MetadataItem.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 / DataEntity / System / Data / Metadata / Edm / MetadataItem.cs / 1305376 / MetadataItem.cs
                        

                        
                            //---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner       [....]
// @backupOwner [....] 
//--------------------------------------------------------------------- 
using System;
using System.Collections.Generic; 
using System.Collections.ObjectModel;
using System.Diagnostics;
using System.Text;
using System.Xml.Serialization; 
using System.Xml.Schema;
using System.Xml; 
using System.Globalization; 

namespace System.Data.Metadata.Edm 
{
    /// 
    /// Represents the base item class for all the metadata
    ///  
    public abstract partial class MetadataItem
    { 
        #region Constructors 
        /// 
        /// Implementing this internal constructor so that this class can't be derived 
        /// outside this assembly
        /// 
        internal MetadataItem()
        { 
        }
        internal MetadataItem(MetadataFlags flags) 
        { 
            _flags = flags;
        } 
        #endregion

        #region Fields
        [Flags] 
        internal enum MetadataFlags {
            // GlobalItem 
            None = 0,  // DataSpace flags are off by one so that zero can be the uninitialized state 
            CSpace = 1,   // (1 << 0)
            OSpace = 2,   // (1 << 1) 
            OCSpace = 3,  // CSpace | OSpace
            SSpace = 4,   // (1 << 2)
            CSSpace = 5,  // CSpace | SSpace
 
            DataSpace = OSpace | CSpace | SSpace | OCSpace | CSSpace,
 
            // MetadataItem 
            Readonly = (1 << 3),
 
            // EdmType
            IsAbstract = (1 << 4),

            // FunctionParameter 
            In = (1 << 9),
            Out = (1 << 10), 
            InOut = In | Out, 
            ReturnValue = (1 << 11),
 
            ParameterMode = (In | Out | InOut | ReturnValue),
        }
        private MetadataFlags _flags;
        private object _flagsLock = new object(); 
        private MetadataCollection _itemAttributes;
        private Documentation _documentation; 
        #endregion 

        #region Properties 

        /// 
        /// Returns the kind of the type
        ///  
        public abstract BuiltInTypeKind BuiltInTypeKind
        { 
            get; 
        }
 
        /// 
        /// List of item attributes on this type
        /// 
        [MetadataProperty(BuiltInTypeKind.MetadataProperty, true)] 
        public ReadOnlyMetadataCollection MetadataProperties
        { 
            get 
            {
                if (null == _itemAttributes) 
                {
                    MetadataPropertyCollection itemAttributes = new MetadataPropertyCollection(this);
                    if (IsReadOnly)
                    { 
                        itemAttributes.SetReadOnly();
                    } 
                    System.Threading.Interlocked.CompareExchange>( 
                        ref _itemAttributes, itemAttributes, null);
                } 
                return _itemAttributes.AsReadOnlyMetadataCollection();
            }
        }
 
        /// 
        /// List of item attributes on this type 
        ///  
        internal MetadataCollection RawMetadataProperties
        { 
            get
            {
                return _itemAttributes;
            } 
        }
 
        ///  
        /// List of item attributes on this type
        ///  
        public Documentation Documentation
        {
            get
            { 
                return _documentation;
            } 
            set 
            {
                _documentation = value; 
            }
        }

        ///  
        /// Identity of the item
        ///  
        internal abstract String Identity { get; } 

        ///  
        /// Just checks for identities to be equal
        /// 
        /// 
        ///  
        internal virtual bool EdmEquals(MetadataItem item)
        { 
            return ((null != item) && 
                    ((this == item) || // same reference
                     (this.BuiltInTypeKind == item.BuiltInTypeKind && 
                      this.Identity == item.Identity)));
        }

        ///  
        /// Returns true if this item is not-changeable. Otherwise returns false.
        ///  
        internal bool IsReadOnly 
        {
            get 
            {
                return GetFlag(MetadataFlags.Readonly);
            }
        } 
        #endregion
 
        #region Methods 
        /// 
        /// Validates the types and sets the readOnly property to true. Once the type is set to readOnly, 
        /// it can never be changed.
        /// 
        internal virtual void SetReadOnly()
        { 
            if (!IsReadOnly)
            { 
                if (null != _itemAttributes) 
                {
                    _itemAttributes.SetReadOnly(); 
                }
                SetFlag(MetadataFlags.Readonly, true);
            }
        } 

        ///  
        /// Builds identity string for this item. By default, the method calls the identity property. 
        /// 
        ///  
        internal virtual void BuildIdentity(StringBuilder builder)
        {
            builder.Append(this.Identity);
        } 

        ///  
        /// Adds the given metadata property to the metadata property collection 
        /// 
        ///  
        internal void AddMetadataProperties(List metadataProperties)
        {
            this.MetadataProperties.Source.AtomicAddRange(metadataProperties);
        } 
        #endregion
 
        #region MetadataFlags 
        internal DataSpace GetDataSpace()
        { 
            switch (_flags & MetadataFlags.DataSpace)
            {
                default: return (DataSpace)(-1);
                case MetadataFlags.CSpace: return DataSpace.CSpace; 
                case MetadataFlags.OSpace: return DataSpace.OSpace;
                case MetadataFlags.SSpace: return DataSpace.SSpace; 
                case MetadataFlags.OCSpace: return DataSpace.OCSpace; 
                case MetadataFlags.CSSpace: return DataSpace.CSSpace;
            } 
        }
        internal void SetDataSpace(DataSpace space)
        {
            _flags = (_flags & ~MetadataFlags.DataSpace) | (MetadataFlags.DataSpace & Convert(space)); 
        }
        private static MetadataFlags Convert(DataSpace space) { 
            switch (space) 
            {
                default: return MetadataFlags.None; // invalid 
                case DataSpace.CSpace: return MetadataFlags.CSpace;
                case DataSpace.OSpace: return MetadataFlags.OSpace;
                case DataSpace.SSpace: return MetadataFlags.SSpace;
                case DataSpace.OCSpace: return MetadataFlags.OCSpace; 
                case DataSpace.CSSpace: return MetadataFlags.CSSpace;
            } 
        } 

        internal ParameterMode GetParameterMode() 
        {
            switch (_flags & MetadataFlags.ParameterMode)
            {
                default: return (ParameterMode)(-1); // invalid 
                case MetadataFlags.In: return ParameterMode.In;
                case MetadataFlags.Out: return ParameterMode.Out; 
                case MetadataFlags.InOut: return ParameterMode.InOut; 
                case MetadataFlags.ReturnValue: return ParameterMode.ReturnValue;
            } 
        }
        internal void SetParameterMode(ParameterMode mode)
        {
            _flags = (_flags & ~MetadataFlags.ParameterMode) | (MetadataFlags.ParameterMode & Convert(mode)); 
        }
        private static MetadataFlags Convert(ParameterMode mode) 
        { 
            switch (mode)
            { 
                default: return MetadataFlags.ParameterMode; // invalid
                case ParameterMode.In: return MetadataFlags.In;
                case ParameterMode.Out: return MetadataFlags.Out;
                case ParameterMode.InOut: return MetadataFlags.InOut; 
                case ParameterMode.ReturnValue: return MetadataFlags.ReturnValue;
            } 
        } 

        internal bool GetFlag(MetadataFlags flag) 
        {
            return (flag == (_flags & flag));
        }
        internal void SetFlag(MetadataFlags flag, bool value) 
        {
            if ((flag & MetadataFlags.Readonly) == MetadataFlags.Readonly) 
            { 
                Debug.Assert(System.Convert.ToInt32(flag & ~MetadataFlags.Readonly,CultureInfo.InvariantCulture) == 0,
                            "SetFlag() invoked with Readonly and additional flags."); 
            }

            lock (_flagsLock)
            { 
                // an attempt to set the ReadOnly flag on a MetadataItem that is already read-only
                // is a no-op 
                // 
                if (IsReadOnly && ((flag & MetadataFlags.Readonly) == MetadataFlags.Readonly))
                { 
                    return;
                }

                Util.ThrowIfReadOnly(this); 
                if (value)
                { 
                    _flags |= flag; 
                }
                else 
                {
                    _flags &= ~flag;
                }
            } 
        }
        #endregion 
    } 
}

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

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