private (Expression operand, NavigationExpansionExpressionState state) ApplyIncludes(NavigationExpansionExpression navigationExpansionExpression)
{
var includeFinder = new PendingIncludeFindingVisitor();
includeFinder.Visit(navigationExpansionExpression.State.PendingSelector.Body);
var includeRewriter = new PendingSelectorIncludeRewriter();
var rewrittenBody = includeRewriter.Visit(navigationExpansionExpression.State.PendingSelector.Body);
if (navigationExpansionExpression.State.PendingSelector.Body != rewrittenBody)
{
navigationExpansionExpression.State.PendingSelector = Expression.Lambda(rewrittenBody, navigationExpansionExpression.State.PendingSelector.Parameters[0]);
navigationExpansionExpression.State.ApplyPendingSelector = true;
}
if (includeFinder.PendingIncludes.Count > 0)
{
var result = (source : navigationExpansionExpression.Operand, parameter : navigationExpansionExpression.State.CurrentParameter);
foreach (var pendingIncludeNode in includeFinder.PendingIncludes)
{
result = NavigationExpansionHelpers.AddNavigationJoin(
result.source,
result.parameter,
pendingIncludeNode.Value,
pendingIncludeNode.Key,
navigationExpansionExpression.State,
new List <INavigation>(),
include: true);
}
var pendingSelector = navigationExpansionExpression.State.PendingSelector;
if (navigationExpansionExpression.State.CurrentParameter != result.parameter)
{
var pendingSelectorBody = new ExpressionReplacingVisitor(navigationExpansionExpression.State.CurrentParameter, result.parameter).Visit(navigationExpansionExpression.State.PendingSelector.Body);
pendingSelector = Expression.Lambda(pendingSelectorBody, result.parameter);
}
var newState = new NavigationExpansionExpressionState(
result.parameter,
navigationExpansionExpression.State.SourceMappings,
pendingSelector,
applyPendingSelector: true,
navigationExpansionExpression.State.PendingOrderings,
navigationExpansionExpression.State.PendingIncludeChain,
navigationExpansionExpression.State.PendingCardinalityReducingOperator,
navigationExpansionExpression.State.PendingTags,
navigationExpansionExpression.State.CustomRootMappings,
navigationExpansionExpression.State.MaterializeCollectionNavigation);
return(operand : result.source, state : newState);
}
return(operand : navigationExpansionExpression.Operand, state : navigationExpansionExpression.State);
}
