public static AggregationExpression Translate(TranslationContext context, MethodCallExpression expression)
{
var method = expression.Method;
var arguments = expression.Arguments;
if (method.IsOneOf(EnumerableMethod.First, EnumerableMethod.FirstWithPredicate, EnumerableMethod.Last, EnumerableMethod.LastWithPredicate))
{
var sourceExpression = arguments[0];
var sourceTranslation = ExpressionToAggregationExpressionTranslator.TranslateEnumerable(context, sourceExpression);
var array = sourceTranslation.Ast;
var itemSerializer = ArraySerializerHelper.GetItemSerializer(sourceTranslation.Serializer);
if (method.IsOneOf(EnumerableMethod.FirstWithPredicate, EnumerableMethod.LastWithPredicate))
{
var predicateLambda = (LambdaExpression)arguments[1];
var predicateTranslation = ExpressionToAggregationExpressionTranslator.TranslateLambdaBody(context, predicateLambda, itemSerializer, asRoot: false);
var predicateParameter = predicateLambda.Parameters[0];
array = AstExpression.Filter(
input: array,
cond: predicateTranslation.Ast,
@as: predicateParameter.Name);
}
var ast = method.Name == "First" ? AstExpression.First(array) : AstExpression.Last(array);
return(new AggregationExpression(expression, ast, itemSerializer));
}
if (SetWindowFieldsMethodToAggregationExpressionTranslator.CanTranslate(expression))
{
return(SetWindowFieldsMethodToAggregationExpressionTranslator.Translate(context, expression));
}
throw new ExpressionNotSupportedException(expression);
}
public static AggregationExpression Translate(TranslationContext context, MethodCallExpression expression)
{
if (SetWindowFieldsMethodToAggregationExpressionTranslator.CanTranslate(expression))
{
return(SetWindowFieldsMethodToAggregationExpressionTranslator.Translate(context, expression));
}
throw new ExpressionNotSupportedException(expression);
}
public static AggregationExpression Translate(TranslationContext context, MethodCallExpression expression)
{
var method = expression.Method;
var arguments = expression.Arguments;
if (method.IsOneOf(__averageMethods))
{
var sourceExpression = arguments[0];
var sourceTranslation = ExpressionToAggregationExpressionTranslator.TranslateEnumerable(context, sourceExpression);
AstExpression ast;
if (method.IsOneOf(__averageWithSelectorMethods))
{
var selectorLambda = (LambdaExpression)arguments[1];
var selectorParameter = selectorLambda.Parameters[0];
var sourceItemSerializer = ArraySerializerHelper.GetItemSerializer(sourceTranslation.Serializer);
var selectorSymbol = context.CreateSymbol(selectorParameter, sourceItemSerializer);
var selectorContext = context.WithSymbol(selectorSymbol);
var selectorTranslation = ExpressionToAggregationExpressionTranslator.Translate(selectorContext, selectorLambda.Body);
ast = AstExpression.Avg(
AstExpression.Map(
input: sourceTranslation.Ast,
@as: selectorSymbol.Var,
@in: selectorTranslation.Ast));
}
else
{
ast = AstExpression.Avg(sourceTranslation.Ast);
}
IBsonSerializer serializer = expression.Type switch
{
Type t when t == typeof(int) => new Int32Serializer(),
Type t when t == typeof(long) => new Int64Serializer(),
Type t when t == typeof(float) => new SingleSerializer(),
Type t when t == typeof(double) => new DoubleSerializer(),
Type t when t == typeof(decimal) => new DecimalSerializer(),
Type {
IsConstructedGenericType : true
} t when t.GetGenericTypeDefinition() == typeof(Nullable <>) => (IBsonSerializer)Activator.CreateInstance(typeof(NullableSerializer <>).MakeGenericType(t.GenericTypeArguments[0])),
_ => throw new ExpressionNotSupportedException(expression)
};
return(new AggregationExpression(expression, ast, serializer));
}
if (SetWindowFieldsMethodToAggregationExpressionTranslator.CanTranslate(expression))
{
return(SetWindowFieldsMethodToAggregationExpressionTranslator.Translate(context, expression));
}
throw new ExpressionNotSupportedException(expression);
}
}
public static AggregationExpression Translate(TranslationContext context, MethodCallExpression expression)
{
var method = expression.Method;
var arguments = expression.Arguments;
if (method.IsOneOf(__countMethods))
{
var sourceExpression = arguments[0];
var sourceTranslation = ExpressionToAggregationExpressionTranslator.TranslateEnumerable(context, sourceExpression);
AstExpression ast;
if (method.IsOneOf(__countWithPredicateMethods))
{
if (sourceExpression.Type == typeof(string))
{
throw new ExpressionNotSupportedException(expression);
}
var predicateLambda = (LambdaExpression)arguments[1];
var sourceItemSerializer = ArraySerializerHelper.GetItemSerializer(sourceTranslation.Serializer);
var predicateTranslation = ExpressionToAggregationExpressionTranslator.TranslateLambdaBody(context, predicateLambda, sourceItemSerializer, asRoot: false);
var filteredSourceAst = AstExpression.Filter(
input: sourceTranslation.Ast,
cond: predicateTranslation.Ast,
@as: predicateLambda.Parameters[0].Name);
ast = AstExpression.Size(filteredSourceAst);
}
else
{
if (sourceExpression.Type == typeof(string))
{
ast = AstExpression.StrLenCP(sourceTranslation.Ast);
}
else
{
ast = AstExpression.Size(sourceTranslation.Ast);
}
}
var serializer = GetSerializer(expression.Type);
return(new AggregationExpression(expression, ast, serializer));
}
if (SetWindowFieldsMethodToAggregationExpressionTranslator.CanTranslate(expression))
{
return(SetWindowFieldsMethodToAggregationExpressionTranslator.Translate(context, expression));
}
throw new ExpressionNotSupportedException(expression);
}
public static AggregationExpression Translate(TranslationContext context, MethodCallExpression expression)
{
var method = expression.Method;
var arguments = expression.Arguments;
if (method.DeclaringType == typeof(Enumerable) && (method.Name == "Max" || method.Name == "Min"))
{
var sourceExpression = arguments[0];
var sourceTranslation = ExpressionToAggregationExpressionTranslator.TranslateEnumerable(context, sourceExpression);
AstExpression ast;
IBsonSerializer serializer;
if (arguments.Count == 1)
{
var array = sourceTranslation.Ast;
ast = method.Name == "Max" ? AstExpression.Max(array) : AstExpression.Min(array);
serializer = ArraySerializerHelper.GetItemSerializer(sourceTranslation.Serializer);
}
else
{
var selectorLambda = (LambdaExpression)arguments[1];
var selectorParameter = selectorLambda.Parameters[0];
var selectorParameterSerializer = ArraySerializerHelper.GetItemSerializer(sourceTranslation.Serializer);
var selectorParameterSymbol = context.CreateSymbol(selectorParameter, selectorParameterSerializer);
var selectorContext = context.WithSymbol(selectorParameterSymbol);
var selectorTranslation = ExpressionToAggregationExpressionTranslator.Translate(selectorContext, selectorLambda.Body);
var mappedArray =
AstExpression.Map(
input: sourceTranslation.Ast,
@as: selectorParameterSymbol.Var,
@in: selectorTranslation.Ast);
ast = method.Name == "Max" ? AstExpression.Max(mappedArray) : AstExpression.Min(mappedArray);
serializer = selectorTranslation.Serializer;
}
return(new AggregationExpression(expression, ast, serializer));
}
if (SetWindowFieldsMethodToAggregationExpressionTranslator.CanTranslate(expression))
{
return(SetWindowFieldsMethodToAggregationExpressionTranslator.Translate(context, expression));
}
throw new ExpressionNotSupportedException(expression);
}
public static AggregationExpression Translate(TranslationContext context, MethodCallExpression expression)
{
var method = expression.Method;
var arguments = expression.Arguments;
if (method.IsOneOf(__sumMethods))
{
var sourceExpression = arguments[0];
var sourceTranslation = ExpressionToAggregationExpressionTranslator.TranslateEnumerable(context, sourceExpression);
var sourceItemSerializer = ArraySerializerHelper.GetItemSerializer(sourceTranslation.Serializer);
AstExpression ast;
IBsonSerializer serializer;
if (arguments.Count == 1)
{
ast = AstExpression.Sum(sourceTranslation.Ast);
serializer = sourceItemSerializer;
}
else
{
var selectorLambda = (LambdaExpression)arguments[1];
var selectorParameter = selectorLambda.Parameters[0];
var selectorSymbol = context.CreateSymbol(selectorParameter, sourceItemSerializer);
var selectorContext = context.WithSymbol(selectorSymbol);
var selectorTranslation = ExpressionToAggregationExpressionTranslator.Translate(selectorContext, selectorLambda.Body);
ast = AstExpression.Sum(
AstExpression.Map(
input: sourceTranslation.Ast,
@as: selectorSymbol.Var,
@in: selectorTranslation.Ast));
serializer = selectorTranslation.Serializer;
}
return(new AggregationExpression(expression, ast, serializer));
}
if (SetWindowFieldsMethodToAggregationExpressionTranslator.CanTranslate(expression))
{
return(SetWindowFieldsMethodToAggregationExpressionTranslator.Translate(context, expression));
}
throw new ExpressionNotSupportedException(expression);
}
public static AggregationExpression Translate(TranslationContext context, MethodCallExpression expression)
{
var method = expression.Method;
var arguments = expression.Arguments;
if (IsStandardDeviationMethod(method, out var stddevOperator))
{
if (arguments.Count == 1 || arguments.Count == 2)
{
var sourceExpression = arguments[0];
var sourceTranslation = ExpressionToAggregationExpressionTranslator.TranslateEnumerable(context, sourceExpression);
if (arguments.Count == 2)
{
var selectorLambda = (LambdaExpression)arguments[1];
var selectorParameter = selectorLambda.Parameters[0];
var selectorParameterSerializer = ArraySerializerHelper.GetItemSerializer(sourceTranslation.Serializer);
var selectorParameterSymbol = context.CreateSymbol(selectorParameter, selectorParameterSerializer);
var selectorContext = context.WithSymbol(selectorParameterSymbol);
var selectorTranslation = ExpressionToAggregationExpressionTranslator.Translate(selectorContext, selectorLambda.Body);
var selectorAst = AstExpression.Map(
input: sourceTranslation.Ast,
@as: selectorParameterSymbol.Var,
@in: selectorTranslation.Ast);
var selectorResultSerializer = BsonSerializer.LookupSerializer(selectorLambda.ReturnType);
sourceTranslation = new AggregationExpression(selectorLambda, selectorAst, selectorResultSerializer);
}
var ast = AstExpression.StdDev(stddevOperator, sourceTranslation.Ast);
var serializer = BsonSerializer.LookupSerializer(expression.Type);
return(new AggregationExpression(expression, ast, serializer));
}
}
if (SetWindowFieldsMethodToAggregationExpressionTranslator.CanTranslate(expression))
{
return(SetWindowFieldsMethodToAggregationExpressionTranslator.Translate(context, expression));
}
throw new ExpressionNotSupportedException(expression);
}