internal static EvaluationResult TryBuildPredicate(this Filter filter, Type type, BuildArgument arg)
{
var isInvalid = !arg.IsValidProperty(filter.Property);
isInvalid |= !arg.IsValidOperator(filter.Operator);
if (isInvalid)
{
return(new EvaluationResult
{
InvalidProperties = arg.InvalidProperties,
InvalidOperators = arg.InvalidOperators
});
}
try
{
var expression = Interpreter.BuildPredicate(filter.Operator.GetComparisonOperator(), arg.MapProperty(filter.Property), filter.Value, type, arg.VariableResolver);
return(new EvaluationResult
{
Result = expression,
Succeeded = true
});
}
catch (Exception ex)
{
return(new EvaluationResult
{
Exception = ex
});
}
}
internal static EvaluationResult <T, bool> TryBuildPredicate <T>(this FilterGroup filterGroup, BuildArgument arg)
{
filterGroup.Filters.ForEach(f => { arg.IsValidProperty(f.Property); arg.IsValidOperator(f.Operator); });
if (arg.InvalidProperties.Any() || arg.InvalidOperators.Any())
{
return(new EvaluationResult <T, bool>
{
InvalidProperties = arg.InvalidProperties,
InvalidOperators = arg.InvalidOperators
});
}
try
{
var expression = (Expression <Func <T, bool> >)FilterExtensions.BuildPredicateInternal(filterGroup.Filters, typeof(T), arg);
return(new EvaluationResult <T, bool>
{
Result = expression,
Succeeded = true
});
}
catch (Exception ex)
{
return(new EvaluationResult <T, bool>
{
Exception = ex
});
}
}
internal static EvaluationResult TryBuildPredicate(this IEnumerable <Filter> filters, Type type, BuildArgument arg)
{
if (filters == null)
{
throw new ArgumentNullException(nameof(filters));
}
if (type == null)
{
throw new ArgumentNullException(nameof(type));
}
if (!filters.Any())
{
return new EvaluationResult
{
Succeeded = true,
Result = AlwaysTruePredicate(type)
}
}
;
var allFilters = filters as Filter[] ?? filters.ToArray();
foreach (var filter in allFilters)
{
arg.IsValidProperty(filter?.Property);
arg.IsValidOperator(filter?.Operator);
}
if (arg.InvalidOperators.Any() || arg.InvalidProperties.Any())
{
return(new EvaluationResult
{
InvalidProperties = arg.InvalidProperties,
InvalidOperators = arg.InvalidOperators
});
}
try
{
var param = type.CreateParameterExpression();
var body = BuildBody(allFilters, param, arg);
return(new EvaluationResult
{
Succeeded = true,
Result = Expression.Lambda(body, param)
});
}
catch (Exception ex)
{
return(new EvaluationResult
{
Exception = ex
});
}
}
internal static EvaluationResult TryBuildPredicate(this IEnumerable <FilterGroup> filterGroups, Type type, BuildArgument arg)
{
if (!filterGroups.Any())
{
return new EvaluationResult
{
Succeeded = true,
Result = FilterExtensions.AlwaysTruePredicate(type)
}
}
;
var allFilterGroups = filterGroups as FilterGroup[] ?? filterGroups.ToArray();
foreach (var filterGroup in allFilterGroups)
{
if (filterGroup is null)
{
throw new InvalidOperationException("FilterGroup can not be null");
}
if (filterGroup.Filters is null)
{
throw new InvalidOperationException("Filters of FilterGroup can not be null");
}
foreach (var filter in filterGroup.Filters)
{
arg.IsValidProperty(filter.Property);
arg.IsValidOperator(filter.Operator);
}
}
if (arg.InvalidOperators.Any() || arg.InvalidProperties.Any())
{
return(new EvaluationResult
{
InvalidProperties = arg.InvalidProperties,
InvalidOperators = arg.InvalidOperators
});
}
try
{
var param = type.CreateParameterExpression();
var body = allFilterGroups.Aggregate((Expression)null, (current, next) => current == null
? FilterExtensions.BuildBody(next.Filters.ToArray(), param, arg)
: Expression.OrElse(current, FilterExtensions.BuildBody(next.Filters.ToArray(), param, arg)));
return(new EvaluationResult
{
Succeeded = true,
Result = Expression.Lambda(body, param)
});
}
catch (Exception ex)
{
return(new EvaluationResult
{
Exception = ex
});
}
}
