/// <summary>
/// Copies the changed property values from the underlying entity (accessible via <see cref="GetInstance()" />)
/// to the <paramref name="original"/> entity recursively.
/// </summary>
/// <param name="original">The entity to be updated.</param>
public void CopyChangedValues(T original)
{
if (original == null)
{
throw Error.ArgumentNull("original");
}
// Delta parameter type cannot be derived type of original
// to prevent unrecognizable information from being applied to original resource.
if (!_structuredType.IsAssignableFrom(original.GetType()))
{
throw Error.Argument("original", SRResources.DeltaTypeMismatch, _structuredType, original.GetType());
}
RuntimeHelpers.EnsureSufficientExecutionStack();
// For regular non-structural properties at current level.
PropertyAccessor <T>[] propertiesToCopy =
this._changedProperties.Select(s => _allProperties[s]).ToArray();
foreach (PropertyAccessor <T> propertyToCopy in propertiesToCopy)
{
propertyToCopy.Copy(_instance, original);
}
CopyChangedDynamicValues(original);
// For nested resources.
foreach (string nestedResourceName in _deltaNestedResources.Keys)
{
// Patch for each nested resource changed under this T.
dynamic deltaNestedResource = _deltaNestedResources[nestedResourceName];
dynamic originalNestedResource = null;
if (!TryGetPropertyRef(original, nestedResourceName, out originalNestedResource))
{
throw Error.Argument(nestedResourceName, SRResources.DeltaNestedResourceNameNotFound,
nestedResourceName, original.GetType());
}
if (originalNestedResource == null)
{
// When patching original target of null value, directly set nested resource.
dynamic deltaObject = _deltaNestedResources[nestedResourceName];
dynamic instance = deltaObject.GetInstance();
// Recursively patch up the instance with the nested resources.
deltaObject.CopyChangedValues(instance);
_allProperties[nestedResourceName].SetValue(original, instance);
}
else
{
// Recursively patch the subtree.
bool isDeltaType = DeltaHelper.IsDeltaOfT(deltaNestedResource.GetType());
Contract.Assert(isDeltaType, nestedResourceName + "'s corresponding value should be Delta<T> type but is not.");
deltaNestedResource.CopyChangedValues(originalNestedResource);
}
}
}
/// <inheritdoc/>
public override bool TryGetPropertyValue(string name, out object value)
{
if (name == null)
{
throw Error.ArgumentNull("name");
}
if (_dynamicDictionaryPropertyinfo != null)
{
if (_dynamicDictionaryCache == null)
{
_dynamicDictionaryCache =
GetDynamicPropertyDictionary(_dynamicDictionaryPropertyinfo, _instance, create: false);
}
if (_dynamicDictionaryCache != null && _dynamicDictionaryCache.TryGetValue(name, out value))
{
return(true);
}
}
if (this._deltaNestedResources.ContainsKey(name))
{
// If this is a nested resource, get the value from the dictionary of nested resources.
object deltaNestedResource = _deltaNestedResources[name];
Contract.Assert(deltaNestedResource != null, "deltaNestedResource != null");
Contract.Assert(DeltaHelper.IsDeltaOfT(deltaNestedResource.GetType()));
// Get the Delta<{NestedResourceType}>._instance using Reflection.
FieldInfo field = deltaNestedResource.GetType().GetField("_instance", BindingFlags.NonPublic | BindingFlags.Instance);
Contract.Assert(field != null, "field != null");
value = field.GetValue(deltaNestedResource);
return(true);
}
else
{
// try to retrieve the value of property.
PropertyAccessor <T> cacheHit;
if (_allProperties.TryGetValue(name, out cacheHit))
{
value = cacheHit.GetValue(_instance);
return(true);
}
}
value = null;
return(false);
}
/// <summary>
/// Attempts to get the value of the nested Property called <paramref name="name"/> from the underlying resource.
/// <remarks>
/// Only properties that exist on Entity can be retrieved.
/// Only modified nested properties can be retrieved.
/// The nested Property type will be <see cref="IDelta"/> of its defined type.
/// </remarks>
/// </summary>
/// <param name="name">The name of the nested Property</param>
/// <param name="value">The value of the nested Property</param>
/// <returns><c>True</c> if the Property was found and is a nested Property</returns>
internal bool TryGetNestedPropertyValue(string name, out object value)
{
if (name == null)
{
throw Error.ArgumentNull(nameof(name));
}
if (!_deltaNestedResources.ContainsKey(name))
{
value = null;
return(false);
}
// This is a nested resource, the value returned must be an IDelta<T>
// from the dictionary of nested resources to allow the traversal of
// hierarchies of Delta<T>.
object deltaNestedResource = _deltaNestedResources[name];
Contract.Assert(deltaNestedResource != null, "deltaNestedResource != null");
Contract.Assert(DeltaHelper.IsDeltaOfT(deltaNestedResource.GetType()));
value = deltaNestedResource;
return(true);
}
