private NhPartialEvaluatingExpressionVisitor(
PartialEvaluationInfo partialEvaluationInfo,
PreTransformationParameters preTransformationParameters)
{
_partialEvaluationInfo = partialEvaluationInfo;
_preTransformationParameters = preTransformationParameters;
}
private PartialEvaluatingExpressionTreeVisitor(Expression treeRoot, PartialEvaluationInfo partialEvaluationInfo)
{
ArgumentUtility.CheckNotNull("treeRoot", treeRoot);
ArgumentUtility.CheckNotNull("partialEvaluationInfo", partialEvaluationInfo);
_partialEvaluationInfo = partialEvaluationInfo;
}
private PartialEvaluatingExpressionVisitor(
PartialEvaluationInfo partialEvaluationInfo,
IEvaluatableExpressionFilter evaluatableExpressionFilter)
{
ArgumentUtility.CheckNotNull("partialEvaluationInfo", partialEvaluationInfo);
ArgumentUtility.CheckNotNull("evaluatableExpressionFilter", evaluatableExpressionFilter);
_partialEvaluationInfo = partialEvaluationInfo;
_evaluatableExpressionFilter = evaluatableExpressionFilter;
}
/// <summary>
/// This API supports the Entity Framework Core infrastructure and is not intended to be used
/// directly from your code. This API may change or be removed in future releases.
/// </summary>
public virtual Expression ExtractParameters([NotNull] Expression expression)
{
var oldPartialEvaluationInfo = _partialEvaluationInfo;
_partialEvaluationInfo
= EvaluatableTreeFindingExpressionVisitor
.Analyze(expression, _evaluatableExpressionFilter);
try
{
return(Visit(expression));
}
finally
{
_partialEvaluationInfo = oldPartialEvaluationInfo;
}
}
/// <remarks>
/// Parameters are evaluatable if they are supplied by evaluatable expression.
/// Look up lambda defining the parameter, up the ancestor list and check if method call to which it is passed is on evaluatable
/// instance or extension method accepting evaluatable arguments.
/// Note that lambda body is visited prior to parameters.
/// Since method call is visited in the order [instance, arguments] and extension methods get instance as first parameter
/// the source of the parameter is already visited and its evaluatability established.
/// </remarks>>
private ParameterStatus CalcParameterStatus(ParameterExpression expression)
{
if (expression == null)
{
throw new ArgumentNullException(nameof(expression));
}
var result = new ParameterStatus {
Expression = expression
};
foreach (var ancestor in _ancestors)
{
if (result.MethodArgumentAcceptingLambda == null && IsParameterOwner(ancestor, expression))
{
result.MethodArgumentAcceptingLambda = result.OwningExpression = (LambdaExpression)ancestor;
}
else if (result.MethodArgumentAcceptingLambda != null)
{
if (ancestor.NodeType == ExpressionType.Call)
{
result.MethodCallInvokingLambda = (MethodCallExpression)ancestor;
result.IsEvaluatable = result.MethodCallInvokingLambda.Object != null
? PartialEvaluationInfo.IsEvaluatableExpression(result.MethodCallInvokingLambda.Object)
: result.MethodCallInvokingLambda.Arguments.All(a => a == result.MethodArgumentAcceptingLambda || (
PartialEvaluationInfo.IsEvaluatableExpression(a)
// member expressions on e.g. repository creating query instances must be evaluated into constants
// but parameters accepting values from them are not evaluatable
&& !typeof(IQueryable).IsAssignableFrom(a.Type)));
return(result);
}
result.MethodArgumentAcceptingLambda = ancestor;
}
}
return(result);
}
private ParameterExtractingExpressionVisitor(
PartialEvaluationInfo partialEvaluationInfo, QueryContext queryContext)
{
_partialEvaluationInfo = partialEvaluationInfo;
_queryContext = queryContext;
}
private PartialEvaluatingExpressionTreeVisitor(Expression treeRoot, PartialEvaluationInfo partialEvaluationInfo)
{
_partialEvaluationInfo = partialEvaluationInfo;
}
private NhPartialEvaluatingExpressionVisitor(PartialEvaluationInfo partialEvaluationInfo)
{
_partialEvaluationInfo = partialEvaluationInfo ?? throw new ArgumentNullException(nameof(partialEvaluationInfo));
}
