Mark as Serializable

Author: amroel

src/NHibernate/Dialect/BitwiseFunctionOperation.cs

@@ -0,0 +1,98 @@
+using System;
+using System.Collections;
+using NHibernate.Dialect.Function;
+using NHibernate.Engine;
+using NHibernate.SqlCommand;
+using NHibernate.Type;
+
+namespace NHibernate.Dialect
+{
+	[Serializable]
+	public class BitwiseFunctionOperation : ISQLFunction
+	{
+		private readonly string _functionName;
+		private SqlStringBuilder _sqlBuffer;
+		private Queue _args;
+
+		public BitwiseFunctionOperation(string functionName)
+		{
+			_functionName = functionName;			
+		}
+
+		#region ISQLFunction Members
+
+		public IType ReturnType(IType columnType, IMapping mapping)
+		{
+			return NHibernateUtil.Int64;
+		}
+
+		public bool HasArguments
+		{
+			get { return true; }
+		}
+
+		public bool HasParenthesesIfNoArguments
+		{
+			get { return true; }
+		}
+
+		public SqlString Render(IList args, ISessionFactoryImplementor factory)
+		{
+			Prepare(args);
+
+			Function(); 
+			OpenParens(); 
+			Arguments(); 
+			CloseParens();
+
+			return _sqlBuffer.ToSqlString();
+		}
+
+		#endregion
+
+		private void Prepare(IList args)
+		{
+			_sqlBuffer = new SqlStringBuilder();
+			_args = new Queue();
+			foreach (var arg in args)
+			{
+				if (!IsParens(arg.ToString()))
+					_args.Enqueue(arg);
+			}
+		}
+
+		private static bool IsParens(string candidate)
+		{
+			return candidate == "(" || candidate == ")";
+		}
+
+		private void Function()
+		{
+			_sqlBuffer.Add(_functionName);
+		}
+
+		private void OpenParens()
+		{
+			_sqlBuffer.Add("(");
+		}
+
+		private void Arguments()
+		{
+			while (_args.Count > 0)
+			{
+				var arg = _args.Dequeue();
+				if (arg is Parameter || arg is SqlString)
+					_sqlBuffer.AddObject(arg);
+				else
+					_sqlBuffer.Add(arg.ToString());
+				if (_args.Count > 0)
+					_sqlBuffer.Add(", ");
+			}
+		}
+
+		private void CloseParens()
+		{
+			_sqlBuffer.Add(")");
+		}
+	}
+}