/// <summary>
/// Raises the LambdaValuesChanged event.
/// </summary>
/// <param name="item"></param>
/// <param name="operation"></param>
/// <param name="oldValue"></param>
/// <param name="newValue"></param>
void RaiseValueChanged(TSource item, LambdaOperation <TResult> operation, TResult oldValue, TResult newValue)
{
if (ValueChanged != null)
{
ValueChanged(this, new LambdaValueChangedEventArgs <TSource, TResult>(item, operation, oldValue, newValue));
}
}
/// <summary>
/// Disposes of the given lambda operation.
/// </summary>
/// <param name="lambda"></param>
void ReleaseLambdaOperation(LambdaOperation <TResult> lambda)
{
// remove from selectors
lambdas.Remove((TSource)lambda.Tag);
// dispose of selector and variables
lambda.ValueChanged -= lambda_ValueChanged;
lambda.Dispose();
foreach (var var in lambda.Context.Variables)
{
var.Value.Dispose();
}
}
/// <summary>
/// Creates a new lambda operation.
/// </summary>
/// <param name="item"></param>
/// <returns></returns>
LambdaOperation <TResult> CreateLambdaOperation(TSource item)
{
// generate new context
var ctx = CreateContextAction(item, Expression.Parameters.ToArray());
if (ctx == null)
{
throw new InvalidOperationException("Could not generate context for new lambda operation.");
}
// create new test and subscribe to test modifications
var lambda = new LambdaOperation <TResult>(ctx, Expression);
lambda.Tag = item;
lambda.ValueChanged += lambda_ValueChanged;
lambdas[item] = lambda;
return(lambda);
}
/// <summary>
/// Gets the original source for the given lambda.
/// </summary>
/// <param name="lambda"></param>
/// <returns></returns>
public TSource this[LambdaOperation <TResult> lambda]
{
get { return((TSource)lambda.Tag); }
}
public int Compare(LambdaOperation <TResult> x, LambdaOperation <TResult> y)
{
return(comparer.Compare(x.Value, y.Value));
}