code review updates, DecimalUtility with exponent support.

csharp/src/Drivers/Apache/Hive2/DataTypeConversion.cs

@@ -0,0 +1,66 @@
+/*
+* Licensed to the Apache Software Foundation (ASF) under one or more
+* contributor license agreements.  See the NOTICE file distributed with
+* this work for additional information regarding copyright ownership.
+* The ASF licenses this file to You under the Apache License, Version 2.0
+* (the "License"); you may not use this file except in compliance with
+* the License.  You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+using System;
+
+namespace Apache.Arrow.Adbc.Drivers.Apache.Hive2
+{
+    [Flags]
+    internal enum DataTypeConversion
+    {
+        Empty = 0,
+        None = 1,
+        Scalar = 2,
+    }
+
+    internal static class DataTypeConversionParser
+    {
+        internal const string SupportedList = DataTypeConversionOptions.None + ", " + DataTypeConversionOptions.Scalar;
+
+        internal static DataTypeConversion Parse(string? dataTypeConversion)
+        {
+            DataTypeConversion result = DataTypeConversion.Empty;
+
+            if (string.IsNullOrWhiteSpace(dataTypeConversion))
+            {
+                // Default
+                return DataTypeConversion.Scalar;
+            }
+
+            string[] conversions = dataTypeConversion!.Split(',');
+            foreach (string? conversion in conversions)
+            {
+                result |= (conversion?.Trim().ToLowerInvariant()) switch
+                {
+                    null or "" => DataTypeConversion.Empty,
+                    DataTypeConversionOptions.None => DataTypeConversion.None,
+                    DataTypeConversionOptions.Scalar => DataTypeConversion.Scalar,
+                    _ => throw new ArgumentOutOfRangeException(nameof(dataTypeConversion), conversion, "Invalid or unsupported data type conversion"),
+                };
+            }
+
+            if (result.HasFlag(DataTypeConversion.None) && result.HasFlag(DataTypeConversion.Scalar))
+            {
+                throw new ArgumentOutOfRangeException(nameof(dataTypeConversion), dataTypeConversion, "Conflicting data type conversion options");
+            }
+            // Default
+            if (result == DataTypeConversion.Empty) result = DataTypeConversion.Scalar;
+
+            return result;
+        }
+    }
+}