/// <summary>
/// Sets the <paramref name="inputExpression">input expression</paramref> for the input referenced by <paramref name="inputRef"/>
/// </summary>
/// <remarks>
/// When the expression is null or whitespace the table input will not be used for the rule (will be removed when it was already defined before).
/// When the expression is "valid" and the input expression has been defined before, it will override it
/// </remarks>
/// <param name="inputRef">Reference to decision table input</param>
/// <param name="inputExpression">Input evaluation expression</param>
/// <exception cref="DmnBuilderException">Throws <see cref="DmnBuilderException"/> when the definition has already been built</exception>
/// <exception cref="ArgumentNullException">Throws <see cref="ArgumentNullException"/> when the <paramref name="inputRef"/> is null</exception>
/// <exception cref="DmnBuilderException">Throws <see cref="DmnBuilderException"/> when the <paramref name="inputRef"/> is not recognized as the valid table input</exception>
private void SetInput(TableInput.Ref inputRef, string inputExpression)
{
if (IsBuilt)
{
throw Logger.Error <DmnBuilderException>("Table rule is already built");
}
if (inputRef == null)
{
throw new ArgumentNullException(nameof(inputRef));
}
if (!AllTableInputs.ContainsKey(inputRef))
{
throw Logger.Error <DmnBuilderException>("Input reference is not valid for current table");
}
if (string.IsNullOrWhiteSpace(inputExpression))
{
if (InputsInternal.ContainsKey(inputRef))
{
InputsInternal.Remove(inputRef);
}
}
else
{
InputsInternal[inputRef] = inputExpression;
}
}
