CreateSearchPredicate <T>(ExpressionOpFactory factory, GridOptions options)
{
bool isGroupOperationAND = options.Filters.GroupOperation == GridGroupSearchOperation.AND;
var predicate = isGroupOperationAND ?
PredicateBuilder.True <T>() :
PredicateBuilder.False <T>();
foreach (var rule in options.Filters.FilterRules)
{
var operationAttribute = factory.GetExpressionType(rule.Operation);
PropertyInfo pi = typeof(T).GetProperty(rule.Field);
ParameterExpression lhsParam = Expression.Parameter(typeof(T));
Expression lhs = Expression.Property(lhsParam, pi);
Expression rhs = Expression.Constant(Convert.ChangeType(rule.FieldData, pi.PropertyType));
Expression theOperation;
if (operationAttribute.UseMethod)
{
lhs = Expression.Call(lhs, operationAttribute.Method, null, rhs);
}
if (operationAttribute.IsBinary)
{
theOperation = Expression.MakeBinary(operationAttribute.ExpressionType, lhs, rhs);
}
else //TODO: need to fix this
{
theOperation = Expression.MakeBinary(operationAttribute.ExpressionType, lhs, Expression.Constant(operationAttribute.MethodResultCompareValue));
}
var theLambda = Expression.Lambda <Func <T, bool> >(theOperation, lhsParam);
if (isGroupOperationAND)
{
predicate = predicate.And(theLambda);
}
else
{
predicate = predicate.Or(theLambda);
}
}
return(predicate);
}
public GridController()
{
_connectionString = "mongodb://localhost:27020";
_dbName = "Baseball2013";
_config = new OpConfig()
.Add("eq", new ExpressionBehavior {
IsBinary = true, ExpressionType = ExpressionType.Equal
})
.Add("ne", new ExpressionBehavior {
IsBinary = true, ExpressionType = ExpressionType.NotEqual
})
.Add("gt", new ExpressionBehavior {
IsBinary = true, ExpressionType = ExpressionType.GreaterThan
})
.Add("ge", new ExpressionBehavior {
IsBinary = true, ExpressionType = ExpressionType.GreaterThanOrEqual
})
.Add("lt", new ExpressionBehavior {
IsBinary = true, ExpressionType = ExpressionType.LessThan
})
.Add("le", new ExpressionBehavior {
IsBinary = true, ExpressionType = ExpressionType.LessThanOrEqual
})
.Add("bw", new ExpressionBehavior {
IsBinary = false, MethodResultCompareValue = true, ExpressionType = ExpressionType.Equal, UseMethod = true, Method = "StartsWith"
})
.Add("bn", new ExpressionBehavior {
IsBinary = false, MethodResultCompareValue = false, ExpressionType = ExpressionType.Equal, UseMethod = true, Method = "StartsWith"
})
.Add("ew", new ExpressionBehavior {
IsBinary = false, MethodResultCompareValue = true, ExpressionType = ExpressionType.Equal, UseMethod = true, Method = "EndsWith"
})
.Add("en", new ExpressionBehavior {
IsBinary = false, MethodResultCompareValue = false, ExpressionType = ExpressionType.Equal, UseMethod = true, Method = "EndsWith"
})
.Add("cn", new ExpressionBehavior {
IsBinary = false, MethodResultCompareValue = true, ExpressionType = ExpressionType.Equal, UseMethod = true, Method = "Contains"
})
.Add("nc", new ExpressionBehavior {
IsBinary = false, MethodResultCompareValue = false, ExpressionType = ExpressionType.Equal, UseMethod = true, Method = "Contains"
});
_factory = new ExpressionOpFactory(_config);
}
