[dotnet] Annotate nullability on Target protocol (SeleniumHQ#15240)

RenderMichael · sandeepsuryaprasad · commit deb5d7378d91 · 2025-03-23T15:07:35.000+05:30
* [dotnet] Annotate nullability on `Target` protocol

* Handle nullability of adjacent `TargetInfo`
diff --git a/dotnet/src/webdriver/DevTools/Target.cs b/dotnet/src/webdriver/DevTools/Target.cs
@@ -21,6 +21,8 @@
 using System.Collections.ObjectModel;
 using System.Threading.Tasks;
 
+#nullable enable
+
 namespace OpenQA.Selenium.DevTools
 {
     /// <summary>
@@ -31,12 +33,12 @@ public abstract class Target
         /// <summary>
         /// Occurs when a target is detached.
         /// </summary>
-        public event EventHandler<TargetDetachedEventArgs> TargetDetached;
+        public event EventHandler<TargetDetachedEventArgs>? TargetDetached;
 
         /// <summary>
         /// Occurs when a target is attached.
         /// </summary>
-        public event EventHandler<TargetAttachedEventArgs> TargetAttached;
+        public event EventHandler<TargetAttachedEventArgs>? TargetAttached;
 
         /// <summary>
         /// Asynchronously gets the targets available for this session.
@@ -46,7 +48,7 @@ public abstract class Target
         /// contains the list of <see cref="TargetInfo"/> objects describing the
         /// targets available for this session.
         /// </returns>
-        public abstract Task<ReadOnlyCollection<TargetInfo>> GetTargets(Object settings = null);
+        public abstract Task<ReadOnlyCollection<TargetInfo>> GetTargets(object? settings = null);
 
         /// <summary>
         /// Asynchronously attaches to a target.
@@ -66,7 +68,7 @@ public abstract class Target
         /// <returns>
         /// A task representing the asynchronous detach operation.
         /// </returns>
-        public abstract Task DetachFromTarget(string sessionId = null, string targetId = null);
+        public abstract Task DetachFromTarget(string? sessionId = null, string? targetId = null);
 
         /// <summary>
         /// Asynchronously sets the DevTools Protocol connection to automatically attach to new targets.
diff --git a/dotnet/src/webdriver/DevTools/TargetInfo.cs b/dotnet/src/webdriver/DevTools/TargetInfo.cs
@@ -17,46 +17,69 @@
 // under the License.
 // </copyright>
 
+#nullable enable
+
 namespace OpenQA.Selenium.DevTools
 {
     /// <summary>
     /// Represents information about the target of a DevTools Protocol command
     /// </summary>
     public class TargetInfo
     {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="TargetInfo"/> type.
+        /// </summary>
+        /// <param name="targetId">The ID of the target.</param>
+        /// <param name="type">The type of target.</param>
+        /// <param name="title">The title of the target.</param>
+        /// <param name="url">The URL of the target.</param>
+        /// <param name="isAttached">Whether the protocol is attached to the target.</param>
+        /// <param name="openerId">The ID of the opener of the target.</param>
+        /// <param name="browserContextId">The browser context ID.</param>
+        public TargetInfo(string targetId, string type, string title, string url, bool isAttached, string? openerId, string? browserContextId)
+        {
+            this.TargetId = targetId;
+            this.Type = type;
+            this.Title = title;
+            this.Url = url;
+            this.IsAttached = isAttached;
+            this.OpenerId = openerId;
+            this.BrowserContextId = browserContextId;
+        }
+
         /// <summary>
         /// Gets the ID of the target.
         /// </summary>
-        public string TargetId { get; internal set; }
+        public string TargetId { get; }
 
         /// <summary>
         /// Gets the type of target.
         /// </summary>
-        public string Type { get; internal set; }
+        public string Type { get; }
 
         /// <summary>
         /// Gets the title of the target.
         /// </summary>
-        public string Title { get; internal set; }
+        public string Title { get; }
 
         /// <summary>
         /// Gets the URL of the target.
         /// </summary>
-        public string Url { get; internal set; }
+        public string Url { get; }
 
         /// <summary>
         /// Gets a value indicating if the protocol is attached to the target.
         /// </summary>
-        public bool IsAttached { get; internal set; }
+        public bool IsAttached { get; }
 
         /// <summary>
         /// Gets the ID of the opener of the target.
         /// </summary>
-        public string OpenerId { get; internal set; }
+        public string? OpenerId { get; }
 
         /// <summary>
         /// Gets the browser context ID.
         /// </summary>
-        public string BrowserContextId { get; internal set; }
+        public string? BrowserContextId { get; }
     }
 }
diff --git a/dotnet/src/webdriver/DevTools/v130/V130Target.cs b/dotnet/src/webdriver/DevTools/v130/V130Target.cs
@@ -23,22 +23,25 @@
 using System.Collections.ObjectModel;
 using System.Threading.Tasks;
 
+#nullable enable
+
 namespace OpenQA.Selenium.DevTools.V130
 {
     /// <summary>
     /// Class providing functionality for manipulating targets for version 130 of the DevTools Protocol
     /// </summary>
     public class V130Target : DevTools.Target
     {
-        private TargetAdapter adapter;
+        private readonly TargetAdapter adapter;
 
         /// <summary>
         /// Initializes a new instance of the <see cref="V130Target"/> class.
         /// </summary>
         /// <param name="adapter">The adapter for the Target domain.</param>
+        /// <exception cref="ArgumentNullException">If <paramref name="adapter"/> is <see langword="null"/>.</exception>
         public V130Target(TargetAdapter adapter)
         {
-            this.adapter = adapter;
+            this.adapter = adapter ?? throw new ArgumentNullException(nameof(adapter));
             adapter.DetachedFromTarget += OnDetachedFromTarget;
             adapter.AttachedToTarget += OnAttachedToTarget;
         }
@@ -51,28 +54,26 @@ public V130Target(TargetAdapter adapter)
         /// contains the list of <see cref="TargetInfo"/> objects describing the
         /// targets available for this session.
         /// </returns>
-        public override async Task<ReadOnlyCollection<TargetInfo>> GetTargets(Object settings = null)
-
+        public override async Task<ReadOnlyCollection<TargetInfo>> GetTargets(object? settings = null)
         {
-            List<TargetInfo> targets = new List<TargetInfo>();
-            if (settings == null)
-            {
-                settings = new GetTargetsCommandSettings();
-            }
+            settings ??= new GetTargetsCommandSettings();
+
             var response = await adapter.GetTargets((GetTargetsCommandSettings)settings).ConfigureAwait(false);
+
+            List<TargetInfo> targets = new List<TargetInfo>(response.TargetInfos.Length);
             for (int i = 0; i < response.TargetInfos.Length; i++)
             {
                 var targetInfo = response.TargetInfos[i];
-                var mapped = new TargetInfo()
-                {
-                    TargetId = targetInfo.TargetId,
-                    Title = targetInfo.Title,
-                    Type = targetInfo.Type,
-                    Url = targetInfo.Url,
-                    OpenerId = targetInfo.OpenerId,
-                    BrowserContextId = targetInfo.BrowserContextId,
-                    IsAttached = targetInfo.Attached
-                };
+                var mapped = new TargetInfo
+                (
+                    targetId: targetInfo.TargetId,
+                    title: targetInfo.Title,
+                    type: targetInfo.Type,
+                    url: targetInfo.Url,
+                    openerId: targetInfo.OpenerId,
+                    browserContextId: targetInfo.BrowserContextId,
+                    isAttached: targetInfo.Attached
+                );
                 targets.Add(mapped);
             }
 
@@ -99,7 +100,7 @@ public override async Task<string> AttachToTarget(string targetId)
         /// <param name="sessionId">The ID of the session of the target from which to detach.</param>
         /// <param name="targetId">The ID of the target from which to detach.</param>
         /// <returns>A task representing the asynchronous detach operation.</returns>
-        public override async Task DetachFromTarget(string sessionId = null, string targetId = null)
+        public override async Task DetachFromTarget(string? sessionId = null, string? targetId = null)
         {
             await adapter.DetachFromTarget(new DetachFromTargetCommandSettings()
             {
@@ -117,23 +118,23 @@ public override async Task SetAutoAttach()
             await adapter.SetAutoAttach(new SetAutoAttachCommandSettings() { AutoAttach = true, WaitForDebuggerOnStart = false, Flatten = true }).ConfigureAwait(false);
         }
 
-        private void OnDetachedFromTarget(object sender, DetachedFromTargetEventArgs e)
+        private void OnDetachedFromTarget(object? sender, DetachedFromTargetEventArgs e)
         {
             this.OnTargetDetached(new TargetDetachedEventArgs(e.SessionId, e.TargetId));
         }
 
-        private void OnAttachedToTarget(object sender, AttachedToTargetEventArgs e)
+        private void OnAttachedToTarget(object? sender, AttachedToTargetEventArgs e)
         {
             var targetInfo = e.TargetInfo == null ? null : new TargetInfo
-            {
-                BrowserContextId = e.TargetInfo.BrowserContextId,
-                IsAttached = e.TargetInfo.Attached,
-                OpenerId = e.TargetInfo.OpenerId,
-                TargetId = e.TargetInfo.TargetId,
-                Title = e.TargetInfo.Title,
-                Type = e.TargetInfo.Type,
-                Url = e.TargetInfo.Url
-            };
+            (
+                browserContextId: e.TargetInfo.BrowserContextId,
+                isAttached: e.TargetInfo.Attached,
+                openerId: e.TargetInfo.OpenerId,
+                targetId: e.TargetInfo.TargetId,
+                title: e.TargetInfo.Title,
+                type: e.TargetInfo.Type,
+                url: e.TargetInfo.Url
+            );
 
             this.OnTargetAttached(new TargetAttachedEventArgs
             (
diff --git a/dotnet/src/webdriver/DevTools/v131/V131Target.cs b/dotnet/src/webdriver/DevTools/v131/V131Target.cs
@@ -23,22 +23,25 @@
 using System.Collections.ObjectModel;
 using System.Threading.Tasks;
 
+#nullable enable
+
 namespace OpenQA.Selenium.DevTools.V131
 {
     /// <summary>
     /// Class providing functionality for manipulating targets for version 131 of the DevTools Protocol
     /// </summary>
     public class V131Target : DevTools.Target
     {
-        private TargetAdapter adapter;
+        private readonly TargetAdapter adapter;
 
         /// <summary>
         /// Initializes a new instance of the <see cref="V131Target"/> class.
         /// </summary>
         /// <param name="adapter">The adapter for the Target domain.</param>
+        /// <exception cref="ArgumentNullException">If <paramref name="adapter"/> is <see langword="null"/>.</exception>
         public V131Target(TargetAdapter adapter)
         {
-            this.adapter = adapter;
+            this.adapter = adapter ?? throw new ArgumentNullException(nameof(adapter));
             adapter.DetachedFromTarget += OnDetachedFromTarget;
             adapter.AttachedToTarget += OnAttachedToTarget;
         }
@@ -51,28 +54,26 @@ public V131Target(TargetAdapter adapter)
         /// contains the list of <see cref="TargetInfo"/> objects describing the
         /// targets available for this session.
         /// </returns>
-        public override async Task<ReadOnlyCollection<TargetInfo>> GetTargets(Object settings = null)
-
+        public override async Task<ReadOnlyCollection<TargetInfo>> GetTargets(object? settings = null)
         {
-            List<TargetInfo> targets = new List<TargetInfo>();
-            if (settings == null)
-            {
-                settings = new GetTargetsCommandSettings();
-            }
+            settings ??= new GetTargetsCommandSettings();
+
             var response = await adapter.GetTargets((GetTargetsCommandSettings)settings).ConfigureAwait(false);
+
+            List<TargetInfo> targets = new List<TargetInfo>(response.TargetInfos.Length);
             for (int i = 0; i < response.TargetInfos.Length; i++)
             {
                 var targetInfo = response.TargetInfos[i];
-                var mapped = new TargetInfo()
-                {
-                    TargetId = targetInfo.TargetId,
-                    Title = targetInfo.Title,
-                    Type = targetInfo.Type,
-                    Url = targetInfo.Url,
-                    OpenerId = targetInfo.OpenerId,
-                    BrowserContextId = targetInfo.BrowserContextId,
-                    IsAttached = targetInfo.Attached
-                };
+                var mapped = new TargetInfo
+                (
+                    targetId: targetInfo.TargetId,
+                    title: targetInfo.Title,
+                    type: targetInfo.Type,
+                    url: targetInfo.Url,
+                    openerId: targetInfo.OpenerId,
+                    browserContextId: targetInfo.BrowserContextId,
+                    isAttached: targetInfo.Attached
+                );
                 targets.Add(mapped);
             }
 
@@ -99,7 +100,7 @@ public override async Task<string> AttachToTarget(string targetId)
         /// <param name="sessionId">The ID of the session of the target from which to detach.</param>
         /// <param name="targetId">The ID of the target from which to detach.</param>
         /// <returns>A task representing the asynchronous detach operation.</returns>
-        public override async Task DetachFromTarget(string sessionId = null, string targetId = null)
+        public override async Task DetachFromTarget(string? sessionId = null, string? targetId = null)
         {
             await adapter.DetachFromTarget(new DetachFromTargetCommandSettings()
             {
@@ -117,23 +118,23 @@ public override async Task SetAutoAttach()
             await adapter.SetAutoAttach(new SetAutoAttachCommandSettings() { AutoAttach = true, WaitForDebuggerOnStart = false, Flatten = true }).ConfigureAwait(false);
         }
 
-        private void OnDetachedFromTarget(object sender, DetachedFromTargetEventArgs e)
+        private void OnDetachedFromTarget(object? sender, DetachedFromTargetEventArgs e)
         {
             this.OnTargetDetached(new TargetDetachedEventArgs(e.SessionId, e.TargetId));
         }
 
-        private void OnAttachedToTarget(object sender, AttachedToTargetEventArgs e)
+        private void OnAttachedToTarget(object? sender, AttachedToTargetEventArgs e)
         {
             var targetInfo = e.TargetInfo == null ? null : new TargetInfo
-            {
-                BrowserContextId = e.TargetInfo.BrowserContextId,
-                IsAttached = e.TargetInfo.Attached,
-                OpenerId = e.TargetInfo.OpenerId,
-                TargetId = e.TargetInfo.TargetId,
-                Title = e.TargetInfo.Title,
-                Type = e.TargetInfo.Type,
-                Url = e.TargetInfo.Url
-            };
+            (
+                browserContextId: e.TargetInfo.BrowserContextId,
+                isAttached: e.TargetInfo.Attached,
+                openerId: e.TargetInfo.OpenerId,
+                targetId: e.TargetInfo.TargetId,
+                title: e.TargetInfo.Title,
+                type: e.TargetInfo.Type,
+                url: e.TargetInfo.Url
+            );
 
             this.OnTargetAttached(new TargetAttachedEventArgs
             (
diff --git a/dotnet/src/webdriver/DevTools/v132/V132Target.cs b/dotnet/src/webdriver/DevTools/v132/V132Target.cs
diff --git a/dotnet/src/webdriver/DevTools/v85/V85Target.cs b/dotnet/src/webdriver/DevTools/v85/V85Target.cs
