/// <summary>
/// Gets the loan field with the specified <paramref name="fieldId"/>.
/// </summary>
/// <param name="fieldId">The field id of the loan field to get. Borrower pair specified fields are supported, e.g. "4000#2".</param>
/// <returns></returns>
public LoanField this[string fieldId]
{
get
{
Preconditions.NotNullOrEmpty(fieldId, nameof(fieldId));
FieldDescriptor descriptor;
int? borrowerPairIndex = null;
ModelPath? modelPath = null;
if (fieldId.Length > 2 && fieldId[fieldId.Length - 2] == '#')
{
borrowerPairIndex = fieldId[fieldId.Length - 1] - '1';
if (borrowerPairIndex < 0 || borrowerPairIndex > 5)
{
throw new ArgumentException($"Could not find field '{fieldId}'");
}
var strippedFieldId = fieldId.Substring(0, fieldId.Length - 2);
descriptor = LoanFieldDescriptors.GetFieldDescriptor(strippedFieldId, _loan.Client?.Loans.FieldDescriptors.CustomFields, UndefinedCustomFieldHandling.Default);
if (!descriptor.IsBorrowerPairSpecific)
{
throw new ArgumentException($"Could not find field '{fieldId}'");
}
modelPath = LoanFieldDescriptors.CreateModelPath($"Loan.Applications[(ApplicationIndex == '{borrowerPairIndex}')]{descriptor.ModelPath.Substring(23)}");
}
else
{
descriptor = LoanFieldDescriptors.GetFieldDescriptor(fieldId, _loan.Client?.Loans.FieldDescriptors.CustomFields, _loan.Client?.UndefinedCustomFieldHandling ?? UndefinedCustomFieldHandling.Default);
}
switch (descriptor.Type)
{
case LoanFieldType.Custom:
return(new CustomLoanField(descriptor, _loan));
case LoanFieldType.Virtual:
return(new VirtualLoanField(descriptor, _loan));
default:
return(new LoanField(descriptor, _loan, modelPath, borrowerPairIndex));
}
}
}
/// <summary>
/// Creates an instance descriptor with the specified <paramref name="instanceSpecifier"/>.
/// </summary>
/// <param name="instanceSpecifier">The instance specifier for an instance field descriptor.</param>
/// <returns></returns>
public FieldDescriptor GetInstanceDescriptor(string instanceSpecifier)
{
Preconditions.NotNullOrEmpty(instanceSpecifier, nameof(instanceSpecifier));
if (!MultiInstance)
{
throw new InvalidOperationException("field must be multi-instance to retrieve an instance descriptor");
}
if (IsInstance)
{
throw new InvalidOperationException("cannot retrieve an instance descriptor of an instance descriptor");
}
var formatArg = int.TryParse(instanceSpecifier, NumberStyles.None, null, out var i) ? (object)i : instanceSpecifier;
var modelPathString = string.Format(ModelPath, formatArg);
return(new FieldDescriptor(string.Format(FieldId, formatArg), LoanFieldDescriptors.CreateModelPath(modelPathString), modelPathString, string.Format(Description, formatArg), MultiInstance, instanceSpecifier, this));
}