// TODO: Debugging
private void VerifySelectExpression(ProjectionBindingExpression projectionBindingExpression)
{
if (projectionBindingExpression.QueryExpression != _selectExpression)
{
throw new InvalidOperationException(CoreStrings.QueryFailed(projectionBindingExpression.Print(), GetType().Name));
}
}
// TODO: Debugging
private void VerifyQueryExpression(ProjectionBindingExpression projectionBindingExpression)
{
if (projectionBindingExpression.QueryExpression != _queryExpression)
{
throw new InvalidOperationException();
}
}
private object GetProjectionIndex(ProjectionBindingExpression projectionBindingExpression)
{
return(projectionBindingExpression.ProjectionMember != null
? ((ConstantExpression)_selectExpression.GetProjectionExpression(projectionBindingExpression.ProjectionMember)).Value
: (projectionBindingExpression.Index != null
? (object)projectionBindingExpression.Index
: projectionBindingExpression.IndexMap));
}
private object GetProjectionIndex(ProjectionBindingExpression projectionBindingExpression)
{
return(projectionBindingExpression.ProjectionMember != null
? ((ConstantExpression)_selectExpression.GetMappedProjection(projectionBindingExpression.ProjectionMember)).Value
: (projectionBindingExpression.Index != null
? projectionBindingExpression.Index
: throw new InvalidOperationException()));
}
protected override Expression VisitExtension(Expression extensionExpression)
{
return(extensionExpression switch
{
ProjectionBindingExpression projectionBindingExpression => Remap(projectionBindingExpression),
CollectionShaperExpression collectionShaperExpression => Remap(collectionShaperExpression),
_ => base.VisitExtension(extensionExpression)
});
private ShapedQueryExpression AggregateResultShaper(
ShapedQueryExpression source, Expression projection, bool throwOnNullResult, Type resultType)
{
var selectExpression = (SelectExpression)source.QueryExpression;
selectExpression.ReplaceProjectionMapping(
new Dictionary <ProjectionMember, Expression>
{
{ new ProjectionMember(), projection }
});
selectExpression.ClearOrdering();
Expression shaper = new ProjectionBindingExpression(source.QueryExpression, new ProjectionMember(), projection.Type);
if (throwOnNullResult &&
resultType.IsNullableType())
{
var resultVariable = Expression.Variable(projection.Type, "result");
shaper = Expression.Block(
new[] { resultVariable },
Expression.Assign(resultVariable, shaper),
Expression.Condition(
Expression.Equal(resultVariable, Expression.Default(projection.Type)),
Expression.Constant(null, resultType),
resultType != resultVariable.Type
? Expression.Convert(resultVariable, resultType)
: (Expression)resultVariable));
}
else if (throwOnNullResult)
{
var resultVariable = Expression.Variable(projection.Type, "result");
shaper = Expression.Block(
new[] { resultVariable },
Expression.Assign(resultVariable, shaper),
Expression.Condition(
Expression.Equal(resultVariable, Expression.Default(projection.Type)),
Expression.Throw(
Expression.New(
typeof(InvalidOperationException).GetConstructors()
.Single(ci => ci.GetParameters().Length == 1),
Expression.Constant(CoreStrings.NoElements)),
resultType),
resultType != resultVariable.Type
? Expression.Convert(resultVariable, resultType)
: (Expression)resultVariable));
}
else if (resultType.IsNullableType())
{
shaper = Expression.Convert(shaper, resultType);
}
source.ShaperExpression = shaper;
return(source);
}
private ShapedQueryExpression AggregateResultShaper(
ShapedQueryExpression source, Expression projection, bool throwWhenEmpty, Type resultType)
{
var selectExpression = (SelectExpression)source.QueryExpression;
selectExpression.ReplaceProjectionMapping(
new Dictionary <ProjectionMember, Expression> {
{ new ProjectionMember(), projection }
});
selectExpression.ClearOrdering();
Expression shaper;
if (throwWhenEmpty)
{
// Avg/Max/Min case.
// We always read nullable value
// If resultType is nullable then we always return null. Only non-null result shows throwing behavior.
// otherwise, if projection.Type is nullable then server result is passed through DefaultIfEmpty, hence we return default
// otherwise, server would return null only if it is empty, and we throw
var nullableResultType = resultType.MakeNullable();
shaper = new ProjectionBindingExpression(source.QueryExpression, new ProjectionMember(), nullableResultType);
var resultVariable = Expression.Variable(nullableResultType, "result");
var returnValueForNull = resultType.IsNullableType()
? Expression.Constant(null, resultType)
: projection.Type.IsNullableType()
? (Expression)Expression.Default(resultType)
: Expression.Throw(
Expression.New(
typeof(InvalidOperationException).GetConstructors()
.Single(ci => ci.GetParameters().Length == 1),
Expression.Constant(CoreStrings.NoElements)),
resultType);
shaper = Expression.Block(
new[] { resultVariable },
Expression.Assign(resultVariable, shaper),
Expression.Condition(
Expression.Equal(resultVariable, Expression.Default(nullableResultType)),
returnValueForNull,
resultType != resultVariable.Type
? Expression.Convert(resultVariable, resultType)
: (Expression)resultVariable));
}
else
{
// Sum case. Projection is always non-null. We read non-nullable value (0 if empty)
shaper = new ProjectionBindingExpression(source.QueryExpression, new ProjectionMember(), projection.Type);
// Cast to nullable type if required
if (resultType != shaper.Type)
{
shaper = Expression.Convert(shaper, resultType);
}
}
return(source.UpdateShaperExpression(shaper));
}
private object GetProjectionIndex(
InMemoryQueryExpression queryExpression, ProjectionBindingExpression projectionBindingExpression)
{
return(projectionBindingExpression.ProjectionMember != null
? ((ConstantExpression)queryExpression.GetMappedProjection(projectionBindingExpression.ProjectionMember)).Value
: (projectionBindingExpression.Index != null
? (object)projectionBindingExpression.Index
: projectionBindingExpression.IndexMap));
}
/// <summary>
/// Creates a new instance of the <see cref="CollectionResultExpression" /> class.
/// </summary>
/// <param name="projectionBindingExpression">An expression reprensenting how to get the subquery from SelectExpression to get the elements.</param>
/// <param name="navigation">A navigation associated with this collection, if any.</param>
/// <param name="elementType">The clr type of individual elements in the collection.</param>
public CollectionResultExpression(
ProjectionBindingExpression projectionBindingExpression,
INavigationBase?navigation,
Type elementType)
{
ProjectionBindingExpression = projectionBindingExpression;
Navigation = navigation;
ElementType = elementType;
}
public ProjectionBindingExpression AddToProjection(SqlExpression sqlExpression, Type type)
{
if (!_projectionCache.TryGetValue(sqlExpression, out var result))
{
_projection.Add(new ProjectionExpression(sqlExpression, alias: ""));
result = new ProjectionBindingExpression(this, _projection.Count - 1, type);
_projectionCache[sqlExpression] = result;
}
return(result);
}
public ProjectionBindingExpression AddToProjection(ProjectionBindingExpression projectionBindingExpression)
{
var entityProjection = (EntityProjectionExpression)_projectionMapping[projectionBindingExpression.ProjectionMember];
var index = _projection.Count;
foreach (var property in entityProjection.EntityType.GetProperties())
{
var columnExpression = entityProjection.GetProperty(property);
_projection.Add(new ProjectionExpression(columnExpression, alias: ""));
}
return(new ProjectionBindingExpression(this, index, typeof(ValueBuffer)));
}
public ProjectionBindingExpression AddToProjection(ProjectionBindingExpression projectionBindingExpression)
{
var entityProjection = (EntityProjectionExpression)_projectionMapping[projectionBindingExpression.ProjectionMember];
if (!_projectionCache.TryGetValue(entityProjection, out var result))
{
var map = new Dictionary <IProperty, int>();
foreach (var property in entityProjection.EntityType
.GetDerivedTypesInclusive().SelectMany(e => e.GetDeclaredProperties()))
{
var columnExpression = entityProjection.GetProperty(property);
map[property] = _projection.Count;
_projection.Add(new ProjectionExpression(columnExpression, alias: ""));
}
result = new ProjectionBindingExpression(this, map);
_projectionCache[entityProjection] = result;
}
return(result);
}
private Expression GenerateKey(ProjectionBindingExpression projectionBindingExpression)
=> projectionBindingExpression.ProjectionMember != null
? _selectExpression.GetMappedProjection(projectionBindingExpression.ProjectionMember)
: projectionBindingExpression;
protected override ProjectionExpression GetProjection(ProjectionBindingExpression _) => _readItemExpression.ProjectionExpression;
private int GetProjectionIndex(ProjectionBindingExpression projectionBindingExpression)
{
return(projectionBindingExpression.ProjectionMember != null
? (int)((ConstantExpression)_selectExpression.GetProjectionExpression(projectionBindingExpression.ProjectionMember)).Value
: projectionBindingExpression.Index);
}
private ProjectionExpression GetProjection(ProjectionBindingExpression projectionBindingExpression)
{
var index = GetProjectionIndex(projectionBindingExpression);
return(_selectExpression.Projection[index]);
}
private int GetProjectionIndex(ProjectionBindingExpression projectionBindingExpression)
=> projectionBindingExpression.ProjectionMember != null
? (int)((ConstantExpression)_selectExpression.GetMappedProjection(projectionBindingExpression.ProjectionMember)).Value
: projectionBindingExpression.Index
?? throw new InvalidOperationException(CoreStrings.QueryFailed(projectionBindingExpression.Print(), GetType().Name));
private int GetProjectionIndex(ProjectionBindingExpression projectionBindingExpression)
=> projectionBindingExpression.ProjectionMember != null
? _selectExpression.GetMappedProjection(projectionBindingExpression.ProjectionMember).GetConstantValue <int>()
: projectionBindingExpression.Index
?? throw new InvalidOperationException(CoreStrings.TranslationFailed(projectionBindingExpression.Print()));
private int GetProjectionIndex(ProjectionBindingExpression projectionBindingExpression)
=> projectionBindingExpression.ProjectionMember != null
? _selectExpression.GetMappedProjection(projectionBindingExpression.ProjectionMember).GetConstantValue <int>()
: (projectionBindingExpression.Index
/// <summary>
/// Creates a new expression that is like this one, but using the supplied children. If all of the children are the same, it will
/// return this expression.
/// </summary>
/// <param name="projectionBindingExpression">The <see cref="ProjectionBindingExpression" /> property of the result.</param>
/// <returns>This expression if no children changed, or an expression with the updated children.</returns>
public virtual CollectionResultExpression Update(ProjectionBindingExpression projectionBindingExpression)
=> projectionBindingExpression != ProjectionBindingExpression
? new CollectionResultExpression(projectionBindingExpression, Navigation, ElementType)
: this;
private int GetProjectionIndex(ProjectionBindingExpression projectionBindingExpression)
=> projectionBindingExpression.ProjectionMember != null
? (int)((ConstantExpression)_selectExpression.GetMappedProjection(projectionBindingExpression.ProjectionMember)).Value
: projectionBindingExpression.Index ?? throw new InvalidOperationException();
public SqlExpression BindNavigation(INavigation navigation, ProjectionBindingExpression projectionBindingExpression) => ((EntityProjectionExpression)_projectionMapping[projectionBindingExpression.ProjectionMember]) .GetNavigation(navigation);
private Expression GenerateKey(ProjectionBindingExpression projectionBindingExpression)
=> _queryExpression != null &&
projectionBindingExpression.ProjectionMember != null
? _queryExpression.GetMappedProjection(projectionBindingExpression.ProjectionMember)
: projectionBindingExpression;
public SqlExpression BindProperty(IProperty property, ProjectionBindingExpression projectionBindingExpression) => ((EntityProjectionExpression)_projectionMapping[projectionBindingExpression.ProjectionMember]) .GetProperty(property);
protected override ProjectionExpression GetProjection(ProjectionBindingExpression projectionBindingExpression) => _selectExpression.Projection[GetProjectionIndex(projectionBindingExpression)];
private object GetProjectionIndex(ProjectionBindingExpression projectionBindingExpression)
=> projectionBindingExpression.ProjectionMember != null
? ((ConstantExpression)_selectExpression.GetMappedProjection(projectionBindingExpression.ProjectionMember)).Value
: (projectionBindingExpression.Index != null
public SqlExpression BindProperty(ProjectionBindingExpression projectionBindingExpression, IProperty property)
{
return(((EntityProjectionExpression)_projectionMapping[projectionBindingExpression.ProjectionMember])
.GetProperty(property));
}
private Expression GenerateKey(ProjectionBindingExpression projectionBindingExpression)
{
return(projectionBindingExpression.ProjectionMember != null
? _selectExpression.GetProjectionExpression(projectionBindingExpression.ProjectionMember)
: projectionBindingExpression);
}
protected abstract ProjectionExpression GetProjection(ProjectionBindingExpression projectionBindingExpression);
