class/System/System.ComponentModel/AttributeCollection.cs

   1 //
   2 // System.ComponentModel.AttributeCollection.cs
   3 //
   4 // Authors:
   5 //      Rodrigo Moya (rodrigo@ximian.com)
   6 //      Gonzalo Paniagua Javier (gonzalo@ximian.com)
   7 //
   8 // (C) 2002 Ximian, Inc. (http://www.ximian.com)
   9 //
  10
  11 //
  12 // Permission is hereby granted, free of charge, to any person obtaining
  13 // a copy of this software and associated documentation files (the
  14 // "Software"), to deal in the Software without restriction, including
  15 // without limitation the rights to use, copy, modify, merge, publish,
  16 // distribute, sublicense, and/or sell copies of the Software, and to
  17 // permit persons to whom the Software is furnished to do so, subject to
  18 // the following conditions:
  19 //
  20 // The above copyright notice and this permission notice shall be
  21 // included in all copies or substantial portions of the Software.
  22 //
  23 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  27 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  28 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  29 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  30 //
  31
  32 using System;
  33 using System.Collections;
  34 using System.Reflection;
  35 using System.Runtime.InteropServices;
  36
  37 namespace System.ComponentModel
  38 {
  39         [ComVisible (true)]
  40         public class AttributeCollection : ICollection
  41         {
  42                 private ArrayList attrList = new ArrayList ();
  43                 public static readonly AttributeCollection Empty = new AttributeCollection ((ArrayList)null);
  44
  45                 internal AttributeCollection (ArrayList attributes)
  46                 {
  47                         if (attributes != null)
  48                                 attrList = attributes;
  49                 }
  50
  51 #if NET_2_0
  52                 public AttributeCollection (params Attribute[] attributes)
  53 #else
  54                 public AttributeCollection (Attribute[] attributes)
  55 #endif
  56                 {
  57                         if (attributes != null)
  58                                 for (int i = 0; i < attributes.Length; i++)
  59                                         attrList.Add (attributes[i]);
  60                 }
  61
  62 #if NET_2_0
  63                 public static AttributeCollection FromExisting (AttributeCollection existing, params Attribute [] newAttributes)
  64                 {
  65                         if (existing == null)
  66                                 throw new ArgumentNullException ("existing");
  67                         AttributeCollection ret = new AttributeCollection ();
  68                         ret.attrList.AddRange (existing.attrList);
  69                         if (newAttributes != null)
  70                                 ret.attrList.AddRange (newAttributes);
  71                         return ret;
  72                 }
  73 #endif
  74
  75                 public bool Contains (Attribute attr)
  76                 {
  77                         Attribute at = this [attr.GetType ()];
  78                         if (at != null)
  79                                 return attr.Equals (at);
  80                         else
  81                                 return false;
  82                 }
  83
  84                 public bool Contains (Attribute [] attributes)
  85                 {
  86                         if (attributes == null)
  87                                 return true;
  88
  89                         foreach (Attribute attr in attributes)
  90                                 if (!Contains (attr))
  91                                         return false;
  92
  93                         return true;
  94                 }
  95
  96                 public void CopyTo (Array array, int index)
  97                 {
  98                         attrList.CopyTo (array, index);
  99                 }
 100
 101                 IEnumerator IEnumerable.GetEnumerator () {
 102                         return GetEnumerator ();
 103                 }
 104
 105                 public IEnumerator GetEnumerator ()
 106                 {
 107                         return attrList.GetEnumerator ();
 108                 }
 109
 110                 public bool Matches (Attribute attr)
 111                 {
 112                         foreach (Attribute a in attrList)
 113                                 if (a.Match (attr))
 114                                         return true;
 115                         return false;
 116                 }
 117
 118                 public bool Matches (Attribute [] attributes)
 119                 {
 120                         foreach (Attribute a in attributes)
 121                                 if (!(Matches (a)))
 122                                         return false;
 123                         return true;
 124                 }
 125
 126                 protected Attribute GetDefaultAttribute (Type attributeType)
 127                 {
 128                         Attribute attr = null;
 129                         BindingFlags bf = BindingFlags.Public | BindingFlags.Static;
 130
 131                         FieldInfo def = attributeType.GetField ("Default", bf);
 132                         if (def == null) {
 133                                 ConstructorInfo constructorInfo = attributeType.GetConstructor (Type.EmptyTypes);
 134                                 if (constructorInfo != null)
 135                                         attr = constructorInfo.Invoke (null) as Attribute;
 136                                 if (attr != null && !attr.IsDefaultAttribute ())
 137                                         attr = null;
 138                         } else {
 139                                 attr = (Attribute) def.GetValue (null);
 140                         }
 141
 142                         return attr;
 143                 }
 144
 145                 bool ICollection.IsSynchronized {
 146                         get {
 147                                 return attrList.IsSynchronized;
 148                         }
 149                 }
 150
 151                 object ICollection.SyncRoot {
 152                         get {
 153                                 return attrList.SyncRoot;
 154                         }
 155                 }
 156
 157                 int ICollection.Count {
 158                         get {
 159                                 return Count;
 160                         }
 161                 }
 162
 163                 public int Count {
 164                         get {
 165                                 return attrList != null ? attrList.Count : 0;
 166                         }
 167                 }
 168
 169                 public virtual Attribute this[Type type] {
 170                         get {
 171                                 Attribute attr = null;
 172                                 if (attrList != null) {
 173                                         foreach (Attribute a in attrList) {
 174                                                 if (type.IsAssignableFrom (a.GetType ())) {
 175                                                         attr = a;
 176                                                         break;
 177                                                 }
 178                                         }
 179                                 }
 180
 181                                 if (attr == null)
 182                                         attr = GetDefaultAttribute (type);
 183
 184                                 return attr;
 185                         }
 186                 }
 187
 188                 public virtual Attribute this[int index] {
 189                         get {
 190                                 return (Attribute) attrList [index];
 191                         }
 192                 }
 193         }
 194 }