ConnectionManagementHandler.cs :  » 2.6.4-mono-.net-core » System.Net » System » Net » Configuration » C# / CSharp Open Source

//
// System.Net.Configuration.ConnectionManagementHandler
//
// Authors:
//  Gonzalo Paniagua Javier (gonzalo@ximian.com)
//
// (C) 2003 Ximian, Inc (http://www.ximian.com)
//

//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

using System.Collections;
using System.Configuration;
#if (XML_DEP)
using System.Xml;
#else
using XmlNodeSystem.Object;
#endif

namespace System.Net.Configuration{
  class ConnectionManagementData
  {
    Hashtable data; // key -> address, value -> maxconnections
    const int defaultMaxConnections = 2;
    
    public ConnectionManagementData (object parent)
    {
      data = new Hashtable (CaseInsensitiveHashCodeProvider.DefaultInvariant,
                CaseInsensitiveComparer.DefaultInvariant);
      if (parent != null && parent is ConnectionManagementData) {
        ConnectionManagementData p = (ConnectionManagementData) parent;
        foreach (string k in p.data.Keys)
          data [k] = p.data [k];  
      }
    }

    public void Add (string address, string nconns)
    {
      if (nconns == null || nconns == "")
        nconns = "2";
      // Adding duplicates works fine under MS, so...
      data [address] = UInt32.Parse (nconns);
    }

    public void Add (string address, int nconns)
    {
      data [address] = (uint) nconns;
    }

    public void Remove (string address)
    {
      // Removing non-existent address is fine.
      data.Remove (address);
    }

    public void Clear ()
    {
      data.Clear ();
    }

    public uint GetMaxConnections (string hostOrIP)
    {
      object o = data [hostOrIP];
      if (o == null)
        o = data ["*"];

      if (o == null)
        return defaultMaxConnections;

      return (uint) o;
    }

    public Hashtable Data {
      get { return data; }
    }
  }

  class ConnectionManagementHandler : IConfigurationSectionHandler
  {
    public virtual object Create (object parent, object configContext, XmlNode section)
    {
      ConnectionManagementData cmd = new ConnectionManagementData (parent);
#if (XML_DEP)      
      if (section.Attributes != null && section.Attributes.Count != 0)
        HandlersUtil.ThrowException ("Unrecognized attribute", section);

      XmlNodeList httpHandlers = section.ChildNodes;
      foreach (XmlNode child in httpHandlers) {
        XmlNodeType ntype = child.NodeType;
        if (ntype == XmlNodeType.Whitespace || ntype == XmlNodeType.Comment)
          continue;

        if (ntype != XmlNodeType.Element)
          HandlersUtil.ThrowException ("Only elements allowed", child);
        
        string name = child.Name;
        if (name == "clear") {
          if (child.Attributes != null && child.Attributes.Count != 0)
            HandlersUtil.ThrowException ("Unrecognized attribute", child);

          cmd.Clear ();
          continue;
        }

        //LAMESPEC: the MS doc says that <remove name="..."/> but they throw an exception
        // if you use that. "address" is correct.

        string address = HandlersUtil.ExtractAttributeValue ("address", child);
        if (name == "add") {
          string maxcnc = HandlersUtil.ExtractAttributeValue ("maxconnection", child, true);
          if (child.Attributes != null && child.Attributes.Count != 0)
            HandlersUtil.ThrowException ("Unrecognized attribute", child);

          cmd.Add (address, maxcnc);
          continue;
        }

        if (name == "remove") {
          if (child.Attributes != null && child.Attributes.Count != 0)
            HandlersUtil.ThrowException ("Unrecognized attribute", child);

          cmd.Remove (address);
          continue;
        }

        HandlersUtil.ThrowException ("Unexpected element", child);
      }
#endif      

      return cmd;
    }
  }

  internal class HandlersUtil
  {
    private HandlersUtil ()
    {
    }
#if (XML_DEP)
    static internal string ExtractAttributeValue (string attKey, XmlNode node)
    {
      return ExtractAttributeValue (attKey, node, false);
    }
      
    static internal string ExtractAttributeValue (string attKey, XmlNode node, bool optional)
    {
      if (node.Attributes == null) {
        if (optional)
          return null;

        ThrowException ("Required attribute not found: " + attKey, node);
      }

      XmlNode att = node.Attributes.RemoveNamedItem (attKey);
      if (att == null) {
        if (optional)
          return null;
        ThrowException ("Required attribute not found: " + attKey, node);
      }

      string value = att.Value;
      if (value == String.Empty) {
        string opt = optional ? "Optional" : "Required";
        ThrowException (opt + " attribute is empty: " + attKey, node);
      }

      return value;
    }

    static internal void ThrowException (string msg, XmlNode node)
    {
      if (node != null && node.Name != String.Empty)
        msg = msg + " (node name: " + node.Name + ") ";
      throw new ConfigurationException (msg, node);
    }
#endif
  }
}