AttributeCollection.cs :  » 2.6.4-mono-.net-core » System.Web » System » Web » UI » C# / CSharp Open Source

//
// System.Web.UI.AttributeCollection.cs
//
// Authors:
//   Duncan Mak  (duncan@ximian.com)
//   Gonzalo Paniagua (gonzalo@ximian.com)
//
// (C) 2002 Ximian, Inc. (http://www.ximian.com
// Copyright (C) 2005-2010 Novell, Inc (http://www.novell.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.Globalization;
using System.Security.Permissions;
using System.Web.Util;

namespace System.Web.UI{

  // CAS - no InheritanceDemand here as the class is sealed
  [AspNetHostingPermission (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  public sealed class AttributeCollection
  {
    StateBag bag;
    CssStyleCollection styleCollection;
    internal const string StyleAttribute = "style";
    
    public AttributeCollection (StateBag bag)
    {
      this.bag = bag;
    }

    public override bool Equals (object obj) 
    {
      AttributeCollection other = obj as AttributeCollection;
      if (other == null) {
        return false;
      }

      if (Count != other.Count) {
        return false;
      }

      foreach (string key in Keys) {
        if (0 == String.CompareOrdinal (key, StyleAttribute)) {
          continue;
        }
        if (0 == String.CompareOrdinal (other [key], this [key])) {
          return false;
        }
      }

      if ((styleCollection == null && other.styleCollection != null) ||
        (styleCollection != null && other.styleCollection == null)) {
        return false;
      }
      else if (styleCollection != null){
        // other.styleCollection != null too
        if (styleCollection.Count != other.styleCollection.Count){
          return false;
        }
        foreach (string styleKey in styleCollection.Keys){
          if (0 == String.CompareOrdinal(styleCollection [styleKey], other.styleCollection [styleKey])) {
            return false;
          }
        }
      }

      return true;
    }

    public override int GetHashCode () 
    {
      int hashValue = 0;
      
      foreach (string key in Keys) {
        if (key == StyleAttribute) {
          continue;
        }
        hashValue ^= key.GetHashCode ();
        string value = this [key];
        if (value != null) {
          hashValue ^= value.GetHashCode ();
        }
      }

      if (styleCollection != null) {
        foreach (string styleKey in styleCollection.Keys) {
          hashValue ^= styleCollection [styleKey].GetHashCode ();
          string styleValue = styleCollection [styleKey];
          if (styleValue != null) {
            hashValue ^= styleValue.GetHashCode ();
          }
        }
      }

      return hashValue;
    }

    public int Count {
      get { return bag.Count; }
    }

    public CssStyleCollection CssStyle {
      get {
        if (styleCollection == null)
          styleCollection = new CssStyleCollection (bag);
        return styleCollection;
      }
    }

    public string this [string key] {
      get { return bag [key] as string; }

      set {
        Add (key, value);
      }
    }

    public ICollection Keys {
      get { return bag.Keys; }
    }

    public void Add (string key, string value)
    {
      if (0 == String.Compare (key, StyleAttribute, true, Helpers.InvariantCulture)) {
        CssStyle.Value = value;
        return;
      }
      bag.Add (key, value);
    }

    public void AddAttributes (HtmlTextWriter writer)
    {
      foreach (string key in bag.Keys) {
        string value = bag [key] as string;
        writer.AddAttribute (key, value);
      }
    }

    public void Clear ()
    {
      CssStyle.Clear ();
      bag.Clear ();
    }

    public void Remove (string key)
    {
      if (0 == String.Compare (key, StyleAttribute, true, Helpers.InvariantCulture)) {
        CssStyle.Clear ();
        return;
      }
      bag.Remove (key);
    }

    public void Render (HtmlTextWriter writer)
    {
      foreach (string key in bag.Keys) {
        string value = bag [key] as string;
        if (value != null)
          writer.WriteAttribute (key, value, true);
      }
    }

    internal void CopyFrom (AttributeCollection attributeCollection)
    {
      if (attributeCollection == null || attributeCollection.Count == 0)
        return;

      foreach (string key in attributeCollection.bag.Keys)
        this.Add (key, attributeCollection [key]);
    }
  }
}