/// <summary>
/// 根据Transition，获取下一步节点列表
/// </summary>
/// <param name="nextActivityList"></param>
/// <param name="processInstanceID"></param>
/// <param name="currentGatewayActivity"></param>
/// <param name="forwardTransition"></param>
/// <param name="conditionKeyValuePair"></param>
protected NextActivityComponent GetNextActivityListFromGatewayCore(TransitionEntity forwardTransition,
IDictionary<string, string> conditionKeyValuePair,
out NextActivityMatchedType resultType)
{
NextActivityComponent child = null;
if (forwardTransition.ToActivity.ActivityType == ActivityTypeEnum.TaskNode
|| forwardTransition.ToActivity.ActivityType == ActivityTypeEnum.EndNode)
{
child = NextActivityComponentFactory.CreateNextActivityComponent(forwardTransition, forwardTransition.ToActivity);
resultType = NextActivityMatchedType.Successed;
}
else if (forwardTransition.ToActivity.ActivityType == ActivityTypeEnum.GatewayNode)
{
child = GetNextActivityListFromGateway(forwardTransition,
forwardTransition.ToActivity,
conditionKeyValuePair,
out resultType);
}
else
{
resultType = NextActivityMatchedType.Failed;
throw new XmlDefinitionException(string.Format("未知的节点类型：{0}", forwardTransition.ToActivity.ActivityType.ToString()));
}
return child;
}
/// <summary>
/// 创建下一步活动的节点
/// </summary>
/// <param name="activity"></param>
/// <returns></returns>
internal static NextActivityComponent CreateNextActivityComponent(TransitionEntity transition,
ActivityEntity activity)
{
NextActivityComponent component = null;
if (activity.ActivityType == ActivityTypeEnum.TaskNode
|| activity.ActivityType == ActivityTypeEnum.EndNode)
{
string name = "单一节点";
component = new NextActivityItem(name, transition, activity);
}
else
{
string name = string.Empty;
if (activity.GatewayDirectionType == Slickflow.Engine.Common.GatewayDirectionEnum.AndSplit)
{
name = "必全选节点";
}
else
{
name = "或多选节点";
}
component = new NextActivityGateway(name, transition, activity);
}
return component;
}
public NextActivityGateway(string name,
TransitionEntity transition,
ActivityEntity activity)
{
base.Name = name;
base.Transition = transition;
base.Activity = activity;
}
/// <summary>
/// 把子节点添加到网关路由节点，根据网关节点和子节点是否为空处理
/// </summary>
/// <param name="gatewayComponent"></param>
/// <param name="child"></param>
/// <param name="currentGatewayActivity"></param>
/// <returns></returns>
protected NextActivityComponent AddChildToGatewayComponent(TransitionEntity fromTransition,
ActivityEntity currentGatewayActivity,
NextActivityComponent gatewayComponent,
NextActivityComponent child)
{
if ((gatewayComponent == null) && (child != null))
gatewayComponent = NextActivityComponentFactory.CreateNextActivityComponent(fromTransition, currentGatewayActivity);
if ((gatewayComponent != null) && (child != null))
gatewayComponent.Add(child);
return gatewayComponent;
}
/// <summary>
/// 获取下一步节点列表
/// </summary>
/// <param name="processInstanceID"></param>
/// <param name="fromTransition"></param>
/// <param name="currentGatewayActivity"></param>
/// <param name="conditionKeyValuePair"></param>
/// <returns></returns>
internal override NextActivityComponent GetNextActivityListFromGateway(TransitionEntity fromTransition,
ActivityEntity currentGatewayActivity,
IDictionary<string, string> conditionKeyValuePair,
out NextActivityMatchedType resultType)
{
NextActivityComponent child = null;
NextActivityComponent gatewayComponent = null;
resultType = NextActivityMatchedType.Unknown;
//直接取出下步列表，运行时再根据条件执行
List<TransitionEntity> transitionList = base.ProcessModel.GetForwardTransitionList(currentGatewayActivity.ActivityGUID).ToList();
foreach (TransitionEntity transition in transitionList)
{
child = GetNextActivityListFromGatewayCore(transition,
conditionKeyValuePair,
out resultType);
gatewayComponent = AddChildToGatewayComponent(fromTransition, currentGatewayActivity, gatewayComponent, child);
}
return gatewayComponent;
}
/// <summary>
/// 获取下一步节点列表
/// </summary>
/// <param name="processInstanceID"></param>
/// <param name="fromTransition"></param>
/// <param name="currentGatewayActivity"></param>
/// <param name="conditionKeyValuePair"></param>
/// <returns></returns>
internal override NextActivityComponent GetNextActivityListFromGateway(TransitionEntity fromTransition,
ActivityEntity currentGatewayActivity,
IDictionary<string, string> conditionKeyValuePair,
out NextActivityMatchedType resultType)
{
NextActivityComponent child = null;
NextActivityComponent gatewayComponent = null;
resultType = NextActivityMatchedType.Unknown;
var transitionList = this.ProcessModel.GetForwardTransitionList(currentGatewayActivity.ActivityGUID).ToList();
if (currentGatewayActivity.GatewayDirectionType == GatewayDirectionEnum.AndSplit)
{
//判读连线上的条件是否都满足，如果都满足才可以取出后续节点列表
bool isCheckedOk = base.ProcessModel.CheckAndSplitOccurrenceCondition(transitionList, conditionKeyValuePair);
if (isCheckedOk)
{
//获取AndSplit的每一条后续连线上的To节点
foreach (TransitionEntity transition in transitionList)
{
child = GetNextActivityListFromGatewayCore(transition,
conditionKeyValuePair,
out resultType);
gatewayComponent = AddChildToGatewayComponent(fromTransition, currentGatewayActivity, gatewayComponent, child);
}
}
if (gatewayComponent == null)
{
resultType = NextActivityMatchedType.WaitingForSplitting;
}
}
else if (currentGatewayActivity.GatewayDirectionType == GatewayDirectionEnum.OrSplit)
{
//获取OrSplit的，满足条件的后续连线上的To节点
foreach (TransitionEntity transition in transitionList)
{
bool isValidTransition = base.ProcessModel.IsValidTransition(transition, conditionKeyValuePair);
if (isValidTransition)
{
child = GetNextActivityListFromGatewayCore(transition,
conditionKeyValuePair,
out resultType);
gatewayComponent = AddChildToGatewayComponent(fromTransition, currentGatewayActivity, gatewayComponent, child);
}
if (gatewayComponent == null)
{
resultType = NextActivityMatchedType.NoneTransitionMatchedToSplit;
}
}
}
else if (currentGatewayActivity.GatewayDirectionType == GatewayDirectionEnum.XOrSplit)
{
//按连线定义的优先级排序
transitionList.Sort(new TransitionPriorityCompare());
//获取XOrSplit的，第一条满足条件的后续连线上的To节点
foreach (TransitionEntity transition in transitionList)
{
bool isValidTransitionXOr = base.ProcessModel.IsValidTransition(transition, conditionKeyValuePair);
if (isValidTransitionXOr)
{
child = GetNextActivityListFromGatewayCore(transition,
conditionKeyValuePair,
out resultType);
gatewayComponent = AddChildToGatewayComponent(fromTransition, currentGatewayActivity, gatewayComponent, child);
//退出循环
break;
}
}
if (gatewayComponent == null)
{
resultType = NextActivityMatchedType.NoneTransitionMatchedToSplit;
}
}
else if (currentGatewayActivity.GatewayDirectionType == GatewayDirectionEnum.ComplexSplit)
{
resultType = NextActivityMatchedType.Failed;
throw new Exception("ComplexSplit 没有具体实现！");
}
else
{
resultType = NextActivityMatchedType.Failed;
throw new Exception("Split 分支节点的类型不明确！");
}
return gatewayComponent;
}
/// <summary>
/// 根据网关类型获取下一步节点列表的抽象方法
/// </summary>
/// <param name="processInstanceID"></param>
/// <param name="transition"></param>
/// <param name="activity"></param>
/// <param name="conditionKeyValuePair"></param>
/// <returns></returns>
internal abstract NextActivityComponent GetNextActivityListFromGateway(TransitionEntity transition,
ActivityEntity activity,
IDictionary<string, string> conditionKeyValuePair,
out NextActivityMatchedType scheduleStatus);
public static TransitionEntity CreateJumpforwardEmptyTransition(ActivityEntity fromActivity, ActivityEntity toActivity)
{
TransitionEntity transition = new TransitionEntity();
transition.TransitionGUID = string.Empty;
transition.FromActivity = fromActivity;
transition.FromActivityGUID = fromActivity.ActivityGUID;
transition.ToActivity = toActivity;
transition.ToActivityGUID = toActivity.ActivityGUID;
transition.DirectionType = TransitionDirectionTypeEnum.Forward;
return transition;
}
/// <summary>
/// 是否是满足条件的Transition，如果条件为空，默认是有效的。
/// </summary>
/// <param name="forwardTransition"></param>
/// <param name="conditionKeyValuePair"></param>
/// <returns></returns>
internal bool IsValidTransition(TransitionEntity transition,
IDictionary<string, string> conditionKeyValuePair)
{
bool isValid = false;
if (transition.Condition != null && !string.IsNullOrEmpty(transition.Condition.ConditionText))
{
if (conditionKeyValuePair != null)
{
isValid = ParseCondition(transition, conditionKeyValuePair);
}
}
else
{
//流程节点上定义的条件为空，则认为连线是可到达的
isValid = true;
}
return isValid;
}
/// <summary>
/// 把XML节点转换为ActivityEntity实体对象
/// </summary>
/// <param name="node"></param>
/// <returns></returns>
internal TransitionEntity ConvertXmlTransitionNodeToTransitionEntity(XmlNode node)
{
//构造转移的基本属性
TransitionEntity entity = new TransitionEntity();
entity.TransitionGUID = XMLHelper.GetXmlAttribute(node, "id");
entity.FromActivityGUID = XMLHelper.GetXmlAttribute(node, "from");
entity.ToActivityGUID = XMLHelper.GetXmlAttribute(node, "to");
if (!string.IsNullOrEmpty(XMLHelper.GetXmlAttribute(node, "direction")))
{
entity.DirectionType = (TransitionDirectionTypeEnum)Enum.Parse(typeof(TransitionDirectionTypeEnum),
XMLHelper.GetXmlAttribute(node, "direction"));
}
//构造活动节点的实体对象
entity.FromActivity = GetActivity(entity.FromActivityGUID);
entity.ToActivity = GetActivity(entity.ToActivityGUID);
//构造转移的条件节点
XmlNode conditionNode = node.SelectSingleNode("Condition");
if (conditionNode != null)
{
entity.Condition = new ConditionEntity();
if (!string.IsNullOrEmpty(XMLHelper.GetXmlAttribute(conditionNode, "type")))
{
entity.Condition.ConditionType = (ConditionTypeEnum)Enum.Parse(typeof(ConditionTypeEnum),
XMLHelper.GetXmlAttribute(conditionNode, "type"));
}
if ((conditionNode.SelectSingleNode("ConditionText") != null)
&& !string.IsNullOrEmpty(XMLHelper.GetXmlNodeValue(conditionNode, "ConditionText")))
{
entity.Condition.ConditionText = XMLHelper.GetXmlNodeValue(conditionNode, "ConditionText");
}
}
//构造转移的行为节点
XmlNode groupBehaviourNode = node.SelectSingleNode("GroupBehaviour");
if (groupBehaviourNode != null)
{
entity.GroupBehaviour = new GroupBehaviourEntity();
if (!string.IsNullOrEmpty(XMLHelper.GetXmlAttribute(groupBehaviourNode, "priority")))
{
entity.GroupBehaviour.Priority = short.Parse(XMLHelper.GetXmlAttribute(groupBehaviourNode, "priority"));
}
if (!string.IsNullOrEmpty(XMLHelper.GetXmlAttribute(groupBehaviourNode, "parallelOption")))
{
entity.GroupBehaviour.ParallelOption = (ParallelOptionEnum)Enum.Parse(typeof(ParallelOptionEnum),
XMLHelper.GetXmlAttribute(groupBehaviourNode, "parallelOption"));
}
}
return entity;
}
/// <summary>
/// 用LINQ解析条件表达式
/// </summary>
/// <param name="transition"></param>
/// <param name="conditionKeyValuePair"></param>
/// <returns></returns>
private bool ParseCondition(TransitionEntity transition, IDictionary<string, string> conditionKeyValuePair)
{
string expression = transition.Condition.ConditionText;
string expressionReplaced = ReplaceParameterToValue(expression, conditionKeyValuePair);
Expression e = System.Linq.Dynamic.DynamicExpression.Parse(typeof(Boolean), expressionReplaced);
LambdaExpression LE = Expression.Lambda(e);
Func<bool> testMe = (Func<bool>)LE.Compile();
bool result = testMe();
return result;
}
