RelationshipEndCollection.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / EntityModel / SchemaObjectModel / RelationshipEndCollection.cs / 1305376 / RelationshipEndCollection.cs
                        
                        
                            //---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner       [....]
// @backupOwner [....] 
//--------------------------------------------------------------------- 

using System; 
using System.Collections;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Diagnostics; 
using System.Data;
using System.Data.Metadata.Edm; 
 

namespace System.Data.EntityModel.SchemaObjectModel 
{
    /// 
    /// A collection of RelationshipEnds
    ///  
    internal sealed class RelationshipEndCollection : IList
    { 
        private Dictionary _endLookup = null; 
        private List _keysInDefOrder = null;
 
        /// 
        /// construct a RelationshipEndCollection
        /// 
        public RelationshipEndCollection() 
        {
        } 
 
        /// 
        /// How many RelationshipEnds are in the collection 
        /// 
        public int Count
        {
            get 
            {
                return KeysInDefOrder.Count; 
            } 
        }
 
        /// 
        /// Add a relationship end
        /// 
        /// the end to add 
        public void Add(IRelationshipEnd end)
        { 
            Debug.Assert(end != null, "end parameter is null"); 

            SchemaElement endElement = end as SchemaElement; 
            Debug.Assert(endElement != null, "end is not a SchemaElement");

            // this should have been caught before this, just ignore it
            if ( !IsEndValid(end) ) 
                return;
 
            if ( !ValidateUniqueName(endElement, end.Name)) 
                return;
 
            EndLookup.Add(end.Name,end);
            KeysInDefOrder.Add(end.Name);
        }
 
        /// 
        /// See if an end can be added to the collection 
        ///  
        /// the end to add
        /// true if the end is valid, false otherwise 
        private static bool IsEndValid(IRelationshipEnd end)
        {
            return !string.IsNullOrEmpty(end.Name);
        } 

        ///  
        /// 
        /// 
        ///  
        /// 
        /// 
        private bool ValidateUniqueName(SchemaElement end, string name)
        { 
            if ( EndLookup.ContainsKey(name) )
            { 
                end.AddError( ErrorCode.AlreadyDefined, EdmSchemaErrorSeverity.Error, 
                    System.Data.Entity.Strings.EndNameAlreadyDefinedDuplicate(name));
                return false; 
            }

            return true;
        } 

        ///  
        /// Remove a relationship end 
        /// 
        /// the end to remove 
        /// true if item was in list
        public bool Remove(IRelationshipEnd end)
        {
            Debug.Assert(end != null, "end parameter is null"); 

            if ( !IsEndValid(end) ) 
                return false; 

            KeysInDefOrder.Remove(end.Name); 
            bool wasInList = EndLookup.Remove(end.Name);

            return wasInList;
        } 

        ///  
        /// See if a relationship end is in the collection 
        /// 
        /// the name of the end 
        /// true if the end name is in the collection
        public bool Contains(string name)
        {
            return EndLookup.ContainsKey(name); 
        }
 
        ///  
        /// See if a relationship end is in the collection
        ///  
        /// the name of the end
        /// true if the end is in the collection
        public bool Contains(IRelationshipEnd end)
        { 
            Debug.Assert(end != null, "end parameter is null");
 
            return Contains(end.Name); 
        }
 
        public IRelationshipEnd this[int index]
        {
            get
            { 
                return EndLookup[KeysInDefOrder[index]];
            } 
            set 
            {
                throw EntityUtil.NotSupported(); 
            }
        }

        ///  
        /// get a typed enumerator for the collection
        ///  
        /// the enumerator 
        public IEnumerator GetEnumerator()
        { 
            return new Enumerator(EndLookup,KeysInDefOrder);
        }

        public bool TryGetEnd( string name, out IRelationshipEnd end ) 
        {
            return EndLookup.TryGetValue( name, out end ); 
        } 

        ///  
        /// get an un-typed enumerator for the collection
        /// 
        /// the enumerator
        IEnumerator System.Collections.IEnumerable.GetEnumerator() 
        {
            return new Enumerator(EndLookup,KeysInDefOrder); 
        } 

        ///  
        /// The data for the collection
        /// 
        private Dictionary EndLookup
        { 
            get
            { 
                if ( _endLookup == null ) 
                    _endLookup = new Dictionary(StringComparer.Ordinal);
 
                return _endLookup;
            }
        }
 
        /// 
        /// the definition order collection 
        ///  
        private List KeysInDefOrder
        { 
            get
            {
                if ( _keysInDefOrder == null )
                    _keysInDefOrder = new List(); 

                return _keysInDefOrder; 
            } 
        }
 
        /// 
        /// remove all elements from the collection
        /// 
        public void Clear() 
        {
            EndLookup.Clear(); 
            KeysInDefOrder.Clear(); 
        }
 
        /// 
        /// can the collection be modified
        /// 
        public bool IsReadOnly 
        {
            get 
            { 
                return false;
            } 
        }

        /// 
        /// Not supported 
        /// 
        /// the end 
        /// nothing 
        int IList.IndexOf(IRelationshipEnd end)
        { 
            throw EntityUtil.NotSupported();
        }

        ///  
        /// Not supported
        ///  
        /// the index 
        /// the end
        void IList.Insert(int index, IRelationshipEnd end) 
        {
            throw EntityUtil.NotSupported();
        }
 
        /// 
        /// Not supported 
        ///  
        /// the index
        void IList.RemoveAt(int index) 
        {
            throw EntityUtil.NotSupported();
        }
 
        /// 
        /// copy all elements to an array 
        ///  
        /// array to copy to
        /// The zero-based index in array at which copying begins. 
        public void CopyTo(IRelationshipEnd[] ends, int index )
        {
            Debug.Assert(ends.Length-index >= Count);
            foreach ( IRelationshipEnd end in this ) 
                ends[index++] = end;
        } 
 
        /// 
        /// enumerator for the RelationshipEnd collection 
        /// the ends as traversed in the order in which they were added
        /// 
        private sealed class Enumerator : IEnumerator
        { 
            private List.Enumerator _Enumerator;
            private Dictionary _Data = null; 
 
            /// 
            /// construct the enumerator 
            /// 
            /// the real data
            /// the keys to the real data in inserted order
            public Enumerator(Dictionary data, List keysInDefOrder) 
            {
                Debug.Assert(data != null); 
                Debug.Assert(keysInDefOrder != null); 
                _Enumerator = keysInDefOrder.GetEnumerator();
                _Data = data; 
            }

            /// 
            /// reset the enumerator 
            /// 
            public void Reset() 
            { 
                // reset is implemented explicitly
                ((IEnumerator)_Enumerator).Reset(); 
            }

            /// 
            /// get current relationship end from the enumerator 
            /// 
            public IRelationshipEnd Current 
            { 
                get
                { 
                    return _Data[_Enumerator.Current];
                }
            }
 
            /// 
            /// get current relationship end from the enumerator 
            ///  
            object System.Collections.IEnumerator.Current
            { 
                get
                {
                    return _Data[_Enumerator.Current];
                } 
            }
 
            ///  
            /// move to the next element in the collection
            ///  
            /// true if there is a next, false if not
            public bool MoveNext()
            {
                return _Enumerator.MoveNext(); 
            }
 
            ///  
            /// dispose of the enumerator
            ///  
            public void Dispose()
            {
            }
        } 
    }
} 

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

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