/// <summary>
/// Creates the graph.
/// </summary>
/// <returns></returns>
/// <exception cref="NotSupportedException">
/// Operation not supported for the given expression type {expression.Type}. "
/// + "Only MemberExpression and ConstantExpression are currently supported.
/// </exception>
/// <exception cref="InvalidOperationException">
/// Trying to subscribe PropertyChanged listener in object that "
/// + $"owns '{rootPropertyInfo.Name}' property, but the object does not implements INotifyPropertyChanged.
/// </exception>
/// <exception cref="System.NotSupportedException">
/// Operation not supported for the given expression type. "
/// + "Only MemberExpression and ConstantExpression are currently supported.
/// </exception>
/// <exception cref="System.InvalidOperationException">
/// Trying to subscribe PropertyChanged listener in object that "
/// + $"owns '{parameterObserverRootNode.PropertyInfo.Name}' property, but the object does not implements
/// INotifyPropertyChanged.
/// </exception>
private (ParameterObserverRootNode <TOwner>, string) CreateChain()
{
var expression = this.propertyExpression;
var expressionString = "";
var propertyInfos = new Stack <PropertyInfo>();
while (expression is MemberExpression memberExpression)
{
if (!(memberExpression.Member is PropertyInfo propertyInfo))
{
continue;
}
expression = memberExpression.Expression;
propertyInfos.Push(propertyInfo);
}
if (!(expression is ConstantExpression constantExpression))
{
throw new NotSupportedException(
$"Operation not supported for the given expression type {expression.Type}. "
+ "Only MemberExpression and ConstantExpression are currently supported.");
}
var rootPropertyInfo = propertyInfos.Pop();
expressionString = OwnerString + this.propertyExpression.ToString()
.Remove(0, constantExpression.ToString().Length);
if (!(constantExpression.Value is IReadOnlyParameter parameter))
{
throw new InvalidOperationException(
"Trying to subscribe PropertyChanged listener in object that "
+ $"owns '{rootPropertyInfo.Name}' property, but the object does not implements IReadOnlyParameter.");
}
if (!(constantExpression.Value is TOwner owner))
{
throw new InvalidOperationException(
"Trying to subscribe PropertyChanged listener in object that "
+ $"owns '{rootPropertyInfo.Name}' property, but the object does not of type '{typeof(TOwner).Name}'.");
}
var root = new ParameterObserverRootNode <TOwner>(rootPropertyInfo, this.CallAction, owner, parameter);
ParameterObserverNode previousNode = root;
foreach (var currentNode in propertyInfos.Select(name => new ParameterObserverNode(name, this.CallAction)))
{
previousNode.Next = currentNode;
previousNode = currentNode;
}
return(root, expressionString);
}
/// <summary>
/// Creates the chain.
/// </summary>
/// <param name="owner">The owner.</param>
/// <returns></returns>
/// <exception cref="NotSupportedException">
/// Operation not supported for the given expression type {expression.Type}. "
/// + "Only MemberExpression and ConstantExpression are currently supported.
/// </exception>
private (IParameterObserverRootNode <TOwner>, string) CreateChain(TOwner owner)
{
var expression = this.propertyExpression;
var expressionString = "";
var propertyInfos = new Stack <PropertyInfo>();
while (expression is MemberExpression memberExpression)
{
if (!(memberExpression.Member is PropertyInfo info))
{
continue;
}
expression = memberExpression.Expression;
propertyInfos.Push(info);
}
if (!(expression is ParameterExpression parameterExpression))
{
throw new NotSupportedException(
$"Operation not supported for the given expression type {expression.Type}. "
+ "Only MemberExpression and ConstantExpression are currently supported.");
}
var rootPropertyInfo = propertyInfos.Pop();
expressionString = OwnerString + this.propertyExpression.ToString()
.Remove(0, parameterExpression.ToString().Length);
ParameterObserverRootNode <TOwner> parameterObserverRoot;
if (owner is IReadOnlyParameter p)
{
if (!propertyInfos.Any())
{
return(new ParameterObserverSingleNode <TOwner>(this.CallAction, owner, p), expressionString);
}
parameterObserverRoot = new ParameterObserverRootNode <TOwner>(
rootPropertyInfo,
this.CallAction,
owner,
p);
}
else
{
if (!(rootPropertyInfo.GetValue(owner) is IReadOnlyParameter v))
{
throw new Exception("No Parameter.");
}
if (!propertyInfos.Any())
{
return(new ParameterObserverSingleNode <TOwner>(this.CallAction, owner, v), expressionString);
}
var propertyInfo = propertyInfos.Pop();
if (typeof(IReadOnlyParameter).IsAssignableFrom(propertyInfo.PropertyType))
{
parameterObserverRoot = new ParameterObserverRootNode <TOwner>(
propertyInfo,
this.CallAction,
owner,
v);
}
else
{
propertyInfo = propertyInfos.Pop();
if (typeof(IReadOnlyParameter).IsAssignableFrom(propertyInfo.PropertyType))
{
parameterObserverRoot = new ParameterObserverRootNode <TOwner>(
propertyInfo,
this.CallAction,
owner,
v);
}
else
{
throw new Exception("No Parameter 3.");
}
}
}
ParameterObserverNode previousNode = parameterObserverRoot;
foreach (var node in propertyInfos
.Where(currentNode => typeof(IReadOnlyParameter).IsAssignableFrom(currentNode.PropertyType))
.Select(currentNode => new ParameterObserverNode(currentNode, this.CallAction)))
{
previousNode.Next = node;
previousNode = node;
}
var endNode = new ParameterObserverEndNode(this.CallAction);
previousNode.Next = endNode;
return(parameterObserverRoot, expressionString);
}