A .NET State Machine Toolkit - Part III

/*
 * Created by: Leslie Sanford
 * 
 * Contact: jabberdabber@hotmail.com
 * 
 * Last modified: 09/13/2005
 */

using System;
using System.CodeDom;

namespace StateMachineToolkit
{
	/// <summary>
	/// Builds the state machine's constructor.
	/// </summary>
	internal class ConstructorBuilder
	{
        #region ConstructorBuilder Members

        #region Fields

        // The state machine's initial state.
        private string initialState = string.Empty;

        // The built constructor.
        private CodeConstructor result = new CodeConstructor();

        #endregion        

        #region Methods

        /// <summary>
        /// Builds the constructor.
        /// </summary>
        public void Build()
        {
            result = new CodeConstructor();

            result.Attributes = MemberAttributes.Public;
            result.Parameters.Add(new CodeParameterDeclarationExpression(
                typeof(EventQueue), "queue"));
            result.BaseConstructorArgs.Add(
                new CodeArgumentReferenceExpression("queue"));

            CodeThisReferenceExpression thisReference = new CodeThisReferenceExpression();
            CodeMethodInvokeExpression methodInvoke = new CodeMethodInvokeExpression();

            methodInvoke.Method.TargetObject = thisReference;
            methodInvoke.Method.MethodName = "InitializeStates";

            result.Statements.Add(methodInvoke);

            methodInvoke = new CodeMethodInvokeExpression();

            methodInvoke.Method.TargetObject = thisReference;
            methodInvoke.Method.MethodName = "InitializeGuards";

            result.Statements.Add(methodInvoke);

            methodInvoke = new CodeMethodInvokeExpression();

            methodInvoke.Method.TargetObject = thisReference;
            methodInvoke.Method.MethodName = "InitializeActions";

            result.Statements.Add(methodInvoke);

            methodInvoke = new CodeMethodInvokeExpression();

            methodInvoke.Method.TargetObject = thisReference;
            methodInvoke.Method.MethodName = "InitializeTransitions";

            result.Statements.Add(methodInvoke);

            methodInvoke = new CodeMethodInvokeExpression();

            methodInvoke.Method.TargetObject = thisReference;
            methodInvoke.Method.MethodName = "InitializeRelationships";

            result.Statements.Add(methodInvoke);

            methodInvoke = new CodeMethodInvokeExpression();

            methodInvoke.Method.TargetObject = thisReference;
            methodInvoke.Method.MethodName = "InitializeHistoryTypes";

            result.Statements.Add(methodInvoke);

            methodInvoke = new CodeMethodInvokeExpression();

            methodInvoke.Method.TargetObject = thisReference;
            methodInvoke.Method.MethodName = "InitializeInitialStates";

            result.Statements.Add(methodInvoke);

            CodeExpression[] parameters = 
                {
                    new CodeFieldReferenceExpression(thisReference,
                    "state" + InitialState) 
                };

            CodeMethodInvokeExpression initializeInvoke = 
                new CodeMethodInvokeExpression(thisReference,
                "Initialize", parameters);

            result.Statements.Add(initializeInvoke);
        }

        #endregion

        #region Properties

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

        /// <summary>
        /// Gets or sets the state machine's initial state.
        /// </summary>
        public string InitialState
        {
            get
            {
                return initialState;
            }
            set
            {
                initialState = value;
            }
        }

        #endregion

        #endregion
	}
}