public TreeRouter Build(int version)
{
// Tree route builder builds a tree for each of the different route orders defined by
// the user. When a route needs to be matched, the matching algorithm in tree router
// just iterates over the trees in ascending order when it tries to match the route.
var trees = new Dictionary <int, UrlMatchingTree>();
foreach (var entry in InboundEntries)
{
if (!trees.TryGetValue(entry.Order, out var tree))
{
tree = new UrlMatchingTree(entry.Order);
trees.Add(entry.Order, tree);
}
tree.AddEntry(entry);
}
return(new TreeRouter(
trees.Values.OrderBy(tree => tree.Order).ToArray(),
OutboundEntries,
_urlEncoder,
_objectPool,
_logger,
_constraintLogger,
version));
}
public TreeRouter Build(int version)
{
var trees = new Dictionary<int, UrlMatchingTree>();
foreach (var entry in _matchingEntries)
{
UrlMatchingTree tree;
if (!trees.TryGetValue(entry.Order, out tree))
{
tree = new UrlMatchingTree(entry.Order);
trees.Add(entry.Order, tree);
}
AddEntryToTree(tree, entry);
}
return new TreeRouter(
_target,
trees.Values.OrderBy(tree => tree.Order).ToArray(),
_generatingEntries,
_logger,
_constraintLogger,
version);
}
private void AddEntryToTree(UrlMatchingTree tree, TreeRouteMatchingEntry entry)
{
var current = tree.Root;
for (var i = 0; i < entry.RouteTemplate.Segments.Count; i++)
{
var segment = entry.RouteTemplate.Segments[i];
if (!segment.IsSimple)
{
// Treat complex segments as a constrained parameter
if (current.ConstrainedParameters == null)
{
current.ConstrainedParameters = new UrlMatchingNode(length: i + 1);
}
current = current.ConstrainedParameters;
continue;
}
Debug.Assert(segment.Parts.Count == 1);
var part = segment.Parts[0];
if (part.IsLiteral)
{
UrlMatchingNode next;
if (!current.Literals.TryGetValue(part.Text, out next))
{
next = new UrlMatchingNode(length: i + 1);
current.Literals.Add(part.Text, next);
}
current = next;
continue;
}
if (part.IsParameter && (part.IsOptional || part.IsCatchAll))
{
current.Matches.Add(entry);
}
if (part.IsParameter && part.InlineConstraints.Any() && !part.IsCatchAll)
{
if (current.ConstrainedParameters == null)
{
current.ConstrainedParameters = new UrlMatchingNode(length: i + 1);
}
current = current.ConstrainedParameters;
continue;
}
if (part.IsParameter && !part.IsCatchAll)
{
if (current.Parameters == null)
{
current.Parameters = new UrlMatchingNode(length: i + 1);
}
current = current.Parameters;
continue;
}
if (part.IsParameter && part.InlineConstraints.Any() && part.IsCatchAll)
{
if (current.ConstrainedCatchAlls == null)
{
current.ConstrainedCatchAlls = new UrlMatchingNode(length: i + 1) { IsCatchAll = true };
}
current = current.ConstrainedCatchAlls;
continue;
}
if (part.IsParameter && part.IsCatchAll)
{
if (current.CatchAlls == null)
{
current.CatchAlls = new UrlMatchingNode(length: i + 1) { IsCatchAll = true };
}
current = current.CatchAlls;
continue;
}
Debug.Fail("We shouldn't get here.");
}
current.Matches.Add(entry);
current.Matches.Sort((x, y) =>
{
var result = x.Precedence.CompareTo(y.Precedence);
return result == 0 ? x.RouteTemplate.TemplateText.CompareTo(y.RouteTemplate.TemplateText) : result;
});
}
internal static void AddEntryToTree(UrlMatchingTree tree, InboundRouteEntry entry)
{
// The url matching tree represents all the routes asociated with a given
// order. Each node in the tree represents all the different categories
// a segment can have for which there is a defined inbound route entry.
// Each node contains a set of Matches that indicate all the routes for which
// a URL is a potential match. This list contains the routes with the same
// number of segments and the routes with the same number of segments plus an
// additional catch all parameter (as it can be empty).
// For example, for a set of routes like:
// 'Customer/Index/{id}'
// '{Controller}/{Action}/{*parameters}'
//
// The route tree will look like:
// Root ->
// Literals: Customer ->
// Literals: Index ->
// Parameters: {id}
// Matches: 'Customer/Index/{id}'
// Parameters: {Controller} ->
// Parameters: {Action} ->
// Matches: '{Controller}/{Action}/{*parameters}'
// CatchAlls: {*parameters}
// Matches: '{Controller}/{Action}/{*parameters}'
//
// When the tree router tries to match a route, it iterates the list of url matching trees
// in ascending order. For each tree it traverses each node starting from the root in the
// following order: Literals, constrained parameters, parameters, constrained catch all routes, catch alls.
// When it gets to a node of the same length as the route its trying to match, it simply looks at the list of
// candidates (which is in precence order) and tries to match the url against it.
var current = tree.Root;
#if ROUTING
var routePattern = entry.RouteTemplate.ToRoutePattern();
var matcher = new TemplateMatcher(entry.RouteTemplate, entry.Defaults);
#elif DISPATCHER
var routePattern = entry.RoutePattern;
var matcher = new RoutePatternMatcher(routePattern, entry.Defaults);
#else
#error
#endif
for (var i = 0; i < routePattern.PathSegments.Count; i++)
{
var segment = routePattern.PathSegments[i];
if (!segment.IsSimple)
{
// Treat complex segments as a constrained parameter
if (current.ConstrainedParameters == null)
{
current.ConstrainedParameters = new UrlMatchingNode(i + 1);
}
current = current.ConstrainedParameters;
continue;
}
Debug.Assert(segment.Parts.Count == 1);
var part = segment.Parts[0];
if (part.IsLiteral)
{
var literal = (RoutePatternLiteral)part;
if (!current.Literals.TryGetValue(literal.Content, out var next))
{
next = new UrlMatchingNode(i + 1);
current.Literals.Add(literal.Content, next);
}
current = next;
continue;
}
// We accept templates that have intermediate optional values, but we ignore
// those values for route matching. For that reason, we need to add the entry
// to the list of matches, only if the remaining segments are optional. For example:
// /{controller}/{action=Index}/{id} will be equivalent to /{controller}/{action}/{id}
// for the purposes of route matching.
if (part.IsParameter &&
RemainingSegmentsAreOptional(routePattern.PathSegments, i))
{
#if ROUTING
current.Matches.Add(new InboundMatch()
{
Entry = entry, TemplateMatcher = matcher
});
#elif DISPATCHER
current.Matches.Add(new InboundMatch()
{
Entry = entry, RoutePatternMatcher = matcher
});
#else
#error
#endif
}
var parameter = (RoutePatternParameter)part;
if (parameter != null && parameter.Constraints.Any() && !parameter.IsCatchAll)
{
if (current.ConstrainedParameters == null)
{
current.ConstrainedParameters = new UrlMatchingNode(i + 1);
}
current = current.ConstrainedParameters;
continue;
}
if (parameter != null && !parameter.IsCatchAll)
{
if (current.Parameters == null)
{
current.Parameters = new UrlMatchingNode(i + 1);
}
current = current.Parameters;
continue;
}
if (parameter != null && parameter.Constraints.Any() && parameter.IsCatchAll)
{
if (current.ConstrainedCatchAlls == null)
{
current.ConstrainedCatchAlls = new UrlMatchingNode(i + 1)
{
IsCatchAll = true
};
}
current = current.ConstrainedCatchAlls;
continue;
}
if (parameter != null && parameter.IsCatchAll)
{
if (current.CatchAlls == null)
{
current.CatchAlls = new UrlMatchingNode(i + 1)
{
IsCatchAll = true
};
}
current = current.CatchAlls;
continue;
}
Debug.Fail("We shouldn't get here.");
}
#if ROUTING
current.Matches.Add(new InboundMatch()
{
Entry = entry, TemplateMatcher = matcher
});
current.Matches.Sort((x, y) =>
{
var result = x.Entry.Precedence.CompareTo(y.Entry.Precedence);
return(result == 0 ? x.Entry.RouteTemplate.TemplateText.CompareTo(y.Entry.RouteTemplate.TemplateText) : result);
});
#elif DISPATCHER
current.Matches.Add(new InboundMatch()
{
Entry = entry, RoutePatternMatcher = matcher
});
current.Matches.Sort((x, y) =>
{
var result = x.Entry.Precedence.CompareTo(y.Entry.Precedence);
return(result == 0 ? x.Entry.RoutePattern.RawText.CompareTo(y.Entry.RoutePattern.RawText) : result);
});
#else
#error
#endif
}
