private object ExecuteMapReduce(MongoQueryObject queryObject)
{
var miGetCollection = typeof(IMongoDatabase).GetMethods().Where(m => m.Name == "GetCollection" && m.GetGenericArguments().Length == 1 && m.GetParameters().Length == 1).Single().MakeGenericMethod(queryObject.DocumentType);
var collection = miGetCollection.Invoke(queryObject.Database, new[] { queryObject.CollectionName });
var mapReduce = collection.GetType().GetMethod("MapReduce").Invoke(collection, null);
var mapReduceCommand = (MapReduceCommand)mapReduce.GetType().GetProperty("Command").GetValue(mapReduce, null);
mapReduceCommand.Map = new Code(queryObject.MapFunction);
mapReduceCommand.Reduce = new Code(queryObject.ReduceFunction);
mapReduceCommand.Finalize = new Code(queryObject.FinalizerFunction);
mapReduceCommand.Query = queryObject.Query;
if (queryObject.Sort != null)
{
mapReduceCommand.Sort = queryObject.Sort;
}
mapReduceCommand.Limit = queryObject.NumberToLimit;
if (queryObject.NumberToSkip != 0)
{
throw new InvalidQueryException("MapReduce queries do no support Skips.");
}
var executor = GetExecutor(typeof(Document), queryObject.Projector, queryObject.Aggregator, true);
return(executor.Compile().DynamicInvoke(mapReduce.GetType().GetProperty("Documents").GetValue(mapReduce, null)));
}
private object ExecuteFind(MongoQueryObject queryObject)
{
var miGetCollection = typeof(IMongoDatabase).GetMethods().Where(m => m.Name == "GetCollection" && m.GetGenericArguments().Length == 1 && m.GetParameters().Length == 1).Single().MakeGenericMethod(queryObject.DocumentType);
var collection = miGetCollection.Invoke(queryObject.Database, new[] { queryObject.CollectionName });
var cursor = collection.GetType().GetMethod("FindAll")
.Invoke(collection, null);
var cursorType = cursor.GetType();
Document spec;
if (queryObject.Sort != null)
{
spec = new Document
{
{ "query", queryObject.Query },
{ "orderby", queryObject.Sort }
};
}
else
{
spec = queryObject.Query;
}
cursorType.GetMethod("Spec", new[] { typeof(Document) }).Invoke(cursor, new object[] { spec });
if (queryObject.Fields.Count > 0)
{
cursorType.GetMethod("Fields", new[] { typeof(Document) }).Invoke(cursor, new object[] { queryObject.Fields });
}
cursorType.GetMethod("Limit").Invoke(cursor, new object[] { queryObject.NumberToLimit });
cursorType.GetMethod("Skip").Invoke(cursor, new object[] { queryObject.NumberToSkip });
var executor = GetExecutor(queryObject.DocumentType, queryObject.Projector, queryObject.Aggregator, true);
return(executor.Compile().DynamicInvoke(cursor.GetType().GetProperty("Documents").GetValue(cursor, null)));
}
/// <summary>
/// Executes the count.
/// </summary>
/// <param name="queryObject">The query object.</param>
/// <returns></returns>
private object ExecuteCount(MongoQueryObject queryObject)
{
var miGetCollection = typeof(IMongoDatabase).GetMethods().Where(m => m.Name == "GetCollection" && m.GetGenericArguments().Length == 1 && m.GetParameters().Length == 1).Single().MakeGenericMethod(queryObject.DocumentType);
var collection = miGetCollection.Invoke(queryObject.Database, new[] { queryObject.CollectionName });
if (queryObject.Query == null)
{
return(Convert.ToInt32(collection.GetType().GetMethod("Count", Type.EmptyTypes).Invoke(collection, null)));
}
return(Convert.ToInt32(collection.GetType().GetMethod("Count", new[] { typeof(object) }).Invoke(collection, new[] { queryObject.Query })));
}
/// <summary>
/// Executes the query object.
/// </summary>
/// <param name="queryObject">The query object.</param>
/// <returns></returns>
internal object ExecuteQueryObject(MongoQueryObject queryObject)
{
if (queryObject.IsCount)
{
return(ExecuteCount(queryObject));
}
if (queryObject.IsMapReduce)
{
return(ExecuteMapReduce(queryObject));
}
return(ExecuteFind(queryObject));
}
