Stored Procedure Invocation Code Generator for VB, C# and JScript.NET

//================================================================================
//
//  Copyright (c) objectnation GmbH, 2002
//
//================================================================================
//
//  Author          simon.wilson
//  Creation Date   17.09.2002
//  Creation Time   16:30:35
//  IDE Version     Microsoft Development Environment Enterprise Edition 7.00
//  OS Version      Microsoft Windows NT 5.1.2600.0
//
//================================================================================

#region Copyright � objectnation GmbH, 2002

// This software is provided 'as-is'. While the greatest care has been taken to 
// ensure that the software functions correctly, no guarantee can be made to this effect.
//
// objectnation grants permission to anyone to use this software for any purpose as long as 
// it is in compliance with the following restrictions:
//
// 1.	This software is the intellectual property and copyright of objectnation GmbH. 
//    Under no circumstances may the origin of the software be misrepresented.
//
// 2.	Should this software be used in the development of a commercial product, 
//    then an acknowledgement in that product's documentation is a requirement. 
//    The following text should be used:
//
//    This product contains code generated by objectnation SP/Invoke, 
//    copyright � objectnation GmbH 2002 (http://www.objectnation.com).
//
// 3.	The software may not be redistributed without the express written permission of 
//    the copyright holder, namely objectnation GmbH, Switzerland.

#endregion

using System;
using System.Collections;
using System.Data.SqlTypes;
using System.CodeDom;
using System.CodeDom.Compiler;

namespace objectnation.SPInvoke
{
	public abstract class ColumnCodeGenerator
	{
		public abstract CodeExpression CreateInitializationExpression();
		public abstract CodeExpression CreateDeserializationExpression(CodeExpression serializationInfoObject, string propName);
		public abstract CodeExpression CreateNullCheckExpression(CodeExpression targetObject);
		public abstract CodeExpression CreateValueExpression(CodeExpression targetObject);
	}

	// ===========================================================================

	public class DefaultColumnCodeGenerator : ColumnCodeGenerator
	{
		Type _type;
		Type _sqlType;

		// ===========================================================================

		public DefaultColumnCodeGenerator(Type type, Type sqlType)
		{
			_type = type;
			_sqlType = sqlType;
		}

		// ===========================================================================

		public override CodeExpression CreateInitializationExpression()
		{
			return new CodeFieldReferenceExpression(
				new CodeTypeReferenceExpression(_sqlType), "Null");
		}

		// ===========================================================================

		public override CodeExpression CreateDeserializationExpression(
			CodeExpression serializationInfoObject, 
			string propName)
		{
			CodeExpression [] parameters =
			{
				new CodePrimitiveExpression(propName),
				new CodeTypeOfExpression(_type)
			};

			CodeMethodInvokeExpression invoke = new CodeMethodInvokeExpression(serializationInfoObject, "GetValue", parameters);
			return new CodeObjectCreateExpression(_sqlType, new CodeCastExpression(_type, invoke));
		}

		// ===========================================================================

		public override CodeExpression CreateNullCheckExpression(
			CodeExpression targetObject)
		{
			return new CodePropertyReferenceExpression(targetObject, "IsNull");
		}

		// ===========================================================================

		public override CodeExpression CreateValueExpression(
			CodeExpression targetObject)
		{
			return new CodePropertyReferenceExpression(targetObject, "Value");
		}
	}

	// ===========================================================================

	public class ObjectColumnCodeGenerator : DefaultColumnCodeGenerator
	{
		public ObjectColumnCodeGenerator() : base(typeof(object), typeof(object)) {}

		// ===========================================================================

		public override CodeExpression CreateInitializationExpression()
		{
			return new CodePrimitiveExpression(null);
		}

		// ===========================================================================

		public override CodeExpression CreateDeserializationExpression(
			CodeExpression serializationInfoObject, 
			string propName)
		{
			CodeExpression [] parameters =
			{
				new CodePrimitiveExpression(propName),
				new CodeTypeOfExpression(typeof(object))
			};

			return new CodeMethodInvokeExpression(serializationInfoObject, "GetValue", parameters);
		}

		// ===========================================================================

		public override CodeExpression CreateNullCheckExpression(
			CodeExpression targetObject)
		{
			CodeExpression expression = null;
			expression = new CodeBinaryOperatorExpression(
				targetObject, 
				CodeBinaryOperatorType.IdentityEquality, 
				new CodePrimitiveExpression(null));

			return new CodeCastExpression(typeof(bool), expression);
		}

		// ===========================================================================

		public override CodeExpression CreateValueExpression(
			CodeExpression targetObject)
		{
			return targetObject;
		}
	}

	// =============================================================================

	public class ColumnCodeGeneratorFactory
	{
		public static ColumnCodeGenerator Create(Type type, Type sqlType)
		{
			if(type == typeof(object))
				return new ObjectColumnCodeGenerator();
			else
				return new DefaultColumnCodeGenerator(type, sqlType);
		}
	}
}