Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Data / Microsoft / SqlServer / Server / SmiMetaDataProperty.cs / 1 / SmiMetaDataProperty.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //[....] //----------------------------------------------------------------------------- namespace Microsoft.SqlServer.Server { using System; using System.Collections.Generic; using System.Data; using System.Data.Common; using System.Data.SqlClient; using System.Diagnostics; using System.Globalization; // SmiMetaDataProperty defines an extended, optional property to be used on the SmiMetaData class // This approach to adding properties is added combat the growing number of sparsely-used properties // that are specially handled on the base classes internal enum SmiPropertySelector { DefaultFields = 0x0, SortOrder = 0x1, UniqueKey = 0x2, } // Simple collection for properties. Could extend to IDictionary support if needed in future. internal class SmiMetaDataPropertyCollection { private const int SelectorCount = 3; // number of elements in SmiPropertySelector private SmiMetaDataProperty[] _properties; private bool _isReadOnly; internal static readonly SmiMetaDataPropertyCollection EmptyInstance; // Singleton empty instances to ensure each property is always non-null private static readonly SmiDefaultFieldsProperty __emptyDefaultFields = new SmiDefaultFieldsProperty(new List()); private static readonly SmiOrderProperty __emptySortOrder = new SmiOrderProperty(new List ()); private static readonly SmiUniqueKeyProperty __emptyUniqueKey = new SmiUniqueKeyProperty(new List ()); static SmiMetaDataPropertyCollection() { EmptyInstance = new SmiMetaDataPropertyCollection(); EmptyInstance.SetReadOnly(); } internal SmiMetaDataPropertyCollection() { _properties = new SmiMetaDataProperty[SelectorCount]; _isReadOnly = false; _properties[(int)SmiPropertySelector.DefaultFields] = __emptyDefaultFields; _properties[(int)SmiPropertySelector.SortOrder] = __emptySortOrder; _properties[(int)SmiPropertySelector.UniqueKey] = __emptyUniqueKey; } internal SmiMetaDataProperty this[SmiPropertySelector key] { get { return _properties[(int)key]; } set { if (null == value) { throw ADP.InternalError(ADP.InternalErrorCode.InvalidSmiCall); } EnsureWritable(); _properties[(int)key] = value; } } internal bool IsReadOnly { get { return _isReadOnly; } } internal IEnumerable Values { get { return new List (_properties); } } // Allow switching to read only, but not back. internal void SetReadOnly() { _isReadOnly = true; } private void EnsureWritable() { if (IsReadOnly) { throw System.Data.Common.ADP.InternalError(System.Data.Common.ADP.InternalErrorCode.InvalidSmiCall); } } } // Base class for properties internal abstract class SmiMetaDataProperty { internal abstract string TraceString(); } // Property defining a list of column ordinals that define a unique key internal class SmiUniqueKeyProperty : SmiMetaDataProperty { private IList _columns; internal SmiUniqueKeyProperty(IList columnIsKey) { _columns = new List (columnIsKey).AsReadOnly(); } // indexed by column ordinal indicating for each column whether it is key or not internal bool this[int ordinal] { get { if (_columns.Count <= ordinal) { return false; } else { return _columns[ordinal]; } } } [Conditional("DEBUG")] internal void CheckCount(int countToMatch) { Debug.Assert(0 == _columns.Count || countToMatch == _columns.Count, "SmiDefaultFieldsProperty.CheckCount: DefaultFieldsProperty size (" + _columns.Count + ") not equal to checked size (" + countToMatch + ")" ); } internal override string TraceString() { string returnValue = "UniqueKey("; bool delimit = false; for (int columnOrd = 0; columnOrd < _columns.Count; columnOrd++) { if (delimit) { returnValue += ","; } else { delimit = true; } if (_columns[columnOrd]) { returnValue += columnOrd.ToString(CultureInfo.InvariantCulture); } } returnValue += ")"; return returnValue; } } // Property defining a sort order for a set of columns (by ordinal and ASC/DESC). internal class SmiOrderProperty : SmiMetaDataProperty { internal struct SmiColumnOrder { internal int SortOrdinal; internal SortOrder Order; internal string TraceString() { return String.Format(CultureInfo.InvariantCulture, "{0} {1}", SortOrdinal, Order); } } private IList _columns; internal SmiOrderProperty(IList columnOrders) { _columns = new List (columnOrders).AsReadOnly(); } // Readonly list of the columnorder instances making up the sort order // order in list indicates precedence internal SmiColumnOrder this[int ordinal] { get { if (_columns.Count <= ordinal) { SmiColumnOrder order = new SmiColumnOrder(); order.Order = SortOrder.Unspecified; order.SortOrdinal = -1; return order; } else { return _columns[ordinal]; } } } [Conditional("DEBUG")] internal void CheckCount(int countToMatch) { Debug.Assert(0 == _columns.Count || countToMatch == _columns.Count, "SmiDefaultFieldsProperty.CheckCount: DefaultFieldsProperty size (" + _columns.Count + ") not equal to checked size (" + countToMatch + ")" ); } internal override string TraceString() { string returnValue = "SortOrder("; bool delimit = false; foreach(SmiColumnOrder columnOrd in _columns) { if (delimit) { returnValue += ","; } else { delimit = true; } if (System.Data.SqlClient.SortOrder.Unspecified != columnOrd.Order) { returnValue += columnOrd.TraceString(); } } returnValue += ")"; return returnValue; } } // property defining inheritance relationship(s) internal class SmiDefaultFieldsProperty : SmiMetaDataProperty { #region private fields private IList _defaults; #endregion #region internal interface internal SmiDefaultFieldsProperty(IList defaultFields) { _defaults = new List (defaultFields).AsReadOnly(); } internal bool this[int ordinal] { get { if (_defaults.Count <= ordinal) { return false; } else { return _defaults[ordinal]; } } } [Conditional("DEBUG")] internal void CheckCount(int countToMatch) { Debug.Assert(0 == _defaults.Count || countToMatch == _defaults.Count, "SmiDefaultFieldsProperty.CheckCount: DefaultFieldsProperty size (" + _defaults.Count + ") not equal to checked size (" + countToMatch + ")" ); } internal override string TraceString() { string returnValue = "DefaultFields("; bool delimit = false; for(int columnOrd = 0; columnOrd < _defaults.Count; columnOrd++) { if (delimit) { returnValue += ","; } else { delimit = true; } if (_defaults[columnOrd]) { returnValue += columnOrd; } } returnValue += ")"; return returnValue; } #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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