mcs/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, IEnumerable
  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                         attrList = attributes;
  48                 }
  49
  50                 public AttributeCollection (Attribute[] attributes)
  51                 {
  52                         if (attributes != null)
  53                                 for (int i = 0; i < attributes.Length; i++)
  54                                         attrList.Add (attributes[i]);
  55                 }
  56
  57                 public bool Contains (Attribute attr)
  58                 {
  59                         return attrList.Contains (attr);
  60                 }
  61
  62                 public bool Contains (Attribute [] attributes)
  63                 {
  64                         if (attributes == null)
  65                                 return true;
  66
  67                         foreach (Attribute attr in attributes)
  68                                 if (!Contains (attr))
  69                                         return false;
  70
  71                         return true;
  72                 }
  73
  74                 public void CopyTo (Array array, int index)
  75                 {
  76                         attrList.CopyTo (array, index);
  77                 }
  78
  79                 public IEnumerator GetEnumerator ()
  80                 {
  81                         return attrList.GetEnumerator ();
  82                 }
  83
  84                 public bool Matches (Attribute attr)
  85                 {
  86                         foreach (Attribute a in attrList)
  87                                 if (a.Match (attr))
  88                                         return true;
  89                         return false;
  90                 }
  91
  92                 public bool Matches (Attribute [] attributes)
  93                 {
  94                         foreach (Attribute a in attributes)
  95                                 if (!(Matches (a)))
  96                                         return false;
  97                         return true;
  98                 }
  99
 100                 protected Attribute GetDefaultAttribute (Type attributeType)
 101                 {
 102                         Attribute attr = null;
 103                         BindingFlags bf = BindingFlags.Public | BindingFlags.Static;
 104
 105                         FieldInfo def = attributeType.GetField ("Default", bf);
 106                         if (def == null) {
 107                                 ConstructorInfo constructorInfo = attributeType.GetConstructor (Type.EmptyTypes);
 108                                 if (constructorInfo != null)
 109                                         attr = constructorInfo.Invoke (null) as Attribute;
 110                                 if (attr != null && !attr.IsDefaultAttribute ())
 111                                         attr = null;
 112                         } else {
 113                                 attr = (Attribute) def.GetValue (null);
 114                         }
 115
 116                         return attr;
 117                 }
 118
 119                 bool ICollection.IsSynchronized {
 120                         get {
 121                                 return attrList.IsSynchronized;
 122                         }
 123                 }
 124
 125                 object ICollection.SyncRoot {
 126                         get {
 127                                 return attrList.SyncRoot;
 128                         }
 129                 }
 130
 131                 public int Count {
 132                         get {
 133                                 return attrList.Count;
 134                         }
 135                 }
 136
 137                 public virtual Attribute this[Type type] {
 138                         get {
 139                                 Attribute attr = null;
 140                                 foreach (Attribute a in attrList) {
 141                                         if (type.IsAssignableFrom (a.GetType ())) {
 142                                                 attr = a;
 143                                                 break;
 144                                         }
 145                                 }
 146
 147                                 if (attr == null)
 148                                         attr = GetDefaultAttribute (type);
 149
 150                                 return attr;
 151                         }
 152                 }
 153
 154                 public virtual Attribute this[int index] {
 155                         get {
 156                                 return (Attribute) attrList [index];
 157                         }
 158                 }
 159         }
 160 }