public static Expression GetMergeExpression(string query, Type itemType)
{
EvoQLBuilder builder = new EvoQLBuilder(query);
ParameterExpression parameterExpression;
EvoQLExpression parse;
var filterexpr = builder.GetFilterExpression(out parse, out parameterExpression);
var get = parse.Tree as GetExpression;
var isCount = get.Select == "Count";
var select = new SelectDescriptor {
SourcePath = get.Select, Aggregate = isCount ? "Count" : "Sum", TargetPath = isCount ? "_Count" : get.Select
};
var mapreduceexpr = GetReduceExpression(query, itemType);
var resultType = mapreduceexpr.GetType().GetProperty("ReturnType").GetValue(mapreduceexpr, null) as Type;
var resultElementType = ReduceExpressionGeneration.GetTypeOfEnumerable(resultType);
//Expression mergeExpr = ReduceExpressionGeneration.GetMergeExpression(select, resultElementType);
var mergeexpr = ReduceExpressionGeneration.GetMergeInvocationExpression(select, resultType);
return(mergeexpr);
}
//public static Expression GetFilterLambdaWithParameters(string query, Type itemType)
//{
// EvoQLBuilder builder = new EvoQLBuilder(query);
// ParameterExpression parameterExpression;
// EvoQLExpression parse;
// return builder.GetFilterLambdaWithParameters(out parse, out parameterExpression);
//}
public static Expression GetWhereExpression(string query, Type itemType)
{
EvoQLBuilder builder = new EvoQLBuilder(query);
ParameterExpression parameterExpression;
EvoQLExpression parse;
var filterexpr = builder.GetFilterExpression(out parse, out parameterExpression);
var queryexpr = ReduceExpressionGeneration.GetMapreduceExpression(filterexpr, null, null, itemType);
return(queryexpr);
}
public static Expression GetReduceExpression(string query, Type itemType)
{
EvoQLBuilder builder = new EvoQLBuilder(query);
ParameterExpression parameterExpression;
EvoQLExpression parse;
var filterexpr = builder.GetFilterExpression(out parse, out parameterExpression);
var get = parse.Tree as GetExpression;
//var interval = get.Interval == null ? null : new IntervalTypes?( TryParseEnum(get.Interval, IntervalTypes.None) );
//var select = TryParseEnum(get.Select, SelectTypes.Count);
var groupBySortDirection = get.GroupByDescending.HasValue ? (get.GroupByDescending == true ? new OrderTypes?(OrderTypes.Descending): new OrderTypes?(OrderTypes.Ascending)) : null;
var groupOverSortDirection = get.GroupOverDescending.HasValue ? (get.GroupOverDescending == true ? new OrderTypes?(OrderTypes.Descending) : new OrderTypes?(OrderTypes.Ascending)) : null;
var dimensions = new ReduceDimension[]
{
new ReduceDimension {
GroupBy = get.GroupBy, OrderBy = new SelectDescriptor {
SourcePath = get.GroupByOrderBy
}, Order = groupBySortDirection, Take = get.GroupByTake, Interval = get.GroupByInterval
},
new ReduceDimension {
GroupBy = get.GroupOver, OrderBy = new SelectDescriptor {
SourcePath = get.GroupOverOrderBy
}, Order = groupOverSortDirection, Take = get.GroupOverTake, Interval = get.GroupOverInterval
}
};
//foreach (var d in dimensions) if (d.GroupBy == GroupByTypes.Date) d.Interval = interval;
var aggregate = get.Select == "Count" ? "Count" : "Sum";
var sourcePath = get.Select == "Count" ? null : get.Select;
var reduceexpr = ReduceExpressionGeneration.GetMapreduceExpression(filterexpr, new SelectDescriptor {
TargetPath = get.Select, SourcePath = sourcePath, Aggregate = aggregate
}, dimensions, itemType);
return(reduceexpr);
}