DbCommandTree.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Common / CommandTrees / DbCommandTree.cs / 1305376 / DbCommandTree.cs
                        
                        
                            //---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner  [....]
// @backupOwner [....] 
//--------------------------------------------------------------------- 

using System; 
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Data.Common;
using System.Data.Common.CommandTrees.Internal; 
using System.Data.Common.Utils;
using System.Data.Metadata.Edm; 
using System.Diagnostics; 
using System.Globalization;
using System.IO; 
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
 
namespace System.Data.Common.CommandTrees
{ 
    ///  
    /// Describes the different "kinds" (classes) of command trees.
    ///  
    internal enum DbCommandTreeKind
    {
        Query,
        Update, 
        Insert,
        Delete, 
        Function, 
    }
 
    /// 
    /// DbCommandTree is the abstract base type for the Delete, Query, Insert and Update DbCommandTree types.
    /// 
    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "Db")] 
    public abstract class DbCommandTree
    { 
        // Bid counter 
        private static int s_instanceCount;
        internal readonly int ObjectId = System.Threading.Interlocked.Increment(ref s_instanceCount); 

        // Metadata collection
        private readonly MetadataWorkspace _metadata;
        private readonly DataSpace _dataSpace; 

        ///  
        /// Initializes a new command tree with a given metadata workspace. 
        /// 
        /// The metadata workspace against which the command tree should operate. 
        /// The logical 'space' that metadata in the expressions used in this command tree must belong to.
        internal DbCommandTree(MetadataWorkspace metadata, DataSpace dataSpace)
        {
            using (new EntityBid.ScopeAuto(" %d#", this.ObjectId)) 
            {
                // Ensure the metadata workspace is non-null 
                EntityUtil.CheckArgumentNull(metadata, "metadata"); 

                // Ensure that the data space value is valid 
                if (!DbCommandTree.IsValidDataSpace(dataSpace))
                {
                    throw EntityUtil.Argument(System.Data.Entity.Strings.Cqt_CommandTree_InvalidDataSpace, "dataSpace");
                } 

                // 
                // Create the tree's metadata workspace and initalize commonly used types. 
                //
                MetadataWorkspace effectiveMetadata = new MetadataWorkspace(); 

                //While EdmItemCollection and StorageitemCollections are required
                //ObjectItemCollection may or may not be registered on the workspace yet.
                //So register the ObjectItemCollection if it exists. 
                ItemCollection objectItemCollection;
                if (metadata.TryGetItemCollection(DataSpace.OSpace, out objectItemCollection)) 
                { 
                    effectiveMetadata.RegisterItemCollection(objectItemCollection);
                } 
                effectiveMetadata.RegisterItemCollection(metadata.GetItemCollection(DataSpace.CSpace));
                effectiveMetadata.RegisterItemCollection(metadata.GetItemCollection(DataSpace.CSSpace));
                effectiveMetadata.RegisterItemCollection(metadata.GetItemCollection(DataSpace.SSpace));
 
                this._metadata = effectiveMetadata;
                this._dataSpace = dataSpace; 
            } 
        }
 
        /// 
        /// Gets the name and corresponding type of each parameter that can be referenced within this command tree.
        /// 
        public IEnumerable> Parameters 
        {
            get 
            { 
                using(new EntityBid.ScopeAuto(" %d#", this.ObjectId))
                { 
                    return this.GetParameters();
                }
            }
        } 

        #region Internal Implementation 
 
        /// 
        /// Gets the kind of this command tree. 
        /// 
        internal abstract DbCommandTreeKind CommandTreeKind { get; }

        ///  
        /// Gets the name and type of each parameter declared on the command tree.
        ///  
        ///  
        internal abstract IEnumerable> GetParameters();
 
        /// 
        /// Gets the metadata workspace used by this command tree.
        /// 
        internal MetadataWorkspace MetadataWorkspace { get { return _metadata; } } 

        ///  
        /// Gets the data space in which metadata used by this command tree must reside. 
        /// 
        internal DataSpace DataSpace { get { return _dataSpace; } } 

        #region Dump/Print Support

        internal void Dump(ExpressionDumper dumper) 
        {
            // 
            // Dump information about this command tree to the specified ExpressionDumper 
            //
            // First dump standard information - the DataSpace of the command tree and its parameters 
            //
            Dictionary attrs = new Dictionary();
            attrs.Add("DataSpace", this.DataSpace);
            dumper.Begin(this.GetType().Name, attrs); 

            // 
            // The name and type of each Parameter in turn is added to the output 
            //
            dumper.Begin("Parameters", null); 
            foreach (KeyValuePair param in this.Parameters)
            {
                Dictionary paramAttrs = new Dictionary();
                paramAttrs.Add("Name", param.Key); 
                dumper.Begin("Parameter", paramAttrs);
                dumper.Dump(param.Value, "ParameterType"); 
                dumper.End("Parameter"); 
            }
            dumper.End("Parameters"); 

            //
            // Delegate to the derived type's implementation that dumps the structure of the command tree
            // 
            this.DumpStructure(dumper);
 
            // 
            // Matching call to End to correspond with the call to Begin above
            // 
            dumper.End(this.GetType().Name);
        }

        internal abstract void DumpStructure(ExpressionDumper dumper); 

        internal string DumpXml() 
        { 
            //
            // This is a convenience method that dumps the command tree in an XML format. 
            // This is intended primarily as a debugging aid to allow inspection of the tree structure.
            //
            // Create a new MemoryStream that the XML dumper should write to.
            // 
            MemoryStream stream = new MemoryStream();
 
            // 
            // Create the dumper
            // 
            XmlExpressionDumper dumper = new XmlExpressionDumper(stream);

            //
            // Dump this tree and then close the XML dumper so that the end document tag is written 
            // and the output is flushed to the stream.
            // 
            this.Dump(dumper); 
            dumper.Close();
 
            //
            // Construct a string from the resulting memory stream and return it to the caller
            //
            return XmlExpressionDumper.DefaultEncoding.GetString(stream.ToArray()); 
        }
 
        internal string Print() 
        {
            return this.PrintTree(new ExpressionPrinter()); 
        }

        internal abstract string PrintTree(ExpressionPrinter printer);
 
        #endregion
 
        #region Tracing 

        internal void Trace() 
        {
            if (EntityBid.AdvancedOn)
            {
                EntityBid.PutStrChunked(this.DumpXml()); 
                EntityBid.Trace("\n");
            } 
            else if (EntityBid.TraceOn) 
            {
                EntityBid.PutStrChunked(this.Print()); 
                EntityBid.Trace("\n");
            }
        }
 
        #endregion
 
        internal static bool IsValidDataSpace(DataSpace dataSpace) 
        {
            return (DataSpace.OSpace == dataSpace || 
                    DataSpace.CSpace == dataSpace ||
                    DataSpace.SSpace == dataSpace);
        }
 
        internal static bool IsValidParameterName(string name)
        { 
            return (!StringUtil.IsNullOrEmptyOrWhiteSpace(name) && 
                    _paramNameRegex.IsMatch(name));
        } 
        private static readonly Regex _paramNameRegex = new Regex("^([A-Za-z])([A-Za-z0-9_])*$");

        #endregion
    } 
}

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

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