ObjectStateEntryBaseUpdatableDataRecord.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Objects / ObjectStateEntryBaseUpdatableDataRecord.cs / 1305376 / ObjectStateEntryBaseUpdatableDataRecord.cs
                        
                        
                            //---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner       [....]
// @backupOwner [....] 
//--------------------------------------------------------------------- 
using System;
using System.ComponentModel; 
using System.Data;
using System.Data.Common;
using System.Data.Metadata.Edm;
using System.Diagnostics; 
using System.Reflection;
 
namespace System.Data.Objects 
{
    ///  
    ///
    /// 
    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "Db")]
    public abstract class DbUpdatableDataRecord : DbDataRecord, IExtendedDataRecord 
    {
        internal readonly StateManagerTypeMetadata _metadata; 
        internal readonly ObjectStateEntry _cacheEntry; 
        internal readonly object _userObject;
        internal DataRecordInfo _recordInfo; 

        internal DbUpdatableDataRecord(ObjectStateEntry cacheEntry, StateManagerTypeMetadata metadata, object userObject)
        {
            _cacheEntry = cacheEntry; 
            _userObject = userObject;
            _metadata = metadata; 
        } 

        internal DbUpdatableDataRecord(ObjectStateEntry cacheEntry) : 
            this(cacheEntry, null, null)
        {
        }
 
        /// 
        /// Returns the number of fields in the record. 
        ///  
        override public int FieldCount
        { 
            get
            {
                Debug.Assert(_cacheEntry != null, "CacheEntry is required.");
                return _cacheEntry.GetFieldCount(_metadata); 
            }
        } 
 
        /// 
        /// Retrieves a value with the given field ordinal 
        /// 
        /// The ordinal of the field
        /// The field value
        override public object this[int ordinal] 
        {
            get 
            { 
                return GetValue(ordinal);
            } 
        }

        /// 
        /// Retrieves a value with the given field name 
        /// 
        /// The name of the field 
        /// The field value 
        override public object this[string name]
        { 
            get
            {
                return GetValue(GetOrdinal(name));
            } 
        }
 
        ///  
        /// Retrieves the field value as a boolean
        ///  
        /// The ordinal of the field
        /// The field value as a boolean
        override public bool GetBoolean(int ordinal)
        { 
            return (bool)GetValue(ordinal);
        } 
 
        /// 
        /// Retrieves the field value as a byte 
        /// 
        /// The ordinal of the field
        /// The field value as a byte
        override public byte GetByte(int ordinal) 
        {
            return (byte)GetValue(ordinal); 
        } 

        ///  
        /// Retrieves the field value as a byte array
        /// 
        /// The ordinal of the field
        /// The index at which to start copying data 
        /// The destination buffer where data is copied to
        /// The index in the destination buffer where copying will begin 
        /// The number of bytes to copy 
        /// The number of bytes copied
        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;
        } 
 
        /// 
        /// Retrieves the field value as a char 
        /// 
        /// The ordinal of the field
        /// The field value as a char
        override public char GetChar(int ordinal) 
        {
            return (char)GetValue(ordinal); 
        } 

        ///  
        /// Retrieves the field value as a char array
        /// 
        /// The ordinal of the field
        /// The index at which to start copying data 
        /// The destination buffer where data is copied to
        /// The index in the destination buffer where copying will begin 
        /// The number of chars to copy 
        /// The number of chars copied
        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(tempBuffer.Length, srcIndex, "dataIndex");
            } 
            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; 
        } 
        IDataReader IDataRecord.GetData(int ordinal)
        { 
            return GetDbDataReader(ordinal);
        }

        ///  
        /// Retrieves the field value as a DbDataReader
        ///  
        /// The ordinal of the field 
        /// 
        override protected DbDataReader GetDbDataReader(int ordinal) 
        {
            throw EntityUtil.NotSupported();
        }
        ///  
        /// Retrieves the name of the field data type
        ///  
        /// The ordinal of the field 
        /// The name of the field data type
        override public string GetDataTypeName(int ordinal) 
        {
            return ((Type)GetFieldType(ordinal)).Name;
        }
        ///  
        /// Retrieves the field value as a DateTime
        ///  
        /// The ordinal of the field 
        /// The field value as a DateTime
        override public DateTime GetDateTime(int ordinal) 
        {
            return (DateTime)GetValue(ordinal);
        }
        ///  
        /// Retrieves the field value as a decimal
        ///  
        /// The ordinal of the field 
        /// The field value as a decimal
        override public Decimal GetDecimal(int ordinal) 
        {
            return (Decimal)GetValue(ordinal);
        }
        ///  
        /// Retrieves the field value as a double
        ///  
        /// The ordinal of the field 
        /// The field value as a double
        override public double GetDouble(int ordinal) 
        {
            return (double)GetValue(ordinal);
        }
        ///  
        /// Retrieves the type of a field
        ///  
        /// The ordinal of the field 
        /// The field type
        public override Type GetFieldType(int ordinal) 
        {
            Debug.Assert(_cacheEntry != null, "CacheEntry is required.");
            return _cacheEntry.GetFieldType(ordinal, _metadata);
        } 
        /// 
        /// Retrieves the field value as a float 
        ///  
        /// The ordinal of the field
        /// The field value as a float 
        override public float GetFloat(int ordinal)
        {
            return (float)GetValue(ordinal);
        } 
        /// 
        /// Retrieves the field value as a Guid 
        ///  
        /// The ordinal of the field
        /// The field value as a Guid 
        override public Guid GetGuid(int ordinal)
        {
            return (Guid)GetValue(ordinal);
        } 
        /// 
        /// Retrieves the field value as an Int16 
        ///  
        /// The ordinal of the field
        /// The field value as an Int16 
        override public Int16 GetInt16(int ordinal)
        {
            return (Int16)GetValue(ordinal);
        } 
        /// 
        /// Retrieves the field value as an Int32 
        ///  
        /// The ordinal of the field
        /// The field value as an Int32 
        override public Int32 GetInt32(int ordinal)
        {
            return (Int32)GetValue(ordinal);
        } 
        /// 
        /// Retrieves the field value as an Int64 
        ///  
        /// The ordinal of the field
        /// The field value as an Int64 
        override public Int64 GetInt64(int ordinal)
        {
            return (Int64)GetValue(ordinal);
        } 
        /// 
        /// Retrieves the name of a field 
        ///  
        /// The ordinal of the field
        /// The name of the field 
        override public string GetName(int ordinal)
        {
            Debug.Assert(_cacheEntry != null, "CacheEntry is required.");
            return _cacheEntry.GetCLayerName(ordinal, _metadata); 
        }
        ///  
        /// Retrieves the ordinal of a field by name 
        /// 
        /// The name of the field 
        /// The ordinal of the field
        override public int GetOrdinal(string name)
        {
            Debug.Assert(_cacheEntry != null, "CacheEntry is required."); 
            int ordinal = _cacheEntry.GetOrdinalforCLayerName(name, _metadata);
            if (ordinal == -1) 
            { 
                throw EntityUtil.ArgumentOutOfRange("name");
            } 
            return  ordinal;
        }
        /// 
        /// Retrieves the field value as a string 
        /// 
        /// The ordinal of the field 
        /// The field value as a string 
        override public string GetString(int ordinal)
        { 
            return (string)GetValue(ordinal);
        }
        /// 
        /// Retrieves the value of a field 
        /// 
        /// The ordinal of the field 
        /// The field value 
        override public object GetValue(int ordinal)
        { 
            return GetRecordValue(ordinal);
        }
        /// 
        /// In derived classes, retrieves the record value for a field 
        /// 
        /// The ordinal of the field 
        /// The field value 
        protected abstract object GetRecordValue(int ordinal);
 
        /// 
        /// Retrieves all field values in the record into an object array
        /// 
        /// An array of objects to store the field values 
        /// The number of field values returned
        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;
        } 
        /// 
        /// Determines if a field has a DBNull value
        /// 
        /// The ordinal of the field 
        /// True if the field has a DBNull value
        override public bool IsDBNull(int ordinal) 
        { 
            return (GetValue(ordinal) == DBNull.Value);
        } 
        /// 
        /// Sets the value of a field in a record
        /// 
        /// The ordinal of the field 
        /// 
        public void SetBoolean(int ordinal, bool value) 
        { 
            SetValue(ordinal, value);
        } 
        /// 
        /// Sets the value of a field in a record
        /// 
        /// The ordinal of the field 
        /// 
        public void SetByte(int ordinal, byte value) 
        { 
            SetValue(ordinal, value);
        } 
        /// 
        /// Sets the value of a field in a record
        /// 
        /// The ordinal of the field 
        /// The new field value
        public void SetChar(int ordinal, char value) 
        { 
            SetValue(ordinal, value);
        } 
        /// 
        /// Sets the value of a field in a record
        /// 
        /// The ordinal of the field 
        /// The new field value
        public void SetDataRecord(int ordinal, IDataRecord value) 
        { 
            SetValue(ordinal, value);
        } 
        /// 
        /// Sets the value of a field in a record
        /// 
        /// The ordinal of the field 
        /// The new field value
        public void SetDateTime(int ordinal, DateTime value) 
        { 
            SetValue(ordinal, value);
        } 
        /// 
        /// Sets the value of a field in a record
        /// 
        /// The ordinal of the field 
        /// The new field value
        public void SetDecimal(int ordinal, Decimal value) 
        { 
            SetValue(ordinal, value);
        } 
        /// 
        /// Sets the value of a field in a record
        /// 
        /// The ordinal of the field 
        /// The new field value
        public void SetDouble(int ordinal, Double value) 
        { 
            SetValue(ordinal, value);
        } 
        /// 
        /// Sets the value of a field in a record
        /// 
        /// The ordinal of the field 
        /// The new field value
        public void SetFloat(int ordinal, float value) 
        { 
            SetValue(ordinal, value);
        } 
        /// 
        /// Sets the value of a field in a record
        /// 
        /// The ordinal of the field 
        /// The new field value
        public void SetGuid(int ordinal, Guid value) 
        { 
            SetValue(ordinal, value);
        } 
        /// 
        /// Sets the value of a field in a record
        /// 
        /// The ordinal of the field 
        /// The new field value
        public void SetInt16(int ordinal, Int16 value) 
        { 
            SetValue(ordinal, value);
        } 
        /// 
        /// Sets the value of a field in a record
        /// 
        /// The ordinal of the field 
        /// The new field value
        public void SetInt32(int ordinal, Int32 value) 
        { 
            SetValue(ordinal, value);
        } 
        /// 
        /// Sets the value of a field in a record
        /// 
        /// The ordinal of the field 
        /// The new field value
        public void SetInt64(int ordinal, Int64 value) 
        { 
            SetValue(ordinal, value);
        } 
        /// 
        /// Sets the value of a field in a record
        /// 
        /// The ordinal of the field 
        /// The new field value
        public void SetString(int ordinal, string value) 
        { 
            SetValue(ordinal, value);
        } 
        /// 
        /// Sets the value of a field in a record
        /// 
        /// The ordinal of the field 
        /// The new field value
        public void SetValue(int ordinal, object value) 
        { 
            SetRecordValue(ordinal, value);
        } 
        /// 
        /// Sets field values in a record
        /// 
        ///  
        /// The number of fields that were set
        public int SetValues(params Object[] values) 
        { 
            int minValue = Math.Min(values.Length, FieldCount);
            for (int i = 0; i < minValue; i++) 
            {
                SetRecordValue(i, values[i]);
            }
            return minValue; 
        }
        ///  
        /// Sets a field to the DBNull value 
        /// 
        /// The ordinal of the field 
        public void SetDBNull(int ordinal)
        {
            SetRecordValue(ordinal, DBNull.Value);
        } 
        /// 
        /// Retrieve data record information 
        ///  
        public virtual DataRecordInfo DataRecordInfo
        { 
            get
            {
                if (null == _recordInfo)
                { 
                    Debug.Assert(_cacheEntry != null, "CacheEntry is required.");
                    _recordInfo = _cacheEntry.GetDataRecordInfo(_metadata, _userObject); 
                } 
                return _recordInfo;
            } 
        }
        /// 
        /// Retrieves a field value as a DbDataRecord
        ///  
        /// The ordinal of the field
        /// The field value as a DbDataRecord 
        public DbDataRecord GetDataRecord(int ordinal) 
        {
            return (DbDataRecord)GetValue(ordinal); 
        }

        /// 
        /// Used to return a nested result 
        /// 
        ///  
        ///  
        public DbDataReader GetDataReader(int i)
        { 
            return this.GetDbDataReader(i);
        }

        ///  
        /// Sets the field value for a given ordinal
        ///  
        /// in the cspace mapping 
        /// in CSpace
        protected abstract void SetRecordValue(int ordinal, object value); 
    }

    public abstract class CurrentValueRecord : DbUpdatableDataRecord
    { 
        internal CurrentValueRecord(ObjectStateEntry cacheEntry, StateManagerTypeMetadata metadata, object userObject) :
            base(cacheEntry, metadata, userObject) 
        { 
        }
 
        internal CurrentValueRecord(ObjectStateEntry cacheEntry) :
            base(cacheEntry)
        {
        } 
    }
 
    public abstract class OriginalValueRecord : DbUpdatableDataRecord 
    {
        internal OriginalValueRecord(ObjectStateEntry cacheEntry, StateManagerTypeMetadata metadata, object userObject) : 
            base(cacheEntry, metadata, userObject)
        {
        }
    } 
}

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

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