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                         Attribute at = this [attr.GetType ()];
  60                         if (at != null)
  61                                 return attr.Equals (at);
  62                         else
  63                                 return false;
  64                 }
  65
  66                 public bool Contains (Attribute [] attributes)
  67                 {
  68                         if (attributes == null)
  69                                 return true;
  70
  71                         foreach (Attribute attr in attributes)
  72                                 if (!Contains (attr))
  73                                         return false;
  74
  75                         return true;
  76                 }
  77
  78                 public void CopyTo (Array array, int index)
  79                 {
  80                         attrList.CopyTo (array, index);
  81                 }
  82
  83                 public IEnumerator GetEnumerator ()
  84                 {
  85                         return attrList.GetEnumerator ();
  86                 }
  87
  88                 public bool Matches (Attribute attr)
  89                 {
  90                         foreach (Attribute a in attrList)
  91                                 if (a.Match (attr))
  92                                         return true;
  93                         return false;
  94                 }
  95
  96                 public bool Matches (Attribute [] attributes)
  97                 {
  98                         foreach (Attribute a in attributes)
  99                                 if (!(Matches (a)))
 100                                         return false;
 101                         return true;
 102                 }
 103
 104                 protected Attribute GetDefaultAttribute (Type attributeType)
 105                 {
 106                         Attribute attr = null;
 107                         BindingFlags bf = BindingFlags.Public | BindingFlags.Static;
 108
 109                         FieldInfo def = attributeType.GetField ("Default", bf);
 110                         if (def == null) {
 111                                 ConstructorInfo constructorInfo = attributeType.GetConstructor (Type.EmptyTypes);
 112                                 if (constructorInfo != null)
 113                                         attr = constructorInfo.Invoke (null) as Attribute;
 114                                 if (attr != null && !attr.IsDefaultAttribute ())
 115                                         attr = null;
 116                         } else {
 117                                 attr = (Attribute) def.GetValue (null);
 118                         }
 119
 120                         return attr;
 121                 }
 122
 123                 bool ICollection.IsSynchronized {
 124                         get {
 125                                 return attrList.IsSynchronized;
 126                         }
 127                 }
 128
 129                 object ICollection.SyncRoot {
 130                         get {
 131                                 return attrList.SyncRoot;
 132                         }
 133                 }
 134
 135                 public int Count {
 136                         get {
 137                                 return attrList.Count;
 138                         }
 139                 }
 140
 141                 public virtual Attribute this[Type type] {
 142                         get {
 143                                 Attribute attr = null;
 144                                 foreach (Attribute a in attrList) {
 145                                         if (type.IsAssignableFrom (a.GetType ())) {
 146                                                 attr = a;
 147                                                 break;
 148                                         }
 149                                 }
 150
 151                                 if (attr == null)
 152                                         attr = GetDefaultAttribute (type);
 153
 154                                 return attr;
 155                         }
 156                 }
 157
 158                 public virtual Attribute this[int index] {
 159                         get {
 160                                 return (Attribute) attrList [index];
 161                         }
 162                 }
 163         }
 164 }