/// <summary>Constrctor with subject passed.</summary>
/// <param name="subject">Subject of this query.</param>
internal Query(Identifier subject)
: base()
{
_queryForm = QueryForms.Select;
ObservableCollection<Prefix> prefixes = new ObservableCollection<Prefix>();
prefixes.CollectionChanged += OnCollectionChanged;
_prefixes = prefixes;
ObservableCollection<ISelectableQueryComponent> select = new ObservableCollection<ISelectableQueryComponent>();
select.CollectionChanged += OnCollectionChanged;
_select = select;
ObservableCollection<QueryElement> elements = new ObservableCollection<QueryElement>();
elements.CollectionChanged += OnCollectionChanged;
_elements = elements;
_variableNamingStrategy = new UniqueVariableNamingStrategy(this);
_variableNamingConvention = new CamelCaseVariableNamingConvention();
if ((_subject = subject) != null)
{
_subject.OwnerQuery = this;
}
}
/// <summary>Visit a identifier.</summary>
/// <param name="identifier">Identifier to be visited.</param>
protected override void VisitIdentifier(Identifier identifier)
{
_commandText.AppendFormat("?{0}", (_variableNameOverride.ContainsKey(identifier) ? _variableNameOverride[identifier] : identifier.Name));
}
/// <summary>Default constructor with aboutness and its source passed.</summary>
/// <param name="about">Specifies an entity identifier given accesor uses.</param>
/// <param name="sourceExpression">Source of this entity accessor.</param>
/// <param name="entityAccessor">Strong entity accessor.</param>
internal UnspecifiedEntityAccessor(Identifier about, Remotion.Linq.Clauses.FromClauseBase sourceExpression, StrongEntityAccessor entityAccessor)
: base(about, sourceExpression)
{
_entityAccessor = entityAccessor;
}
/// <summary>Default constructor with aboutness assuming that a source is a variable.</summary>
/// <param name="about">Points to the primary topic of given entity accessor.</param>
/// <param name="entityAccessor">Strong entity accessor.</param>
internal UnspecifiedEntityAccessor(Identifier about, StrongEntityAccessor entityAccessor)
: base(about)
{
_entityAccessor = entityAccessor;
}
/// <summary>Constructor with subject and variable naming strategy passed.</summary>
/// <param name="subject">Subject of this query.</param>
/// <param name="variableNamingStrategy">Varialbe naming strategy.</param>
internal Query(Identifier subject, IVariableNamingStrategy variableNamingStrategy)
: this(subject)
{
_variableNamingStrategy = variableNamingStrategy;
_variableNamingConvention = new CamelCaseVariableNamingConvention();
}
/// <summary>Visit a identifier.</summary> /// <param name="identifier">Identifier to be visited.</param> protected abstract void VisitIdentifier(Identifier identifier);
/// <summary>Creates a new blank query that can act as a sub query for this instance.</summary>
/// <param name="subject">Primary subject of the resulting query.</param>
/// <remarks>This method doesn't add the resulting query as a sub query of this instance.</remarks>
/// <returns>Query that can act as a sub query for this instance.</returns>
public Query CreateSubQuery(Identifier subject)
{
Query result = new Query(subject, _variableNamingStrategy);
result.OwnerQuery = this;
return result;
}
/// <summary>Base constructor with component and alias passed.</summary>
/// <param name="component">Component to be aliased.</param>
/// <param name="name">Alias.</param>
public Alias(IQueryComponent component, Identifier name)
: base()
{
_component = component;
_name = name;
}
/// <summary>Visits a select clause.</summary>
/// <param name="selectClause">Select clause to be visited.</param>
/// <param name="queryModel">Query model containing given select clause.</param>
public override void VisitSelectClause(SelectClause selectClause, Remotion.Linq.QueryModel queryModel)
{
QuerySourceReferenceExpression querySource = FindQuerySource(selectClause.Selector);
_visitor.VisitExpression(selectClause.Selector);
QueryComponent component = _visitor.RetrieveComponent();
_query = _visitor.Query;
_mainFromComponent = _query.FindAllComponents<StrongEntityAccessor>().Where(item => item.SourceExpression == querySource.ReferencedQuerySource).First();
if (_query.Subject == null)
{
_query.Subject = _mainFromComponent.About;
UnboundConstrain genericConstrain = new UnboundConstrain(new Identifier("s"), new Identifier("p"), new Identifier("o"), _mainFromComponent.SourceExpression.FromExpression);
_mainFromComponent.Elements.Insert(0, genericConstrain);
_query.Select.Add(genericConstrain);
}
_subject = _query.Subject;
queryModel.MainFromClause.Accept(this, queryModel);
_query.Select.Add(_mainFromComponent);
VisitBodyClauses(queryModel.BodyClauses, queryModel);
VisitResultOperators(queryModel.ResultOperators, queryModel);
OverrideSelector(component, selectClause.Selector);
}
internal EntityQueryModelVisitor(Query query, IEntityContext context)
{
_entityContext = context;
_visitor = new EntityQueryVisitor(_query = (Query)(_result = query), _entityContext);
_subject = null;
}
private void OverrideEntitySelector(Identifier identifier)
{
UnboundConstrain genericConstrain = new UnboundConstrain(identifier, new Identifier(identifier.Name + "P"), new Identifier(identifier.Name + "O"), _mainFromComponent.SourceExpression.FromExpression);
_mainFromComponent.Elements.Add(genericConstrain);
_query.Select.Clear();
_query.Select.Add(genericConstrain);
UnspecifiedEntityAccessor entityAccessor = new UnspecifiedEntityAccessor(identifier, _mainFromComponent);
entityAccessor.Elements.Add(genericConstrain);
_query.Select.Add(entityAccessor);
int indexOf = -1;
if ((indexOf = _query.Elements.IndexOf(_mainFromComponent)) != -1)
{
_query.Elements.RemoveAt(indexOf);
_query.Elements.Insert(indexOf, entityAccessor);
}
else
{
_query.Elements.Add(entityAccessor);
}
if (_mainFromComponent.Elements[0] is UnboundConstrain)
{
_mainFromComponent.Elements.RemoveAt(0);
}
}
/// <summary>Visits an additional from clause.</summary>
/// <param name="fromClause">From clause to be visited.</param>
/// <param name="queryModel">Query model containing given from clause.</param>
/// <param name="index">Index of the where clause in the query model.</param>
public override void VisitAdditionalFromClause(AdditionalFromClause fromClause, QueryModel queryModel, int index)
{
VisitQuerableFromClause(fromClause, queryModel, index);
StrongEntityAccessor entityAccessor = (fromClause.FromExpression is System.Linq.Expressions.ConstantExpression ? null : _visitor.GetEntityAccessor(fromClause));
if (entityAccessor != null)
{
if ((entityAccessor.OwnerQuery == null) && (!_query.Elements.Contains(entityAccessor)))
{
_query.Elements.Add(entityAccessor);
}
}
else
{
NonEntityQueryModelVisitor modelVisitor = new NonEntityQueryModelVisitor(_visitor);
modelVisitor.VisitAdditionalFromClause(fromClause, queryModel, index);
if (modelVisitor.From is Identifier)
{
_subject = (Identifier)modelVisitor.From;
}
else if (modelVisitor.From is IExpression)
{
_auxFromComponent = (IExpression)modelVisitor.From;
}
}
base.VisitAdditionalFromClause(fromClause, queryModel, index);
}
