/// <summary>
/// This method adds a new request routing element to the
/// collection, consisting of a request pattern and a request
/// handler.
///
/// Preconditions
/// pattern != null
/// pattern.Length >= 3
/// handler != null
/// </summary>
/// <param name="pattern">Request pattern (method, path).</param>
/// <param name="handler">Request handler.</param>
public void Add(string pattern, RequestHandler handler)
{
Contract.Requires(pattern != null);
Contract.Requires(pattern.Length >= 3);
Contract.Requires(handler != null);
var e = Parse(pattern, handler);
Contract.Requires(e != null);
if (first == null)
{
first = e;
}
else
{
Element h = first;
while (h.next != null) { h = h.next; }
h.next = e;
}
}
void IEnumerator.Reset()
{
current = null;
}
internal Enumerator(Element first)
{
this.first = first;
}
bool IEnumerator.MoveNext()
{
if (current == null)
{
current = first;
}
else
{
current = current.next;
}
return (current != null);
}
internal bool RequestMatch(Element e)
{
Contract.Requires(e != null);
Contract.Requires(e.Path != null);
Contract.Requires(e.Path.Length > 0);
Contract.Requires(e.Path[0] == '/');
// Pattern = ( Method | '*') path [ '*' ]
string uri = RequestUri;
Contract.Requires(uri != null);
int uriLength = uri.Length;
Contract.Requires(uriLength >= 1);
if (uri[0] != '/') // some proxies return absolute URIs
{
return false;
}
string method = RequestMethod;
Contract.Requires(method != null);
int methodLength = method.Length;
Contract.Requires(methodLength >= 3);
if ((method != e.Method) && (e.Method != "*")) { return false; }
var pos = 1;
if (relayDomain != null) // try to match relay domain
{
int relayPrefixLength = relayDomain.Length + 1;
if (uriLength <= relayPrefixLength) { return false; }
while (pos != relayPrefixLength)
{
if (uri[pos] != relayDomain[pos - 1]) { return false; }
pos = pos + 1;
}
if (uri[pos] != '/') { return false; }
pos = pos + 1;
}
// try to match request pattern
int patternLength = e.Path.Length;
if (uriLength < (pos - 1 + patternLength)) { return false; }
var i = 1;
while (i != patternLength)
{
if (uri[pos] != e.Path[i]) { return false; }
pos = pos + 1;
i = i + 1;
}
return ((pos == uriLength) || (e.Wildcard));
}
