Implementing Model-View-Presenter in ASP.NET

using System;
using System.CodeDom.Compiler;
using System.Data;
using Microsoft.CSharp;
using SubSonic.Utilities;

namespace SubSonic
{
	public class CSharpCodeLanguage : ICodeLanguage
	{
		#region Constants & enumerations

		private readonly string[] keywords = {
			// keywords
			"abstract", "as", "base", "bool", "break", "byte", "case", "catch", "char", "checked", "class",
			"const", "continue", "date", "datetime", "decimal", "default", "delegate", "do", "double", "else",
			"enum", "event", "explicit", "extern", "false", "finally", "fixed", "float", "for", "foreach", "goto",
			"if", "implicit", "in", "int", "interface", "internal", "is", "lock", "long", "namespace", "new",
			"null", "object", "operator", "out", "override", "params", "private", "protected", "public", "readonly",
			"ref", "return", "sbyte", "sealed", "short", "sizeof", "stackalloc", "static", "string", "struct",
			"switch", "this", "throw", "true", "try", "typeof", "uint", "ulong", "unchecked", "unsafe", "ushort",
			"using", "virtual", "volatile", "void", "while",
			// contextual keywords
			"get", "partial", "set", "value", "where", "yield"
		};

		#endregion

		#region Properties

		public string CodeProvider
		{
			get { return "CSharpCodeProvider"; }
		}

		public string FileExtension
		{
			get { return SubSonic.FileExtension.DOT_CS; }
		}

		public string  Identifier
		{
			get { return "C#"; }
		}

		public string ShortName
		{
			get { return "cs"; }
		}

		public string TemplatePrefix
		{
			get { return "CS_"; }
		}

		#endregion

		#region Methods

		public CodeDomProvider CreateCodeProvider()
		{
			return new CSharpCodeProvider();
		}

		public string GetDefaultValue(string colName, DbType dbType, bool isNullableColumn)
		{
			string variableType = GetDefaultValue(colName, dbType);
			if (isNullableColumn && Utility.IsNullableDbType(dbType))
				variableType = variableType + CodeFragment.NULLABLE_VARIABLE;
			return variableType;
		}

		public string GetUsingStatements(string[] namespaces)
		{
			string usingStatements = "";
			foreach (string space in namespaces)
				usingStatements += "using " + space + ";" + Environment.NewLine;
			return usingStatements;
		}

		public string GetVariableType(DbType dbType, bool isNullableColumn)
		{
			string variableType = GetVariableType(dbType);
			if (isNullableColumn && Utility.IsNullableDbType(dbType))
				variableType = variableType + CodeFragment.NULLABLE_VARIABLE;
			return variableType;
		}

		public bool IsKeyword(string word)
		{
			return Array.IndexOf(keywords, word.ToLower()) != -1;
		}

		#endregion

		#region Private methods

		private static string GetDefaultValue(string colName, DbType dbType)
		{
			if (Utility.IsLogicalDeleteColumn(colName))
				return "false";

			switch (dbType) {
				case DbType.Guid:
					// HACK: GUID fix
					return "Guid.Empty";
				case DbType.AnsiString:
				case DbType.AnsiStringFixedLength:
				case DbType.String:
				case DbType.StringFixedLength:
					return "null";
				case DbType.Boolean:
					return "false";
				case DbType.Binary:
					return "null";
				case DbType.Xml:
					return "";
				case DbType.Date:
				case DbType.DateTime: {
						return "new DateTime(1900,01, 01)";
					}
				default:
					return "0";
			}
		}

		private static string GetVariableType(DbType dbType)
		{
			switch (dbType) {
				case DbType.AnsiString:
				case DbType.AnsiStringFixedLength:
				case DbType.String:
				case DbType.StringFixedLength: return "string";

				case DbType.Binary:		return "byte[]";
				case DbType.Boolean:	return "bool";
				case DbType.Byte:		return "byte";

				case DbType.Currency:
				case DbType.Decimal:
				case DbType.VarNumeric:	return "decimal";

				case DbType.Date:
				case DbType.DateTime:	return "DateTime";

				case DbType.Double:		return "double";
				case DbType.Guid:		return "Guid";
				case DbType.Int16:		return "short";
				case DbType.Int32:		return "int";
				case DbType.Int64:		return "long";
				case DbType.Object:		return "object";
				case DbType.SByte:		return "sbyte";
				case DbType.Single:		return "float";
				case DbType.Time:		return "TimeSpan";
				case DbType.UInt16:		return "ushort";
				case DbType.UInt32:		return "uint";
				case DbType.UInt64:		return "ulong";

				default:				return "string";
			}
		}

		#endregion
	}
}