MetadataPropertyCollection.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / Orcas / QFE / ndp / fx / src / DataEntity / System / Data / Metadata / Edm / MetadataPropertyCollection.cs / 2 / MetadataPropertyCollection.cs

                            //---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner  [....],[....]
//--------------------------------------------------------------------- 
 
using System;
using System.Collections.Generic; 
using System.Data.Common;
using System.Diagnostics;
using System.Reflection;
using System.Data.Common.Utils; 

namespace System.Data.Metadata.Edm 
{ 
    /// 
    /// Metadata collection class supporting delay-loading of system item attributes and 
    /// extended attributes.
    /// 
    internal sealed class MetadataPropertyCollection : MetadataCollection
    { 
        /// 
        /// Constructor taking item. 
        ///  
        /// Item with which the collection is associated.
        internal MetadataPropertyCollection(MetadataItem item) 
            : base(GetSystemMetadataProperties(item))
        {
        }
 
        private readonly static Memoizer s_itemTypeMemoizer =
            new Memoizer(clrType => new ItemTypeInformation(clrType), null); 
 
        // Given an item, returns all system type attributes for the item.
        private static IEnumerable GetSystemMetadataProperties(MetadataItem item) 
        {
            EntityUtil.CheckArgumentNull(item, "item");
            Type type = item.GetType();
            ItemTypeInformation itemTypeInformation = GetItemTypeInformation(type); 
            return itemTypeInformation.GetItemAttributes(item);
        } 
 
        // Retrieves metadata for type.
        private static ItemTypeInformation GetItemTypeInformation(Type clrType) 
        {
            return s_itemTypeMemoizer.Evaluate(clrType);
        }
 
        /// 
        /// Encapsulates information about system item attributes for a particular item type. 
        ///  
        private class ItemTypeInformation
        { 
            /// 
            /// Retrieves system attribute information for the given type.
            /// Requires: type must derive from MetadataItem
            ///  
            /// Type
            internal ItemTypeInformation(Type clrType) 
            { 
                Debug.Assert(null != clrType);
 
                _itemProperties = GetItemProperties(clrType);
            }

            private readonly List _itemProperties; 

            // Returns system item attributes for the given item. 
            internal IEnumerable GetItemAttributes(MetadataItem item) 
            {
                foreach (ItemPropertyInfo propertyInfo in _itemProperties) 
                {
                    yield return propertyInfo.GetMetadataProperty(item);
                }
            } 

            // Gets type information for item with the given type. Uses cached information where 
            // available. 
            private static List GetItemProperties(Type clrType)
            { 
                List result = new List();
                foreach (PropertyInfo propertyInfo in clrType.GetProperties(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic))
                {
                    foreach (MetadataPropertyAttribute attribute in propertyInfo.GetCustomAttributes( 
                        typeof(MetadataPropertyAttribute), false))
                    { 
                        result.Add(new ItemPropertyInfo(propertyInfo, attribute)); 
                    }
                } 
                return result;
            }
        }
 

        ///  
        /// Encapsulates information about a CLR property of an item class. 
        /// 
        private class ItemPropertyInfo 
        {
            /// 
            /// Initialize information.
            /// Requires: attribute must belong to the given property. 
            /// 
            /// Property referenced. 
            /// Attribute for the property. 
            internal ItemPropertyInfo(PropertyInfo propertyInfo, MetadataPropertyAttribute attribute)
            { 
                Debug.Assert(null != propertyInfo);
                Debug.Assert(null != attribute);

                _propertyInfo = propertyInfo; 
                _attribute = attribute;
            } 
 
            private readonly MetadataPropertyAttribute _attribute;
            private readonly PropertyInfo _propertyInfo; 

            /// 
            /// Given an item, returns an instance of the item attribute described by this class.
            ///  
            /// Item from which to retrieve attribute.
            /// Item attribute. 
            internal MetadataProperty GetMetadataProperty(MetadataItem item) 
            {
                return new MetadataProperty(_propertyInfo.Name, _attribute.Type, _attribute.IsCollectionType, 
                    new MetadataPropertyValue(_propertyInfo, item));
            }
        }
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner  [....],[....]
//--------------------------------------------------------------------- 
 
using System;
using System.Collections.Generic; 
using System.Data.Common;
using System.Diagnostics;
using System.Reflection;
using System.Data.Common.Utils; 

namespace System.Data.Metadata.Edm 
{ 
    /// 
    /// Metadata collection class supporting delay-loading of system item attributes and 
    /// extended attributes.
    /// 
    internal sealed class MetadataPropertyCollection : MetadataCollection
    { 
        /// 
        /// Constructor taking item. 
        ///  
        /// Item with which the collection is associated.
        internal MetadataPropertyCollection(MetadataItem item) 
            : base(GetSystemMetadataProperties(item))
        {
        }
 
        private readonly static Memoizer s_itemTypeMemoizer =
            new Memoizer(clrType => new ItemTypeInformation(clrType), null); 
 
        // Given an item, returns all system type attributes for the item.
        private static IEnumerable GetSystemMetadataProperties(MetadataItem item) 
        {
            EntityUtil.CheckArgumentNull(item, "item");
            Type type = item.GetType();
            ItemTypeInformation itemTypeInformation = GetItemTypeInformation(type); 
            return itemTypeInformation.GetItemAttributes(item);
        } 
 
        // Retrieves metadata for type.
        private static ItemTypeInformation GetItemTypeInformation(Type clrType) 
        {
            return s_itemTypeMemoizer.Evaluate(clrType);
        }
 
        /// 
        /// Encapsulates information about system item attributes for a particular item type. 
        ///  
        private class ItemTypeInformation
        { 
            /// 
            /// Retrieves system attribute information for the given type.
            /// Requires: type must derive from MetadataItem
            ///  
            /// Type
            internal ItemTypeInformation(Type clrType) 
            { 
                Debug.Assert(null != clrType);
 
                _itemProperties = GetItemProperties(clrType);
            }

            private readonly List _itemProperties; 

            // Returns system item attributes for the given item. 
            internal IEnumerable GetItemAttributes(MetadataItem item) 
            {
                foreach (ItemPropertyInfo propertyInfo in _itemProperties) 
                {
                    yield return propertyInfo.GetMetadataProperty(item);
                }
            } 

            // Gets type information for item with the given type. Uses cached information where 
            // available. 
            private static List GetItemProperties(Type clrType)
            { 
                List result = new List();
                foreach (PropertyInfo propertyInfo in clrType.GetProperties(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic))
                {
                    foreach (MetadataPropertyAttribute attribute in propertyInfo.GetCustomAttributes( 
                        typeof(MetadataPropertyAttribute), false))
                    { 
                        result.Add(new ItemPropertyInfo(propertyInfo, attribute)); 
                    }
                } 
                return result;
            }
        }
 

        ///  
        /// Encapsulates information about a CLR property of an item class. 
        /// 
        private class ItemPropertyInfo 
        {
            /// 
            /// Initialize information.
            /// Requires: attribute must belong to the given property. 
            /// 
            /// Property referenced. 
            /// Attribute for the property. 
            internal ItemPropertyInfo(PropertyInfo propertyInfo, MetadataPropertyAttribute attribute)
            { 
                Debug.Assert(null != propertyInfo);
                Debug.Assert(null != attribute);

                _propertyInfo = propertyInfo; 
                _attribute = attribute;
            } 
 
            private readonly MetadataPropertyAttribute _attribute;
            private readonly PropertyInfo _propertyInfo; 

            /// 
            /// Given an item, returns an instance of the item attribute described by this class.
            ///  
            /// Item from which to retrieve attribute.
            /// Item attribute. 
            internal MetadataProperty GetMetadataProperty(MetadataItem item) 
            {
                return new MetadataProperty(_propertyInfo.Name, _attribute.Type, _attribute.IsCollectionType, 
                    new MetadataPropertyValue(_propertyInfo, item));
            }
        }
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
                        

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