NavigationPropertyEmitter.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 / DataWeb / Design / system / Data / EntityModel / Emitters / NavigationPropertyEmitter.cs / 1305376 / NavigationPropertyEmitter.cs
                        

                        
                            //---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner       [....]
// @backupOwner [....] 
//--------------------------------------------------------------------- 

using System.CodeDom; 
using System.Collections.Generic;
using System.Data.Metadata.Edm;
using System.Data.Services.Design;
using System.Diagnostics; 

namespace System.Data.EntityModel.Emitters 
{ 
    /// 
    /// Summary description for NavigationPropertyEmitter. 
    /// 
    internal sealed class NavigationPropertyEmitter : PropertyEmitterBase
    {
        private const string ValuePropertyName = "Value"; 

        ///  
        /// 
        /// 
        ///  
        /// 
        public NavigationPropertyEmitter(ClientApiGenerator generator, NavigationProperty navigationProperty, bool declaringTypeUsesStandardBaseType)
            : base(generator, navigationProperty, declaringTypeUsesStandardBaseType)
        { 
        }
 
        ///  
        /// Generate the navigation property
        ///  
        /// The type to add the property to.
        protected override void EmitProperty(CodeTypeDeclaration typeDecl)
        {
            EmitNavigationProperty(typeDecl); 
        }
 
        ///  
        /// Generate the navigation property specified
        ///  
        /// The type to add the property to.
        private void EmitNavigationProperty(CodeTypeDeclaration typeDecl)
        {
            // create a regular property 
            CodeMemberProperty property = EmitNavigationProperty(Item.ToEndMember);
            typeDecl.Members.Add(property); 
 
            EmitField(typeDecl, GetReturnType(Item.ToEndMember), Item.ToEndMember.RelationshipMultiplicity == RelationshipMultiplicity.Many);
        } 

        private void EmitField(CodeTypeDeclaration typeDecl, CodeTypeReference fieldType, bool hasDefault)
        {
            CodeMemberField memberField = new CodeMemberField(fieldType, Utils.FieldNameFromPropName(Item.Name)); 
            memberField.Attributes = MemberAttributes.Private;
 
            AttributeEmitter.AddGeneratedCodeAttribute(memberField); 

            if (hasDefault) 
            {
                if (this.Generator.UseDataServiceCollection)
                {
                    // new DataServiceCollection(null, System.Data.Services.Client.TrackingMode.None, null, null, null); 
                    // declare type is DataServiceCollection
                    Debug.Assert(fieldType.TypeArguments.Count == 1, "Declare type is non generic."); 
 
                    // new DataServiceCollection<[type]>(null, TrackingMode.None)
                    memberField.InitExpression = new CodeObjectCreateExpression( 
                        fieldType,
                        new CodePrimitiveExpression(null),
                        new CodeFieldReferenceExpression(
                            new CodeTypeReferenceExpression(typeof(System.Data.Services.Client.TrackingMode)), 
                            "None"));
                } 
                else 
                {
                    memberField.InitExpression = new CodeObjectCreateExpression(fieldType); 
                }
            }

            typeDecl.Members.Add(memberField); 
        }
 
        ///  
        /// Generate a navigation property
        ///  
        /// the other end
        /// True to emit Reference navigation property
        /// the generated property
        private CodeMemberProperty EmitNavigationProperty(RelationshipEndMember target) 
        {
            CodeTypeReference typeRef = GetReturnType(target); 
 
            // raise the PropertyGenerated event
            PropertyGeneratedEventArgs eventArgs = new PropertyGeneratedEventArgs(Item, 
                                                                                  null, // no backing field
                                                                                  typeRef);
            this.Generator.RaisePropertyGeneratedEvent(eventArgs);
 
            // [System.ComponentModel.Browsable(false)]
            // public TargetType TargetName 
            // public EntityReference TargetName 
            // or
            // public EntityCollection TargetNames 
            CodeMemberProperty property = new CodeMemberProperty();

            // Only reference navigation properties are currently currently supported with XML serialization
            // and thus we should use the XmlIgnore and SoapIgnore attributes on other property types. 
            AttributeEmitter.AddIgnoreAttributes(property);
 
            AttributeEmitter.AddBrowsableAttribute(property); 

            AttributeEmitter.AddGeneratedCodeAttribute(property); 

            CommentEmitter.EmitSummaryComments(Item, property.Comments);

            property.Name = Item.Name; 

            if (eventArgs.ReturnType != null && !eventArgs.ReturnType.Equals(typeRef)) 
            { 
                property.Type = eventArgs.ReturnType;
            } 
            else
            {
                property.Type = typeRef;
            } 

            property.Attributes = MemberAttributes.Final; 
 
            CodeExpression getMethod = EmitGetMethod(target);
            CodeExpression getReturnExpression; 

            if (target.RelationshipMultiplicity != RelationshipMultiplicity.Many)
            {
                property.Attributes |= AccessibilityFromGettersAndSetters(Item); 

                // insert user-supplied Set code here, before the assignment 
                // 
                List additionalSetStatements = eventArgs.AdditionalSetStatements;
                if (additionalSetStatements != null && additionalSetStatements.Count > 0) 
                {
                    try
                    {
                        property.SetStatements.AddRange(additionalSetStatements.ToArray()); 
                    }
                    catch (ArgumentNullException e) 
                    { 
                        Generator.AddError(Strings.InvalidSetStatementSuppliedForProperty(Item.Name),
                                           ModelBuilderErrorCode.InvalidSetStatementSuppliedForProperty, 
                                           EdmSchemaErrorSeverity.Error,
                                           e);
                    }
                } 

                CodeExpression valueRef = new CodePropertySetValueReferenceExpression(); 
                if (typeRef != eventArgs.ReturnType) 
                {
                    // we need to cast to the actual type 
                    valueRef = new CodeCastExpression(typeRef, valueRef);
                }

 
                CodeExpression valueProperty = getMethod;
 
                // get 
                //     return ((IEntityWithRelationships)this).RelationshipManager.GetRelatedReference("CSpaceQualifiedRelationshipName", "TargetRoleName").Value;
                getReturnExpression = valueProperty; 

                // set
                //     ((IEntityWithRelationships)this).RelationshipManager.GetRelatedReference("CSpaceQualifiedRelationshipName", "TargetRoleName").Value = value;
                property.SetStatements.Add( 
                    new CodeAssignStatement(valueProperty, valueRef));
 
                // setup the accessibility of the navigation property setter and getter 
                MemberAttributes propertyAccessibility = property.Attributes & MemberAttributes.AccessMask;
                PropertyEmitter.AddGetterSetterFixUp(Generator.FixUps, GetFullyQualifiedPropertyName(property.Name), 
                    PropertyEmitter.GetGetterAccessibility(Item), propertyAccessibility, true);
                PropertyEmitter.AddGetterSetterFixUp(Generator.FixUps, GetFullyQualifiedPropertyName(property.Name),
                    PropertyEmitter.GetSetterAccessibility(Item), propertyAccessibility, false);
 
                List additionalAfterSetStatements = eventArgs.AdditionalAfterSetStatements;
                if (additionalAfterSetStatements != null && additionalAfterSetStatements.Count > 0) 
                { 
                    try
                    { 
                        property.SetStatements.AddRange(additionalAfterSetStatements.ToArray());
                    }
                    catch (ArgumentNullException e)
                    { 
                        Generator.AddError(Strings.InvalidSetStatementSuppliedForProperty(Item.Name),
                                           ModelBuilderErrorCode.InvalidSetStatementSuppliedForProperty, 
                                           EdmSchemaErrorSeverity.Error, 
                                           e);
                    } 
                }
            }
            else
            { 
                property.Attributes |= PropertyEmitter.GetGetterAccessibility(Item);
                // get 
                //     return ((IEntityWithRelationships)this).RelationshipManager.GetRelatedCollection("CSpaceQualifiedRelationshipName", "TargetRoleName"); 
                getReturnExpression = getMethod;
 
                // set
                // if (value != null) ==> Only for non-binding scenario
                // {
                //    this = 
                //    this.OnPropertyChanged("")
                // } 
 
                CodeExpression valueRef = new CodePropertySetValueReferenceExpression();
 
                CodeStatementCollection csc = null;

                if (this.Generator.UseDataServiceCollection == true)
                { 
                    csc = property.SetStatements;
                } 
                else 
                {
                    CodeConditionStatement ccs = new CodeConditionStatement(EmitExpressionDoesNotEqualNull(valueRef)); 
                    property.SetStatements.Add(ccs);

                    csc = ccs.TrueStatements;
                } 

                csc.Add(new CodeAssignStatement(getMethod, valueRef)); 
 
                if (eventArgs.AdditionalAfterSetStatements != null)
                { 
                    try
                    {
                        foreach (CodeStatement s in eventArgs.AdditionalAfterSetStatements)
                        { 
                            csc.Add(s);
                        } 
                    } 
                    catch (ArgumentNullException e)
                    { 
                        Generator.AddError(Strings.InvalidSetStatementSuppliedForProperty(Item.Name),
                                           ModelBuilderErrorCode.InvalidSetStatementSuppliedForProperty,
                                           EdmSchemaErrorSeverity.Error,
                                           e); 
                    }
                } 
            } 

            // if additional Get statements were specified by the event subscriber, insert them now 
            //
            List additionalGetStatements = eventArgs.AdditionalGetStatements;
            if (additionalGetStatements != null && additionalGetStatements.Count > 0)
            { 
                try
                { 
                    property.GetStatements.AddRange(additionalGetStatements.ToArray()); 
                }
                catch (ArgumentNullException ex) 
                {
                    Generator.AddError(Strings.InvalidGetStatementSuppliedForProperty(Item.Name),
                                       ModelBuilderErrorCode.InvalidGetStatementSuppliedForProperty,
                                       EdmSchemaErrorSeverity.Error, 
                                       ex);
                } 
            } 

            property.GetStatements.Add(new CodeMethodReturnStatement(getReturnExpression)); 

            return property;
        }
 
        internal static bool IsNameAlreadyAMemberName(StructuralType type, string generatedPropertyName, StringComparison comparison)
        { 
            foreach (EdmMember member in type.Members) 
            {
                if (member.DeclaringType == type && 
                    member.Name.Equals(generatedPropertyName, comparison))
                {
                    return true;
                } 
            }
 
            return false; 
        }
 
        private string GetFullyQualifiedPropertyName(string propertyName)
        {
            return Item.DeclaringType.FullName + "." + propertyName;
        } 

        ///  
        /// Gives the SchemaElement back cast to the most 
        /// appropriate type
        ///  
        private new NavigationProperty Item
        {
            get
            { 
                return base.Item as NavigationProperty;
            } 
        } 

        ///  
        /// Get the return type for the get method, given the target end
        /// 
        /// 
        /// true if the is the return type for a reference property 
        /// the return type for a target
        private CodeTypeReference GetReturnType(RelationshipEndMember target) 
        { 
            CodeTypeReference returnType = Generator.GetLeastPossibleQualifiedTypeReference(GetEntityType(target));
 
            if (target.RelationshipMultiplicity == RelationshipMultiplicity.Many)
            {
                returnType = TypeReference.FrameworkGenericClass(this.Generator.GetRelationshipMultiplicityManyCollectionTypeName(), returnType);
            } 

            return returnType; 
        } 

        private static EntityTypeBase GetEntityType(RelationshipEndMember endMember) 
        {
            Debug.Assert((BuiltInTypeKind.RefType == endMember.TypeUsage.EdmType.BuiltInTypeKind), "not a reference type");
            EntityTypeBase type = ((RefType)endMember.TypeUsage.EdmType).ElementType;
            return type; 
        }
 
        ///  
        /// Emit the GetRelatedCollection or GetRelatedReference methods
        ///  
        /// Target end of the relationship
        /// Expression to invoke the appropriate method
        private CodeExpression EmitGetMethod(RelationshipEndMember target)
        { 
            return new CodeFieldReferenceExpression(ThisRef, Utils.FieldNameFromPropName(Item.Name));
        } 
    } 
}

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

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