/// <summary>
/// Creates a pattern element that represents a match over results of the source element.
/// </summary>
/// <param name="declaration">Declaration that references the pattern.</param>
/// <param name="conditions">Condition elements that represent conditions applied to the elements matched by the pattern.</param>
/// <param name="source">Source of the elements matched by the pattern. If it's <c>null</c>, the pattern matches facts in rules engine's working memory.</param>
/// <returns>Created element.</returns>
public static PatternElement Pattern(Declaration declaration, IEnumerable <ConditionElement> conditions, PatternSourceElement source)
{
if (declaration == null)
{
throw new ArgumentNullException(nameof(declaration), "Pattern declaration not provided");
}
if (conditions == null)
{
throw new ArgumentNullException(nameof(conditions), "Pattern conditions not provided");
}
var element = new PatternElement(declaration, conditions, source);
declaration.Target = element;
return(element);
}
/// <summary>
/// Creates a pattern element that represents a match over results of the source element.
/// </summary>
/// <param name="type">Type of elements matched by the pattern.</param>
/// <param name="name">Pattern name.</param>
/// <param name="conditions">Condition elements that represent conditions applied to the elements matched by the pattern.</param>
/// <param name="source">Source of the elements matched by the pattern. If it's <c>null</c>, the pattern matches facts in rules engine's working memory.</param>
/// <returns>Created element.</returns>
public static PatternElement Pattern(Type type, string name, IEnumerable <ConditionElement> conditions, PatternSourceElement source)
{
if (type == null)
{
throw new ArgumentNullException(nameof(type), "Pattern type not provided");
}
if (string.IsNullOrEmpty(name))
{
throw new ArgumentNullException(nameof(name), "Pattern name not provided");
}
var declaration = new Declaration(type, name);
var element = Pattern(declaration, conditions, source);
return(element);
}
