protected override bool UnionBranchMatches()

in lang/csharp/src/apache/main/Generic/GenericDatumWriter.cs [98:140]
40 lines of code
23 McCabe index (conditional complexity)

        protected override bool UnionBranchMatches(Schema sc, object obj)
        {
            if (obj == null && sc.Tag != Avro.Schema.Type.Null) return false;
            switch (sc.Tag)
            {
                case Schema.Type.Null:
                    return obj == null;
                case Schema.Type.Boolean:
                    return obj is bool;
                case Schema.Type.Int:
                    return obj is int;
                case Schema.Type.Long:
                    return obj is long;
                case Schema.Type.Float:
                    return obj is float;
                case Schema.Type.Double:
                    return obj is double;
                case Schema.Type.Bytes:
                    return obj is byte[];
                case Schema.Type.String:
                    return obj is string;
                case Schema.Type.Error:
                case Schema.Type.Record:
                    //return obj is GenericRecord && (obj as GenericRecord).Schema.Equals(s);
                    return obj is GenericRecord && (obj as GenericRecord).Schema.SchemaName.Equals((sc as RecordSchema).SchemaName);
                case Schema.Type.Enumeration:
                    //return obj is GenericEnum && (obj as GenericEnum).Schema.Equals(s);
                    return obj is GenericEnum && (obj as GenericEnum).Schema.SchemaName.Equals((sc as EnumSchema).SchemaName);
                case Schema.Type.Array:
                    return obj is Array && !(obj is byte[]);
                case Schema.Type.Map:
                    return obj is IDictionary<string, object>;
                case Schema.Type.Union:
                    return false;   // Union directly within another union not allowed!
                case Schema.Type.Fixed:
                    //return obj is GenericFixed && (obj as GenericFixed).Schema.Equals(s);
                    return obj is GenericFixed && (obj as GenericFixed).Schema.SchemaName.Equals((sc as FixedSchema).SchemaName);
                case Schema.Type.Logical:
                    return (sc as LogicalSchema).LogicalType.IsInstanceOfLogicalType(obj);
                default:
                    throw new AvroException("Unknown schema type: " + sc.Tag);
            }
        }