StateDesigner.TransitionInfo.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / WF / Activities / Designers / StateDesigner.TransitionInfo.cs / 1305376 / StateDesigner.TransitionInfo.cs

                            namespace System.Workflow.Activities 
{
    using System;
    using System.Text;
    using System.Reflection; 
    using System.Collections;
    using System.Collections.Generic; 
    using System.Collections.ObjectModel; 
    using System.CodeDom;
    using System.ComponentModel; 
    using System.ComponentModel.Design;
    using System.Drawing.Design;
    using System.Drawing;
    using System.Drawing.Drawing2D; 
    using System.Diagnostics;
    using System.IO; 
    using System.Windows.Forms; 
    using System.Workflow.ComponentModel;
    using System.Workflow.ComponentModel.Design; 
    using System.Runtime.Serialization;

    internal partial class StateDesigner : FreeformActivityDesigner
    { 
        internal class TransitionInfo
        { 
            private SetStateActivity _setState; 
            private CompositeActivity _eventHandler;
            private StateActivity _targetState; 
            private StateDesignerConnector _connector;

            internal TransitionInfo(SetStateActivity setState, CompositeActivity eventHandler)
            { 
                if (setState == null)
                    throw new ArgumentNullException("setState"); 
                if (eventHandler == null) 
                    throw new ArgumentNullException("eventHandler");
                _setState = setState; 
                _eventHandler = eventHandler;
            }

            internal SetStateActivity SetState 
            {
                get 
                { 
                    return _setState;
                } 
            }

            internal CompositeActivity EventHandler
            { 
                get
                { 
                    return _eventHandler; 
                }
            } 

            internal StateActivity SourceState
            {
                get 
                {
                    if (_eventHandler == null) 
                        return null; 

                    StateActivity sourceState = _eventHandler.Parent as StateActivity; 
                    return sourceState;
                }
            }
 
            internal StateActivity TargetState
            { 
                get 
                {
                    return _targetState; 
                }
                set
                {
                    _targetState = value; 
                }
            } 
 
            internal StateDesignerConnector Connector
            { 
                get
                {
                    return _connector;
                } 
                set
                { 
                    _connector = value; 
                }
            } 

            internal bool Matches(StateDesignerConnector stateDesignerConnector)
            {
                if (stateDesignerConnector == null) 
                    throw new ArgumentNullException("stateDesignerConnector");
 
                if (this.Connector != null && 
                    this.Connector == stateDesignerConnector)
                    return true; 

                // this transitioninfo is incomplete,
                // therefore, it cannot match an existing connector
                if (this.SetState == null || 
                    this.SourceState == null ||
                    this.TargetState == null || 
                    this.EventHandler == null) 
                    return false;
 
                if (this.SetState.QualifiedName != stateDesignerConnector.SetStateName)
                    return false;

                if (this.SourceState.QualifiedName != stateDesignerConnector.SourceStateName) 
                    return false;
 
                if (this.TargetState.QualifiedName != stateDesignerConnector.TargetStateName || 
                    stateDesignerConnector.Target.AssociatedDesigner.Activity.QualifiedName != stateDesignerConnector.TargetStateName)
                    return false; 

                if (this.EventHandler.QualifiedName != stateDesignerConnector.EventHandlerName)
                    return false;
 
                return true;
            } 
 
            internal static ReadOnlyCollection ParseStateMachine(StateActivity rootState)
            { 
                List transitions = new List();
                Dictionary states = new Dictionary();
                Queue processingQueue = new Queue();
                processingQueue.Enqueue(rootState); 
                while (processingQueue.Count > 0)
                { 
                    StateActivity state = processingQueue.Dequeue(); 
                    states[state.QualifiedName] = state;
                    foreach (Activity childActivity in state.Activities) 
                    {
                        StateActivity childState = childActivity as StateActivity;
                        if (childState == null)
                        { 
                            CompositeActivity compositeChild = childActivity as CompositeActivity;
                            if (compositeChild != null) 
                                ParseEventHandler(compositeChild, transitions); 
                        }
                        else 
                        {
                            processingQueue.Enqueue(childState);
                        }
                    } 
                }
 
                foreach (TransitionInfo transitionInfo in transitions) 
                {
                    StateActivity targetState; 
                    string targetStateName = transitionInfo.SetState.TargetStateName;
                    if (!String.IsNullOrEmpty(targetStateName))
                    {
                        states.TryGetValue(transitionInfo.SetState.TargetStateName, out targetState); 
                        transitionInfo.TargetState = targetState;
                    } 
                } 

                return transitions.AsReadOnly(); 
            }

            private static void ParseEventHandler(CompositeActivity eventHandler, List transitions)
            { 
                Queue processingQueue = new Queue();
                processingQueue.Enqueue(eventHandler); 
                while (processingQueue.Count > 0) 
                {
                    Activity activity = processingQueue.Dequeue(); 
                    SetStateActivity setState = activity as SetStateActivity;
                    if (setState != null)
                    {
                        TransitionInfo transitionInfo = new TransitionInfo(setState, eventHandler); 
                        transitions.Add(transitionInfo);
                    } 
                    else 
                    {
                        CompositeActivity compositeActivity = activity as CompositeActivity; 
                        if (compositeActivity != null)
                        {
                            foreach (Activity childActivity in compositeActivity.Activities)
                            { 
                                processingQueue.Enqueue(childActivity);
                            } 
                        } 
                    }
                } 
            }
        }
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
                        

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