/// <summary> Creates a new task. </summary>
public StudyTask(IStudyTasksService client, string name, string userId, TimeSpan estimate)
{
if (client == null)
{
throw new ArgumentNullException(nameof(client));
}
if (string.IsNullOrWhiteSpace(name))
{
throw new ArgumentException(nameof(name));
}
if (userId == null)
{
throw new ArgumentNullException(nameof(userId));
}
this.MessageObject = new StudyTaskService()
{
Name = name, UserId = userId, Estimate = estimate
};
this.service = client;
this.Name = name;
this.Estimate = estimate;
this.TimeSpans = new ObservableCollection <TaskTimeSpan>();
this.TimeSpans.CollectionChanged += OnTimeSpansChanged;
this.PropertyChanged += OnPropertyChanged;
}
/// <summary> Creates a <see cref="StudyTask"/> instance representing an already existing task in the database. </summary>
public StudyTask(IStudyTasksService service, StudyTaskService task)
{
if (service == null)
{
throw new ArgumentNullException(nameof(service));
}
if (task == null)
{
throw new ArgumentNullException(nameof(task));
}
if (task.Id == 0)
{
throw new ArgumentException();
}
if (task.UserId == null)
{
throw new ArgumentNullException(nameof(task.UserId));
}
this.MessageObject = task;
this.service = service;
this.Name = this.MessageObject.Name;
this.Estimate = this.MessageObject.Estimate;
//retrieve time spans from database:
var timeSpans = service.GetTimeSpansFor(task.Id).Select(timeSpanDB => new TaskTimeSpan(service, timeSpanDB, this));
this.TimeSpans = new ObservableCollection <TaskTimeSpan>(timeSpans);
this.TimeSpans.CollectionChanged += OnTimeSpansChanged;
this.PropertyChanged += OnPropertyChanged;
}
/// <summary> Creates a <see cref="TaskTimeSpan"/> from database. </summary>
/// <param name="messageObject"> The autogenerated message object representing a time span in the database. </param>
public TaskTimeSpan(IStudyTasksService service, TaskTimeSpanService messageObject, StudyTask task)
{
if (messageObject == null)
{
throw new ArgumentNullException(nameof(messageObject));
}
if (task == null)
{
throw new ArgumentNullException(nameof(task));
}
if (service == null)
{
throw new ArgumentNullException(nameof(service));
}
if (messageObject.Id == 0)
{
throw new ArgumentException();
}
this.service = service;
this.timeSpanMessageObject = messageObject;
this.Task = task;
this.Start = messageObject.Start;
this.End = messageObject.End;
this.PropertyChanged += OnPropertyChanged;
}
/// <summary> Creates an empty study tasks collection that is linked to the database. </summary>
public static StudyTaskCollection Create(IStudyTasksService client)
{
if (client == null)
{
throw new ArgumentNullException(nameof(client));
}
return(new StudyTaskCollection(client, Enumerable.Empty <StudyTask>()));
}
private StudyTaskCollection(IStudyTasksService client, IEnumerable <StudyTask> initialTasks) : base(initialTasks)
{
if (client == null)
{
throw new ArgumentNullException(nameof(client));
}
this.client = client;
this.CollectionChanged += OnTasksChanged;
}
/// <summary> Gets a study tasks collection from all tasks in the database. </summary>
public static StudyTaskCollection FromDatabase(IStudyTasksService client, string userId)
{
if (client == null)
{
throw new ArgumentNullException(nameof(client));
}
var tasksFromDatabase = client.GetAllTasksOfUser(userId)
.Select(taskService => new StudyTask(client, taskService))
.ToList();
return(new StudyTaskCollection(client, tasksFromDatabase));
}
/// <remarks> This ctor should not add this instance to the database because the <see cref="StudyTask.TimeSpans.CollectionChanged"/> is responsible for that. </remarks>
public TaskTimeSpan(IStudyTasksService service, StudyTask task, DateTime start)
{
if (task == null)
{
throw new ArgumentNullException(nameof(task));
}
if (service == null)
{
throw new ArgumentNullException(nameof(service));
}
this.service = service;
this.timeSpanMessageObject = new TaskTimeSpanService()
{
Start = start, TaskId = task.Id
};
this.Task = task;
this.Start = start;
this.PropertyChanged += OnPropertyChanged;
}
public static TaskTimeSpanService ToService(this TaskTimeSpan timeSpan, IStudyTasksService service)
{
if (service == null)
{
throw new ArgumentNullException(nameof(service));
}
var task = service.GetTask(timeSpan.TaskId);
if (task == null)
{
throw new ArgumentException($"A task with Id {timeSpan.TaskId} does not exist in the database", nameof(timeSpan));
}
return(new TaskTimeSpanService
{
Id = timeSpan.Id,
Start = timeSpan.Start,
End = timeSpan.End,
TaskId = timeSpan.TaskId
});
}
/// <summary> Creates a <see cref="StudyTask"/> instance representing an already existing task in the database. </summary>
/// <param name="taskId"> The id of the task in the database to fetch. </param>
public StudyTask(IStudyTasksService service, int taskId)
: this(service, service.GetTask(taskId))
{
Contract.Assert(this.MessageObject.Id == taskId);
}