ObjectStateEntryDbDataRecord.cs source code in C# .NET

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

using System; 
using System.Data;
using System.Data.Common;
using System.ComponentModel;
using System.Data.Metadata.Edm; 
using System.Diagnostics;
 
namespace System.Data.Objects 
{
 
    internal sealed class ObjectStateEntryDbDataRecord : DbDataRecord, IExtendedDataRecord
    {
        private readonly StateManagerTypeMetadata _metadata;
        private readonly ObjectStateEntry _cacheEntry; 
        private readonly object _userObject;
        private DataRecordInfo _recordInfo; 
 
        internal ObjectStateEntryDbDataRecord(EntityEntry cacheEntry, StateManagerTypeMetadata metadata, object userObject)
        { 
            EntityUtil.CheckArgumentNull(cacheEntry, "cacheEntry");
            EntityUtil.CheckArgumentNull(userObject, "userObject");
            EntityUtil.CheckArgumentNull(metadata, "metadata");
            Debug.Assert(!cacheEntry.IsKeyEntry, "Cannot create an ObjectStateEntryDbDataRecord for a key entry"); 
            switch (cacheEntry.State)
            { 
                case EntityState.Unchanged: 
                case EntityState.Modified:
                case EntityState.Deleted: 
                    _cacheEntry = cacheEntry;
                    _userObject = userObject;
                    _metadata = metadata;
                    break; 
                default:
                    Debug.Assert(false, "A DbDataRecord cannot be created for an entity object that is in an added or detached state."); 
                    break; 
            }
        } 
        internal ObjectStateEntryDbDataRecord(RelationshipEntry cacheEntry)
        {
            EntityUtil.CheckArgumentNull(cacheEntry, "cacheEntry");
            Debug.Assert(!cacheEntry.IsKeyEntry, "Cannot create an ObjectStateEntryDbDataRecord for a key entry"); 
            switch (cacheEntry.State)
            { 
                case EntityState.Unchanged: 
                case EntityState.Modified:
                case EntityState.Deleted: 
                    _cacheEntry = cacheEntry;
                    break;
                default:
                    Debug.Assert(false, "A DbDataRecord cannot be created for an entity object that is in an added or detached state."); 
                    break;
            } 
        } 
        override public int FieldCount
        { 
            get
            {
                Debug.Assert(_cacheEntry != null, "CacheEntry is required.");
                return _cacheEntry.GetFieldCount(_metadata); 
            }
        } 
        override public object this[int ordinal] 
        {
            get 
            {
                return GetValue(ordinal);
            }
        } 
        override public object this[string name]
        { 
            get 
            {
                return GetValue(GetOrdinal(name)); 
            }
        }
        override public bool GetBoolean(int ordinal)
        { 
            return (bool)GetValue(ordinal);
        } 
        override public byte GetByte(int ordinal) 
        {
            return (byte)GetValue(ordinal); 
        }
        override public long GetBytes(int ordinal, long dataIndex, byte[] buffer, int bufferIndex, int length)
        {
            byte[] tempBuffer; 
            tempBuffer = (byte[])GetValue(ordinal);
 
            if (buffer == null) 
            {
                return tempBuffer.Length; 
            }
            int srcIndex = (int)dataIndex;
            int byteCount = Math.Min(tempBuffer.Length - srcIndex, length);
            if (srcIndex < 0) 
            {
                throw EntityUtil.InvalidSourceBufferIndex(tempBuffer.Length, srcIndex, "dataIndex"); 
            } 
            else if ((bufferIndex < 0) || (bufferIndex > 0 && bufferIndex >= buffer.Length))
            { 
                throw EntityUtil.InvalidDestinationBufferIndex(buffer.Length, bufferIndex, "bufferIndex");
            }

            if (0 < byteCount) 
            {
                Array.Copy(tempBuffer, dataIndex, buffer, bufferIndex, byteCount); 
            } 
            else if (length < 0)
            { 
                throw EntityUtil.InvalidDataLength(length);
            }
            else
            { 
                byteCount = 0;
            } 
            return byteCount; 
        }
        override public char GetChar(int ordinal) 
        {
            return (char)GetValue(ordinal);
        }
        override public long GetChars(int ordinal, long dataIndex, char[] buffer, int bufferIndex, int length) 
        {
            char[] tempBuffer; 
            tempBuffer = (char[])GetValue(ordinal); 

            if (buffer == null) 
            {
                return tempBuffer.Length;
            }
 
            int srcIndex = (int)dataIndex;
            int charCount = Math.Min(tempBuffer.Length - srcIndex, length); 
            if (srcIndex < 0) 
            {
                throw EntityUtil.InvalidSourceBufferIndex(buffer.Length, bufferIndex, "bufferIndex"); 
            }
            else if ((bufferIndex < 0) || (bufferIndex > 0 && bufferIndex >= buffer.Length))
            {
                throw EntityUtil.InvalidDestinationBufferIndex(buffer.Length, bufferIndex, "bufferIndex"); 
            }
 
            if (0 < charCount) 
            {
                Array.Copy(tempBuffer, dataIndex, buffer, bufferIndex, charCount); 
            }
            else if (length < 0)
            {
                throw EntityUtil.InvalidDataLength(length); 
            }
            else 
            { 
                charCount = 0;
            } 
            return charCount;
        }
        override protected DbDataReader GetDbDataReader(int ordinal)
        { 
            throw EntityUtil.NotSupported();
        } 
        override public string GetDataTypeName(int ordinal) 
        {
            return (GetFieldType(ordinal)).Name; 
        }
        override public DateTime GetDateTime(int ordinal)
        {
            return (DateTime)GetValue(ordinal); 
        }
        override public Decimal GetDecimal(int ordinal) 
        { 
            return (Decimal)GetValue(ordinal);
        } 
        override public double GetDouble(int ordinal)
        {
            return (Double)GetValue(ordinal);
        } 
        public override Type GetFieldType(int ordinal)
        { 
            return _cacheEntry.GetFieldType(ordinal, _metadata); 
        }
        override public float GetFloat(int ordinal) 
        {
            return (float)GetValue(ordinal);
        }
        override public Guid GetGuid(int ordinal) 
        {
            return (Guid)GetValue(ordinal); 
        } 
        override public Int16 GetInt16(int ordinal)
        { 
            return (Int16)GetValue(ordinal);
        }
        override public Int32 GetInt32(int ordinal)
        { 
            return (Int32)GetValue(ordinal);
        } 
        override public Int64 GetInt64(int ordinal) 
        {
            return (Int64)GetValue(ordinal); 
        }
        override public string GetName(int ordinal)
        {
            return _cacheEntry.GetCLayerName(ordinal, _metadata); 
        }
        override public int GetOrdinal(string name) 
        { 
            int ordinal = _cacheEntry.GetOrdinalforCLayerName(name, _metadata);
            if (ordinal == -1) 
            {
                throw EntityUtil.ArgumentOutOfRange("name");
            }
            return  ordinal; 
        }
        override public string GetString(int ordinal) 
        { 
            return (string)GetValue(ordinal);
        } 
        override public object GetValue(int ordinal)
        {
            if (_cacheEntry.IsRelationship)
            { 
                return (_cacheEntry as RelationshipEntry).GetOriginalRelationValue(ordinal);
            } 
            else 
            {
                return (_cacheEntry as EntityEntry).GetOriginalEntityValue(_metadata, ordinal, _userObject, ObjectStateValueRecord.OriginalReadonly); 
            }
        }
        override public int GetValues(object[] values)
        { 
            if (values == null)
            { 
                throw EntityUtil.ArgumentNull("values"); 
            }
            int minValue = Math.Min(values.Length, FieldCount); 
            for (int i = 0; i < minValue; i++)
            {
                values[i] = GetValue(i);
            } 
            return minValue;
        } 
        override public bool IsDBNull(int ordinal) 
        {
            return (GetValue(ordinal) == DBNull.Value); 
        }

        public DataRecordInfo DataRecordInfo
        { 
            get
            { 
                if (null == _recordInfo) 
                {
                    Debug.Assert(_cacheEntry != null, "CacheEntry is required."); 
                    _recordInfo = _cacheEntry.GetDataRecordInfo(_metadata, _userObject);
                }
                return _recordInfo;
            } 
        }
        public DbDataRecord GetDataRecord(int ordinal) 
        { 
            return (DbDataRecord)GetValue(ordinal);
        } 
        public DbDataReader GetDataReader(int i)
        {
            return this.GetDbDataReader(i);
        } 
    }
} 

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

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