private void AddPackageToStack(Stack <string> stackOfPackageAndDependency, string packageName)
{
if (stackOfPackageAndDependency.Contains(packageName))
{
throw InputParserException.InvalidInputException(ErrorMessages.INPUT_CONTAINS_CYCLE);
}
else
{
stackOfPackageAndDependency.Push(packageName);
}
}
private void ValidateInput(string[] input)
{
//Test if input is null
if (input == null)
{
throw InputParserException.InvalidInputException(ErrorMessages.NULL_INPUT_MESSAGE);
}
//Test that input contains null element.
if (input.Any(x => x is null))
{
throw InputParserException.InvalidInputException(ErrorMessages.INVALID_INPUT_MESSAGE);
}
//Test if input contains ":" in every element
if (input.Any(x => !x.Contains(":")))
{
throw InputParserException.InvalidInputException(ErrorMessages.INVALID_INPUT_MESSAGE);
}
}
public IEnumerable <string> ParseInput(string[] input)
{
ValidateInput(input);
IDictionary <string, string> dependencies = ParseInputIntoPackageAndDependency(input);
List <string> sequencedPackageNames = new List <string>();
foreach (var pkgDependency in dependencies)
{
string packageName = pkgDependency.Key;
if (string.IsNullOrWhiteSpace(packageName))
{
throw InputParserException.InvalidInputException(ErrorMessages.PACKAGENAME_IS_EMPTY);
}
if (!sequencedPackageNames.Contains(pkgDependency.Key, StringComparer.InvariantCultureIgnoreCase))
{
IEnumerable <string> resolvedDependencies = ResolveDependenciesForPackage(pkgDependency, dependencies).ToList();
sequencedPackageNames.AddRange(resolvedDependencies);
}
}
return(sequencedPackageNames.Distinct());
}