public static LambdaExpression BuildPredicate(this Filter filter, Type type, VariableResolver variableResolver = null, IEnumerable <string> validProperties = null, IDictionary <string, string> propertyMapping = null)
{
if (filter == null)
{
throw new ArgumentNullException(nameof(filter));
}
if (type == null)
{
throw new ArgumentNullException(nameof(type));
}
var arg = new BuildArgument
{
ValidProperties = validProperties,
EvaluationType = type,
VariableResolver = variableResolver,
PropertyMapping = propertyMapping
};
if (!IsValid(filter, arg))
{
throw new InvalidOperationException("The operator or property name is not valid");
}
return(Interpreter.BuildPredicate(filter.Operator.GetComparisonOperator(), arg.MapProperty(filter.Property), filter.Value, type, arg.VariableResolver));
}
public static EvaluationResult <T, bool> TryBuildPredicate <T>(this IEnumerable <Filter> filters, VariableResolver variableResolver = null, IEnumerable <string> validProperties = null, IDictionary <string, string> propertyMapping = null)
{
if (filters == null)
{
throw new ArgumentNullException(nameof(filters));
}
var result = TryBuildPredicate(filters, typeof(T), variableResolver, validProperties, propertyMapping);
return(new EvaluationResult <T, bool>
{
Exception = result.Exception,
InvalidOperators = result.InvalidOperators,
InvalidProperties = result.InvalidProperties,
InvalidValues = result.InvalidValues,
InvalidVariables = result.InvalidVariables,
Result = (Expression <Func <T, bool> >)result.Result,
Succeeded = result.Succeeded
});
}
public static LambdaExpression BuildPredicate(this IEnumerable <Filter> filters, Type type, VariableResolver variableResolver = null, IEnumerable <string> validProperties = null, IDictionary <string, string> propertyMapping = null)
{
if (filters == null)
{
throw new ArgumentNullException(nameof(filters));
}
if (type == null)
{
throw new ArgumentNullException(nameof(type));
}
var arg = new BuildArgument
{
ValidProperties = validProperties,
EvaluationType = type,
VariableResolver = variableResolver,
PropertyMapping = propertyMapping
};
return(BuildPredicateInternal(filters, type, arg));
}
public static Expression <Func <T, bool> > BuildPredicate <T>(this IEnumerable <Filter> filters, VariableResolver variableResolver = null, IEnumerable <string> validProperties = null, IDictionary <string, string> propertyMapping = null)
{
return((Expression <Func <T, bool> >)BuildPredicate(filters, typeof(T), variableResolver, validProperties, propertyMapping));
}
public static EvaluationResult <T, bool> ParsePredicate <T>(this string expression, VariableResolver variableResolver = null, IEnumerable <string> validProperties = null, IDictionary <string, string> propertyMapping = null)
{
if (string.IsNullOrWhiteSpace(expression))
{
throw new ArgumentException("Invalid expression", nameof(expression));
}
var type = typeof(T);
var result = ExpressionParser.Parse(expression, type, new BuildArgument
{
ValidProperties = validProperties,
EvaluationType = type,
VariableResolver = variableResolver,
PropertyMapping = propertyMapping
});
return(new EvaluationResult <T, bool>
{
Result = (Expression <Func <T, bool> >)result.Result,
Exception = result.Exception,
InvalidProperties = result.InvalidProperties,
InvalidVariables = result.InvalidVariables,
InvalidOperators = result.InvalidOperators,
Succeeded = result.Succeeded
});
}
public static EvaluationResult TryBuildPredicate(this Filter filter, Type type, VariableResolver variableResolver = null, IEnumerable <string> validProperties = null, IDictionary <string, string> propertyMapping = null)
{
if (filter == null)
{
throw new ArgumentNullException(nameof(filter));
}
if (type == null)
{
throw new ArgumentNullException(nameof(type));
}
var arg = new BuildArgument
{
ValidProperties = validProperties,
EvaluationType = type,
VariableResolver = variableResolver,
PropertyMapping = propertyMapping
};
return(TryBuildPredicate(filter, type, arg));
}
internal static Expression BuildBody(ComparisonOperator @operator, MemberExpression prop, object value, VariableResolver variableResolver)
{
if (value is string && prop.Type != typeof(string) && @operator != ComparisonOperator.In)
{
var varName = (string)value;
if (variableResolver.IsVariable(varName) && variableResolver.TryResolve(varName, out var result))
{
value = Convert.ChangeType(result, prop.Type);
}
else
{
value = varName.Cast(prop.Type);
}
}
@operator = CorrectOperator(prop.Type, @operator);
switch (@operator)
{
case ComparisonOperator.NotEqual:
return(Expression.NotEqual(prop, Expression.Constant(value, prop.Type)));
case ComparisonOperator.LessThan:
return(Expression.LessThan(prop, Expression.Constant(value, prop.Type)));
case ComparisonOperator.LessThanOrEqual:
return(Expression.LessThanOrEqual(prop, Expression.Constant(value, prop.Type)));
case ComparisonOperator.GreaterThan:
return(Expression.GreaterThan(prop, Expression.Constant(value, prop.Type)));
case ComparisonOperator.GreaterThanOrEqual:
return(Expression.GreaterThanOrEqual(prop, Expression.Constant(value, prop.Type)));
case ComparisonOperator.Contains:
return(Expression.Call(prop, StringContainsMethod, Expression.Constant(value, prop.Type)));
case ComparisonOperator.StartsWith:
return(Expression.Call(prop, StringStartsWithMethod, Expression.Constant(value, prop.Type)));
case ComparisonOperator.EndsWith:
return(Expression.Call(prop, StringEndsWithMethod, Expression.Constant(value, prop.Type)));
case ComparisonOperator.In:
return(Expression.Call(typeof(Enumerable), nameof(Enumerable.Contains), new Type[] { prop.Type }, new ArrayList {
Type = prop.Type, DrawValue = value.ToString()
}.Build(null), prop));
default:
return(Expression.Equal(prop, Expression.Constant(value, prop.Type)));
}
}
public static LambdaExpression BuildPredicate(this FilterGroup filterGroup, Type type, VariableResolver variableResolver = null, IEnumerable <string> validProperties = null, IDictionary <string, string> propertyMapping = null)
{
if (filterGroup == null)
{
throw new ArgumentNullException(nameof(filterGroup));
}
if (type == null)
{
throw new ArgumentNullException(nameof(type));
}
var arg = new BuildArgument
{
ValidProperties = validProperties,
EvaluationType = type,
VariableResolver = variableResolver,
PropertyMapping = propertyMapping
};
if (!IsValid(filterGroup, arg))
{
throw new InvalidOperationException("The operator or property name is not valid");
}
return(FilterExtensions.BuildPredicateInternal(filterGroup.Filters, type, arg));
}
public static Expression <Func <TEntity, bool> > BuildPredicate <TEntity>(string propertyName, ComparisonOperator @operator, object value, VariableResolver variableResolver = null)
{
if (string.IsNullOrWhiteSpace(propertyName))
{
throw new ArgumentException($"{nameof(propertyName)} is required", nameof(propertyName));
}
return((Expression <Func <TEntity, bool> >)BuildPredicate(@operator, propertyName, value, typeof(TEntity), variableResolver ?? new VariableResolver()));
}
public static LambdaExpression BuildPredicate(string propertyName, ComparisonOperator @operator, object value, Type type, VariableResolver variableResolver = null)
{
if (string.IsNullOrWhiteSpace(propertyName))
{
throw new ArgumentException($"{nameof(propertyName)} is required", nameof(propertyName));
}
if (type == null)
{
throw new ArgumentNullException(nameof(type));
}
return(BuildPredicate(@operator, propertyName, value, type, variableResolver ?? new VariableResolver()));
}
public static EvaluationResult ParsePredicate(this string expression, Type type, VariableResolver variableResolver = null, IEnumerable <string> validProperties = null, IDictionary <string, string> propertyMapping = null)
{
if (string.IsNullOrWhiteSpace(expression))
{
throw new ArgumentException($"{nameof(expression)} is required", nameof(expression));
}
if (type == null)
{
throw new ArgumentNullException(nameof(type));
}
return(ExpressionParser.Parse(expression, type, new BuildArgument
{
ValidProperties = validProperties,
EvaluationType = type,
VariableResolver = variableResolver,
PropertyMapping = propertyMapping
}));
}
public static EvaluationResult <T, bool> TryBuildPredicate <T>(this FilterGroup filterGroup, VariableResolver variableResolver = null, IEnumerable <string> validProperties = null, IDictionary <string, string> propertyMapping = null)
{
if (filterGroup == null)
{
throw new ArgumentNullException(nameof(filterGroup));
}
;
var arg = new BuildArgument
{
ValidProperties = validProperties,
EvaluationType = typeof(T),
VariableResolver = variableResolver,
PropertyMapping = propertyMapping
};
return(TryBuildPredicate <T>(filterGroup, arg));
}
public static LambdaExpression BuildPredicate(this IEnumerable <FilterGroup> filterGroups, Type type, VariableResolver variableResolver = null, IEnumerable <string> validProperties = null, IDictionary <string, string> propertyMapping = null)
{
if (filterGroups == null)
{
throw new ArgumentNullException(nameof(filterGroups));
}
if (type == null)
{
throw new ArgumentNullException(nameof(type));
}
var arg = new BuildArgument
{
ValidProperties = validProperties,
EvaluationType = type,
VariableResolver = variableResolver,
PropertyMapping = propertyMapping
};
if (!IsValid(filterGroups, arg))
{
throw new InvalidOperationException("The operator or property name is not valid");
}
var allFilterGroups = filterGroups as FilterGroup[] ?? filterGroups.ToArray();
allFilterGroups = allFilterGroups.Where(p => p?.Filters?.Any() == true).ToArray();
if (!allFilterGroups.Any())
{
return(FilterExtensions.AlwaysTruePredicate(type));
}
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(Expression.Lambda(body, param));
}
public virtual Condition <T> BuildCondition <T>(VariableResolver variableResolver = null, IEnumerable <string> validProperties = null, IDictionary <string, string> propertyMapping = null)
{
return((Condition <T>)BuildCondition(typeof(T), variableResolver, validProperties, propertyMapping));
}
internal static LambdaExpression BuildPredicate(ComparisonOperator @operator, string propertyName, object value, Type type, VariableResolver variableResolver)
{
var param = type.CreateParameterExpression();
var prop = param.CreatePropertyExpression(propertyName);
var body = BuildBody(@operator, prop, value, variableResolver);
return(Expression.Lambda(body, param));
}
public virtual Condition BuildCondition(Type type, VariableResolver variableResolver = null, IEnumerable <string> validProperties = null, IDictionary <string, string> propertyMapping = null)
{
if (type == null)
{
throw new ArgumentNullException(nameof(type));
}
var arg = new BuildArgument
{
ValidProperties = validProperties,
VariableResolver = variableResolver,
EvaluationType = type,
PropertyMapping = propertyMapping
};
var error = new ConditionBase.ErrorInfo();
var result = new Condition();
var predicates = new List <LambdaExpression>();
var exceptions = new List <Exception>();
OrderByClause orderByClause = null;
if (Filters != null && Filters.Any())
{
var filtersResult = Filters.TryBuildPredicate(type, arg);
if (filtersResult.Succeeded)
{
predicates.Add(filtersResult.Result);
}
else
{
if (filtersResult.Exception != null)
{
exceptions.Add(filtersResult.Exception);
}
}
}
if (FilterGroups != null && FilterGroups.Any())
{
var filterGroupsResult = FilterGroups.TryBuildPredicate(type, arg);
if (filterGroupsResult.Succeeded)
{
predicates.Add(filterGroupsResult.Result);
}
else
{
if (filterGroupsResult.Exception != null)
{
exceptions.Add(filterGroupsResult.Exception);
}
}
}
if (!string.IsNullOrEmpty(Where))
{
var whereResult = ExpressionParser.Parse(Where, type, arg);
if (whereResult.Succeeded)
{
predicates.Add(whereResult.Result);
}
else
{
if (whereResult.Exception != null)
{
exceptions.Add(whereResult.Exception);
}
}
}
if (!string.IsNullOrWhiteSpace(OrderBy))
{
var orderByResult = OrderByParser.Parse(OrderBy, arg);
if (orderByResult.Succeeded)
{
orderByClause = orderByResult.Result;
}
else
{
if (orderByResult.Exception != null)
{
exceptions.Add(orderByResult.Exception);
}
}
}
else if (OrderBys != null && OrderBys.Any())
{
var orderBysResult = OrderByParser.Parse(OrderBys.ToArray(), arg);
if (orderBysResult.Succeeded)
{
orderByClause = orderBysResult.Result;
}
else
{
if (orderBysResult.Exception != null)
{
exceptions.Add(orderBysResult.Exception);
}
}
}
var isInvalid = arg.InvalidProperties.Any() || arg.InvalidOperators.Any() || arg.InvalidVariables.Any() || exceptions.Any();
result.IsValid = !isInvalid;
if (isInvalid)
{
error.EvaluationResult = new EvaluationResultBase
{
InvalidProperties = arg.InvalidProperties,
InvalidValues = arg.InvalidValues,
InvalidOperators = arg.InvalidOperators,
InvalidVariables = arg.InvalidVariables,
InvalidOrderByDirections = arg.InvalidOrderByDirections
};
error.Exceptions = exceptions;
result.Error = error;
}
else
{
result.Predicates = predicates;
result.OrderByClause = orderByClause;
}
return(result);
}
public static Expression <Func <T, bool> > BuildPredicate <T>(this FilterGroup filterGroup, VariableResolver variableResolver = null, IEnumerable <string> validProperties = null, IDictionary <string, string> propertyMapping = null)
{
if (filterGroup == null)
{
throw new ArgumentNullException(nameof(filterGroup));
}
return((Expression <Func <T, bool> >)FilterExtensions.BuildPredicate(filterGroup.Filters, typeof(T), variableResolver, validProperties, propertyMapping));
}