public void Convert()
{
// Arrange: create a world model.
var world = new World();
var spitfire = new Fighter { Name = "Spitfire", PositionX = 100, PositionY = 200, Rotation = 45 };
var stuka = new Fighter { Name = "Stuka", PositionX = 300, PositionY = 400, Rotation = 90, Target = spitfire };
world.Fighters.Add(spitfire);
world.Fighters.Add(stuka);
// Act: convert to view model.
var mainContext = new MainContext(null);
var worldContext = new WorldContext(mainContext, world);
// Assert: verify view model
Assert.IsNotNull(worldContext.Fighters);
Assert.AreEqual(2, worldContext.Fighters.Count);
FighterContext spitfireContext = worldContext.Fighters.FirstOrDefault(f => f.Name == "Spitfire");
Assert.IsNotNull(spitfireContext);
Assert.AreEqual("Spitfire", spitfireContext.Name);
Assert.AreEqual(100.0, spitfireContext.Position.X);
Assert.AreEqual(200.0, spitfireContext.Position.Y);
Assert.AreEqual(45.0, spitfireContext.Rotation);
Assert.AreEqual(null, spitfireContext.Target);
FighterContext stukaContext = worldContext.Fighters.FirstOrDefault(f => f.Name == "Stuka");
Assert.IsNotNull(stukaContext);
Assert.AreEqual("Stuka", stukaContext.Name);
Assert.AreEqual(300.0, stukaContext.Position.X);
Assert.AreEqual(400.0, stukaContext.Position.Y);
Assert.AreEqual(90.0, stukaContext.Rotation);
Assert.AreEqual(spitfireContext, stukaContext.Target);
// Act: convert back to model.
world = worldContext.CreateModel();
// Assert: correctness of created model.
Assert.IsNotNull(world.Fighters);
Assert.AreEqual(2, world.Fighters.Count);
spitfire = world.Fighters.FirstOrDefault(f => f.Name == "Spitfire");
Assert.IsNotNull(spitfire);
Assert.AreEqual("Spitfire", spitfire.Name);
Assert.AreEqual(100, spitfire.PositionX);
Assert.AreEqual(200, spitfire.PositionY);
Assert.AreEqual(45, spitfire.Rotation);
Assert.AreEqual(null, spitfire.Target);
stuka = world.Fighters.FirstOrDefault(f => f.Name == "Stuka");
Assert.IsNotNull(stuka);
Assert.AreEqual("Stuka", stuka.Name);
Assert.AreEqual(300, stuka.PositionX);
Assert.AreEqual(400, stuka.PositionY);
Assert.AreEqual(90, stuka.Rotation);
Assert.AreEqual(spitfire, stuka.Target);
}
public void TestSerialization()
{
// Arrange: create a world
var world = new World();
var spitfire = new Fighter {Name = "Spitfire", PositionX = 100, PositionY = 200, Rotation = 45};
var stuka = new Fighter{Name = "Stuka", PositionX = 300, PositionY = 400, Rotation = 90, Target = spitfire};
world.Fighters.Add(spitfire);
world.Fighters.Add(stuka);
// Act: Serialize to memory stream.
// Tests should not change the environment,
// so we prefer not to use the file system.
var stream = new MemoryStream();
world.SaveTo(stream);
Assert.IsTrue(stream.Length > 0 );
// Act: Deserialize and check result.
stream.Position = 0;
world = World.LoadFrom(stream);
// Assert: correctness of deserialized world.
Assert.IsNotNull(world.Fighters);
Assert.AreEqual(2, world.Fighters.Count);
spitfire = world.Fighters.FirstOrDefault(f => f.Name == "Spitfire");
Assert.IsNotNull(spitfire);
Assert.AreEqual("Spitfire", spitfire.Name);
Assert.AreEqual(100, spitfire.PositionX);
Assert.AreEqual(200, spitfire.PositionY);
Assert.AreEqual(45, spitfire.Rotation);
Assert.AreEqual(null, spitfire.Target);
stuka = world.Fighters.FirstOrDefault(f => f.Name == "Stuka");
Assert.IsNotNull(stuka);
Assert.AreEqual("Stuka", stuka.Name);
Assert.AreEqual(300, stuka.PositionX);
Assert.AreEqual(400, stuka.PositionY);
Assert.AreEqual(90, stuka.Rotation);
Assert.AreEqual(spitfire, stuka.Target);
// Dump result to debug window for demo purposes
// WARNING: The StreamReader will close the stream when it is closed!
// And the using statement will call Dispose on the StreamReader,
// which will close the stream.
// So we have to do this debug dump at the end of our test.
stream.Position = 0;
using (var reader = new StreamReader(stream))
{
Debug.WriteLine(reader.ReadToEnd());
}
}
public WorldContext(MainContext parent, World worldModel)
{
Main = parent;
// Create fighter contexts from fighter models.
// Use an anonymous class to associate
// the original model with the new context.
var newFighterPairs =
from model in worldModel.Fighters
select new
{
model,
context = new FighterContext(this)
{
Name = model.Name,
Position = new Point(model.PositionX, model.PositionY),
Rotation = model.Rotation
}
};
// For fast lookup, convert the list of model <-> context pairs to a dictionary.
Dictionary<Fighter, FighterContext> newFighterMap =
newFighterPairs.ToDictionary(pair => pair.model, pair => pair.context);
// Set the Target properties (these are possibly cyclically connected)
foreach (var pair in newFighterMap)
{
Fighter targetFighter = pair.Key.Target;
if (targetFighter != null)
{
FighterContext fighterContext = pair.Value;
fighterContext.Target = newFighterMap[targetFighter];
}
}
Fighters = new UndoableCollection<FighterContext>(this, newFighterMap.Values);
}
public World CreateModel()
{
// Create fighter models from fighter contexts.
// Use an anonymous class to associate
// the original context with the new model.
var newFighterPairs =
from context in Fighters
select new
{
context,
model = new Fighter
{
Name = context.Name,
PositionX = context.Position.X,
PositionY = context.Position.Y,
Rotation = context.Rotation
}
};
// For fast lookup, convert the list of context <-> model pairs to a dictionary.
Dictionary<FighterContext, Fighter> newFighterMap =
newFighterPairs.ToDictionary(pair => pair.context, pair => pair.model);
// Set the Target properties (these are possibly cyclically connected)
foreach (var pair in newFighterMap)
{
FighterContext targetFighter = pair.Key.Target;
if (targetFighter != null)
{
Fighter fighterModel = pair.Value;
fighterModel.Target = newFighterMap[targetFighter];
}
}
var world = new World();
world.Fighters.AddRange(newFighterMap.Values);
return world;
}