protected virtual MessageEntry GetEntry(Type type, IRule rule, EquatableExpression expression)
{
var entries = _messageEntries.ToArray();
//entries = entries.Where(e => e.Type.IsAssignableFrom(validationError.Value.GetType())).ToArray();
entries = entries.Where(e => e.Type == type).ToArray();
if (entries.Length == 0)
{
return(null);
}
var entriesByExpression = entries.Where(e => expression == null || expression.AppliesTo(e.Expression)).ToArray();
if (entriesByExpression.Length == 0)
{
entriesByExpression = entries.Where(e => e.Expression == null).ToArray();
if (entriesByExpression.Length == 0)
{
return(null);
}
}
var entriesByRule = entriesByExpression.Where(e => object.ReferenceEquals(e.Rule, rule)).ToArray();
if (entriesByRule.Length == 0)
{
entriesByRule = entriesByExpression.Where(e => object.ReferenceEquals(e.Rule, null)).ToArray();
if (entriesByRule.Length == 0)
{
return(null);
}
}
return(entriesByRule.Last());
}
private bool HasError(object value, EquatableExpression expression, out ValidationError[] validationErrors)
{
validationErrors = null;
if (value == null)
{
throw new System.ArgumentNullException("value");
}
Dictionary <EquatableExpression, List <ValidationError> > errorsOnValue;
if (!_errors.TryGetValue(value, out errorsOnValue))
{
return(false);
}
//If we don't care on which expression the error occured, return true.
if (expression == null)
{
//Get all validation errors for that value.
validationErrors = errorsOnValue.SelectMany(k => k.Value).ToArray();
return(true);
}
List <ValidationError> errorsOnExpression;
if (!errorsOnValue.TryGetValue(expression, out errorsOnExpression))
{
return(false);
}
validationErrors = errorsOnExpression.ToArray();
return(true);
}
public void SetErrorMessageFor(Type type, EquatableExpression expression, IRule rule, string message)
{
if (message == null)
{
throw new System.ArgumentNullException("message");
}
SetErrorMessageFor(type, expression, rule, () => message);
}
public MessageEntry(Type type, EquatableExpression expression, IRule rule, Func <string> message)
{
//Type cannot be null, others can however.
if (type == null)
{
throw new System.ArgumentNullException("type");
}
_type = type;
_expression = expression;
_rule = rule;
_message = message;
}
public void SetErrorMessageFor(Type type, EquatableExpression expression, IRule rule, Func <string> message)
{
if (expression == null)
{
throw new System.ArgumentNullException("expression");
}
if (message == null)
{
throw new System.ArgumentNullException("message");
}
//If the expression returns self, ignore the expression.
if (expression == GetSelf(expression.ParameterType))
{
expression = null;
}
_messageEntries.Add(new MessageEntry(type, expression, rule, message));
}
public string GetErrorMessage(Type type, EquatableExpression expression, IRule rule, object[] arguments)
{
var entry = GetEntry(type, rule, expression);
if (entry == null)
{
foreach (Type baseType in GetTypeHierarchy(type))
{
entry = GetEntry(baseType, rule, expression);
if (entry != null)
{
break;
}
}
}
if (entry == null)
{
return(null);
}
return(FormatMessage(entry.Message, arguments));
}
public ValidationError(IRule rule, EquatableExpression expression, object[] validationArguments, object value)
{
if (validationArguments == null)
{
throw new System.ArgumentNullException("validationArguments");
}
if (value == null)
{
throw new System.ArgumentNullException("value");
}
if (expression == null)
{
throw new System.ArgumentNullException("cachedExpression");
}
if (rule == null)
{
throw new System.ArgumentNullException("rule");
}
_rule = rule;
_expression = expression;
_validationArguments = validationArguments;
_value = value;
}
public CompositionInvoker(Engine rulesEngine, Expression <Func <T, R> > compositionExpression)
{
_rulesEngine = rulesEngine;
_compiledExpression = compositionExpression.Compile();
_expression = new EquatableExpression(compositionExpression);
}
public RuleInvoker(IRule <R> rule, Expression <Func <T, R> > expressionToInvoke, EquatableExpression expressionToBlame)
{
_rule = rule;
_compiledExpression = expressionToInvoke.Compile();
_expressionToBlame = expressionToBlame;
}
public string GetErrorMessage(object value, EquatableExpression expression, IErrorResolver resolver)
{
throw new NotImplementedException();
}
public bool HasError(object value, EquatableExpression expression)
{
throw new NotImplementedException();
}
public EnumerableCompositionInvoker(Engine rulesEngine, Expression <Func <T, R> > enumerableCompositionExpression)
{
_rulesEngine = rulesEngine;
_compiledExpression = enumerableCompositionExpression.Compile();
_enumerableCompositionExpression = new EquatableExpression(enumerableCompositionExpression);
}
public bool HasError(object value, EquatableExpression expression)
{
ValidationError[] errors;
return(HasError(value, expression, out errors));
}
public string GetErrorMessage(object value, EquatableExpression expression, IErrorResolver resolver)
{
//NOTE: Expression can be null.
if (value == null)
{
throw new System.ArgumentNullException("value");
}
if (resolver == null)
{
throw new System.ArgumentNullException("resolver");
}
ValidationError[] errors;
ValidationError error;
object[] validationArguments = new object[0];
if (this.HasError(value, expression, out errors))
{
error = errors[0];
validationArguments = error.ValidationArguments;
var message = resolver.GetErrorMessage(error.Value.GetType(), error.Expression, error.Rule, error.ValidationArguments);
return(message);
}
else if (expression != null && expression.Expression.ReturnType.IsClass && expression.Expression.ReturnType != typeof(string))
{
//There may be the case that for compositions, a message is set for CallValidate(). When
//this happens, there won't be any error for a => a.C (where 'C' is another object)
//still, you would like to have a 'C is not valid' message...
//Step 1: find out if there are any Messages defined for that property
var message = resolver.GetErrorMessage(value.GetType(), expression, null, new object[0]);
//if null fallback on message for the type of that property.
if (message == null)
{
message = resolver.GetErrorMessage(expression.Expression.ReturnType, null, null, new object[0]);
}
if (message == null)
{
return(null);
}
//Step 2: There is a Message defined. Find out if there is an error for the property.
object propertyValue = null;
try
{
//TODO: This should be resolved using a Interface maybe.
propertyValue = expression.Expression.Compile().DynamicInvoke(value);
}
catch (NullReferenceException)
{
//NOTE: Swallow all NullReferenceException.
}
catch (Exception ex)
{
//Wrap and re-throw.
throw new InvalidOperationException(string.Format("Could not get property value for expression {0}. See InnerException for details.", expression.Expression), ex);
}
if (propertyValue == null)
{
return(null);
}
//Step 3: The property may be an IEnumerable. Need to return the message if any elements has an error...
//TODO: This is bit dodgy, you should only enumerate if a CallValidateForEach was used...
//Return null if none of the propertyValue(s) have errors.
if (ToEnumerable(propertyValue).All(v => !HasError(v, null)))
{
return(null);
}
return(message);
}
return(null);
}
