public static IZooDatabase FromFile(IRandomizer randomizer, IAnimalNamesDatabase animalNamesDatabase, string filename, bool createIfNotExist = true)
{
var database = new ZooDatabase(randomizer, animalNamesDatabase, filename);
if (createIfNotExist &&
!File.Exists(filename))
{
database.Save(); // force generate an empty database file
return(database);
}
var doc = new XmlDocument();
doc.Load(filename);
foreach (XmlNode node in doc.SelectNodes("Zoo/Animals/Animal"))
{
// attempt to find the animal type by full name
var type = Assembly.GetExecutingAssembly().GetType(node.Attributes["Type"].InnerText);
if (type != null)
{
var id = Guid.Parse(node.Attributes["Id"].InnerText);
var name = node.Attributes["Name"].InnerText;
var age = new TimeSpan(long.Parse(node.Attributes["Age"].InnerText));
// construct an instance of the animal
var animal = ConstructAnimal(type, id, name, age);
// add animal to database (not saved yet)
database._animals.Add(animal.Id, animal);
}
}
return(database);
}
private ZooDatabase(IRandomizer randomizer, IAnimalNamesDatabase animalNamesDatabase, string filename)
{
_randomizer = randomizer;
_animalNamesDatabase = animalNamesDatabase;
_filename = filename;
}