EntitySetBase.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Metadata / Edm / EntitySetBase.cs / 1305376 / EntitySetBase.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.Text; 

namespace System.Data.Metadata.Edm 
{ 
    /// 
    /// Class for representing a entity set 
    /// 
    public abstract class EntitySetBase : MetadataItem
    {
        //--------------------------------------------------------------------------------------------- 
        // Possible Future Enhancement: revisit factoring of EntitySetBase and delta between C constructs and S constructs
        // 
        // Currently, we need to have a way to map an entityset or a relationship set in S space 
        // to the appropriate structures in the store. In order to address this we said we would
        // add new ItemAttributes (tableName, schemaName and catalogName to the EntitySetBase)... 
        // problem with this is that we are bleading a leaf-level, store specific set of constructs
        // into the object model for things that may exist at either C or S.
        //
        // We need to do this for now to push forward on enabling the conversion but we need to re-examine 
        // whether we should have separate C and S space constructs or some other mechanism for
        // maintaining this metadata. 
        //--------------------------------------------------------------------------------------------- 

        #region Constructors 
        /// 
        /// The constructor for constructing the EntitySet with a given name and an entity type
        /// 
        /// The name of the EntitySet 
        /// The db schema
        /// The db table 
        /// The provider specific query that should be used to retrieve the EntitySet 
        /// The entity type of the entities that this entity set type contains
        /// Thrown if the name or entityType argument is null 
        internal EntitySetBase(string name, string schema, string table, string definingQuery, EntityTypeBase entityType)
        {
            EntityUtil.GenericCheckArgumentNull(entityType, "entityType");
            EntityUtil.CheckStringArgument(name, "name"); 
            // SQLBU 480236: catalogName, schemaName & tableName are allowed to be null, empty & non-empty
 
            _name = name; 

            //---- name of the 'schema' 
            //---- this is used by the SQL Gen utility to support generation of the correct name in the store
            _schema = schema;

            //---- name of the 'table' 
            //---- this is used by the SQL Gen utility to support generation of the correct name in the store
            _table = table; 
 
            //---- the Provider specific query to use to retrieve the EntitySet data
            _definingQuery = definingQuery; 

            this.ElementType = entityType;
        }
        #endregion 

        #region Fields 
        private EntityContainer _entityContainer; 
        private string _name;
        private EntityTypeBase _elementType; 
        private string _table;
        private string _schema;
        private string _definingQuery;
        private string _cachedProviderSql; 

        #endregion 
 
        #region Properties
        ///  
        /// Returns the kind of the type
        /// 
        public override BuiltInTypeKind BuiltInTypeKind { get { return BuiltInTypeKind.EntitySetBase; } }
 

        ///  
        /// Gets the identity for this item as a string 
        /// 
        internal override string Identity 
        {
            get
            {
                return this.Name; 
            }
        } 
 
        /// 
        /// Gets or sets escaped SQL describing this entity set. 
        /// 
        [MetadataProperty(PrimitiveTypeKind.String, false)]
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")] // referenced by System.Data.Entity.Design.dll
        internal string DefiningQuery 
        {
            get { return _definingQuery; } 
            set { _definingQuery = value; } 
        }
 
        /// 
        /// Get and set by the provider only as a convientent place to
        /// store the created sql fragment that represetnts this entity set
        ///  
        internal string CachedProviderSql
        { 
            get { return _cachedProviderSql; } 
            set { _cachedProviderSql = value; }
        } 

        /// 
        /// Gets/Sets the name of this entity set
        ///  
        /// Thrown if value passed into setter is null
        /// Thrown if the setter is called when EntitySetBase instance is in ReadOnly state 
        [MetadataProperty(PrimitiveTypeKind.String, false)] 
        public String Name
        { 
            get
            {
                return _name;
            } 
        }
 
        ///  
        /// Returns the entity container of the entity set
        ///  
        /// Thrown if value passed into setter is null
        /// Thrown if the setter is called when the EntitySetBase instance or the EntityContainer passed into the setter is in ReadOnly state
        public EntityContainer EntityContainer
        { 
            get
            { 
                return _entityContainer; 
            }
        } 

        /// 
        /// Gets/Sets the entity type of this entity set
        ///  
        /// if value passed into setter is null
        /// Thrown if the setter is called when EntitySetBase instance is in ReadOnly state 
        [MetadataProperty(BuiltInTypeKind.EntityTypeBase, false)] 
        public EntityTypeBase ElementType
        { 
            get
            {
                return _elementType;
            } 
            internal set
            { 
                EntityUtil.GenericCheckArgumentNull(value, "value"); 
                Util.ThrowIfReadOnly(this);
                _elementType = value; 
            }
        }

        [MetadataProperty(PrimitiveTypeKind.String, false)] 
        internal string Table
        { 
            get 
            {
                return _table; 
            }
        }

        [MetadataProperty(PrimitiveTypeKind.String, false)] 
        internal string Schema
        { 
            get 
            {
                return _schema; 
            }
        }
        #endregion
 
        #region Methods
        ///  
        /// Overriding System.Object.ToString to provide better String representation 
        /// for this type.
        ///  
        public override string ToString()
        {
            return Name;
        } 

        ///  
        /// Sets this item to be readonly, once this is set, the item will never be writable again. 
        /// 
        internal override void SetReadOnly() 
        {
            if (!this.IsReadOnly)
            {
                base.SetReadOnly(); 

                EntityTypeBase elementType = ElementType; 
                if (elementType != null) 
                {
                    elementType.SetReadOnly(); 
                }
            }
        }
 
        /// 
        /// Change the entity container without doing fixup in the entity set collection 
        ///  
        internal void ChangeEntityContainerWithoutCollectionFixup(EntityContainer newEntityContainer)
        { 
            _entityContainer = newEntityContainer;
        }
        #endregion
    } 
}

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

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