EdmFunction.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 / EdmFunction.cs / 1305376 / EdmFunction.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.Diagnostics; 
using System.Text;
 
namespace System.Data.Metadata.Edm 
{
    ///  
    /// Class for representing a function
    /// 
    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1704:IdentifiersShouldBeSpelledCorrectly", MessageId = "Edm")]
    public sealed class EdmFunction : EdmType 
    {
        #region Constructors 
        internal EdmFunction(string name, string namespaceName, DataSpace dataSpace, EdmFunctionPayload payload) 
            : base(name, namespaceName, dataSpace)
        { 
            //---- name of the 'schema'
            //---- this is used by the SQL Gen utility and update pipeline to support generation of the correct function name in the store
            _schemaName = payload.Schema;
            _fullName = this.NamespaceName + "." + this.Name; 

 
            if (payload.ReturnParameter != null) 
            {
                Debug.Assert(payload.ReturnParameter.Mode == ParameterMode.ReturnValue, "Return parameter in a function must have the ParameterMode equal to ReturnValue."); 

                _returnParameter = SafeLink.BindChild(this, FunctionParameter.DeclaringFunctionLinker, payload.ReturnParameter);
            }
 
            if (payload.IsAggregate.HasValue) SetFunctionAttribute(ref _functionAttributes, FunctionAttributes.Aggregate, payload.IsAggregate.Value);
            if (payload.IsBuiltIn.HasValue) SetFunctionAttribute(ref _functionAttributes, FunctionAttributes.BuiltIn, payload.IsBuiltIn.Value); 
            if (payload.IsNiladic.HasValue) SetFunctionAttribute(ref _functionAttributes, FunctionAttributes.NiladicFunction, payload.IsNiladic.Value); 
            if (payload.IsComposable.HasValue) SetFunctionAttribute(ref _functionAttributes, FunctionAttributes.IsComposable, payload.IsComposable.Value);
            if (payload.IsFromProviderManifest.HasValue) SetFunctionAttribute(ref _functionAttributes, FunctionAttributes.IsFromProviderManifest, payload.IsFromProviderManifest.Value); 
            if (payload.IsCachedStoreFunction.HasValue) SetFunctionAttribute(ref _functionAttributes, FunctionAttributes.IsCachedStoreFunction, payload.IsCachedStoreFunction.Value);

            if (payload.ParameterTypeSemantics.HasValue)
            { 
                _parameterTypeSemantics = payload.ParameterTypeSemantics.Value;
            } 
 
            if (payload.StoreFunctionName != null)
            { 
                _storeFunctionNameAttribute = payload.StoreFunctionName;
            }

            if (payload.EntitySet != null) 
            {
                _entitySet = payload.EntitySet; 
            } 

            if (payload.CommandText != null) 
            {
                _commandTextAttribute = payload.CommandText;
            }
 
            if (payload.Parameters != null)
            { 
                // validate the parameters 
                foreach (FunctionParameter parameter in payload.Parameters)
                { 
                    if (parameter == null)
                    {
                        throw EntityUtil.CollectionParameterElementIsNull("parameters");
                    } 
                    Debug.Assert(parameter.Mode != ParameterMode.ReturnValue, "No function parameter can have ParameterMode equal to ReturnValue.");
                } 
 
                // Populate the parameters
                _parameters = new SafeLinkCollection(this, FunctionParameter.DeclaringFunctionLinker, new MetadataCollection(payload.Parameters)); 
            }
            else
            {
                _parameters = new ReadOnlyMetadataCollection(new MetadataCollection()); 
            }
        } 
 
        #endregion
 
        #region Fields
        private readonly FunctionParameter _returnParameter;
        private readonly ReadOnlyMetadataCollection _parameters;
        private readonly FunctionAttributes _functionAttributes = FunctionAttributes.Default; 
        private readonly string _storeFunctionNameAttribute;
        private readonly ParameterTypeSemantics _parameterTypeSemantics; 
        private readonly string _commandTextAttribute; 
        private readonly string _schemaName;
        private readonly EntitySet _entitySet; 
        private readonly string _fullName;
        #endregion

        #region Properties 
        /// 
        /// Returns the kind of the type 
        ///  
        public override BuiltInTypeKind BuiltInTypeKind { get { return BuiltInTypeKind.EdmFunction; } }
 
        /// 
        /// Returns the full name of this type, which is namespace + "." + name.
        /// 
        public override string FullName 
        {
            get 
            { 
                return _fullName;
            } 
        }

        /// 
        /// Gets the collection of parameters 
        /// 
        public ReadOnlyMetadataCollection Parameters 
        { 
            get
            { 
                return _parameters;
            }
        }
 
        /// 
        /// Returns true if this is a C-space function and it has a body defined in . 
        ///  
        internal bool HasUserDefinedBody
        { 
            get
            {
                return this.DataSpace == DataSpace.CSpace && !String.IsNullOrEmpty(this.CommandTextAttribute);
            } 
        }
 
        ///  
        /// For function imports, optionally indicates the entity set to which the import is bound.
        ///  
        [MetadataProperty(BuiltInTypeKind.EntitySet, false)]
        internal EntitySet EntitySet
        {
            get 
            {
                return _entitySet; 
            } 
        }
 
        /// 
        /// Gets the return parameter of this function
        /// 
        /// Thrown iif value passed into setter is null 
        /// Thrown if the Function instance is in ReadOnly state
        [MetadataProperty(BuiltInTypeKind.FunctionParameter, false)] 
        public FunctionParameter ReturnParameter 
        {
            get 
            {
                return _returnParameter;
            }
        } 

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

        [MetadataProperty(typeof(ParameterTypeSemantics), false)]
        internal ParameterTypeSemantics ParameterTypeSemanticsAttribute 
        {
            get { return _parameterTypeSemantics; } 
        } 

        // Function attribute parameters 
        [MetadataProperty(PrimitiveTypeKind.Boolean, false)]
        internal bool AggregateAttribute
        {
            get 
            {
                return GetFunctionAttribute(FunctionAttributes.Aggregate); 
            } 
        }
 
        [MetadataProperty(PrimitiveTypeKind.Boolean, false)]
        internal bool BuiltInAttribute
        {
            get 
            {
                return GetFunctionAttribute(FunctionAttributes.BuiltIn); 
            } 
        }
 
        [MetadataProperty(PrimitiveTypeKind.Boolean, false)]
        internal bool IsFromProviderManifest
        {
            get 
            {
                return GetFunctionAttribute(FunctionAttributes.IsFromProviderManifest); 
            } 
        }
 
        [MetadataProperty(PrimitiveTypeKind.Boolean, false)]
        internal bool NiladicFunctionAttribute
        {
            get 
            {
                return GetFunctionAttribute(FunctionAttributes.NiladicFunction); 
            } 
        }
 
        [MetadataProperty(PrimitiveTypeKind.Boolean, false)]
        internal bool IsComposableAttribute
        {
            get 
            {
                return GetFunctionAttribute(FunctionAttributes.IsComposable); 
            } 
        }
 
        [MetadataProperty(PrimitiveTypeKind.String, false)]
        public string CommandTextAttribute
        {
            get 
            {
                return _commandTextAttribute; 
            } 
        }
 
        [MetadataProperty(PrimitiveTypeKind.String, false)]
        internal string Schema
        {
            get 
            {
                return _schemaName; 
            } 
        }
        #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();
                this.Parameters.Source.SetReadOnly();
                FunctionParameter returnParameter = ReturnParameter;
                if (returnParameter != null) 
                {
                    returnParameter.SetReadOnly(); 
                } 
            }
        } 

        /// 
        /// Builds function identity string in the form of "functionName (param1, param2, ... paramN)".
        ///  
        internal override void BuildIdentity(StringBuilder builder)
        { 
            // If we've already cached the identity, simply append it 
            if (null != CacheIdentity)
            { 
                builder.Append(CacheIdentity);
                return;
            }
 
            EdmFunction.BuildIdentity(
                builder, 
                FullName, 
                Parameters,
                (param) => param.TypeUsage, 
                (param) => param.Mode);
        }

        ///  
        /// Builds identity based on the functionName and parameter types. All parameters are assumed to be .
        /// Returns string in the form of "functionName (param1, param2, ... paramN)". 
        ///  
        internal static string BuildIdentity(string functionName, IEnumerable functionParameters)
        { 
            StringBuilder identity = new StringBuilder();

            BuildIdentity(
                identity, 
                functionName,
                functionParameters, 
                (param) => param, 
                (param) => ParameterMode.In);
 
            return identity.ToString();
        }

        ///  
        /// Builds identity based on the functionName and parameters metadata.
        /// Returns string in the form of "functionName (param1, param2, ... paramN)". 
        ///  
        internal static void BuildIdentity(StringBuilder builder,
                                                               string functionName, 
                                                               IEnumerable functionParameters,
                                                               Func getParameterTypeUsage,
                                                               Func getParameterMode)
        { 
            //
            // Note: some callers depend on the format of the returned identity string. 
            // 

            // Start with the function name 
            builder.Append(functionName);

            // Then add the string representing the list of parameters
            builder.Append('('); 
            bool first = true;
            foreach (TParameterMetadata parameter in functionParameters) 
            { 
                if (first) { first = false; }
                else { builder.Append(","); } 
                builder.Append(Helper.ToString(getParameterMode(parameter)));
                builder.Append(' ');
                getParameterTypeUsage(parameter).BuildIdentity(builder);
            } 
            builder.Append(')');
        } 
 
        private bool GetFunctionAttribute(FunctionAttributes attribute)
        { 
            return attribute == (attribute & _functionAttributes);
        }

        private static void SetFunctionAttribute(ref FunctionAttributes field, FunctionAttributes attribute, bool isSet) 
        {
            if (isSet) 
            { 
                // make sure that attribute bits are set to 1
                field |= attribute; 
            }
            else
            {
                // make sure that attribute bits are set to 0 
                field ^= field & attribute;
            } 
        } 

        #endregion 

        #region Nested types
        [Flags]
        private enum FunctionAttributes : byte 
        {
            None = 0, 
            Aggregate = 1, 
            BuiltIn = 2,
            NiladicFunction = 4, 
            IsComposable = 8,
            IsFromProviderManifest = 16,
            IsCachedStoreFunction = 32,
            Default = IsComposable, 
        }
        #endregion 
    } 

    internal struct EdmFunctionPayload 
    {
        public string Name;
        public string NamespaceName;
        public string Schema; 
        public string StoreFunctionName;
        public string CommandText; 
        public EntitySet EntitySet; 
        public bool? IsAggregate;
        public bool? IsBuiltIn; 
        public bool? IsNiladic;
        public bool? IsComposable;
        public bool? IsFromProviderManifest;
        public bool? IsCachedStoreFunction; 
        public FunctionParameter ReturnParameter;
        public ParameterTypeSemantics? ParameterTypeSemantics; 
        public FunctionParameter[] Parameters; 
        public DataSpace DataSpace;
    } 

}

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