public static T CreateNumberedProjectChild <T>(Project project)
where T : EntityBase, IAggregateRoot, INumberedProjectChild
{
// Initialize the NumberedProjectChild return value
T newNumberedProjectChild = default(T);
// Get the correct repository using the Repository Factory
INumberedProjectChildRepository <T> repository =
RepositoryFactory.GetRepository
<INumberedProjectChildRepository <T>, T>();
// Get all of the items in the Aggregate from the FindBy method
IList <T> numberedProjectChildren = repository.FindBy(project);
// Use LINQ to get the last numbered item in the list
// and increment it by 1
int newNumber = numberedProjectChildren.Last().Number + 1;
// Create the instance, passing in the projectKey value as well
// as the new number to the constructor of the INumberedProjectChild
// instance, and then casting it to the correct type (T)
newNumberedProjectChild = Activator.CreateInstance(typeof(T),
new object[] { project.Key, newNumber }) as T;
// Return the newly initialized object
return(newNumberedProjectChild);
}
public override bool IsSatisfiedBy(TCandidate candidate)
{
bool isSatisfiedBy = true;
// Make sure that the same entity number has not
// been used for the current project, and that there are no
// gaps between entity numbers
// First get the project associated with the entity
Project project = ProjectService.GetProject(candidate.ProjectKey);
// Next get the list of items for the project
// First get the correct Repository
INumberedProjectChildRepository <TCandidate> repository =
RepositoryFactory.GetRepository
<INumberedProjectChildRepository <TCandidate>, TCandidate>();
// Now use the Repository to find all of the items by the Project
IList <TCandidate> items = repository.FindBy(project);
// Find out if this is a new Entity or an existing one
// No need to proceed if it already exists
if (items.Where(item => item.Key.Equals(candidate.Key)).Count() == 0)
{
// Use a LINQ query to determine if the entity number has been
// used before
isSatisfiedBy =
(items.Where(item => item.Number.Equals(candidate.Number)).Count()
< 1);
// See if the candidate passed the first test
if (isSatisfiedBy)
{
// First test passed, now use another LINQ query to make sure that
// there are no gaps
isSatisfiedBy =
(candidate.Number - items.Max(item => item.Number) == 1);
}
}
return(isSatisfiedBy);
}
