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//---------------------------------------------------------------------
// <copyright file="ModelFunction.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//
// @owner [....]
// @backupOwner [....]
//---------------------------------------------------------------------
namespace System.Data.EntityModel.SchemaObjectModel
{
using System.Data.Entity;
using System.Data.Metadata.Edm;
using System.Diagnostics;
using System.Xml;
/// <summary>
/// class representing the Schema element in the schema
/// </summary>
internal sealed class ModelFunction : Function
{
private TypeUsageBuilder _typeUsageBuilder;
#region Public Methods
/// <summary>
/// ctor for a schema function
/// </summary>
public ModelFunction(Schema parentElement)
:
base(parentElement)
{
_isComposable = true;
_typeUsageBuilder = new TypeUsageBuilder(this);
}
#endregion
public override SchemaType Type
{
get
{
return this._type;
}
}
internal TypeUsage TypeUsage
{
get
{
if (_typeUsageBuilder.TypeUsage == null)
{
return null;
}
else if (CollectionKind != CollectionKind.None)
{
return TypeUsage.Create(new CollectionType(_typeUsageBuilder.TypeUsage));
}
else
{
return _typeUsageBuilder.TypeUsage;
}
}
}
internal void ValidateAndSetTypeUsage(ScalarType scalar)
{
_typeUsageBuilder.ValidateAndSetTypeUsage(scalar, false);
}
internal void ValidateAndSetTypeUsage(EdmType edmType)
{
_typeUsageBuilder.ValidateAndSetTypeUsage(edmType, false);
}
#region Protected Properties
protected override bool HandleElement(XmlReader reader)
{
if (base.HandleElement(reader))
{
return true;
}
else if (CanHandleElement(reader, XmlConstants.DefiningExpression))
{
HandleDefiningExpressionElment(reader);
return true;
}
else if (CanHandleElement(reader, XmlConstants.Parameter))
{
HandleParameterElement(reader);
return true;
}
return false;
}
protected override void HandleReturnTypeAttribute(XmlReader reader)
{
base.HandleReturnTypeAttribute(reader);
_isComposable = true;
}
protected override bool HandleAttribute(XmlReader reader)
{
if (base.HandleAttribute(reader))
{
return true;
}
else if (_typeUsageBuilder.HandleAttribute(reader))
{
return true;
}
return false;
}
internal override void ResolveTopLevelNames()
{
if (null != UnresolvedReturnType)
{
if (Schema.ResolveTypeName(this, UnresolvedReturnType, out _type))
{
if (_type is ScalarType)
{
_typeUsageBuilder.ValidateAndSetTypeUsage(_type as ScalarType, false);
}
}
}
foreach (Parameter parameter in this.Parameters)
{
parameter.ResolveTopLevelNames();
}
if (ReturnTypeList != null)
{
Debug.Assert(ReturnTypeList.Count == 1, "returnTypeList should always be non-empty. Multiple ReturnTypes are only possible on FunctionImports.");
ReturnTypeList[0].ResolveTopLevelNames();
}
}
#endregion
private void HandleDefiningExpressionElment(XmlReader reader)
{
Debug.Assert(reader != null);
FunctionCommandText commandText = new FunctionCommandText(this);
commandText.Parse(reader);
_commandText = commandText;
}
internal override void Validate()
{
base.Validate();
ValidationHelper.ValidateFacets(this, _type, _typeUsageBuilder);
if (_isRefType)
{
ValidationHelper.ValidateRefType(this, _type);
}
}
}
}
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