TdsRecordBufferSetter.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Data / System / Data / SqlClient / TdsRecordBufferSetter.cs / 1305376 / TdsRecordBufferSetter.cs
                        

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

namespace System.Data.SqlClient { 

    using Microsoft.SqlServer.Server;
    using System;
    using System.Data; 
    using System.Data.SqlClient;
    using System.Diagnostics; 
    using System.Data.SqlTypes; 

 

    // TdsRecordBufferSetter handles writing a structured value out to a TDS stream
    internal class TdsRecordBufferSetter : SmiRecordBuffer {
        #region Fields (private) 

        private TdsValueSetter[]        _fieldSetters;      // setters for individual fields 
 
        private TdsParserStateObject    _stateObj;          // target to write to
        private SmiMetaData             _metaData;          // metadata describing value 
#if DEBUG
        private const int               ReadyForToken = -1;         // must call new/end element next
        private const int               EndElementsCalled = -2;     // already called EndElements, can only call Close
        private const int               Closed = -3;                // closed (zombied) 

        private int                     _currentField;      // validate that caller sets columns in correct order. 
#endif 

        #endregion 

        #region Exposed Construct and control methods/properties

        internal TdsRecordBufferSetter(TdsParserStateObject stateObj, SmiMetaData md) { 
            Debug.Assert(SqlDbType.Structured == md.SqlDbType, "Unsupported SqlDbType: " + md.SqlDbType);
            _fieldSetters = new TdsValueSetter[md.FieldMetaData.Count]; 
            for(int i=0; i _currentField, "_currentField out of range for setting a column:" + _currentField);
            Debug.Assert(ordinal == _currentField, "Setter called out of order.  Should be " + _currentField + ", but was " + ordinal); 
            // Must not write to field with a DefaultFieldsProperty set to true
            Debug.Assert(!((SmiDefaultFieldsProperty)_metaData.ExtendedProperties[SmiPropertySelector.DefaultFields])[ordinal],
                "Attempt to write to a default-valued field: " + ordinal);
#endif 
        }
 
        // Handle logic of skipping default columns 
        [Conditional("DEBUG")]
        private void SkipPossibleDefaultedColumns(int targetColumn) { 
#if DEBUG
            Debug.Assert(targetColumn < _metaData.FieldMetaData.Count && targetColumn >= ReadyForToken, "TdsRecordBufferSetter.SkipPossibleDefaultedColumns: Invalid target column: " + targetColumn);

            // special setup for ReadyForToken as the target 
            if (targetColumn == ReadyForToken) {
                if (ReadyForToken == _currentField) { 
                    return; 
                }
 
                // Handle readyfortoken by using count of columns in the loop.
                targetColumn = _metaData.FieldMetaData.Count;
            }
 
            // Handle skipping default-valued fields
            while (targetColumn > _currentField) { 
                // All intermediate fields must be default fields (i.e. have a "true" entry in SmiDefaultFieldsProperty 
                Debug.Assert(((SmiDefaultFieldsProperty)_metaData.ExtendedProperties[SmiPropertySelector.DefaultFields])[_currentField],
                    "Skipping a field that was not default: " + _currentField); 
                _currentField++;
            }

            if (_metaData.FieldMetaData.Count == _currentField) { 
                _currentField = ReadyForToken;
            } 
#endif 
        }
 
        [Conditional("DEBUG")]
        internal void CheckSettingColumn(int ordinal) {
#if DEBUG
            // Make sure target column can be written to. 
            CheckWritingToColumn(ordinal);
 
            _currentField++; 
            if (_metaData.FieldMetaData.Count == _currentField) {
                _currentField = ReadyForToken; 
            }
#endif
        }
 
        #endregion
    } 
} 

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

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