// public static methods
public static ExecutableQuery <TDocument, int> Translate <TDocument>(MongoQueryProvider <TDocument> provider, TranslationContext context, MethodCallExpression expression)
{
var method = expression.Method;
var arguments = expression.Arguments;
if (method.IsOneOf(__countMethods))
{
var sourceExpression = arguments[0];
var pipeline = ExpressionToPipelineTranslator.Translate(context, sourceExpression);
if (method.IsOneOf(__countWithPredicateMethods))
{
var predicateLambda = ExpressionHelper.UnquoteLambda(arguments[1]);
var predicateFilter = ExpressionToFilterTranslator.TranslateLambda(context, predicateLambda, parameterSerializer: pipeline.OutputSerializer);
pipeline = pipeline.AddStages(
pipeline.OutputSerializer,
AstStage.Match(predicateFilter));
}
pipeline = pipeline.AddStages(
__wrappedInt32Serializer,
AstStage.Count("_v"));
return(ExecutableQuery.Create(
provider.Collection,
provider.Options,
pipeline,
_finalizer));
}
throw new ExpressionNotSupportedException(expression);
}
// public static methods
public static ExecutableQuery <TDocument, bool> Translate <TDocument>(MongoQueryProvider <TDocument> provider, TranslationContext context, MethodCallExpression expression)
{
var method = expression.Method;
var arguments = expression.Arguments;
if (method.Is(QueryableMethod.All))
{
var sourceExpression = arguments[0];
var pipeline = ExpressionToPipelineTranslator.Translate(context, sourceExpression);
var predicateLambda = ExpressionHelper.UnquoteLambda(arguments[1]);
var predicateFilter = ExpressionToFilterTranslator.TranslateLambda(context, predicateLambda, parameterSerializer: pipeline.OutputSerializer);
pipeline = pipeline.AddStages(
__outputSerializer,
AstStage.Match(AstFilter.Not(predicateFilter)),
AstStage.Limit(1),
AstStage.Project(
AstProject.ExcludeId(),
AstProject.Set("_v", BsonNull.Value)));
return(ExecutableQuery.Create(
provider.Collection,
provider.Options,
pipeline,
__finalizer));
}
throw new ExpressionNotSupportedException(expression);
}
// public static methods
public static AstPipeline Translate(TranslationContext context, MethodCallExpression expression)
{
var method = expression.Method;
var arguments = expression.Arguments;
if (method.Is(QueryableMethod.Where))
{
var sourceExpression = arguments[0];
var pipeline = ExpressionToPipelineTranslator.Translate(context, sourceExpression);
var predicateLambda = ExpressionHelper.UnquoteLambda(arguments[1]);
var predicateFilter = ExpressionToFilterTranslator.TranslateLambda(context, predicateLambda, parameterSerializer: pipeline.OutputSerializer);
pipeline = pipeline.AddStages(
pipeline.OutputSerializer,
AstStage.Match(predicateFilter));
return(pipeline);
}
throw new ExpressionNotSupportedException(expression);
}
// public methods
public static ExecutableQuery <TDocument, TOutput> Translate <TDocument>(MongoQueryProvider <TDocument> provider, TranslationContext context, MethodCallExpression expression)
{
var method = expression.Method;
var arguments = expression.Arguments;
if (method.IsOneOf(__lastMethods))
{
var sourceExpression = arguments[0];
var pipeline = ExpressionToPipelineTranslator.Translate(context, sourceExpression);
if (method.IsOneOf(__lastWithPredicateMethods))
{
var predicateLambda = ExpressionHelper.UnquoteLambda(arguments[1]);
var predicateFilter = ExpressionToFilterTranslator.TranslateLambda(context, predicateLambda, parameterSerializer: pipeline.OutputSerializer);
pipeline = pipeline.AddStages(
pipeline.OutputSerializer,
AstStage.Match(predicateFilter));
}
pipeline = pipeline.AddStages(
pipeline.OutputSerializer,
AstStage.Group(
id: BsonNull.Value,
fields: AstExpression.AccumulatorField("_last", AstAccumulatorOperator.Last, AstExpression.Var("ROOT"))));
var finalizer = method.Name == "LastOrDefault" ? __singleOrDefaultFinalizer : __singleFinalizer;
return(ExecutableQuery.Create(
provider.Collection,
provider.Options,
pipeline,
finalizer));
}
throw new ExpressionNotSupportedException(expression);
}