Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / CompMod / System / ComponentModel / AttributeCollection.cs / 1 / AttributeCollection.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- using System.Diagnostics.CodeAnalysis; /* This class has the HostProtectionAttribute. The purpose of this attribute is to enforce host-specific programming model guidelines, not security behavior. Suppress FxCop message - BUT REVISIT IF ADDING NEW SECURITY ATTRIBUTES. */ [assembly: SuppressMessage("Microsoft.Security", "CA2112:SecuredTypesShouldNotExposeFields", Scope="type", Target="System.ComponentModel.AttributeCollection")] [assembly: SuppressMessage("Microsoft.Security", "CA2112:SecuredTypesShouldNotExposeFields", Scope="type", Target="System.ComponentModel.AttributeCollection")] [assembly: SuppressMessage("Microsoft.Security", "CA2123:OverrideLinkDemandsShouldBeIdenticalToBase", Scope="member", Target="System.ComponentModel.AttributeCollection.CopyTo(System.Array,System.Int32):System.Void")] [assembly: SuppressMessage("Microsoft.Security", "CA2123:OverrideLinkDemandsShouldBeIdenticalToBase", Scope="member", Target="System.ComponentModel.AttributeCollection.System.Collections.IEnumerable.GetEnumerator():System.Collections.IEnumerator")] [assembly: SuppressMessage("Microsoft.Security", "CA2123:OverrideLinkDemandsShouldBeIdenticalToBase", Scope="member", Target="System.ComponentModel.AttributeCollection.System.Collections.ICollection.get_IsSynchronized():System.Boolean")] [assembly: SuppressMessage("Microsoft.Security", "CA2123:OverrideLinkDemandsShouldBeIdenticalToBase", Scope="member", Target="System.ComponentModel.AttributeCollection.System.Collections.ICollection.get_Count():System.Int32")] [assembly: SuppressMessage("Microsoft.Security", "CA2123:OverrideLinkDemandsShouldBeIdenticalToBase", Scope="member", Target="System.ComponentModel.AttributeCollection.System.Collections.ICollection.get_SyncRoot():System.Object")] [assembly: SuppressMessage("Microsoft.Security", "CA2122:DoNotIndirectlyExposeMethodsWithLinkDemands", Scope="member", Target="System.ComponentModel.AttributeCollection.Contains(System.Attribute):System.Boolean")] [assembly: SuppressMessage("Microsoft.Security", "CA2122:DoNotIndirectlyExposeMethodsWithLinkDemands", Scope="member", Target="System.ComponentModel.AttributeCollection.CopyTo(System.Array,System.Int32):System.Void")] [assembly: SuppressMessage("Microsoft.Security", "CA2122:DoNotIndirectlyExposeMethodsWithLinkDemands", Scope="member", Target="System.ComponentModel.AttributeCollection..ctor(System.Attribute[])")] [assembly: SuppressMessage("Microsoft.Security", "CA2122:DoNotIndirectlyExposeMethodsWithLinkDemands", Scope="member", Target="System.ComponentModel.AttributeCollection.GetEnumerator():System.Collections.IEnumerator")] [assembly: SuppressMessage("Microsoft.Security", "CA2122:DoNotIndirectlyExposeMethodsWithLinkDemands", Scope="member", Target="System.ComponentModel.AttributeCollection.get_Item(System.Type):System.Attribute")] [assembly: SuppressMessage("Microsoft.Security", "CA2122:DoNotIndirectlyExposeMethodsWithLinkDemands", Scope="member", Target="System.ComponentModel.AttributeCollection.get_Item(System.Int32):System.Attribute")] [assembly: SuppressMessage("Microsoft.Security", "CA2122:DoNotIndirectlyExposeMethodsWithLinkDemands", Scope="member", Target="System.ComponentModel.AttributeCollection.get_Count():System.Int32")] namespace System.ComponentModel { using System.Reflection; using System.Diagnostics; using System.Collections; ////// Represents a collection of attributes. /// [System.Runtime.InteropServices.ComVisibleAttribute(true)] [System.Security.Permissions.HostProtection(Synchronization=true)] public class AttributeCollection : ICollection { ////// An empty AttributeCollection that can used instead of creating a new one. /// public static readonly AttributeCollection Empty = new AttributeCollection((Attribute[])null); private static Hashtable _defaultAttributes; private Attribute[] _attributes; private static object internalSyncObject = new object(); private struct AttributeEntry { public Type type; public int index; } private const int FOUND_TYPES_LIMIT = 5; private AttributeEntry[] _foundAttributeTypes; private int _index = 0; ////// Creates a new AttributeCollection. /// public AttributeCollection(params Attribute[] attributes) { if (attributes == null) { attributes = new Attribute[0]; } _attributes = attributes; for (int idx = 0; idx < attributes.Length; idx++) { if (attributes[idx] == null) { throw new ArgumentNullException("attributes"); } } } ////// Creates a new AttributeCollection from an existing AttributeCollection /// public static AttributeCollection FromExisting(AttributeCollection existing, params Attribute[] newAttributes) { // VSWhidbey #75418 // This method should be a constructor, but making it one introduces a breaking change. // if (existing == null) { throw new ArgumentNullException("existing"); } if (newAttributes == null) { newAttributes = new Attribute[0]; } Attribute[] newArray = new Attribute[existing.Count + newAttributes.Length]; int actualCount = existing.Count; existing.CopyTo(newArray, 0); for (int idx = 0; idx < newAttributes.Length; idx++) { if (newAttributes[idx] == null) { throw new ArgumentNullException("newAttributes"); } // We must see if this attribute is already in the existing // array. If it is, we replace it. bool match = false; for (int existingIdx = 0; existingIdx < existing.Count; existingIdx++) { if (newArray[existingIdx].TypeId.Equals(newAttributes[idx].TypeId)) { match = true; newArray[existingIdx] = newAttributes[idx]; break; } } if (!match) { newArray[actualCount++] = newAttributes[idx]; } } // Now, if we collapsed some attributes, create a new array. // Attribute[] attributes = null; if (actualCount < newArray.Length) { attributes = new Attribute[actualCount]; Array.Copy(newArray, 0, attributes, 0, actualCount); } else { attributes = newArray; } return new AttributeCollection(attributes); } ////// Gets the number of attributes. /// public int Count { get { return _attributes.Length; } } ////// Gets the attribute with the specified index number. /// public virtual Attribute this[int index] { get { return _attributes[index]; } } ////// Gets the attribute with the specified type. /// public virtual Attribute this[Type attributeType] { get { lock (internalSyncObject) { // 2 passes here for perf. Really! first pass, we just // check equality, and if we don't find it, then we // do the IsAssignableFrom dance. Turns out that's // a relatively expensive call and we try to avoid it // since we rarely encounter derived attribute types // and this list is usually short. // if (_foundAttributeTypes == null) { _foundAttributeTypes = new AttributeEntry[FOUND_TYPES_LIMIT]; } int ind = 0; for (; ind < FOUND_TYPES_LIMIT; ind++) { if (_foundAttributeTypes[ind].type == attributeType) { int index = _foundAttributeTypes[ind].index; if (index != -1) { return _attributes[index]; } else{ return GetDefaultAttribute(attributeType); } } if (_foundAttributeTypes[ind].type == null) break; } ind = _index++; if (_index >= FOUND_TYPES_LIMIT) { _index = 0; } _foundAttributeTypes[ind].type = attributeType; int count = _attributes.Length; for (int i = 0; i < count; i++) { Attribute attribute = _attributes[i]; Type aType = attribute.GetType(); if (aType == attributeType) { _foundAttributeTypes[ind].index = i; return attribute; } } // now check the hierarchies. for (int i = 0; i < count; i++) { Attribute attribute = _attributes[i]; Type aType = attribute.GetType(); if (attributeType.IsAssignableFrom(aType)) { _foundAttributeTypes[ind].index = i; return attribute; } } _foundAttributeTypes[ind].index = -1; return GetDefaultAttribute(attributeType); } } } ////// Determines if this collection of attributes has the specified attribute. /// public bool Contains(Attribute attribute) { Attribute attr = this[attribute.GetType()]; if (attr != null && attr.Equals(attribute)) { return true; } return false; } ////// Determines if this attribute collection contains the all /// the specified attributes in the attribute array. /// public bool Contains(Attribute[] attributes) { if (attributes == null) { return true; } for (int i = 0; i < attributes.Length; i++) { if (!Contains(attributes[i])) { return false; } } return true; } ////// Returns the default value for an attribute. This uses the following hurestic: /// 1. It looks for a public static field named "Default". /// protected Attribute GetDefaultAttribute(Type attributeType) { lock (internalSyncObject) { if (_defaultAttributes == null) { _defaultAttributes = new Hashtable(); } // If we have already encountered this, use what's in the // table. if (_defaultAttributes.ContainsKey(attributeType)) { return(Attribute)_defaultAttributes[attributeType]; } Attribute attr = null; // Nope, not in the table, so do the legwork to discover the default value. Type reflect = TypeDescriptor.GetReflectionType(attributeType); System.Reflection.FieldInfo field = reflect.GetField("Default", BindingFlags.Public | BindingFlags.Static | BindingFlags.GetField); if (field != null && field.IsStatic) { attr = (Attribute)field.GetValue(null); } else { ConstructorInfo ci = reflect.UnderlyingSystemType.GetConstructor(new Type[0]); if (ci != null) { attr = (Attribute)ci.Invoke(new object[0]); // If we successfully created, verify that it is the // default. Attributes don't have to abide by this rule. if (!attr.IsDefaultAttribute()) { attr = null; } } } _defaultAttributes[attributeType] = attr; return attr; } } ////// Gets an enumerator for this collection. /// public IEnumerator GetEnumerator() { return _attributes.GetEnumerator(); } ////// Determines if a specified attribute is the same as an attribute /// in the collection. /// public bool Matches(Attribute attribute) { for (int i = 0; i < _attributes.Length; i++) { if (_attributes[i].Match(attribute)) { return true; } } return false; } ////// Determines if the attributes in the specified array are /// the same as the attributes in the collection. /// public bool Matches(Attribute[] attributes) { for (int i = 0; i < attributes.Length; i++) { if (!Matches(attributes[i])) { return false; } } return true; } ///int ICollection.Count { get { return Count; } } /// bool ICollection.IsSynchronized { get { return false; } } /// object ICollection.SyncRoot { get { return null; } } /// /// Copies this collection to an array. /// public void CopyTo(Array array, int index) { Array.Copy(_attributes, 0, array, index, _attributes.Length); } ///IEnumerator IEnumerable.GetEnumerator() { return GetEnumerator(); } } }
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