtension>(contact.Extensions);
+        }
+
         /// <summary>
         /// Serialize <see cref="OpenApiContact"/> to Open Api v3.0
         /// </summary>

src/Microsoft.OpenApi/Models/OpenApiDiscriminator.cs

@@ -22,6 +22,20 @@ public class OpenApiDiscriminator : IOpenApiSerializable
         /// </summary>
         public IDictionary<string, string> Mapping { get; set; } = new Dictionary<string, string>();
 
+        /// <summary>
+        /// Parameter-less constructor
+        /// </summary>
+        public OpenApiDiscriminator() { }
+
+        /// <summary>
+        /// Initializes a copy of an <see cref="OpenApiDiscriminator"/> instance
+        /// </summary>
+        public OpenApiDiscriminator(OpenApiDiscriminator discriminator)
+        {
+            PropertyName = discriminator.PropertyName;
+            Mapping = new Dictionary<string, string>(discriminator.Mapping);
+        }
+
         /// <summary>
         /// Serialize <see cref="OpenApiDiscriminator"/> to Open Api v3.0
         /// </summary>

src/Microsoft.OpenApi/Models/OpenApiDocument.cs

@@ -4,8 +4,6 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
-using System.Runtime.CompilerServices;
-using Microsoft.OpenApi.Any;
 using Microsoft.OpenApi.Exceptions;
 using Microsoft.OpenApi.Interfaces;
 using Microsoft.OpenApi.Services;
@@ -64,6 +62,27 @@ public class OpenApiDocument : IOpenApiSerializable, IOpenApiExtensible
         /// </summary>
         public IDictionary<string, IOpenApiExtension> Extensions { get; set; } = new Dictionary<string, IOpenApiExtension>();
 
+        /// <summary>
+        /// Parameter-less constructor
+        /// </summary>
+        public OpenApiDocument() {}
+
+        /// <summary>
+        /// Initializes a copy of an an <see cref="OpenApiDocument"/> object
+        /// </summary>
+        public OpenApiDocument(OpenApiDocument document)
+        {
+            Workspace = new(document.Workspace);
+            Info = new(document.Info);
+            Servers = new List<OpenApiServer>(document.Servers);
+            Paths = new(document.Paths);
+            Components = new(document.Components);
+            SecurityRequirements = new List<OpenApiSecurityRequirement>(document.SecurityRequirements);
+            Tags = new List<OpenApiTag>(document.Tags);
+            ExternalDocs = new(document.ExternalDocs);
+            Extensions = new Dictionary<string, IOpenApiExtension>(document.Extensions);
+        }
+
         /// <summary>
         /// Serialize <see cref="OpenApiDocument"/> to the latest patch of OpenAPI object V3.0.
         /// </summary>

src/Microsoft.OpenApi/Models/OpenApiEncoding.cs

@@ -53,6 +53,24 @@ public class OpenApiEncoding : IOpenApiSerializable, IOpenApiExtensible
         /// </summary>
         public IDictionary<string, IOpenApiExtension> Extensions { get; set; } = new Dictionary<string, IOpenApiExtension>();
 
+        /// <summary>
+        /// Parameter-less constructor
+        /// </summary>
+        public OpenApiEncoding() {}
+
+        /// <summary>
+        /// Initializes a copy of an <see cref="OpenApiEncoding"/> object
+        /// </summary>
+        public OpenApiEncoding(OpenApiEncoding encoding)
+        {
+            ContentType = encoding.ContentType;
+            Headers = new Dictionary<string, OpenApiHeader>(encoding.Headers);
+            Style = encoding.Style;
+            Explode = encoding.Explode;
+            AllowReserved = encoding.AllowReserved;
+            Extensions = new Dictionary<string, IOpenApiExtension>(encoding.Extensions);
+        }
+
         /// <summary>
         /// Serialize <see cref="OpenApiExternalDocs"/> to Open Api v3.0.
         /// </summary>

src/Microsoft.OpenApi/Models/OpenApiError.cs

@@ -26,6 +26,15 @@ public OpenApiError(string pointer, string message)
             Message = message;
         }
 
+        /// <summary>
+        /// Initializes a copy of an <see cref="OpenApiError"/> object
+        /// </summary>
+        public OpenApiError(OpenApiError error)
+        {
+            Pointer = error.Pointer;
+            Message = error.Message;
+        }
+
         /// <summary>
         /// Message explaining the error.
         /// </summary>

src/Microsoft.OpenApi/Models/OpenApiExample.cs

@@ -54,6 +54,25 @@ public class OpenApiExample : IOpenApiSerializable, IOpenApiReferenceable, IOpen
         /// </summary>
         public bool UnresolvedReference { get; set; } = false;
 
+        /// <summary>
+        /// Parameter-less constructor
+        /// </summary>
+        public OpenApiExample() {}
+
+        /// <summary>
+        /// Initializes a copy of <see cref="OpenApiExample"/> object
+        /// </summary>
+        public OpenApiExample(OpenApiExample example)
+        {
+            Summary = example.Summary;
+            Description = example.Description;
+            Value = CloneHelper.CloneFromCopyConstructor(example.Value);
+            ExternalValue = example.ExternalValue;
+            Extensions = new Dictionary<string, IOpenApiExtension>(example.Extensions);
+            Reference = new(example.Reference);
+            UnresolvedReference = example.UnresolvedReference;
+        }
+
         /// <summary>
         /// Serialize <see cref="OpenApiExample"/> to Open Api v3.0
         /// </summary>

src/Microsoft.OpenApi/Models/OpenApiExternalDocs.cs

@@ -29,6 +29,21 @@ public class OpenApiExternalDocs : IOpenApiSerializable, IOpenApiExtensible
         /// </summary>
         public IDictionary<string, IOpenApiExtension> Extensions { get; set; } = new Dictionary<string, IOpenApiExtension>();
 
+        /// <summary>
+        /// Parameter-less constructor
+        /// </summary>
+        public OpenApiExternalDocs() {}
+
+        /// <summary>
+        /// Initializes a copy of an <see cref="OpenApiExternalDocs"/> object
+        /// </summary>
+        public OpenApiExternalDocs(OpenApiExternalDocs externalDocs)
+        {
+            Description = externalDocs.Description;
+            Url = new Uri(externalDocs.Url.OriginalString);
+            Extensions = new Dictionary<string, IOpenApiExtension>(externalDocs.Extensions);
+        }
+
         /// <summary>
         /// Serialize <see cref="OpenApiExternalDocs"/> to Open Api v3.0.
         /// </summary>

src/Microsoft.OpenApi/Models/OpenApiHeader.cs

@@ -86,6 +86,32 @@ public class OpenApiHeader : IOpenApiSerializable, IOpenApiReferenceable, IOpenA
         /// </summary>
         public IDictionary<string, IOpenApiExtension> Extensions { get; set; } = new Dictionary<string, IOpenApiExtension>();
 
+        /// <summary>
+        /// Parameter-less constructor
+        /// </summary>
+        public OpenApiHeader() {}
+
+        /// <summary>
+        /// Initializes a copy of an <see cref="OpenApiHeader"/> object
+        /// </summary>
+        public OpenApiHeader(OpenApiHeader header)
+        {
+            UnresolvedReference = header.UnresolvedReference;
+            Reference = new(header.Reference);
+            Description = header.Description;
+            Required = header.Required;
+            Deprecated = header.Deprecated;
+            AllowEmptyValue = header.AllowEmptyValue;
+            Style = header.Style;
+            Explode = header.Explode;
+            AllowReserved = header.AllowReserved;
+            Schema = new(header.Schema);
+            Example = CloneHelper.CloneFromCopyConstructor(header.Example);
+            Examples = new Dictionary<string, OpenApiExample>(header.Examples);
+            Content = new Dictionary<string, OpenApiMediaType>(header.Content);
+            Extensions = new Dictionary<string, IOpenApiExtension>(header.Extensions);
+        }
+
         /// <summary>
         /// Serialize <see cref="OpenApiHeader"/> to Open Api v3.0
         /// </summary>

src/Microsoft.OpenApi/Models/OpenApiInfo.cs

@@ -49,6 +49,25 @@ public class OpenApiInfo : IOpenApiSerializable, IOpenApiExtensible
         /// </summary>
         public IDictionary<string, IOpenApiExtension> Extensions { get; set; } = new Dictionary<string, IOpenApiExtension>();
 
+        /// <summary>
+        /// Parameter-less constructor
+        /// </summary>
+        public OpenApiInfo() {}
+
+        /// <summary>
+        /// Initializes a copy of an <see cref="OpenApiInfo"/> object
+        /// </summary>
+        public OpenApiInfo(OpenApiInfo info)
+        {
+            Title = info.Title;
+            Description = info.Description;
+            Version = info.Version;
+            TermsOfService = info.TermsOfService;
+            Contact = new(info.Contact);
+            License = new(info.License);
+            Extensions = new Dictionary<string, IOpenApiExtension>(info.Extensions);
+        }
+
         /// <summary>
         /// Serialize <see cref="OpenApiInfo"/> to Open Api v3.0
         /// </summary>

src/Microsoft.OpenApi/Models/OpenApiLicense.cs

@@ -29,6 +29,21 @@ public class OpenApiLicense : IOpenApiSerializable, IOpenApiExtensible
         /// </summary>
         public IDictionary<string, IOpenApiExtension> Extensions { get; set; } = new Dictionary<string, IOpenApiExtension>();
 
+        /// <summary>
+        /// Parameterless constructor
+        /// </summary>
+        public OpenApiLicense() {}
+
+        /// <summary>
+        /// Initializes a copy of an <see cref="OpenApiLicense"/> object
+        /// </summary>
+        public OpenApiLicense(OpenApiLicense license)
+        {
+            Name = license.Name;
+            Url = new Uri(license.Url.OriginalString);
+            Extensions = new Dictionary<string, IOpenApiExtension>(license.Extensions);
+        }
+
         /// <summary>
         /// Serialize <see cref="OpenApiLicense"/> to Open Api v3.0
         /// </summary>