/// <summary>
/// Validates the specified node.
/// </summary>
/// <param name="node">The node.</param>
/// <returns></returns>
public static IEnumerable<NodeError> Validate(Node node)
{
if (node == null)
{
throw new ArgumentNullException("node");
}
NodeSchema schema;
IEnumerable<Rule> rules;
if ((schema = node.NodeSchema) == null || (rules = schema.Rules) == null)
{
yield break;
}
var rulesArr = rules.Where(r => r != null && !String.IsNullOrWhiteSpace(r.Type)).ToList();
if (rulesArr.Count == 0)
{
yield break;
}
var indexOfReqRule = rulesArr.FindIndex(r => r.Type == ValidationType.Exist);
if (indexOfReqRule >= 0)
{
var reqRule = rulesArr[indexOfReqRule];
string error;
if(TryValidate(node, reqRule, out error))
{
rulesArr.RemoveAll(x => x.Type == ValidationType.Exist);
}
else
{
yield return new NodeError { Message = error, Level = reqRule.Level, Type = ValidationType.Exist };
yield break;
}
}
foreach (var rule in rulesArr)
{
string error;
if (!TryValidate(node, rule, out error))
{
yield return new NodeError { Message = error, Level = rule.Level, Type = rule.Type };
}
}
}
internal static bool TryValidate(Node node, Rule rule, out string error)
{
var cfg = node.Context.Config;
bool isValid;
try
{
var type = rule.Type;
var dataType = node.NodeSchema.DataType;
switch (type)
{
case ValidationType.Exist:
isValid = ValidateRequired(node.Value, dataType, node);
break;
case ValidationType.Positive:
isValid = ValidatePositive(node.Value, dataType);
break;
case ValidationType.Regex:
isValid = ValidatePattern(node.Value, rule.Content);
break;
case ValidationType.MinSize:
case ValidationType.MaxSize:
int size;
if (!Int32.TryParse(rule.Content, out size))
{
size = 0;
}
isValid = ValidateSize(node, dataType, size, type == ValidationType.MaxSize);
break;
case ValidationType.Min:
case ValidationType.Max:
case ValidationType.Same:
case ValidationType.Different:
isValid = ValidateCompare(node, rule.Type, rule.Content);
break;
case ValidationType.Allow:
isValid = ValidateEnumeration(node.Value, dataType, node, rule.Content, false);
break;
case ValidationType.DisAllow:
isValid = ValidateEnumeration(node.Value, dataType, node, rule.Content, true);
break;
case ValidationType.Unique:
isValid = ValidateUniqueNess(node, dataType, rule.Content);
break;
case ValidationType.Expression:
isValid = ValidateExpression(rule.Content, node);
break;
default:
var validator = node.Context.GetValidator(type);
Trace.WriteLineIf(validator == null, "Validator not found for rule type:" + rule.Type);
isValid = validator == null || validator.Validate(node, rule);
break;
}
error = isValid ? rule.Message ?? Extensions.GetDefaultValidationMessage(rule.Type, cfg).FormatWith(rule.Content)
: null;
}
catch (FormatException)
{
isValid = false;
error = "The input value was in an incorrect format";
}
catch (EvaluationException evalEx)
{
isValid = false;
error = "Could not evaluate the rule: [{0}:{1}], ERROR: {2}".FormatWith(rule.Type, rule.Content, evalEx.Message);
}
catch (KeyNotFoundException kex)
{
isValid = false;
error = "Could not evaluate the rule: [{0}:{1}], missing variable: {2}".FormatWith(rule.Type, rule.Content, kex.Data["name"]);
}
catch (Exception ex)
{
isValid = false;
error = "Could not validate rule [{0}:{1}], unknown error:{2}".FormatWith(rule.Type, rule.Content, ex.Message);
}
return isValid;
}
private static bool ValidateUniqueNess(Node node, DataType dataType, string colName)
{
bool result;
switch (dataType)
{
case DataType.List:
var listVal = node.Value as IEnumerable;
if (listVal != null)
{
var ienum = listVal.Cast<object>().ToArray();
result = ienum.Distinct().Count() == ienum.Length;
}
else
{
result = true;
}
break;
case DataType.Table:
var table = node as Table;
TableSchema tblSchema;
if (table != null && table.Count > 0 && !String.IsNullOrWhiteSpace(colName) && (tblSchema = table.NodeSchema as TableSchema) != null && tblSchema.ContainsKey(colName))
{
dynamic tblData = table.Value;
var uniqueRowsCount = (tblData[colName] as IEnumerable<object>).Distinct().Count();
result = uniqueRowsCount == table.Count;
}
else
{
result = true;
}
break;
default:
result = true;
break;
}
return result;
}
private static bool ValidateSize(Node node, DataType dataType, int size, bool isMax)
{
bool result;
var isValidsize = size >= 0;
switch (dataType)
{
case DataType.String:
var str = node.Value as string;
size = isValidsize
? size
: isMax
? 256
: 0;
result = str == null || (isMax ? str.Length <= size : str.Length >= size);
break;
case DataType.List:
int listSize;
IList list;
IEnumerable ienum;
var value = node.Value;
if ((list = node.Value as IList) != null)
{
listSize = list.Count;
}
else if ((ienum = value as IEnumerable) != null)
{
listSize = ienum.Cast<object>().Count();
}
else
{
listSize = -1;
}
size = isValidsize
? size
: isMax
? 32
: 0;
result = listSize == -1 || (isMax ? listSize <= size : listSize >= size);
break;
case DataType.Table:
var table = node as Table;
size = isValidsize
? size
: isMax
? 128
: 0;
result = table == null || (isMax ? table.Count <= size : table.Count >= size);
break;
case DataType.Binary:
var bytes = node.Value as byte[];
size = isValidsize
? size
: isMax
? 1048576
: 0;
result = bytes == null || (isMax ? bytes.Length <= size : bytes.Length >= size);
break;
default:
result = true;
break;
}
return result;
}
//NOTE:type dependant
private static bool ValidateRequired(object value, DataType type, Node node)
{
bool result;
if (value == null)
{
result = false;
}
else
{
switch (type)
{
case DataType.String:
result = !String.IsNullOrEmpty(value.ToString());
break;
case DataType.DateTime:
result = !DateTimeOffset.Equals((DateTimeOffset)value, DateTimeOffset.MinValue);
break;
case DataType.Guid:
result = Guid.Empty != (Guid)value;
break;
case DataType.List:
var ienum = value as IEnumerable<object>;
result = ienum != null && ienum.Count() > 0;
break;
case DataType.Table:
var container = node as Table;
result = container != null && container.Count > 0;
break;
case DataType.Binary:
var stream = value as Stream;
result = stream != null && stream.Length > 0;
break;
default:
result = true;
break;
}
}
return result;
}
private static bool ValidateExpression(string expression, Node node)
{
return String.IsNullOrWhiteSpace(expression)
|| node.Evaluate<bool>(expression);
}
//NOTE:type dependant
private static bool ValidateEnumeration(object value, DataType type, Node node, string listStr, bool isBlackList)
{
bool result;
if (!String.IsNullOrWhiteSpace(listStr)
&& value != null
&& type.IsPrimitive())
{
var enumSchema = new FieldSchema { DataType = type };
var list = listStr.Split(new[] { ',' }, StringSplitOptions.RemoveEmptyEntries)
.Select(x => Parsers.ParseString(x, enumSchema, node.Context))
.Where(x => x != null);
var inList = list.Cast<dynamic>()
.Any(x => x.Equals(value));
result = isBlackList
? !inList
: inList;
}
else
{
result = true;
}
return result;
}
private static bool ValidateCompare(Node node, string compareType, string against)
{
var @operator = GetCompareOperator(compareType);
return @operator == null
|| String.IsNullOrWhiteSpace(against)
|| node.Evaluate<bool>("value " + @operator + "(" + against + ")");
}
private IContext ResolveContext(Node container)
{
return container != null ? container.Context : new DefaultContext();
}
/// <summary>
/// </summary>
protected virtual NodeSchema ResolveSchema(Node container)
{
ContainerNodeSchema containerSchema;
return container != null &&
(containerSchema = container.NodeSchema as ContainerNodeSchema) != null
? containerSchema[Key]
: null;
}
