Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

external/referencesource/System.Workflow.Runtime/ContextActivityUtils.cs

@@ -0,0 +1,65 @@
+#pragma warning disable 1634, 1691
+using System;
+using System.Globalization;
+using System.Collections;
+using System.Collections.Generic;
+using System.Collections.Specialized;
+using System.Collections.ObjectModel;
+using System.ComponentModel.Design.Serialization;
+using System.Diagnostics;
+using System.IO;
+using System.Reflection;
+using System.Text;
+using System.Threading;
+using System.Xml;
+using System.Transactions;
+using SES = System.EnterpriseServices;
+using System.Workflow.ComponentModel;
+using System.Workflow.Runtime.Hosting;
+
+namespace System.Workflow.Runtime
+{
+    #region ContextActivityUtils Class
+
+    internal static class ContextActivityUtils
+    {
+        internal static int ContextId(Activity activity)
+        {
+            return ((ActivityExecutionContextInfo)ContextActivity(activity).GetValue(Activity.ActivityExecutionContextInfoProperty)).ContextId;
+        }
+
+        internal static Activity ContextActivity(Activity activity)
+        {
+            Activity contextActivity = activity;
+            while (contextActivity != null && contextActivity.GetValue(Activity.ActivityExecutionContextInfoProperty) == null)
+                contextActivity = contextActivity.Parent;
+            return contextActivity;
+        }
+        internal static Activity ParentContextActivity(Activity activity)
+        {
+            Activity contextActivity = ContextActivity(activity);
+            ActivityExecutionContextInfo executionContextInfo = (ActivityExecutionContextInfo)contextActivity.GetValue(Activity.ActivityExecutionContextInfoProperty);
+            if (executionContextInfo.ParentContextId == -1)
+                return null;
+
+            return RetrieveWorkflowExecutor(activity).GetContextActivityForId(executionContextInfo.ParentContextId);
+        }
+        internal static IWorkflowCoreRuntime RetrieveWorkflowExecutor(Activity activity)
+        {
+            // fetch workflow executor
+            IWorkflowCoreRuntime workflowExecutor = null;
+            Activity rootActivity = activity;
+            while (rootActivity != null && rootActivity.Parent != null)
+                rootActivity = rootActivity.Parent;
+            if (rootActivity != null)
+                workflowExecutor = (IWorkflowCoreRuntime)rootActivity.GetValue(WorkflowExecutor.WorkflowExecutorProperty);
+
+            return workflowExecutor;
+        }
+        internal static Activity RootContextActivity(Activity activity)
+        {
+            return RetrieveWorkflowExecutor(activity).RootActivity;
+        }
+    }
+    #endregion
+}