public static FilterDefinition <T> ToMongodbFilter(QueryModel3 queryModel)
{
if (queryModel.QueryUnits != null && queryModel.QueryUnits.Any())
{
List <FilterDefinition <T> > unitFilters = new List <FilterDefinition <T> >();
foreach (var unitItem in queryModel.QueryUnits)
{
var unitFilter = MongodbHelper.HandleQueryUnitModel <T>(unitItem);
if (unitFilter != null)
{
unitFilters.Add(unitFilter);
}
}
return(MongodbHelper.HandleFilterDefinitions(unitFilters, queryModel.LogicalOperator));
}
else
{
var filter = Builders <T> .Filter.Empty;
if (queryModel.QueryModels == null || !queryModel.QueryModels.Any())
{
return(filter);
}
List <FilterDefinition <T> > queryModelFilters = new List <FilterDefinition <T> >();
foreach (var queryModel2Item in queryModel.QueryModels)
{
queryModelFilters.Add(ToMongodbFilter(queryModel2Item));
}
return(MongodbHelper.HandleFilterDefinitions(queryModelFilters, queryModel.LogicalOperator));
}
}
private static FilterDefinition <T> HandleSimpleExpression(string filterStr, Dictionary <string, QueryUnit> keyValues, Dictionary <string, FilterDefinition <T> > dicFilterDefinition)
{
// 1、筛选出操作符：&、|
Queue <char> qOperator = new Queue <char>();
//Regex regexOperator = new Regex("[&|]");
//foreach (Match item in regexOperator.Matches(logicalExpression))
//{
// qOperator.Enqueue(item.Value);
//}
foreach (char c in filterStr)
{
if (c == '&' || c == '|')
{
qOperator.Enqueue(c);
}
}
// 2、筛选出所有的变量
Queue <string> qVariable = new Queue <string>();
string[] tempVariables = filterStr.Replace("&", ",").Replace("|", ",").Split(",");
foreach (string v in tempVariables)
{
qVariable.Enqueue(v);
}
// 3、返回结果组装
FilterDefinition <T> filter = null;
if (qVariable.Count >= 1)
{
string tempV = qVariable.Dequeue();
filter = dicFilterDefinition.ContainsKey(tempV) ? dicFilterDefinition[tempV] : MongodbHelper.HandleQueryUnitModel <T>(keyValues[tempV]);
while (qVariable.Count > 0)
{
string rightV = qVariable.Dequeue();
var tempFilter = dicFilterDefinition.ContainsKey(rightV) ? dicFilterDefinition[rightV] : MongodbHelper.HandleQueryUnitModel <T>(keyValues[rightV]);
char tempOperator = qOperator.Dequeue();
switch (tempOperator)
{
case '&':
{
filter &= tempFilter;
break;
}
case '|':
{
filter |= tempFilter;
break;
}
}
}
filter = Builders <T> .Filter.Empty & (filter);
}
return(filter ?? Builders <T> .Filter.Empty);
}