private static WebRequest CreateInternal(Uri requestUri)
{
if (requestUri == null)
{
throw new ArgumentNullException();
}
// Makes LookupUri lowercase since we need case-insensitive compare
// with prefix
string lookupUri = requestUri.AbsoluteUri.ToLower();
int lookupUriLent = lookupUri.Length;
// Walk down the list of prefixes.
int prefixListCount = s_PrefixList.Count;
for (int i = 0; i < prefixListCount; i++)
{
WebRequestPrefixElement Current = (WebRequestPrefixElement)s_PrefixList[i];
// See if this prefix is short enough.
int prefixLen = Current.Prefix.Length;
if (lookupUriLent >= prefixLen)
{
// It is. See if these match.
if (ComparePrefixString(lookupUri, Current.Prefix, prefixLen) == 0)
{
return(Current.Creator.Create(requestUri));
}
}
}
throw new NotSupportedException();
}
public static bool RegisterPrefix(string prefix, IWebRequestCreate creator)
{
bool flag = false;
if (prefix == null)
{
throw new ArgumentNullException("prefix");
}
if (creator == null)
{
throw new ArgumentNullException("creator");
}
ExceptionHelper.WebPermissionUnrestricted.Demand();
lock (InternalSyncObject)
{
Uri uri;
ArrayList list = (ArrayList)PrefixList.Clone();
if (Uri.TryCreate(prefix, UriKind.Absolute, out uri))
{
string absoluteUri = uri.AbsoluteUri;
if (!prefix.EndsWith("/", StringComparison.Ordinal) && uri.GetComponents(UriComponents.Fragment | UriComponents.PathAndQuery, UriFormat.UriEscaped).Equals("/"))
{
absoluteUri = absoluteUri.Substring(0, absoluteUri.Length - 1);
}
prefix = absoluteUri;
}
int index = 0;
while (index < list.Count)
{
WebRequestPrefixElement element = (WebRequestPrefixElement)list[index];
if (prefix.Length > element.Prefix.Length)
{
break;
}
if ((prefix.Length == element.Prefix.Length) && (string.Compare(element.Prefix, prefix, StringComparison.OrdinalIgnoreCase) == 0))
{
flag = true;
break;
}
index++;
}
if (!flag)
{
list.Insert(index, new WebRequestPrefixElement(prefix, creator));
PrefixList = list;
}
}
return(!flag);
}
private static WebRequest Create(Uri requestUri, bool useUriBase)
{
string absoluteUri;
if (Logging.On)
{
Logging.Enter(Logging.Web, "WebRequest", "Create", requestUri.ToString());
}
WebRequestPrefixElement element = null;
bool flag = false;
if (!useUriBase)
{
absoluteUri = requestUri.AbsoluteUri;
}
else
{
absoluteUri = requestUri.Scheme + ':';
}
int length = absoluteUri.Length;
ArrayList prefixList = PrefixList;
for (int i = 0; i < prefixList.Count; i++)
{
element = (WebRequestPrefixElement)prefixList[i];
if ((length >= element.Prefix.Length) && (string.Compare(element.Prefix, 0, absoluteUri, 0, element.Prefix.Length, StringComparison.OrdinalIgnoreCase) == 0))
{
flag = true;
break;
}
}
WebRequest retObject = null;
if (flag)
{
retObject = element.Creator.Create(requestUri);
if (Logging.On)
{
Logging.Exit(Logging.Web, "WebRequest", "Create", retObject);
}
return(retObject);
}
if (Logging.On)
{
Logging.Exit(Logging.Web, "WebRequest", "Create", (string)null);
}
throw new NotSupportedException(SR.GetString("net_unknown_prefix"));
}
/*++
*
* Create - Create a WebRequest.
*
* This is the main creation routine. We take a Uri object, look
* up the Uri in the prefix match table, and invoke the appropriate
* handler to create the object. We also have a parameter that
* tells us whether or not to use the whole Uri or just the
* scheme portion of it.
*
* Input:
*
* RequestUri - Uri object for request.
* UseUriBase - True if we're only to look at the scheme
* portion of the Uri.
*
* Returns:
*
* Newly created WebRequest.
* --*/
private static WebRequest Create(Uri requestUri, bool useUriBase)
{
if (Logging.On)
{
Logging.Enter(Logging.Web, "WebRequest", "Create", requestUri.ToString());
}
string LookupUri;
WebRequestPrefixElement Current = null;
bool Found = false;
if (!useUriBase)
{
LookupUri = requestUri.AbsoluteUri;
}
else
{
//
// schemes are registered as <schemeName>":", so add the separator
// to the string returned from the Uri object
//
LookupUri = requestUri.Scheme + ':';
}
int LookupLength = LookupUri.Length;
// Copy the prefix list so that if it is updated it will
// not affect us on this thread.
ArrayList prefixList = PrefixList;
// Look for the longest matching prefix.
// Walk down the list of prefixes. The prefixes are kept longest
// first. When we find a prefix that is shorter or the same size
// as this Uri, we'll do a compare to see if they match. If they
// do we'll break out of the loop and call the creator.
for (int i = 0; i < prefixList.Count; i++)
{
Current = (WebRequestPrefixElement)prefixList[i];
//
// See if this prefix is short enough.
//
if (LookupLength >= Current.Prefix.Length)
{
//
// It is. See if these match.
//
if (String.Compare(Current.Prefix,
0,
LookupUri,
0,
Current.Prefix.Length,
StringComparison.OrdinalIgnoreCase) == 0)
{
//
// These match. Remember that we found it and break
// out.
//
Found = true;
break;
}
}
}
WebRequest webRequest = null;
if (Found)
{
//
// We found a match, so just call the creator and return what it
// does.
//
webRequest = Current.Creator.Create(requestUri);
if (Logging.On)
{
Logging.Exit(Logging.Web, "WebRequest", "Create", webRequest);
}
return(webRequest);
}
if (Logging.On)
{
Logging.Exit(Logging.Web, "WebRequest", "Create", null);
}
//
// Otherwise no match, throw an exception.
//
throw new NotSupportedException(SR.GetString(SR.net_unknown_prefix));
}
