public virtual Expression CreateScope(
[NotNull] Expression expression,
[NotNull] Type elementType,
[NotNull] IQuerySource querySource)
{
Check.NotNull(expression, nameof(expression));
Check.NotNull(elementType, nameof(elementType));
Check.NotNull(querySource, nameof(querySource));
var innerItemParameter = Expression.Parameter(elementType);
return
(Expression.Call(
LinqOperatorProvider.Select
.MakeGenericMethod(elementType, typeof(QueryResultScope)),
expression,
Expression.Lambda(
QueryResultScope
.Create(querySource, innerItemParameter, QueryResultScopeParameter),
innerItemParameter)));
}
public override void VisitGroupJoinClause(
[NotNull] GroupJoinClause groupJoinClause, [NotNull] QueryModel queryModel, int index)
{
Check.NotNull(groupJoinClause, nameof(groupJoinClause));
Check.NotNull(queryModel, nameof(queryModel));
var outerKeySelector
= ReplaceClauseReferences(groupJoinClause.JoinClause.OuterKeySelector, groupJoinClause);
var innerExpression
= CompileGroupJoinInnerSequenceExpression(groupJoinClause, queryModel);
var innerSequenceType
= innerExpression.Type.GetSequenceType();
var innerItemParameter
= Expression.Parameter(innerSequenceType);
var innerElementScoped
= innerSequenceType.IsConstructedGenericType &&
innerSequenceType.GetGenericTypeDefinition() == typeof(QueryResultScope <>);
Type innerElementType;
var querySourceMapping = _queryCompilationContext.QuerySourceMapping;
if (innerElementScoped)
{
innerElementType = innerSequenceType.GetTypeInfo().GenericTypeArguments[0];
querySourceMapping.AddMapping(
groupJoinClause.JoinClause,
QueryResultScope.GetResult(innerItemParameter, groupJoinClause.JoinClause, innerElementType));
}
else
{
innerElementType = innerSequenceType;
querySourceMapping.AddMapping(groupJoinClause.JoinClause, innerItemParameter);
}
var innerKeySelector
= ReplaceClauseReferences(groupJoinClause.JoinClause.InnerKeySelector, groupJoinClause);
var innerItemsParameter
= Expression.Parameter(innerExpression.Type);
_expression
= Expression.Call(
LinqOperatorProvider.GroupJoin.MakeGenericMethod(
typeof(QueryResultScope),
innerSequenceType,
outerKeySelector.Type,
typeof(QueryResultScope)),
_expression,
innerExpression,
Expression.Lambda(outerKeySelector, QueryResultScopeParameter),
Expression.Lambda(innerKeySelector, innerItemParameter),
Expression.Lambda(
QueryResultScope
.Create(
groupJoinClause,
innerElementScoped
? Expression.Call(
LinqOperatorProvider.Select
.MakeGenericMethod(
innerSequenceType,
innerElementType),
innerItemsParameter,
Expression.Lambda(
QueryResultScope.GetResult(
innerItemParameter,
groupJoinClause.JoinClause,
innerElementType),
innerItemParameter))
: (Expression)innerItemsParameter,
QueryResultScopeParameter),
QueryResultScopeParameter, innerItemsParameter));
var expressionTypeInfo = _expression.Type.GetTypeInfo();
querySourceMapping.AddMapping(
groupJoinClause,
QueryResultScope
.GetResult(
QueryResultScopeParameter,
groupJoinClause,
expressionTypeInfo.GetGenericTypeDefinition()
.MakeGenericType(innerElementType)));
}
