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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<TransitionInfo> ParseStateMachine(StateActivity rootState)
{
List<TransitionInfo> transitions = new List<TransitionInfo>();
Dictionary<string, StateActivity> states = new Dictionary<string, StateActivity>();
Queue<StateActivity> processingQueue = new Queue<StateActivity>();
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<TransitionInfo> transitions)
{
Queue<Activity> processingQueue = new Queue<Activity>();
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);
}
}
}
}
}
}
}
}
|
