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/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Metadata / Edm / MetadataProperty.cs / 1305376 / MetadataProperty.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] // @backupOwner [....] //--------------------------------------------------------------------- using System; using System.Collections.Generic; using System.Data.Common; using System.Diagnostics; using System.Reflection; namespace System.Data.Metadata.Edm { ////// Class representing a metadata attribute for an item /// public sealed class MetadataProperty : MetadataItem { #region Constructors ////// The constructor for MetadataProperty taking in a name, a TypeUsage object, and a value for the attribute /// /// The name of this MetadataProperty /// The TypeUsage describing the type of this MetadataProperty /// The value for this attribute ///Thrown if typeUsage argument is null internal MetadataProperty(string name, TypeUsage typeUsage, object value) { EntityUtil.GenericCheckArgumentNull(typeUsage, "typeUsage"); _name = name; _value = value; _typeUsage = typeUsage; _propertyKind = PropertyKind.Extended; } ////// The constructor for MetadataProperty taking in all the ingredients for creating TypeUsage and the actual value /// /// The name of the attribute /// The edm type of the attribute /// Whether the collection type of the given edm type should be used /// The value of the attribute internal MetadataProperty(string name, EdmType edmType, bool isCollectionType, object value) { EntityUtil.CheckArgumentNull(edmType, "edmType"); _name = name; _value = value; if (isCollectionType) { _typeUsage = TypeUsage.Create(edmType.GetCollectionType()); } else { _typeUsage = TypeUsage.Create(edmType); } _propertyKind = PropertyKind.System; } #endregion #region Fields private string _name; private PropertyKind _propertyKind; private object _value; private TypeUsage _typeUsage; #endregion #region Properties ////// Returns the kind of the type /// public override BuiltInTypeKind BuiltInTypeKind { get { return BuiltInTypeKind.MetadataProperty; } } ////// Gets the identity of this item /// internal override string Identity { get { return Name; } } ////// Gets/Sets the name of this MetadataProperty /// [MetadataProperty(PrimitiveTypeKind.String, false)] public string Name { get { // The name is immutable, so it should be safe to always get it from the field return _name; } } ////// Gets/Sets the value of this MetadataProperty /// ///Thrown if the MetadataProperty instance is in readonly state [MetadataProperty(typeof(Object), false)] public object Value { get { // Check if we're redirecting to an MetadataItem system property MetadataPropertyValue redirectValue = _value as MetadataPropertyValue; if (null != redirectValue) { return redirectValue.GetValue(); } // If not, return the actual stored value return _value; } } ////// Gets/Sets the TypeUsage object describing the type of this attribute /// ///Thrown if value passed into setter is null ///Thrown if the MetadataProperty instance is in readonly state [MetadataProperty(BuiltInTypeKind.TypeUsage, false)] public TypeUsage TypeUsage { get { return _typeUsage; } } #endregion #region Methods ////// Sets this item to be readonly, once this is set, the item will never be writable again. /// internal override void SetReadOnly() { if (!IsReadOnly) { base.SetReadOnly(); // TypeUsage is always readonly, no need to set _typeUsage } } ////// Returns the kind of the attribute /// public PropertyKind PropertyKind { get { return _propertyKind; } } #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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