/// <summary>
/// Performs validation of the <paramref name="rules"/>.
/// </summary>
/// <param name="rules"> The set of retention rules to validate. </param>
public void Validate([NotNull, ItemNotNull] IReadOnlyCollection <RetentionRule> rules)
{
AssertArg.NotNullOrEmpty(rules, nameof(rules));
AssertArg.NoNullItems(rules, nameof(rules));
AssertNoDuplicates(rules);
AssertNoContradictions(rules);
}
/// <summary>
/// Initializes a new instance of the <see cref="RetentionPolicy" /> class.
/// </summary>
/// <param name="rules">
/// The collection of rules that define the policy.
/// </param>
/// <exception cref="ArgumentNullException">
/// <paramref name="rules"/> is <see langword="null"/>.
/// </exception>
/// <exception cref="ArgumentException">
/// Any item in the <paramref name="rules"/> is <see langword="null"/> or
/// <paramref name="rules"/> is empty or
/// <paramref name="rules"/> contains duplicate or mutually contradictory items.
/// </exception>
public RetentionPolicy([NotNull, ItemNotNull] IReadOnlyCollection <RetentionRule> rules)
{
AssertArg.NotNullOrEmpty(rules, nameof(rules));
AssertArg.NoNullItems(rules, nameof(rules));
Validator.Validate(rules);
_orderedRules = rules
.OrderBy(r => r.OlderThan)
.ToReadOnlyList();
}