/// <summary>
/// Expands the specified segment collection which contains only optinal and literal segments.
/// The optional segments are processed recursively and the literals are parsed for parameters.
/// </summary>
/// <param name="collection">The collection of segments to expand.</param>
/// <param name="constraints">The constraints.</param>
/// <param name="parameters">The parameters hash set to track the uniqueness.</param>
/// <returns>Returns the expanded path segments tree.</returns>
protected virtual PathSegmentCollection Expand(PathSegmentCollection collection, IDictionary <string, object> constraints, HashSet <string> parameters)
{
var result = new PathSegmentCollection();
foreach (var item in collection)
{
if (item is LiteralPathSegment)
{
var staticItem = (LiteralPathSegment)item;
var list = Parse(staticItem.Text, constraints, parameters);
result.AddRange(list);
}
else if (item is OptionalPathSegment)
{
var optItem = new OptionalPathSegment();
result.Add(optItem);
var inner = Expand(item.Segments, constraints, parameters);
optItem.Segments.AddRange(inner);
}
}
return(result);
}
/// <summary>
/// Initializes a new instance of the <see cref="PathSegment"/> class.
/// </summary>
public PathSegment()
{
this.Segments = new PathSegmentCollection();
}