IRCollection.cs source code in C# .NET

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Code:

                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Security / Principal / IRCollection.cs / 1 / IRCollection.cs
                        

                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 

using System; 
using System.Collections; 
using System.Collections.Generic;
 
namespace System.Security.Principal
{
[System.Runtime.InteropServices.ComVisible(false)]
    public class IdentityReferenceCollection : ICollection 
    {
        #region Private members 
 
        //
        // Container enumerated by this collection 
        //

        private ArrayList _Identities;
 
        #endregion
 
        #region Constructors 

        // 
        // Creates an empty collection of default size
        //

        public IdentityReferenceCollection() 
            : this( 0 )
        { 
        } 

        // 
        // Creates an empty collection of given initial size
        //

        public IdentityReferenceCollection( int capacity ) 
        {
            _Identities = new ArrayList( capacity ); 
        } 

        #endregion 

        #region ICollection implementation

        public void CopyTo( IdentityReference[] array, int offset ) 
        {
            _Identities.CopyTo( 0, array, offset, Count ); 
        } 

        public int Count 
        {
            get { return _Identities.Count; }
        }
 
        public bool IsReadOnly
        { 
            get { return false; } 
        }
 
        public void Add( IdentityReference identity )
        {
            if ( identity == null )
            { 
                throw new ArgumentNullException( "identity" );
            } 
 
            _Identities.Add( identity );
        } 

        public bool Remove( IdentityReference identity )
        {
            if ( identity == null ) 
            {
                throw new ArgumentNullException( "identity" ); 
            } 

            if ( Contains( identity )) 
            {
                _Identities.Remove( identity );
                return true;
            } 

            return false; 
        } 

        public void Clear() 
        {
            _Identities.Clear();
        }
 
        public bool Contains( IdentityReference identity )
        { 
            if ( identity == null ) 
            {
                throw new ArgumentNullException( "identity" ); 
            }

            return _Identities.Contains( identity );
        } 

        #endregion 
 		 

        #region IEnumerable implementation 

        IEnumerator IEnumerable.GetEnumerator()
        {
	    return GetEnumerator(); 
        }
 
        public IEnumerator GetEnumerator() 
        {
            return new IdentityReferenceEnumerator( this ); 
        }

        #endregion
 
        #region Public methods
 
        public IdentityReference this[int index] 
        {
            get 
            {
                return _Identities[index] as IdentityReference;
            }
 
            set
            { 
                if ( value == null ) 
                {
                    throw new ArgumentNullException( "value" ); 
                }

                _Identities[index] = value;
            } 
        }
 
        internal ArrayList Identities 
        {
            get { return _Identities; } 
        }

        public IdentityReferenceCollection Translate( Type targetType )
        { 
            return Translate( targetType, false );
        } 
 
        public IdentityReferenceCollection Translate( Type targetType, bool forceSuccess )
        { 

            if ( targetType == null )
            {
                throw new ArgumentNullException( "targetType" ); 
            }
 
            // 
            // Target type must be a subclass of IdentityReference
            // 

            if ( !targetType.IsSubclassOf( typeof( IdentityReference )))
            {
                throw new ArgumentException( Environment.GetResourceString( "IdentityReference_MustBeIdentityReference" ), "targetType" ); 
            }
 
            // 
            // if the source collection is empty, just return an empty collection
            // 
            if (Identities.Count == 0)
            {
                return new IdentityReferenceCollection();
            } 

            int SourceSidsCount = 0; 
            int SourceNTAccountsCount = 0; 

            // 
            // First, see how many of each of the source types we have.
            // The cases where source type == target type require no conversion.
            //
 
            for ( int i = 0; i < Identities.Count; i++ )
            { 
                Type type = Identities[i].GetType(); 

                if ( type == targetType ) 
                {
                    continue;
                }
                else if ( type == typeof( SecurityIdentifier )) 
                {
                    SourceSidsCount += 1; 
                } 
                else if ( type == typeof( NTAccount ))
                { 
                    SourceNTAccountsCount += 1;
                }
                else
                { 
                    //
                    // Rare case that we have defined a type of identity reference and 
                    // not included it in the code logic above (this is more like a bug in the implementation 
                    // but only as long as we do not allow IdentityReference to be subclassed outside of the BCL)
                    // 
                    BCLDebug.Assert( false, "Source type is an IdentityReference type which has not been included in translation logic.");
                    throw new SystemException();
                }
            } 

            bool Homogeneous = false; 
            IdentityReferenceCollection SourceSids = null; 
            IdentityReferenceCollection SourceNTAccounts = null;
 
            if ( SourceSidsCount == Count )
            {
                Homogeneous = true;
                SourceSids = this; 
            }
            else if ( SourceSidsCount > 0 ) 
            { 
                SourceSids = new IdentityReferenceCollection( SourceSidsCount );
            } 

            if ( SourceNTAccountsCount == Count )
            {
                Homogeneous = true; 
                SourceNTAccounts = this;
            } 
            else if ( SourceNTAccountsCount > 0 ) 
            {
                SourceNTAccounts = new IdentityReferenceCollection( SourceNTAccountsCount ); 
            }
            //
            // Repackage only if the source is not homogeneous (contains different source types)
            // 

            IdentityReferenceCollection Result = null; 
 
            if ( !Homogeneous )
            { 
                Result = new IdentityReferenceCollection( Identities.Count );

                for ( int i = 0; i < Identities.Count; i++ )
                { 
                    IdentityReference id = this[i];
 
                    Type type = id.GetType(); 

                    if ( type == targetType ) 
                    {
                        continue;
                    }
                    else if ( type == typeof( SecurityIdentifier )) 
                    {
                        SourceSids.Add( id ); 
                    } 
                    else if ( type == typeof( NTAccount ))
                    { 
                        SourceNTAccounts.Add( id );
                    }
                    else
                    { 
                        //
                        // Rare case that we have defined a type of identity reference and 
                        // not included it in the code logic above (this is more like a bug in the implementation 
                        // but only as long as we do not allow IdentityReference to be subclassed outside of the BCL)
                        // 
                        BCLDebug.Assert( false, "Source type is an IdentityReference type which has not been included in translation logic.");
                        throw new SystemException();
                    }
                } 
            }
 
            bool someFailed = false; 
            IdentityReferenceCollection TargetSids = null, TargetNTAccounts = null;
 
            if ( SourceSidsCount > 0 )
            {
                TargetSids = SecurityIdentifier.Translate( SourceSids, targetType, out someFailed );
 
                if ( Homogeneous && !(forceSuccess && someFailed))
                { 
                    Result = TargetSids; 
                }
            } 

            if ( SourceNTAccountsCount > 0 )
            {
                TargetNTAccounts = NTAccount.Translate( SourceNTAccounts, targetType, out someFailed ); 

                if ( Homogeneous && !(forceSuccess && someFailed)) 
                { 
                    Result = TargetNTAccounts;
                } 
            }

            if (forceSuccess && someFailed) {
 
                //
                // Need to throw an exception here and provide information regarding 
                // which identity references could not be translated to the target type 
                //
 
                Result = new IdentityReferenceCollection();

                if (TargetSids != null) {
 
                    foreach (IdentityReference id in TargetSids) {
 
                        if ( id.GetType() != targetType ) 
                        {
                            Result.Add(id); 
                        }

                    }
                } 

                if (TargetNTAccounts != null) { 
 
                     foreach (IdentityReference id in TargetNTAccounts) {
 
                        if ( id.GetType() != targetType )
                        {
                            Result.Add(id);
                        } 

                    } 
                } 

                throw new IdentityNotMappedException( Environment.GetResourceString("IdentityReference_IdentityNotMapped"), Result); 

            }
            else if ( !Homogeneous )
            { 
                SourceSidsCount = 0;
                SourceNTAccountsCount = 0; 
 
                Result = new IdentityReferenceCollection( Identities.Count );
 
                for ( int i = 0; i < Identities.Count; i++ )
                {
                    IdentityReference id = this[i];
 
                    Type type = id.GetType();
 
                    if ( type == targetType ) 
                    {
                        Result.Add( id ); 
                    }
                    else if ( type == typeof( SecurityIdentifier ))
                    {
                        Result.Add( TargetSids[SourceSidsCount++] ); 
                    }
                    else if ( type == typeof( NTAccount )) 
                    { 
                        Result.Add( TargetNTAccounts[SourceNTAccountsCount++] );
                    } 
                    else
                    {
                        //
                        // Rare case that we have defined a type of identity reference and 
                        // not included it in the code logic above (this is more like a bug in the implementation
                        // but only as long as we do not allow IdentityReference to be subclassed outside of the BCL) 
                        // 
                        BCLDebug.Assert( false, "Source type is an IdentityReference type which has not been included in translation logic.");
                        throw new SystemException(); 
                    }
                }
            }
 
            return Result;
        } 
 
        #endregion
    } 

    [System.Runtime.InteropServices.ComVisible(false)]
    internal class IdentityReferenceEnumerator : IEnumerator
    { 
        #region Private members
 
        // 
        // Current enumeration index
        // 

        private int _Current;

        // 
        // Parent collection
        // 
 
        private readonly IdentityReferenceCollection _Collection;
 
        #endregion

        #region Constructors
 
        internal IdentityReferenceEnumerator( IdentityReferenceCollection collection )
        { 
            if ( collection == null ) 
            {
                throw new ArgumentNullException( "collection" ); 
            }

            _Collection = collection;
            _Current = -1; 
        }
 
        #endregion 

        #region IEnumerator implementation 

        /// 
        object IEnumerator.Current
        { 
            get { return _Collection.Identities[_Current]; }
        } 
 
        public IdentityReference Current
        { 
            get { return (( IEnumerator )this).Current as IdentityReference; }
        }

        public bool MoveNext() 
        {
            _Current++; 
 
            return ( _Current < _Collection.Count );
        } 

        public void Reset()
        {
            _Current = -1; 
        }
 
	 void IDisposable.Dispose() 
        {
            Dispose(); 
        }

        protected void Dispose() {}
 
        #endregion
    } 
}

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