CollectionTypeElement.cs source code in C# .NET

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

using Som = System.Data.EntityModel.SchemaObjectModel; 
using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.Specialized; 
using System.Diagnostics;
using System.Globalization; 
using System.Xml; 
using System.Xml.Schema;
using System.Data; 
using System.IO;
using System.Data.Metadata.Edm;
using System.Data.Entity;
using System.Text; 

namespace System.Data.EntityModel.SchemaObjectModel 
{ 
    /// 
    /// class representing the Schema element in the schema 
    /// 
    internal class CollectionTypeElement : ModelFunctionTypeElement
    {
        private ModelFunctionTypeElement _typeSubElement = null; 

        #region constructor 
        ///  
        ///
        ///  
        /// 
        internal CollectionTypeElement(SchemaElement parentElement)
            : base(parentElement)
        { 

        } 
        #endregion 

 
        protected override bool HandleAttribute(XmlReader reader)
        {
            if (base.HandleAttribute(reader))
            { 
                return true;
            } 
            else if (CanHandleAttribute(reader, XmlConstants.ElementType)) 
            {
                HandleElementTypeAttribute(reader); 
                return true;
            }

            return false; 
        }
 
        protected void HandleElementTypeAttribute(XmlReader reader) 
        {
            Debug.Assert(reader != null); 

            string type;
            if (!Utils.GetString(Schema, reader, out type))
                return; 

            _unresolvedType = type; 
        } 

        protected override bool HandleElement(XmlReader reader) 
        {
            if (CanHandleElement(reader, XmlConstants.CollectionType))
            {
                HandleCollectionTypeElement(reader); 
                return true;
            } 
            else if (CanHandleElement(reader, XmlConstants.ReferenceType)) 
            {
                HandleReferenceTypeElement(reader); 
                return true;
            }
            else if (CanHandleElement(reader, XmlConstants.TypeRef))
            { 
                HandleTypeRefElement(reader);
                return true; 
            } 
            else if (CanHandleElement(reader, XmlConstants.RowType))
            { 
                HandleRowTypeElement(reader);
                return true;
            }
 
            return false;
        } 
 

        protected void HandleCollectionTypeElement(XmlReader reader) 
        {
            Debug.Assert(reader != null);

            var subElement = new CollectionTypeElement(this); 
            subElement.Parse(reader);
            _typeSubElement = subElement; 
        } 

        protected void HandleReferenceTypeElement(XmlReader reader) 
        {
            Debug.Assert(reader != null);

            var subElement = new ReferenceTypeElement(this); 
            subElement.Parse(reader);
            _typeSubElement = subElement; 
        } 

        protected void HandleTypeRefElement(XmlReader reader) 
        {
            Debug.Assert(reader != null);

            var subElement = new TypeRefElement(this); 
            subElement.Parse(reader);
            _typeSubElement = subElement; 
        } 

        protected void HandleRowTypeElement(XmlReader reader) 
        {
            Debug.Assert(reader != null);

            var subElement = new RowTypeElement(this); 
            subElement.Parse(reader);
            _typeSubElement = subElement; 
        } 

        internal override void ResolveTopLevelNames() 
        {

            if (_typeSubElement != null)
            { 
                _typeSubElement.ResolveTopLevelNames();
            } 
 
            // Can't be "else if" because element could have attribute AND sub-element,
            // in which case semantic validation won't work unless it has resolved both (so _type is not null) 
            if( _unresolvedType != null)
            {
                base.ResolveTopLevelNames();
            } 

        } 
 
        internal override void WriteIdentity(StringBuilder builder)
        { 

            if (UnresolvedType != null && !UnresolvedType.Trim().Equals(String.Empty))
            {
                builder.Append("Collection(" + UnresolvedType + ")"); 
            }
            else 
            { 
                builder.Append("Collection(");
                _typeSubElement.WriteIdentity(builder); 
                builder.Append(")");
            }
        }
 
        internal override TypeUsage GetTypeUsage()
        { 
            if (_typeUsage != null) 
            {
                return _typeUsage; 
            }
            Debug.Assert(_typeSubElement != null, "For attributes typeusage should have been resolved");

            if (_typeSubElement != null) 
            {
                CollectionType collectionType = new CollectionType(_typeSubElement.GetTypeUsage()); 
 
                collectionType.AddMetadataProperties(this.OtherContent);
                _typeUsage = TypeUsage.Create(collectionType); 
            }
            return _typeUsage;
        }
 
        internal override bool ResolveNameAndSetTypeUsage(Converter.ConversionCache convertedItemCache, Dictionary newGlobalItems)
        { 
            if (_typeUsage == null) 
            {
                if (_typeSubElement != null) //Has sub-elements 
                {
                    return _typeSubElement.ResolveNameAndSetTypeUsage(convertedItemCache, newGlobalItems);
                }
                else //Does not have sub-elements; try to resolve 
                {
                    if (_type is ScalarType) //Create and store type usage for scalar type 
                    { 
                        _typeUsageBuilder.ValidateAndSetTypeUsage(_type as ScalarType, false);
                        _typeUsage = TypeUsage.Create(new CollectionType(_typeUsageBuilder.TypeUsage)); 
                        return true;
                    }
                    else  //Try to resolve edm type. If not now, it will resolve in the second pass
                    { 
                        EdmType edmType = (EdmType)Converter.LoadSchemaElement(_type, _type.Schema.ProviderManifest, convertedItemCache, newGlobalItems);
                        if (edmType != null) 
                        { 
                            _typeUsageBuilder.ValidateAndSetTypeUsage(edmType, false); //use typeusagebuilder so dont lose facet information
                            _typeUsage = TypeUsage.Create(new CollectionType(_typeUsageBuilder.TypeUsage)); 
                        }

                        return _typeUsage != null;
                    } 
                }
            } 
            return true; 
        }
 
        internal override void Validate()
        {
            base.Validate();
 
            if (_type != null && _type is ScalarType == false && _typeUsageBuilder.HasUserDefinedFacets)
            { 
                //Non-scalar return type should not have Facets 
                AddError(ErrorCode.ModelFuncionFacetOnNonScalarType, EdmSchemaErrorSeverity.Error, Strings.FacetsOnNonScalarType(_type.FQName));
            } 

            if (_type == null && _typeUsageBuilder.HasUserDefinedFacets)
            {
                //Type attribute not specified but facets exist 
                AddError(ErrorCode.ModelFunctionIncorrectlyPlacedFacet, EdmSchemaErrorSeverity.Error, Strings.FacetDeclarationRequiresTypeAttribute);
            } 
 
            if (_type == null && _typeSubElement == null)
            { 
                //Type not declared as either attribute or subelement
                AddError(ErrorCode.ModelFunctionTypeNotDeclared, EdmSchemaErrorSeverity.Error, Strings.TypeMustBeDeclared);
            }
 
            if (_type != null && _typeSubElement != null)
            { 
                //Both attribute and sub-element declarations exist 
                AddError(ErrorCode.TypeDeclaredAsAttributeAndElement, EdmSchemaErrorSeverity.Error, Strings.TypeDeclaredAsAttributeAndElement);
            } 

            if (_typeSubElement != null)
            {
                _typeSubElement.Validate(); 
            }
        } 
    } 
}

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

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