private static ExpressionNode Parse(string expression, bool enableDataValidation)
{
if (!string.IsNullOrWhiteSpace(expression))
{
return(ExpressionNodeBuilder.Build(expression, enableDataValidation));
}
else
{
return(new EmptyExpressionNode());
}
}
/// <summary>
/// Initializes a new instance of the <see cref="ExpressionObserver"/> class.
/// </summary>
/// <param name="root">The root object.</param>
/// <param name="expression">The expression.</param>
/// <param name="enableValidation">Whether property validation should be enabled.</param>
public ExpressionObserver(object root, string expression, bool enableValidation = false)
{
Contract.Requires <ArgumentNullException>(expression != null);
_root = new WeakReference(root);
_enableValidation = enableValidation;
if (!string.IsNullOrWhiteSpace(expression))
{
_node = ExpressionNodeBuilder.Build(expression, enableValidation);
}
Expression = expression;
}
/// <summary>
/// Initializes a new instance of the <see cref="ExpressionObserver"/> class.
/// </summary>
/// <param name="rootObservable">An observable which provides the root object.</param>
/// <param name="expression">The expression.</param>
/// <param name="enableValidation">Whether property validation should be enabled.</param>
public ExpressionObserver(
IObservable <object> rootObservable,
string expression,
bool enableValidation = false)
{
Contract.Requires <ArgumentNullException>(rootObservable != null);
Contract.Requires <ArgumentNullException>(expression != null);
_rootObservable = rootObservable;
_enableValidation = enableValidation;
if (!string.IsNullOrWhiteSpace(expression))
{
_node = ExpressionNodeBuilder.Build(expression, enableValidation);
}
Expression = expression;
}
/// <summary>
/// Initializes a new instance of the <see cref="ExpressionObserver"/> class.
/// </summary>
/// <param name="rootGetter">A function which gets the root object.</param>
/// <param name="expression">The expression.</param>
/// <param name="update">An observable which triggers a re-read of the getter.</param>
/// <param name="enableValidation">Whether property validation should be enabled.</param>
public ExpressionObserver(
Func <object> rootGetter,
string expression,
IObservable <Unit> update,
bool enableValidation = false)
{
Contract.Requires <ArgumentNullException>(rootGetter != null);
Contract.Requires <ArgumentNullException>(expression != null);
Contract.Requires <ArgumentNullException>(update != null);
_rootGetter = rootGetter;
_update = update;
_enableValidation = enableValidation;
if (!string.IsNullOrWhiteSpace(expression))
{
_node = ExpressionNodeBuilder.Build(expression, enableValidation);
}
Expression = expression;
}