/// <summary>
/// Checks for all elements with a based-on field that the referenced ids exist and have the
/// same type
/// </summary>
/// <exception cref="LoadException">
/// if base id does not exist or base element does not have the same type
/// </exception>
private void ValidateBaseIdsExist()
{
var errors = (
from element in this._tles
where element.BasedOnId != null &&
this._tles.All(elem => elem.Id != element.BasedOnId)
select element
).ToList();
if (errors.Any())
{
throw LoadException.BaseElementNotFound(errors);
}
var typeErrors = (
from element in this._tles
where element.BasedOnId != null
let baseElem = this._tles.First(e => e.Id == element.BasedOnId)
where !baseElem.GetType().IsInstanceOfType(element)
select(
Base: baseElem,
Target: element
)
).ToList();
if (typeErrors.Any())
{
throw LoadException.BaseElementHasDifferentType(typeErrors);
}
}
/// <summary>
/// process 'based-on' fields
/// </summary>
/// <exception cref="LoadException"></exception>
private void RealizeInheritance()
{
var realisationQueue = new Queue <BasicElement>(this._tles);
int stepsBeforeAbort = realisationQueue.Count;
while (realisationQueue.Count > 0 && stepsBeforeAbort > 0)
{
stepsBeforeAbort--;
bool processedElement = false;
var targetElem = realisationQueue.Dequeue();
if (targetElem.BasedOnId == null)
{
processedElement = true;
}
else
{
var baseElem = this._tles.First(e => e.Id == targetElem.BasedOnId);
// if base element is not done yet, postpone target element
if (realisationQueue.Contains(baseElem))
{
realisationQueue.Enqueue(targetElem);
}
else
{
// base element done, do the actual work
// properties contains all properties of baseElem type that have the YamlMember attribute
var properties =
from prop in baseElem.GetType().GetProperties()
where prop.IsDefined(typeof(YamlMemberAttribute), true)
select prop;
// for each of those properties
foreach (var prop in properties)
{
// set the target value to the base value if target value is not set
var targetValue = prop.GetValue(targetElem);
if (targetValue == null)
{
var baseValue = prop.GetValue(baseElem);
prop.SetValue(targetElem, baseValue);
}
}
processedElement = true;
}
}
if (processedElement)
{
stepsBeforeAbort = realisationQueue.Count;
}
}
if (realisationQueue.Count > 0)
{
throw LoadException.InheritanceLoopAborted(realisationQueue);
}
}
/// <summary>
/// checks for duplicate ids and whether all ids are well-formed
/// </summary>
/// <exception cref="LoadException">if one or more elements does not fufill these rules</exception>
private void ValidateUniqueWellformedIds()
{
var duplicates = (
from tle in this._tles
group tle by tle.Id
into grouped
where grouped.Count() > 1
select(
grouped.Key,
grouped.AsEnumerable()
)
).ToList();
if (duplicates.Any())
{
string msg = "The project contains duplicate element ids, which is not allowed.\n";
foreach ((string id, var elements) in duplicates)
{
msg += $"- id '{id}', defined in:\n";
msg = elements.Aggregate(msg, (current, elem)
=> current + $" - '{elem.OriginalFilePath}'\n");
}
throw new LoadException(msg);
}
// matches 'id', 'some-id', 'id-9-test', but not ' id ', '%KHGSI'
var idRegex = new Regex("[a-z][a-z]+(-([a-z]|[0-9])+)*"); // good regex tool: regexr.com
var mismatches = this._tles.Where(tle => !idRegex.IsMatch(tle.Id)).ToList();
if (mismatches.Any())
{
throw LoadException.MalformedId(mismatches);
}
}
/// <summary>
/// Checks if all properties with the [YamlProperties] attribute and Required set to true
/// have a value for all of the loaded elements
/// </summary>
/// <exception cref="LoadException">if a required property is null</exception>
private void ValidateRequiredFields()
{
var errors = (
from element in this._tles
from property in element.GetType().GetProperties()
// ignore properties that have [YamlIgnore]
where !property.IsDefined(typeof(YamlIgnoreAttribute)) &&
property.GetValue(element) == null &&
property.IsDefined(typeof(YamlPropertiesAttribute), true)
let yamlPropsAttr = property.GetCustomAttribute <YamlPropertiesAttribute>()
where yamlPropsAttr.Required
let yamlMember = property.GetCustomAttribute <YamlMemberAttribute>()
select(
Element: element,
PropYamlName: yamlMember.Alias,
PropCsName: property.Name
)
).ToList();
if (errors.Any())
{
throw LoadException.RequiredPropertyNull(errors);
}
}