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//---------------------------------------------------------------------
// <copyright file="Relationship.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//
// @owner Microsoft
// @backupOwner Microsoft
//---------------------------------------------------------------------
namespace System.Data.EntityModel.SchemaObjectModel
{
using System.Collections.Generic;
using System.Data.Metadata.Edm;
using System.Data.Objects.DataClasses;
using System.Diagnostics;
using System.Xml;
/// <summary>
/// Represents an Association element
/// </summary>
internal sealed class Relationship : SchemaType, IRelationship
{
private RelationshipKind _relationshipKind;
private RelationshipEndCollection _ends;
private List<ReferentialConstraint> _constraints;
private bool _isForeignKey;
/// <summary>
/// Construct a Relationship object
/// </summary>
/// <param name="parent">the parent</param>
/// <param name="kind">the kind of relationship</param>
public Relationship(Schema parent, RelationshipKind kind)
: base(parent)
{
RelationshipKind = kind;
if (Schema.DataModel == SchemaDataModelOption.EntityDataModel)
{
_isForeignKey = false;
OtherContent.Add(Schema.SchemaSource);
}
else if (Schema.DataModel == SchemaDataModelOption.ProviderDataModel)
{
_isForeignKey = true;
}
}
/// <summary>
/// List of Ends defined for this Association
/// </summary>
public IList<IRelationshipEnd> Ends
{
get
{
if ( _ends == null )
_ends = new RelationshipEndCollection();
return _ends;
}
}
/// <summary>
/// Returns the list of constraints on this relation
/// </summary>
public IList<ReferentialConstraint> Constraints
{
get
{
if (_constraints == null)
{
_constraints = new List<ReferentialConstraint>();
}
return _constraints;
}
}
public bool TryGetEnd( string roleName, out IRelationshipEnd end )
{
return _ends.TryGetEnd( roleName, out end );
}
/// <summary>
/// Is this an Association
/// </summary>
public RelationshipKind RelationshipKind
{
get
{
return _relationshipKind;
}
private set
{
_relationshipKind = value;
}
}
/// <summary>
/// Is this a foreign key (aka foreign key) relationship?
/// </summary>
public bool IsForeignKey
{
get { return _isForeignKey; }
}
/// <summary>
/// do whole element validation
/// </summary>
/// <returns></returns>
internal override void Validate()
{
base.Validate();
bool foundOperations = false;
foreach ( RelationshipEnd end in Ends )
{
end.Validate();
if ( RelationshipKind == RelationshipKind.Association )
{
if ( end.Operations.Count > 0 )
{
if ( foundOperations )
end.AddError( ErrorCode.InvalidOperation, EdmSchemaErrorSeverity.Error, System.Data.Entity.Strings.InvalidOperationMultipleEndsInAssociation);
foundOperations = true;
}
}
}
if (Constraints.Count == 0)
{
if (this.Schema.DataModel == SchemaDataModelOption.ProviderDataModel)
{
AddError(ErrorCode.MissingConstraintOnRelationshipType,
EdmSchemaErrorSeverity.Error,
System.Data.Entity.Strings.MissingConstraintOnRelationshipType(FQName));
}
}
else
{
foreach (ReferentialConstraint constraint in Constraints)
{
constraint.Validate();
}
}
}
/// <summary>
/// do whole element resolution
/// </summary>
internal override void ResolveTopLevelNames()
{
base.ResolveTopLevelNames();
foreach ( RelationshipEnd end in Ends )
end.ResolveTopLevelNames();
foreach (ReferentialConstraint referentialConstraint in Constraints)
{
referentialConstraint.ResolveTopLevelNames();
}
}
protected override bool HandleElement(XmlReader reader)
{
if (base.HandleElement(reader))
{
return true;
}
else if (CanHandleElement(reader, XmlConstants.End))
{
HandleEndElement(reader);
return true;
}
else if (CanHandleElement(reader, XmlConstants.ReferentialConstraint))
{
HandleConstraintElement(reader);
return true;
}
return false;
}
/// <summary>
/// handle the End child element
/// </summary>
/// <param name="reader">XmlReader positioned at the end element</param>
private void HandleEndElement(XmlReader reader)
{
Debug.Assert(reader != null);
RelationshipEnd end = new RelationshipEnd(this);
end.Parse(reader);
if (Ends.Count == 2)
{
AddError( ErrorCode.InvalidAssociation, EdmSchemaErrorSeverity.Error, System.Data.Entity.Strings.TooManyAssociationEnds(FQName ) );
return;
}
Ends.Add(end);
}
/// <summary>
/// handle the constraint element
/// </summary>
/// <param name="reader">XmlReader positioned at the constraint element</param>
private void HandleConstraintElement(XmlReader reader)
{
Debug.Assert(reader != null);
ReferentialConstraint constraint = new ReferentialConstraint(this);
constraint.Parse(reader);
this.Constraints.Add(constraint);
if (this.Schema.DataModel == SchemaDataModelOption.EntityDataModel && this.Schema.SchemaVersion >= XmlConstants.EdmVersionForV2)
{
// in V2, referential constraint implies foreign key
_isForeignKey = true;
}
}
}
}
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