A .NET State Machine Toolkit - Part III

/*
 * Created by: Leslie Sanford
 * 
 * Contact: jabberdabber@hotmail.com
 * 
 * Last modified: 09/16/2005
 */

using System;
using System.CodeDom;
using System.Data;

namespace StateMachineToolkit
{
	/// <summary>
	/// Builds the method responsible for initializing the guard delegates.
	/// </summary>
    internal class GuardInitializeBuilder
	{
        #region GuardInitializeBuilder Members

        #region Fields

        // The guard table.
        private DataTable guardTable;

        // The built method.
        private CodeMemberMethod result = new CodeMemberMethod();

        #endregion

        #region Construction

        /// <summary>
        /// Initializes a new instance of the GuardInitializeBuilder class.
        /// </summary>
        /// <param name="guardTable">
        /// The table of guards from which the GuardHandler delegates are 
        /// initialized.
        /// </param>
		public GuardInitializeBuilder(DataTable guardTable)
		{
            this.guardTable = guardTable;
		}

        #endregion

        #region Methods

        /// <summary>
        /// Builds the method.
        /// </summary>
        public void Build()
        {
            result = new CodeMemberMethod();
            result.Name = "InitializeGuards";
            result.Attributes = MemberAttributes.Private;

            CodeThisReferenceExpression thisReference = new CodeThisReferenceExpression();
            CodeFieldReferenceExpression guardField;
            CodeDelegateCreateExpression delegateCreate;           

            foreach(DataRow row in guardTable.Rows)
            {
                guardField = new CodeFieldReferenceExpression(thisReference,
                    "guard" + row["Name"].ToString());

                delegateCreate = new CodeDelegateCreateExpression(
                    new CodeTypeReference(typeof(GuardHandler)),
                    thisReference, row["Name"].ToString());

                result.Statements.Add(
                    new CodeAssignStatement(guardField, delegateCreate));
            }                        
        }

        #endregion

        #region Properties

        /// <summary>
        /// Gets the built method.
        /// </summary>
        public CodeMemberMethod Result
        {
            get
            {
                return result;
            }
        }

        #endregion

        #endregion
	}
}