mcs/class/System.Web/System.Web.UI/AttributeCollection.cs

   1 //
   2 // System.Web.UI.AttributeCollection.cs
   3 //
   4 // Authors:
   5 //      Duncan Mak  (duncan@ximian.com)
   6 //      Gonzalo Paniagua (gonzalo@ximian.com)
   7 //
   8 // (C) 2002 Ximian, Inc. (http://www.ximian.com
   9 // Copyright (C) 2005 Novell, Inc (http://www.novell.com)
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30
  31 using System.Collections;
  32 using System.Globalization;
  33 using System.Security.Permissions;
  34
  35 namespace System.Web.UI {
  36
  37         // CAS - no InheritanceDemand here as the class is sealed
  38         [AspNetHostingPermission (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  39         public sealed class AttributeCollection
  40         {
  41                 StateBag bag;
  42                 CssStyleCollection styleCollection;
  43                 internal const string StyleAttribute = "style";
  44
  45                 public AttributeCollection (StateBag bag)
  46                 {
  47                         this.bag = bag;
  48                 }
  49
  50                 public override bool Equals (object obj)
  51                 {
  52                         AttributeCollection other = obj as AttributeCollection;
  53                         if (other == null) {
  54                                 return false;
  55                         }
  56
  57                         if (Count != other.Count) {
  58                                 return false;
  59                         }
  60
  61                         foreach (string key in Keys) {
  62                                 if (0 == String.CompareOrdinal (key, StyleAttribute)) {
  63                                         continue;
  64                                 }
  65                                 if (0 == String.CompareOrdinal (other [key], this [key])) {
  66                                         return false;
  67                                 }
  68                         }
  69
  70                         if ((styleCollection == null && other.styleCollection != null) ||
  71                                 (styleCollection != null && other.styleCollection == null)) {
  72                                 return false;
  73                         }
  74                         else if (styleCollection != null){
  75                                 // other.styleCollection != null too
  76                                 if (styleCollection.Count != other.styleCollection.Count){
  77                                         return false;
  78                                 }
  79                                 foreach (string styleKey in styleCollection.Keys){
  80                                         if (0 == String.CompareOrdinal(styleCollection [styleKey], other.styleCollection [styleKey])) {
  81                                                 return false;
  82                                         }
  83                                 }
  84                         }
  85
  86                         return true;
  87                 }
  88
  89                 public override int GetHashCode ()
  90                 {
  91                         int hashValue = 0;
  92
  93                         foreach (string key in Keys) {
  94                                 if (key == StyleAttribute) {
  95                                         continue;
  96                                 }
  97                                 hashValue ^= key.GetHashCode ();
  98                                 string value = this [key];
  99                                 if (value != null) {
 100                                         hashValue ^= value.GetHashCode ();
 101                                 }
 102                         }
 103
 104                         if (styleCollection != null) {
 105                                 foreach (string styleKey in styleCollection.Keys) {
 106                                         hashValue ^= styleCollection [styleKey].GetHashCode ();
 107                                         string styleValue = styleCollection [styleKey];
 108                                         if (styleValue != null) {
 109                                                 hashValue ^= styleValue.GetHashCode ();
 110                                         }
 111                                 }
 112                         }
 113
 114                         return hashValue;
 115                 }
 116
 117                 public int Count {
 118                         get { return bag.Count; }
 119                 }
 120
 121                 public CssStyleCollection CssStyle {
 122                         get {
 123                                 if (styleCollection == null)
 124                                         styleCollection = new CssStyleCollection (bag);
 125                                 return styleCollection;
 126                         }
 127                 }
 128
 129                 public string this [string key] {
 130                         get { return bag [key] as string; }
 131
 132                         set {
 133                                 Add (key, value);
 134                         }
 135                 }
 136
 137                 public ICollection Keys {
 138                         get { return bag.Keys; }
 139                 }
 140
 141                 public void Add (string key, string value)
 142                 {
 143                         if (0 == String.Compare (key, StyleAttribute, true, CultureInfo.InvariantCulture)) {
 144                                 CssStyle.Value = value;
 145                                 return;
 146                         }
 147                         bag.Add (key, value);
 148                 }
 149
 150                 public void AddAttributes (HtmlTextWriter writer)
 151                 {
 152                         foreach (string key in bag.Keys) {
 153                                 string value = bag [key] as string;
 154                                 writer.AddAttribute (key, value);
 155                         }
 156                 }
 157
 158                 public void Clear ()
 159                 {
 160                         CssStyle.Clear ();
 161                         bag.Clear ();
 162                 }
 163
 164                 public void Remove (string key)
 165                 {
 166                         if (0 == String.Compare (key, StyleAttribute, true, CultureInfo.InvariantCulture)) {
 167                                 CssStyle.Clear ();
 168                                 return;
 169                         }
 170                         bag.Remove (key);
 171                 }
 172
 173                 public void Render (HtmlTextWriter writer)
 174                 {
 175                         foreach (string key in bag.Keys) {
 176                                 string value = bag [key] as string;
 177                                 if (value != null)
 178                                         writer.WriteAttribute (key, value, true);
 179                         }
 180                 }
 181
 182 #if NET_2_0
 183                 internal void CopyFrom (AttributeCollection attributeCollection)
 184                 {
 185                         if (attributeCollection == null || attributeCollection.Count == 0)
 186                                 return;
 187
 188                         foreach (string key in attributeCollection.bag.Keys)
 189                                 this.Add (key, attributeCollection [key]);
 190                 }
 191 #endif
 192         }
 193 }