public static AstFilter Translate(TranslationContext context, MethodCallExpression expression)
{
if (AllWithContainsInPredicateMethodToFilterTranslator.CanTranslate(expression, out var arrayFieldExpression, out var arrayConstantExpression))
{
return(AllWithContainsInPredicateMethodToFilterTranslator.Translate(context, arrayFieldExpression, arrayConstantExpression));
}
if (AnyWithContainsInPredicateMethodToFilterTranslator.CanTranslate(expression, out arrayFieldExpression, out arrayConstantExpression))
{
return(AnyWithContainsInPredicateMethodToFilterTranslator.Translate(context, arrayFieldExpression, arrayConstantExpression));
}
var method = expression.Method;
var arguments = expression.Arguments;
if (method.IsOneOf(EnumerableMethod.All, EnumerableMethod.Any, EnumerableMethod.AnyWithPredicate))
{
var sourceExpression = arguments[0];
var(field, filter) = FilteredEnumerableFilterFieldTranslator.Translate(context, sourceExpression);
if (method.IsOneOf(EnumerableMethod.All, EnumerableMethod.AnyWithPredicate))
{
var predicateLambda = (LambdaExpression)arguments[1];
var parameterExpression = predicateLambda.Parameters.Single();
var elementSerializer = ArraySerializerHelper.GetItemSerializer(field.Serializer);
var parameterSymbol = context.CreateSymbol(parameterExpression, "@<elem>", elementSerializer); // @<elem> represents the implied element
var predicateContext = context.WithSingleSymbol(parameterSymbol); // @<elem> is the only symbol visible inside an $elemMatch
var predicateFilter = ExpressionToFilterTranslator.Translate(predicateContext, predicateLambda.Body, exprOk: false);
filter = AstFilter.Combine(filter, predicateFilter);
}
if (method.Is(EnumerableMethod.All))
{
return(AstFilter.Not(AstFilter.ElemMatch(field, AstFilter.Not(filter))));
}
else
{
if (filter == null)
{
return(AstFilter.And(AstFilter.Ne(field, BsonNull.Value), AstFilter.Not(AstFilter.Size(field, 0))));
}
else
{
return(AstFilter.ElemMatch(field, filter));
}
}
}
throw new ExpressionNotSupportedException(expression);
}
public static AstFilter Translate(TranslationContext context, MemberExpression expression)
{
var memberInfo = expression.Member;
if (memberInfo is PropertyInfo propertyInfo)
{
if (propertyInfo.Is(NullableProperty.HasValue))
{
var fieldExpression = expression.Expression;
var field = ExpressionToFilterFieldTranslator.Translate(context, fieldExpression);
return(AstFilter.Ne(field, BsonNull.Value));
}
if (propertyInfo.PropertyType == typeof(bool))
{
var field = ExpressionToFilterFieldTranslator.Translate(context, expression);
return(AstFilter.Eq(field, true));
}
}
throw new ExpressionNotSupportedException(expression);
}
private static AstFilter TranslateComparisonToBooleanConstant(TranslationContext context, Expression expression, Expression leftExpression, AstComparisonFilterOperator comparisonOperator, bool comparand)
{
var filter = ExpressionToFilterTranslator.Translate(context, leftExpression);
if (filter is AstFieldOperationFilter fieldOperationFilter &&
fieldOperationFilter.Operation is AstComparisonFilterOperation comparisonOperation &&
comparisonOperation.Operator == AstComparisonFilterOperator.Eq &&
comparisonOperation.Value == true)
{
var field = fieldOperationFilter.Field;
switch (comparisonOperator)
{
case AstComparisonFilterOperator.Eq:
return(AstFilter.Eq(field, comparand));
case AstComparisonFilterOperator.Ne:
return(AstFilter.Ne(field, comparand));
default:
throw new ExpressionNotSupportedException(expression);
}
}