Adds a copy constructor for all models and cleans up code

Author: MaggieKimani1

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 = callback.PathItems;
+            UnresolvedReference = callback.UnresolvedReference;
+            Reference = callback.Reference;
+            Extensions = 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 = components.Schemas;
+            Responses = components.Responses;
+            Parameters = components.Parameters;
+            Examples = components.Examples;
+            RequestBodies = components.RequestBodies;
+            Headers = components.Headers;
+            SecuritySchemes = components.SecuritySchemes;
+            Links = components.Links;
+            Callbacks = components.Callbacks;
+            Extensions = 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 = contact.Url;
+            Email = contact.Email;
+            Extensions = 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 = 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 = document.Workspace;
+            Info = document.Info;
+            Servers = document.Servers;
+            Paths = document.Paths;
+            Components = document.Components;
+            SecurityRequirements = document.SecurityRequirements;
+            Tags = document.Tags;
+            ExternalDocs = document.ExternalDocs;
+            Extensions = 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 = encoding.Headers;
+            Style = encoding.Style;
+            Explode = encoding.Explode;
+            AllowReserved = encoding.AllowReserved;
+            Extensions = 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 = example.Value;
+            ExternalValue = example.ExternalValue;
+            Extensions = example.Extensions;
+            Reference = 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 = externalDocs.Url;
+            Extensions = 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 = header.Reference;
+            Description = header.Description;
+            Required = header.Required;
+            Deprecated = header.Deprecated;
+            AllowEmptyValue = header.AllowEmptyValue;
+            Style = header.Style;
+            Explode = header.Explode;
+            AllowReserved = header.AllowReserved;
+            Schema = header.Schema;
+            Example = header.Example;
+            Examples = header.Examples;
+            Content = header.Content;
+            Extensions = header.Extensions;
+        }
+
         /// <summary>
         /// Serialize <see cref="OpenApiHeader"/> to Open Api v3.0
         /// </summary>