Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Activities/System/Activities/Tracking/ActivityStateQuery.cs

@@ -0,0 +1,88 @@
+//------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//------------------------------------------------------------
+
+namespace System.Activities.Tracking
+{
+    using System.Collections.ObjectModel;
+
+    public class ActivityStateQuery : TrackingQuery
+    {
+        Collection<string> arguments;
+        Collection<string> states;
+        Collection<string> variables;        
+        
+        public ActivityStateQuery()
+        {
+            this.ActivityName = "*";
+        }
+
+        public string ActivityName
+        {
+            get;
+            set;
+        }
+
+        public Collection<string> Arguments
+        {
+            get
+            {
+                if (this.arguments == null)
+                {
+                    this.arguments = new Collection<string>();
+                }
+
+                return this.arguments;
+            }
+        }
+
+        public Collection<string> Variables
+        {
+            get
+            {
+                if (this.variables == null)
+                {
+                    this.variables = new Collection<string>();
+                }
+
+                return this.variables;
+            }
+        }        
+
+        public Collection<string> States
+        {
+            get
+            {
+                if (this.states == null)
+                {
+                    this.states = new Collection<string>();
+                }
+                return this.states;
+            }
+        }
+
+        internal bool HasStates
+        {
+            get
+            {
+                return this.states != null && this.states.Count > 0;
+            }
+        }
+
+        internal bool HasArguments
+        {
+            get
+            {
+                return this.arguments != null && this.arguments.Count > 0;
+            }
+        }
+
+        internal bool HasVariables
+        {
+            get
+            {
+                return this.variables != null && this.variables.Count > 0;
+            }
+        }        
+    }
+}