FilteredReadOnlyMetadataCollection.cs source code in C# .NET

                        Code:
                         / Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / Orcas / SP / ndp / fx / src / DataEntity / System / Data / Metadata / Edm / FilteredReadOnlyMetadataCollection.cs / 3 / FilteredReadOnlyMetadataCollection.cs
                        
                        
                            //---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner  [....], [....]
//--------------------------------------------------------------------- 
 
using System;
using System.Collections; 
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Data.Common;
using System.Diagnostics; 
using System.Reflection;
using System.Text; 
 
namespace System.Data.Metadata.Edm
{ 
    internal interface IBaseList : IList
    {
        T this[string identity] { get;}
 
        new T this[int index] { get;}
 
        int IndexOf(T item); 
    }
 
#pragma warning disable 1711 // compiler bug: reports TDerived and TBase as type parameters for non-existing IsReadOnly property
    /// 
    /// Class to filter stuff out from a metadata collection
    ///  
    /*
 
 
*/
    internal class FilteredReadOnlyMetadataCollection : ReadOnlyMetadataCollection, IBaseList 
                where TDerived : TBase
                where TBase : MetadataItem
    {
        #region Constructors 
        /// 
        /// The constructor for constructing a read-only metadata collection to wrap another MetadataCollection. 
        ///  
        /// The metadata collection to wrap
        /// Thrown if collection argument is null 
        /// Predicate method which determines membership
        internal FilteredReadOnlyMetadataCollection(ReadOnlyMetadataCollection collection, Predicate predicate) : base(FilterCollection(collection, predicate))
        {
            Debug.Assert(collection != null); 
            Debug.Assert(collection.IsReadOnly, "wrappers should only be created once loading is over, and this collection is still loading");
            _source = collection; 
            _predicate = predicate; 

        } 
        #endregion

        #region Private Fields
        // The original metadata collection over which this filtered collection is the view 
        private readonly ReadOnlyMetadataCollection _source;
        private readonly Predicate _predicate; 
        #endregion 

        #region Properties 

        /// 
        /// Gets an item from the collection with the given identity
        ///  
        /// The identity of the item to search for
        /// An item from the collection 
        /// Thrown if identity argument passed in is null 
        /// Thrown if setter is called
        public override TDerived this[string identity] 
        {
            get
            {
                TBase item = _source[identity]; 
                if (_predicate(item))
                { 
                    return (TDerived)item; 
                }
                throw EntityUtil.ItemInvalidIdentity(identity, "identity"); 
            }
        }

        #endregion 

        #region Methods 
        ///  
        /// Gets an item from the collection with the given identity
        ///  
        /// The identity of the item to search for
        /// Whether case is ignore in the search
        /// An item from the collection
        /// Thrown if identity argument passed in is null 
        /// Thrown if the Collection does not have an item with the given identity
        public override TDerived GetValue(string identity, bool ignoreCase) 
        { 
            TBase item = _source.GetValue(identity, ignoreCase);
 
            if (_predicate(item))
            {
                return (TDerived)item;
            } 
            throw EntityUtil.ItemInvalidIdentity(identity, "identity");
        } 
 
        /// 
        /// Determines if this collection contains an item of the given identity 
        /// 
        /// The identity of the item to check for
        /// True if the collection contains the item with the given identity
        /// Thrown if identity argument passed in is null 
        /// Thrown if identity argument passed in is empty string
        public override bool Contains(string identity) 
        { 
            TBase item;
            if (_source.TryGetValue(identity, false/*ignoreCase*/, out item)) 
            {
                return (_predicate(item));
            }
            return false; 
        }
 
        ///  
        /// Gets an item from the collection with the given identity
        ///  
        /// The identity of the item to search for
        /// Whether case is ignore in the search
        /// An item from the collection, null if the item is not found
        /// True an item is retrieved 
        /// if identity argument is null
        public override bool TryGetValue(string identity, bool ignoreCase, out TDerived item) 
        { 
            item = null;
            TBase baseTypeItem; 
            if (_source.TryGetValue(identity, ignoreCase, out baseTypeItem))
            {
                if (_predicate(baseTypeItem))
                { 
                    item = (TDerived)baseTypeItem;
                    return true; 
                } 
            }
            return false; 
        }

        internal static List FilterCollection(ReadOnlyMetadataCollection collection, Predicate predicate)
        { 
            List list = new List(collection.Count);
            foreach (TBase item in collection) 
            { 
                if (predicate(item))
                { 
                    list.Add((TDerived)item);
                }
            }
 
            return list;
        } 
 
        /// 
        /// Get index of the element passed as the argument 
        /// 
        /// 
        /// 
        public override int IndexOf(TDerived value) 
        {
            TBase item; 
            if (_source.TryGetValue(value.Identity, false /*ignoreCase*/, out item)) 
            {
                if (_predicate(item)) 
                {
                    // Since we are gauranteed to have a unique identity per collection, this item must of T Type
                    return base.IndexOf((TDerived)item);
                } 
            }
            return -1; 
        } 

        #endregion 

        #region IBaseList Members

        TBase IBaseList.this[string identity] 
        {
            get { return this[identity]; } 
        } 

        TBase IBaseList.this[int index] 
        {
            get
            {
                return this[index]; 
            }
        } 
 
        /// 
        /// Get index of the element passed as the argument 
        /// 
        /// 
        /// 
        int IBaseList.IndexOf(TBase item) 
        {
            if (_predicate(item)) 
            { 
                return this.IndexOf((TDerived)item);
            } 

            return -1;
        }
 
        #endregion
    } 
#pragma warning restore 1711 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner  [....], [....]
//--------------------------------------------------------------------- 
 
using System;
using System.Collections; 
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Data.Common;
using System.Diagnostics; 
using System.Reflection;
using System.Text; 
 
namespace System.Data.Metadata.Edm
{ 
    internal interface IBaseList : IList
    {
        T this[string identity] { get;}
 
        new T this[int index] { get;}
 
        int IndexOf(T item); 
    }
 
#pragma warning disable 1711 // compiler bug: reports TDerived and TBase as type parameters for non-existing IsReadOnly property
    /// 
    /// Class to filter stuff out from a metadata collection
    ///  
    /*
 
 
*/
    internal class FilteredReadOnlyMetadataCollection : ReadOnlyMetadataCollection, IBaseList 
                where TDerived : TBase
                where TBase : MetadataItem
    {
        #region Constructors 
        /// 
        /// The constructor for constructing a read-only metadata collection to wrap another MetadataCollection. 
        ///  
        /// The metadata collection to wrap
        /// Thrown if collection argument is null 
        /// Predicate method which determines membership
        internal FilteredReadOnlyMetadataCollection(ReadOnlyMetadataCollection collection, Predicate predicate) : base(FilterCollection(collection, predicate))
        {
            Debug.Assert(collection != null); 
            Debug.Assert(collection.IsReadOnly, "wrappers should only be created once loading is over, and this collection is still loading");
            _source = collection; 
            _predicate = predicate; 

        } 
        #endregion

        #region Private Fields
        // The original metadata collection over which this filtered collection is the view 
        private readonly ReadOnlyMetadataCollection _source;
        private readonly Predicate _predicate; 
        #endregion 

        #region Properties 

        /// 
        /// Gets an item from the collection with the given identity
        ///  
        /// The identity of the item to search for
        /// An item from the collection 
        /// Thrown if identity argument passed in is null 
        /// Thrown if setter is called
        public override TDerived this[string identity] 
        {
            get
            {
                TBase item = _source[identity]; 
                if (_predicate(item))
                { 
                    return (TDerived)item; 
                }
                throw EntityUtil.ItemInvalidIdentity(identity, "identity"); 
            }
        }

        #endregion 

        #region Methods 
        ///  
        /// Gets an item from the collection with the given identity
        ///  
        /// The identity of the item to search for
        /// Whether case is ignore in the search
        /// An item from the collection
        /// Thrown if identity argument passed in is null 
        /// Thrown if the Collection does not have an item with the given identity
        public override TDerived GetValue(string identity, bool ignoreCase) 
        { 
            TBase item = _source.GetValue(identity, ignoreCase);
 
            if (_predicate(item))
            {
                return (TDerived)item;
            } 
            throw EntityUtil.ItemInvalidIdentity(identity, "identity");
        } 
 
        /// 
        /// Determines if this collection contains an item of the given identity 
        /// 
        /// The identity of the item to check for
        /// True if the collection contains the item with the given identity
        /// Thrown if identity argument passed in is null 
        /// Thrown if identity argument passed in is empty string
        public override bool Contains(string identity) 
        { 
            TBase item;
            if (_source.TryGetValue(identity, false/*ignoreCase*/, out item)) 
            {
                return (_predicate(item));
            }
            return false; 
        }
 
        ///  
        /// Gets an item from the collection with the given identity
        ///  
        /// The identity of the item to search for
        /// Whether case is ignore in the search
        /// An item from the collection, null if the item is not found
        /// True an item is retrieved 
        /// if identity argument is null
        public override bool TryGetValue(string identity, bool ignoreCase, out TDerived item) 
        { 
            item = null;
            TBase baseTypeItem; 
            if (_source.TryGetValue(identity, ignoreCase, out baseTypeItem))
            {
                if (_predicate(baseTypeItem))
                { 
                    item = (TDerived)baseTypeItem;
                    return true; 
                } 
            }
            return false; 
        }

        internal static List FilterCollection(ReadOnlyMetadataCollection collection, Predicate predicate)
        { 
            List list = new List(collection.Count);
            foreach (TBase item in collection) 
            { 
                if (predicate(item))
                { 
                    list.Add((TDerived)item);
                }
            }
 
            return list;
        } 
 
        /// 
        /// Get index of the element passed as the argument 
        /// 
        /// 
        /// 
        public override int IndexOf(TDerived value) 
        {
            TBase item; 
            if (_source.TryGetValue(value.Identity, false /*ignoreCase*/, out item)) 
            {
                if (_predicate(item)) 
                {
                    // Since we are gauranteed to have a unique identity per collection, this item must of T Type
                    return base.IndexOf((TDerived)item);
                } 
            }
            return -1; 
        } 

        #endregion 

        #region IBaseList Members

        TBase IBaseList.this[string identity] 
        {
            get { return this[identity]; } 
        } 

        TBase IBaseList.this[int index] 
        {
            get
            {
                return this[index]; 
            }
        } 
 
        /// 
        /// Get index of the element passed as the argument 
        /// 
        /// 
        /// 
        int IBaseList.IndexOf(TBase item) 
        {
            if (_predicate(item)) 
            { 
                return this.IndexOf((TDerived)item);
            } 

            return -1;
        }
 
        #endregion
    } 
#pragma warning restore 1711 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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FilteredReadOnlyMetadataCollection.cs source code in C# .NET

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