/// <summary>
/// 获取指定工作流、角色、时间段的实例集合
/// </summary>
/// <param name="workflowName">流程名称</param>
/// <param name="userIdentity">用户身份</param>
/// <param name="role">审批角色</param>
/// <param name="startDate">时间段起始时间</param>
/// <param name="endDate">时间段截止时间</param>
/// <returns></returns>
public InstanceCollection Distill(string workflowName, IUserIdentity userIdentity, ApprovalRole role, DateTime startDate, DateTime endDate)
{
//提取实例集合的过程，先遍历每一个提取者对象进行实例提取，后遍历每个过滤器进行实例过滤，最后返回剩余的实例的集合
InstanceCollection instances = new InstanceCollection();
StateMachineWorkflow workflow = (StateMachineWorkflow)WorkflowRuntime.Current.GetService <IWorkFlowDefinePersistService>().GetWorkflowDefine(workflowName);
foreach (InstanceDistiller distiller in InstanceDistillers)
{
instances.AddRange(distiller.InternalDistill(workflowName, userIdentity, role, startDate, endDate));
}
if (Filters != null)
{
foreach (InstanceFilter filter in Filters)
{
if (filter is IInstanceCollectionFilter)
{
IInstanceCollectionFilter collFilter = (IInstanceCollectionFilter)filter;
collFilter.Filter(instances, role, userIdentity);
}
else
{
for (int i = instances.Count - 1; i >= 0; i--)
{
if (filter.InternalIsMatch(instances[i].Instance, role, userIdentity))
{
instances.RemoveAt(i);
}
}
}
}
}
return(instances);
}
/// <summary>
/// 对一个工作流实例集合进行过滤,将满足条件的去处
/// </summary>
/// <param name="instances">需要被过滤的实例集合</param>
/// <param name="role">角色对象</param>
/// <param name="userIdentity">身份识别标志</param>
/// <returns>满足过滤条件的实例排除后的实例集合对象.</returns>
public InstanceCollection Filter(InstanceCollection instances, ApprovalRole role, IUserIdentity userIdentity)
{
List <ApprovalAssignment> assignmentList = WorkflowRuntime.Current.GetService <IApprovalSaveService>().GetAssignment(instances.InstanceIDs);
for (int i = instances.Count - 1; i >= 0; i--)
{
if (IsOthers(userIdentity, GetAssignment(instances[i], assignmentList)))
{
instances.RemoveAt(i);
}
}
return(instances);
}
