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) 2005-2010 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 using System.Web.Util;
  35
  36 namespace System.Web.UI {
  37
  38         // CAS - no InheritanceDemand here as the class is sealed
  39         [AspNetHostingPermission (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  40         public sealed class AttributeCollection
  41         {
  42                 StateBag bag;
  43                 CssStyleCollection styleCollection;
  44                 internal const string StyleAttribute = "style";
  45
  46                 public AttributeCollection (StateBag bag)
  47                 {
  48                         this.bag = bag;
  49                 }
  50
  51                 public override bool Equals (object o)
  52                 {
  53                         AttributeCollection other = o as AttributeCollection;
  54                         if (other == null) {
  55                                 return false;
  56                         }
  57
  58                         if (Count != other.Count) {
  59                                 return false;
  60                         }
  61
  62                         foreach (string key in Keys) {
  63                                 if (0 == String.CompareOrdinal (key, StyleAttribute)) {
  64                                         continue;
  65                                 }
  66                                 if (0 == String.CompareOrdinal (other [key], this [key])) {
  67                                         return false;
  68                                 }
  69                         }
  70
  71                         if ((styleCollection == null && other.styleCollection != null) ||
  72                                 (styleCollection != null && other.styleCollection == null)) {
  73                                 return false;
  74                         }
  75                         else if (styleCollection != null){
  76                                 // other.styleCollection != null too
  77                                 if (styleCollection.Count != other.styleCollection.Count){
  78                                         return false;
  79                                 }
  80                                 foreach (string styleKey in styleCollection.Keys){
  81                                         if (0 == String.CompareOrdinal(styleCollection [styleKey], other.styleCollection [styleKey])) {
  82                                                 return false;
  83                                         }
  84                                 }
  85                         }
  86
  87                         return true;
  88                 }
  89
  90                 public override int GetHashCode ()
  91                 {
  92                         int hashValue = 0;
  93
  94                         foreach (string key in Keys) {
  95                                 if (key == StyleAttribute) {
  96                                         continue;
  97                                 }
  98                                 hashValue ^= key.GetHashCode ();
  99                                 string value = this [key];
 100                                 if (value != null) {
 101                                         hashValue ^= value.GetHashCode ();
 102                                 }
 103                         }
 104
 105                         if (styleCollection != null) {
 106                                 foreach (string styleKey in styleCollection.Keys) {
 107                                         hashValue ^= styleCollection [styleKey].GetHashCode ();
 108                                         string styleValue = styleCollection [styleKey];
 109                                         if (styleValue != null) {
 110                                                 hashValue ^= styleValue.GetHashCode ();
 111                                         }
 112                                 }
 113                         }
 114
 115                         return hashValue;
 116                 }
 117
 118                 public int Count {
 119                         get { return bag.Count; }
 120                 }
 121
 122                 public CssStyleCollection CssStyle {
 123                         get {
 124                                 if (styleCollection == null)
 125                                         styleCollection = new CssStyleCollection (bag);
 126                                 return styleCollection;
 127                         }
 128                 }
 129
 130                 public string this [string key] {
 131                         get { return bag [key] as string; }
 132
 133                         set {
 134                                 Add (key, value);
 135                         }
 136                 }
 137
 138                 public ICollection Keys {
 139                         get { return bag.Keys; }
 140                 }
 141
 142                 public void Add (string key, string value)
 143                 {
 144                         if (0 == String.Compare (key, StyleAttribute, true, Helpers.InvariantCulture)) {
 145                                 CssStyle.Value = value;
 146                                 return;
 147                         }
 148                         bag.Add (key, value);
 149                 }
 150
 151                 public void AddAttributes (HtmlTextWriter writer)
 152                 {
 153                         foreach (string key in bag.Keys) {
 154                                 string value = bag [key] as string;
 155                                 writer.AddAttribute (key, value);
 156                         }
 157                 }
 158
 159                 public void Clear ()
 160                 {
 161                         CssStyle.Clear ();
 162                         bag.Clear ();
 163                 }
 164
 165                 public void Remove (string key)
 166                 {
 167                         if (0 == String.Compare (key, StyleAttribute, true, Helpers.InvariantCulture)) {
 168                                 CssStyle.Clear ();
 169                                 return;
 170                         }
 171                         bag.Remove (key);
 172                 }
 173
 174                 public void Render (HtmlTextWriter writer)
 175                 {
 176                         foreach (string key in bag.Keys) {
 177                                 string value = bag [key] as string;
 178                                 if (value != null)
 179                                         writer.WriteAttribute (key, value, true);
 180                         }
 181                 }
 182
 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         }
 192 }