change SqlGenerator to use dialect specfic bitwise operations identified as "band", "bor", "bxor" and "bnot" which can be overriden by Subclasses of Dialect

Author: amroel

src/NHibernate/Dialect/Dialect.cs

@@ -113,6 +113,12 @@ protected Dialect()
 			RegisterFunction("month", new SQLFunctionTemplate(NHibernateUtil.Int32, "extract(month from ?1)"));
 			RegisterFunction("year", new SQLFunctionTemplate(NHibernateUtil.Int32, "extract(year from ?1)"));
 
+			//RegisterFunction("band", new SQLFunctionTemplate(NHibernateUtil.Int64, "?1 & ?2"));
+			RegisterFunction("band", new NativeBitwiseOpetration("&"));
+			RegisterFunction("bor", new NativeBitwiseOpetration("|"));
+			RegisterFunction("bxor", new NativeBitwiseOpetration("^"));
+			RegisterFunction("bnot", new NativeBitwiseOpetration("~"));
+
 			RegisterFunction("str", new SQLFunctionTemplate(NHibernateUtil.String, "cast(?1 as char)"));
 
 			// register hibernate types for default use in scalar sqlquery type auto detection

src/NHibernate/Dialect/NativeBitwiseOperation.cs

@@ -0,0 +1,84 @@
+using System;
+using System.Collections;
+using NHibernate.Dialect.Function;
+using NHibernate.Engine;
+using NHibernate.SqlCommand;
+using NHibernate.Type;
+
+namespace NHibernate.Dialect
+{
+	[Serializable]
+	public class NativeBitwiseOperation : ISQLFunction
+	{
+		private readonly string _sqlToken;
+        private Queue _args;
+		private SqlStringBuilder _sqlBuffer;
+
+		public NativeBitwiseOperation(string sqlToken)
+		{
+			_sqlToken = sqlToken;
+		}
+
+		#region ISQLFunction Members
+
+		public IType ReturnType(IType columnType, IMapping mapping)
+		{
+			return NHibernateUtil.Int64;
+		}
+
+		public bool HasArguments
+		{
+			get { return true; }
+		}
+
+		public bool HasParenthesesIfNoArguments
+		{
+			get { return false; }
+		}
+
+		public SqlString Render(IList args, ISessionFactoryImplementor factory)
+		{
+			Prepare(args);
+			if (_sqlToken != "~")
+				AddFirstArgument();
+			AddToken();
+			AddRestOfArguments();
+
+			return _sqlBuffer.ToSqlString();
+		}
+
+		#endregion
+
+		private void Prepare(IList args)
+		{
+			_sqlBuffer = new SqlStringBuilder();
+			_args = new Queue(args);
+		}
+
+		private void AddFirstArgument()
+		{
+			AddToBuffer(_args.Dequeue());
+		}
+
+		private void AddToken()
+		{
+			AddToBuffer(string.Format(" {0} ", _sqlToken));
+		}
+
+		private void AddRestOfArguments()
+		{
+			while (_args.Count > 0)
+			{
+				AddToBuffer(_args.Dequeue());
+			}
+		}
+
+		private void AddToBuffer(object arg)
+		{
+			if (arg is Parameter || arg is SqlString)
+				_sqlBuffer.AddObject(arg);
+			else
+				_sqlBuffer.Add(arg.ToString());
+		}
+	}
+}