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//---------------------------------------------------------------------
// <copyright file="RelationshipEnd.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.Diagnostics;
using System.Xml;
/// <summary>
/// Represents an End element in a relationship
/// </summary>
internal sealed class RelationshipEnd : SchemaElement, IRelationshipEnd
{
private string _unresolvedType;
private RelationshipMultiplicity? _multiplicity;
private SchemaEntityType _type;
private List<OnOperation> _operations;
/// <summary>
/// construct a Relationship End
/// </summary>
/// <param name="relationship"></param>
public RelationshipEnd(Relationship relationship)
: base(relationship)
{
}
/// <summary>
/// Type of the End
/// </summary>
public SchemaEntityType Type
{
get
{
return _type;
}
private set
{
_type = value;
}
}
/// <summary>
/// Multiplicity of the End
/// </summary>
public RelationshipMultiplicity? Multiplicity
{
get
{
return _multiplicity;
}
set
{
_multiplicity = value;
}
}
/// <summary>
/// The On<Operation>s defined for the End
/// </summary>
public ICollection<OnOperation> Operations
{
get
{
if (_operations == null)
_operations = new List<OnOperation>();
return _operations;
}
}
/// <summary>
/// do whole element resolution
/// </summary>
internal override void ResolveTopLevelNames()
{
base.ResolveTopLevelNames();
if (Type == null && _unresolvedType != null)
{
SchemaType element;
if (!Schema.ResolveTypeName(this, _unresolvedType, out element))
{
return;
}
Type = element as SchemaEntityType;
if (Type == null)
{
AddError(ErrorCode.InvalidRelationshipEndType, EdmSchemaErrorSeverity.Error,
System.Data.Entity.Strings.InvalidRelationshipEndType(ParentElement.Name, element.FQName));
}
}
}
internal override void Validate()
{
base.Validate();
// Check if the end has multiplicity as many, it cannot have any operation behaviour
if (Multiplicity == RelationshipMultiplicity.Many && Operations.Count != 0)
{
AddError(ErrorCode.EndWithManyMultiplicityCannotHaveOperationsSpecified,
EdmSchemaErrorSeverity.Error,
System.Data.Entity.Strings.EndWithManyMultiplicityCannotHaveOperationsSpecified(this.Name, ParentElement.FQName));
}
// if there is no RefConstraint in Association and multiplicity is null
if (this.ParentElement.Constraints.Count == 0 && Multiplicity == null)
{
AddError(ErrorCode.EndWithoutMultiplicity,
EdmSchemaErrorSeverity.Error,
System.Data.Entity.Strings.EndWithoutMultiplicity(this.Name, ParentElement.FQName));
}
}
/// <summary>
/// Do simple validation across attributes
/// </summary>
protected override void HandleAttributesComplete()
{
// set up the default name in before validating anythig that might want to display it in an error message;
if (Name == null && _unresolvedType != null)
Name = Utils.ExtractTypeName(Schema.DataModel, _unresolvedType);
base.HandleAttributesComplete();
}
protected override bool ProhibitAttribute(string namespaceUri, string localName)
{
if (base.ProhibitAttribute(namespaceUri, localName))
{
return true;
}
if (namespaceUri == null && localName == XmlConstants.Name)
{
return false;
}
return false;
}
protected override bool HandleAttribute(XmlReader reader)
{
if (base.HandleAttribute(reader))
{
return true;
}
else if (CanHandleAttribute(reader, XmlConstants.Multiplicity))
{
HandleMultiplicityAttribute(reader);
return true;
}
else if (CanHandleAttribute(reader, XmlConstants.Role))
{
HandleNameAttribute(reader);
return true;
}
else if (CanHandleAttribute(reader, XmlConstants.TypeElement))
{
HandleTypeAttribute(reader);
return true;
}
return false;
}
protected override bool HandleElement(XmlReader reader)
{
if (base.HandleElement(reader))
{
return true;
}
else if (CanHandleElement(reader, XmlConstants.OnDelete))
{
HandleOnDeleteElement(reader);
return true;
}
return false;
}
/// <summary>
/// Handle the Type attribute
/// </summary>
/// <param name="reader">reader positioned at Type attribute</param>
private void HandleTypeAttribute(XmlReader reader)
{
Debug.Assert(reader != null);
string type;
if (!Utils.GetDottedName(this.Schema, reader, out type))
return;
_unresolvedType = type;
}
/// <summary>
/// Handle the Multiplicity attribute
/// </summary>
/// <param name="reader">reader positioned at Type attribute</param>
private void HandleMultiplicityAttribute(XmlReader reader)
{
Debug.Assert(reader != null);
RelationshipMultiplicity multiplicity;
if (!TryParseMultiplicity(reader.Value, out multiplicity))
{
AddError(ErrorCode.InvalidMultiplicity, EdmSchemaErrorSeverity.Error, reader, System.Data.Entity.Strings.InvalidRelationshipEndMultiplicity(ParentElement.Name, reader.Value));
}
_multiplicity = multiplicity;
}
/// <summary>
/// Handle an OnDelete element
/// </summary>
/// <param name="reader">reader positioned at the element</param>
private void HandleOnDeleteElement(XmlReader reader)
{
HandleOnOperationElement(reader, Operation.Delete);
}
/// <summary>
/// Handle an On<Operation> element
/// </summary>
/// <param name="reader">reader positioned at the element</param>
/// <param name="operation">the kind of operation being handled</param>
private void HandleOnOperationElement(XmlReader reader, Operation operation)
{
Debug.Assert(reader != null);
foreach (OnOperation other in Operations)
{
if (other.Operation == operation)
AddError(ErrorCode.InvalidOperation, EdmSchemaErrorSeverity.Error, reader, System.Data.Entity.Strings.DuplicationOperation(reader.Name));
}
OnOperation onOperation = new OnOperation(this, operation);
onOperation.Parse(reader);
_operations.Add(onOperation);
}
/// <summary>
/// The parent element as an IRelationship
/// </summary>
internal new IRelationship ParentElement
{
get
{
return (IRelationship)(base.ParentElement);
}
}
/// <summary>
/// Create a new Multiplicity object from a string
/// </summary>
/// <param name="value">string containing Multiplicity definition</param>
/// <param name="multiplicity">new multiplicity object (null if there were errors)</param>
/// <returns>try if the string was parsable, false otherwise</returns>
private static bool TryParseMultiplicity(string value, out RelationshipMultiplicity multiplicity)
{
switch (value)
{
case "0..1":
multiplicity = RelationshipMultiplicity.ZeroOrOne;
return true;
case "1":
multiplicity = RelationshipMultiplicity.One;
return true;
case "*":
multiplicity = RelationshipMultiplicity.Many;
return true;
default:
multiplicity = (RelationshipMultiplicity)(- 1);
return false;
}
}
}
}
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