FilteredSchemaElementLookUpTable.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 / FilteredSchemaElementLookUpTable.cs / 1305376 / FilteredSchemaElementLookUpTable.cs
                        

                        
                            //---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner       [....]
// @backupOwner [....] 
//--------------------------------------------------------------------- 

using System; 
using System.Collections;
using System.Collections.Generic;
using System.Data;
 
namespace System.Data.EntityModel.SchemaObjectModel
{ 
    /// 
 
    /// Summary description for FilteredSchemaTypes.
    /// 
 
    internal sealed class FilteredSchemaElementLookUpTable : IEnumerable, ISchemaElementLookUpTable
    where T : S
    where S : SchemaElement
    { 
        #region Instance Fields
        private SchemaElementLookUpTable _lookUpTable = null; 
        #endregion 

        #region Public Methods 
        /// 

        ///
        /// 
        ///  
        public FilteredSchemaElementLookUpTable(SchemaElementLookUpTable lookUpTable)
        { 
            _lookUpTable = lookUpTable; 
        }
 
        /// 

        ///
        /// 
        ///  
        public IEnumerator GetEnumerator()
        { 
            return _lookUpTable.GetFilteredEnumerator(); 
        }
 
        /// 

        ///
        /// 
        ///  
        IEnumerator System.Collections.IEnumerable.GetEnumerator()
        { 
            return  _lookUpTable.GetFilteredEnumerator(); 
        }
 
        /// 

        ///
        /// 
        public int Count 
        {
            get 
            { 
                int count = 0;
                foreach ( SchemaElement element  in _lookUpTable ) 
                {
                    if ( element is T )
                    {
                        ++count; 
                    }
                } 
                return count; 
            }
        } 
        /// 

        ///
        /// 
        ///  
        /// 
        public bool ContainsKey(string key) 
        { 
            if ( !_lookUpTable.ContainsKey(key) )
                return false; 
            return _lookUpTable[key] as T != null;
        }
        /// 

        /// 
        /// 
        public T this[string key] 
        { 
            get
            { 
                S element = _lookUpTable[key];
                if ( element == null )
                {
                    return null; 
                }
                T elementAsT = element as T; 
                if ( elementAsT != null ) 
                {
                    return elementAsT; 
                }
                throw EntityUtil.InvalidOperation(System.Data.Entity.Strings.UnexpectedTypeInCollection(element.GetType(),key));
            }
        } 

        /// 
 
        /// 
        /// 
        ///  
        /// 
        public T LookUpEquivalentKey(string key)
        {
            return _lookUpTable.LookUpEquivalentKey(key) as T; 
        }
 
     #endregion 
    }
} 

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