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DataPRO/IService/Classes/InputRangeAttributes/GainAvailableUnmodifiedAttribute.cs

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+using System;
+
+// ReSharper disable once CheckNamespace
+namespace DTS.DASLib.Service
+{
+    /// <inheritdoc />
+    /// <summary>
+    /// This attribute is used to control whether a gain is available to unmodified gen 3 SPS
+    /// http://fogbugz/fogbugz/default.asp?10080
+    /// the gain should still be available for modified SPS
+    /// this attribute is optional, it is assumed to be available unless explicitly marked as
+    /// unavailable
+    /// </summary>
+    public class GainAvailableUnmodifiedAttribute : Attribute
+    {
+        /// <summary>
+        /// returns whether gain is available to unmodified SPS gen 3 or not
+        /// http://fogbugz/fogbugz/default.asp?10080
+        /// </summary>
+        /// <param name="o"></param>
+        /// <returns></returns>
+        public static bool IsGainAvailableToUnmodified(object o)
+        {
+            if (o == null) return true;
+            var mi = o.GetType().GetMember(o.ToString());
+            if (mi.Length <= 0) return true;
+            return !(GetCustomAttribute(mi[0], typeof(GainAvailableUnmodifiedAttribute)) is GainAvailableUnmodifiedAttribute attr) || attr._bAvailable;
+        }
+
+        private readonly bool _bAvailable;
+        public GainAvailableUnmodifiedAttribute(bool available)
+        {
+            _bAvailable = available;
+        }
+    }
+}