public void TestObjectPathExpressionArrayIndexer()
{
var exp = ObjectPathExpression.Parse("[0]");
var eval = exp.Evaluate(new int[] { 100, 200, 300 });
Assert.AreEqual(100, eval);
}
public void TestObjectPathExpressionStringIndexer()
{
var exp = ObjectPathExpression.Parse("[0]");
var eval = exp.Evaluate("ABCD");
Assert.AreEqual('A', eval);
}
public void TestObjectPathExpressionNestedProperty()
{
var exp = ObjectPathExpression.Parse("Person.FirstName");
var eval = exp.Evaluate(new { Person = new { FirstName = "John", LastName = "Smith" } });
Assert.AreEqual("John", eval);
}
public void TestObjectPathExpressionSingleProperty()
{
var exp = ObjectPathExpression.Parse("Length");
var eval = exp.Evaluate("1234");
Assert.AreEqual(4, eval);
}
public void TestOneLevel()
{
var testString = "Adam";
var expression = ObjectPathExpression.Parse("Length");
var eval = expression.Evaluate(testString);
Assert.AreEqual(testString.Length, eval);
}
public void TestObjectPathExpressionDictionaryIndexerWithSpaces()
{
var exp = ObjectPathExpression.Parse("[\"Meaning Of Life\"]");
var eval = exp.Evaluate(new Dictionary <string, int>()
{
{ "Meaning Of Life", 42 }
});
Assert.AreEqual(42, eval);
}
public void TestObjectPathExpressionNestedPropertyAfterIndexerWithWhitespaceEverywhere()
{
var exp = ObjectPathExpression.Parse(" [ 0 ] . Person . FirstName ");
var eval = exp.Evaluate(new object[]
{
new { Person = new { FirstName = "John", LastName = "Smith" } },
new { Person = new { FirstName = "Bob", LastName = "Smith" } }
});
Assert.AreEqual("John", eval);
}
public void TestBackToBackIndexer()
{
var testObj = new string[1][];
testObj[0] = new string[1];
testObj[0][0] = "Adam";
var expression = ObjectPathExpression.Parse("[0][0]");
var eval = expression.Evaluate(testObj);
Assert.AreEqual(testObj[0][0], eval);
}
public ViewModelBinding(ConsoleControl control, PropertyInfo controlProperty, ObservableObject viewModel, string observablePath, Func <object, object> mapper, Func <object, object> reverseMapper)
{
this.mapper = mapper;
this.reverseMapper = reverseMapper;
var exp = ObjectPathExpression.Parse(observablePath);
var trace = exp.EvaluateAndTraceInfo(viewModel);
var observableObject = trace[trace.Count - 2].Value as ObservableObject;
var viewModelObservableProperty = trace.Last()?.MemberInfo as PropertyInfo;
if (observableObject == null)
{
throw new InvalidOperationException($"ViewModel property '{viewModel.GetType().FullName}.{observablePath}' is not observable");
}
if (viewModelObservableProperty == null)
{
throw new InvalidOperationException($"Cannot resolve ViewModel property '{viewModel.GetType().FullName}.{observablePath}'");
}
if (mapper != null && reverseMapper != null)
{
if (viewModelObservableProperty.PropertyType != controlProperty.PropertyType &&
viewModelObservableProperty.PropertyType.IsSubclassOf(controlProperty.PropertyType) == false &&
viewModelObservableProperty.PropertyType.GetInterfaces().Contains(controlProperty.PropertyType) == false)
{
throw new InvalidOperationException($"ViewModel type '{viewModel.GetType().FullName} property {observablePath}' of type {viewModelObservableProperty.PropertyType.FullName} is not compatible with control property '{controlProperty.DeclaringType.FullName}.{controlProperty.Name}' of type {controlProperty.PropertyType.FullName} ");
}
}
observableObject.SynchronizeForLifetime(trace.Last().MemberInfo.Name, () =>
{
var newValue = viewModelObservableProperty.GetValue(observableObject);
if (newValue == latestValue)
{
return;
}
latestValue = newValue;
controlProperty.SetValue(control, mapper != null ? mapper(newValue) : newValue);
}, control.LifetimeManager);
control.SubscribeForLifetime(controlProperty.Name, () =>
{
var newValue = controlProperty.GetValue(control);
if (newValue == latestValue)
{
return;
}
latestValue = newValue;
viewModelObservableProperty.SetValue(observableObject, reverseMapper != null ? reverseMapper(newValue) : newValue);
}, control.LifetimeManager);
}
public void TestTwoLevels()
{
var testObj = new Customer()
{
Name = "Adam", Address = new Address()
{
Line1 = "123 Main Street", Line2 = "Seattle, WA", ZipCode = "12345"
}
};
var expression = ObjectPathExpression.Parse("Address.Line1");
var eval = expression.Evaluate(testObj);
Assert.AreEqual(testObj.Address.Line1, eval);
}
public void TestDeep()
{
var testObj = new Customer()
{
Name = "Adam", Address = new Address()
{
Line1 = "123 Main Street", Line2 = "Seattle, WA", ZipCode = "12345"
}
};
testObj.RelatedCustomers.Add(testObj);
var expression = ObjectPathExpression.Parse("RelatedCustomers[0].RelatedCustomers[0].Name");
var eval = expression.Evaluate(testObj);
Assert.AreEqual(testObj.RelatedCustomers[0].RelatedCustomers[0].Name, eval);
}
private IDisposable DeepSubscribeInternal(string path, Action handler, Lifetime rootLifetime = null)
{
rootLifetime = rootLifetime ?? new Lifetime();
var observableRoot = DeepObservableRoot ?? this;
IObservableObject currentObservable = observableRoot;
var pathExpression = ObjectPathExpression.Parse(path);
List <IObjectPathElement> currentPath = new List <IObjectPathElement>();
var anyChangeLifetime = new Lifetime();
for (int i = 0; i < pathExpression.Elements.Count; i++)
{
var propertyElement = pathExpression.Elements[i] as PropertyPathElement;
if (propertyElement == null)
{
throw new NotSupportedException("Indexers are not supported for deep observability");
}
currentPath.Add(propertyElement);
ObjectPathExpression.TraceNode eval;
if (i == pathExpression.Elements.Count - 1 && propertyElement.PropertyName == ObservableObject.AnyProperty)
{
eval = new ObjectPathExpression.TraceNode()
{
Value = null
};
}
else
{
eval = new ObjectPathExpression(currentPath).EvaluateAndTraceInfo(observableRoot).Last();
if (i != pathExpression.Elements.Count - 1 && (eval.MemberInfo as PropertyInfo).PropertyType.GetInterfaces().Contains(typeof(IObservableObject)) == false)
{
throw new NotSupportedException($"element {eval.MemberInfo.Name} is not observable");
}
}
currentObservable.SubscribeForLifetime(propertyElement.PropertyName, () =>
{
handler();
if (anyChangeLifetime.IsExpired == false)
{
anyChangeLifetime.Dispose();
}
if (rootLifetime.IsExpired == false)
{
DeepSubscribeInternal(path, handler, rootLifetime);
}
}, EarliestOf(anyChangeLifetime, rootLifetime).LifetimeManager);
currentObservable = eval.Value as IObservableObject;
if (currentObservable == null)
{
break;
}
}
return(rootLifetime);
}
