private void Subscribe()
{
INotifyPropertyChanged subject = this.Subject;
if (subject == null)
{
return;
}
for (int i = 0; i < this.AccessNode.Children.Count; i++)
{
PropertyAccessNode propertyNode = (PropertyAccessNode)this.AccessNode.Children[i];
WeakPropertyChangedEventManager.Register(
subject,
propertyNode.Property.Name,
this,
(me, sender, args) => me.OnPropertyChanged(sender, args));
}
if (this.Children != null)
{
for (int i = 0; i < this.Children.Count; i++)
{
this.Children[i].UpdateSubject(subject);
}
}
}
public SubscriptionNode(
Action <TListener, object> subscriberCallback,
PropertyAccessNode propertyAccessNode)
{
_children = new List <SubscriptionNode>();
_subscriberCallback = subscriberCallback;
_propertyAccessNode = propertyAccessNode;
_onChangedCallback = OnPropertyChanged;
_onChangingCallback = OnPropertyChanging;
BuildChildren();
}
private void Unsubscribe()
{
INotifyPropertyChanged subject = this.Subject;
if (subject == null)
{
return;
}
for (int i = 0; i < this.AccessNode.Children.Count; i++)
{
PropertyAccessNode propertyNode = (PropertyAccessNode)this.AccessNode.Children[i];
WeakPropertyChangedEventManager.Unregister(subject, propertyNode.Property.Name, this, null);
}
if (this.Children != null)
{
for (int i = 0; i < this.Children.Count; i++)
{
this.Children[i].Unsubscribe();
}
}
}
private static void BuildBranches(Expression expression, PropertyAccessTree tree, Stack <PropertyAccessTreeNode> currentNodeBranch, Predicate <Type> typeFilter)
{
BinaryExpression binaryExpression = expression as BinaryExpression;
if (binaryExpression != null)
{
BuildBranches(binaryExpression.Left, tree, currentNodeBranch, typeFilter);
BuildBranches(binaryExpression.Right, tree, currentNodeBranch, typeFilter);
return;
}
UnaryExpression unaryExpression = expression as UnaryExpression;
if (unaryExpression != null)
{
BuildBranches(unaryExpression.Operand, tree, currentNodeBranch, typeFilter);
return;
}
MethodCallExpression methodCallExpression = expression as MethodCallExpression;
if (methodCallExpression != null)
{
foreach (Expression argument in methodCallExpression.Arguments)
{
BuildBranches(argument, tree, currentNodeBranch, typeFilter);
}
return;
}
ConditionalExpression conditionalExpression = expression as ConditionalExpression;
if (conditionalExpression != null)
{
BuildBranches(conditionalExpression.Test, tree, currentNodeBranch, typeFilter);
BuildBranches(conditionalExpression.IfTrue, tree, currentNodeBranch, typeFilter);
BuildBranches(conditionalExpression.IfFalse, tree, currentNodeBranch, typeFilter);
return;
}
InvocationExpression invocationExpression = expression as InvocationExpression;
if (invocationExpression != null)
{
foreach (Expression argument in invocationExpression.Arguments)
{
BuildBranches(argument, tree, currentNodeBranch, typeFilter);
}
BuildBranches(invocationExpression.Expression, tree, currentNodeBranch, typeFilter);
return;
}
switch (expression.NodeType)
{
case ExpressionType.MemberAccess:
MemberExpression memberExpression = (MemberExpression)expression;
PropertyInfo property = memberExpression.Member as PropertyInfo;
FieldInfo fieldInfo = memberExpression.Member as FieldInfo;
if (property != null)
{
PropertyAccessNode node = new PropertyAccessNode(property);
currentNodeBranch.Push(node);
BuildBranches(memberExpression.Expression, tree, currentNodeBranch, typeFilter);
}
else if (fieldInfo != null)
{
if (typeFilter(fieldInfo.FieldType))
{
ConstantExpression constantExpression = (ConstantExpression)memberExpression.Expression;
if (constantExpression.Value != null)
{
object value = fieldInfo.GetValue(constantExpression.Value);
ConstantNode constantNode = new ConstantNode((INotifyPropertyChanged)value);
currentNodeBranch.Push(constantNode);
AddBranch(tree, currentNodeBranch);
}
}
else
{
currentNodeBranch.Clear();
}
}
else
{
BuildBranches(memberExpression.Expression, tree, currentNodeBranch, typeFilter);
}
break;
case ExpressionType.Parameter:
ParameterExpression parameterExpression = (ParameterExpression)expression;
ParameterNode parameterNode = new ParameterNode(expression.Type, parameterExpression.Name);
currentNodeBranch.Push(parameterNode);
AddBranch(tree, currentNodeBranch);
break;
case ExpressionType.Constant:
{
ConstantExpression constantExpression = (ConstantExpression)expression;
if (typeFilter(constantExpression.Type) &&
constantExpression.Value != null)
{
ConstantNode constantNode = new ConstantNode((INotifyPropertyChanged)constantExpression.Value);
currentNodeBranch.Push(constantNode);
AddBranch(tree, currentNodeBranch);
}
else
{
currentNodeBranch.Clear();
}
}
break;
case ExpressionType.New:
{
NewExpression newExpression = (NewExpression)expression;
foreach (Expression argument in newExpression.Arguments)
{
BuildBranches(argument, tree, currentNodeBranch, typeFilter);
}
}
break;
case ExpressionType.MemberInit:
{
MemberInitExpression memberInitExpression = (MemberInitExpression)expression;
BuildBranches(memberInitExpression.NewExpression, tree, currentNodeBranch, typeFilter);
foreach (var memberBinding in memberInitExpression.Bindings)
{
MemberAssignment assignment = memberBinding as MemberAssignment;
if (assignment != null)
{
BuildBranches(assignment.Expression, tree, currentNodeBranch, typeFilter);
}
}
}
break;
default:
throw new InvalidProgramException(string.Format("CLINQ does not support expressions of type: {0}", expression.NodeType));
}
}
