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//
// System.Net.WebRequest
//
// Author:
// Lawrence Pit (loz@cable.a2000.nl)
//
using System;
using System.Collections;
using System.Collections.Specialized;
using System.IO;
using System.Runtime.Serialization;
namespace System.Net
{
[Serializable]
public abstract class WebRequest : MarshalByRefObject, ISerializable
{
private static HybridDictionary prefixes;
static WebRequest () {
prefixes = new HybridDictionary (3, true);
RegisterPrefix ("file", new FileWebRequestCreator ());
RegisterPrefix ("http", new HttpWebRequestCreator ());
RegisterPrefix ("https", new HttpWebRequestCreator ());
}
internal class HttpWebRequestCreator : IWebRequestCreate
{
internal HttpWebRequestCreator () { }
public WebRequest Create (Uri uri)
{
return new HttpWebRequest (uri);
}
}
internal class FileWebRequestCreator : IWebRequestCreate
{
internal FileWebRequestCreator () { }
public WebRequest Create (Uri uri)
{
return new FileWebRequest (uri);
}
}
// Constructors
protected WebRequest () { }
protected WebRequest (SerializationInfo serializationInfo, StreamingContext streamingContext)
{
throw new NotSupportedException ();
}
// Properties
public virtual string ConnectionGroupName {
get { throw new NotSupportedException (); }
set { throw new NotSupportedException (); }
}
public virtual long ContentLength {
get { throw new NotSupportedException (); }
set { throw new NotSupportedException (); }
}
public virtual string ContentType {
get { throw new NotSupportedException (); }
set { throw new NotSupportedException (); }
}
public virtual ICredentials Credentials {
get { throw new NotSupportedException (); }
set { throw new NotSupportedException (); }
}
public virtual WebHeaderCollection Headers {
get { throw new NotSupportedException (); }
set { throw new NotSupportedException (); }
}
public virtual string Method {
get { throw new NotSupportedException (); }
set { throw new NotSupportedException (); }
}
public virtual bool PreAuthenticate {
get { throw new NotSupportedException (); }
set { throw new NotSupportedException (); }
}
public virtual IWebProxy Proxy {
get { throw new NotSupportedException (); }
set { throw new NotSupportedException (); }
}
public virtual Uri RequestUri {
get { throw new NotSupportedException (); }
set { throw new NotSupportedException (); }
}
public virtual int Timeout {
get { throw new NotSupportedException (); }
set { throw new NotSupportedException (); }
}
// Methods
public virtual void Abort()
{
throw new NotSupportedException ();
}
public virtual IAsyncResult BeginGetRequestStream (AsyncCallback callback, object state)
{
throw new NotSupportedException ();
}
public virtual IAsyncResult BeginGetResponse (AsyncCallback callback, object state)
{
throw new NotSupportedException ();
}
public static WebRequest Create (string requestUriString)
{
if (requestUriString == null)
throw new ArgumentNullException ("requestUriString");
return Create (new Uri (requestUriString));
}
public static WebRequest Create (Uri requestUri)
{
if (requestUri == null)
throw new ArgumentNullException ("requestUri");
return GetCreator (requestUri.AbsoluteUri).Create (requestUri);
}
public static WebRequest CreateDefault (Uri requestUri)
{
if (requestUri == null)
throw new ArgumentNullException ("requestUri");
return GetCreator (requestUri.Scheme).Create (requestUri);
}
public virtual Stream EndGetRequestStream (IAsyncResult asyncResult)
{
throw new NotSupportedException ();
}
public virtual WebResponse EndGetResponse (IAsyncResult asyncResult)
{
throw new NotSupportedException ();
}
public virtual Stream GetRequestStream()
{
throw new NotSupportedException ();
}
public virtual WebResponse GetResponse()
{
throw new NotSupportedException ();
}
void ISerializable.GetObjectData (SerializationInfo serializationInfo,
StreamingContext streamingContext)
{
throw new NotSupportedException ();
}
public static bool RegisterPrefix (string prefix, IWebRequestCreate creator)
{
if (prefix == null)
throw new ArgumentNullException("prefix");
if (creator == null)
throw new ArgumentNullException("creator");
lock (prefixes.SyncRoot) {
if (prefixes.Contains (prefix))
return false;
prefixes.Add (prefix.ToLower (), creator);
}
return true;
}
private static IWebRequestCreate GetCreator (string prefix)
{
int longestPrefix = -1;
IWebRequestCreate creator = null;
prefix = prefix.ToLower ();
IDictionaryEnumerator e = prefixes.GetEnumerator ();
while (e.MoveNext ()) {
string key = e.Key as string;
if (key.Length <= longestPrefix)
continue;
if (!prefix.StartsWith (key))
continue;
longestPrefix = key.Length;
creator = (IWebRequestCreate) e.Value;
}
if (creator == null)
throw new NotSupportedException (prefix);
return creator;
}
}
}
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