fix(cleanup): Consolidate the duplicate code in Properties, PropsGump, and PropsConfig (#540)

Projects/UOContent/Gumps/Props/Exceptions.cs

@@ -0,0 +1,109 @@
+using System;
+
+namespace Server.Gumps
+{
+    public abstract class PropertyException : Exception
+    {
+        protected Property m_Property;
+
+        public PropertyException(Property property, string message)
+            : base(message) =>
+            m_Property = property;
+
+        public Property Property => m_Property;
+    }
+
+    public abstract class BindingException : PropertyException
+    {
+        public BindingException(Property property, string message)
+            : base(property, message)
+        {
+        }
+    }
+
+    public sealed class NotYetBoundException : BindingException
+    {
+        public NotYetBoundException(Property property)
+            : base(property, "Property has not yet been bound.")
+        {
+        }
+    }
+
+    public sealed class AlreadyBoundException : BindingException
+    {
+        public AlreadyBoundException(Property property)
+            : base(property, "Property has already been bound.")
+        {
+        }
+    }
+
+    public sealed class UnknownPropertyException : BindingException
+    {
+        public UnknownPropertyException(Property property, string current)
+            : base(property, $"Property '{current}' not found.")
+        {
+        }
+    }
+
+    public sealed class ReadOnlyException : BindingException
+    {
+        public ReadOnlyException(Property property)
+            : base(property, "Property is read-only.")
+        {
+        }
+    }
+
+    public sealed class WriteOnlyException : BindingException
+    {
+        public WriteOnlyException(Property property)
+            : base(property, "Property is write-only.")
+        {
+        }
+    }
+
+    public abstract class AccessException : PropertyException
+    {
+        public AccessException(Property property, string message)
+            : base(property, message)
+        {
+        }
+    }
+
+    public sealed class InternalAccessException : AccessException
+    {
+        public InternalAccessException(Property property)
+            : base(property, "Property is internal.")
+        {
+        }
+    }
+
+    public abstract class ClearanceException : AccessException
+    {
+        public ClearanceException(Property property, AccessLevel playerAccess, AccessLevel neededAccess, string accessType)
+            : base(
+                property,
+                $"You must be at least {Mobile.GetAccessLevelName(neededAccess)} to {accessType} this property."
+            )
+        {
+        }
+
+        public AccessLevel PlayerAccess { get; set; }
+        public AccessLevel NeededAccess { get; set; }
+    }
+
+    public sealed class ReadAccessException : ClearanceException
+    {
+        public ReadAccessException(Property property, AccessLevel playerAccess, AccessLevel neededAccess)
+            : base(property, playerAccess, neededAccess, "read")
+        {
+        }
+    }
+
+    public sealed class WriteAccessException : ClearanceException
+    {
+        public WriteAccessException(Property property, AccessLevel playerAccess, AccessLevel neededAccess)
+            : base(property, playerAccess, neededAccess, "write")
+        {
+        }
+    }
+}