private object ExecuteMapReduce(MongoQueryObject queryObject)
{
var options = new MapReduceOptionsBuilder();
options.SetQuery(new QueryDocument(queryObject.Query));
options.SetFinalize(new BsonJavaScript(queryObject.FinalizerFunction));
options.SetLimit(queryObject.NumberToLimit);
if (queryObject.Sort != null)
{
options.SetSortOrder(new SortByDocument(queryObject.Sort));
}
if (queryObject.NumberToSkip != 0)
{
throw new InvalidQueryException("MapReduce queries do not support Skips.");
}
var mapReduce = _collection.MapReduce(
new BsonJavaScript(queryObject.MapFunction),
new BsonJavaScript(queryObject.ReduceFunction),
options);
var executor = GetExecutor(typeof(BsonDocument), queryObject.Projector, queryObject.Aggregator, true);
return(executor.Compile().DynamicInvoke(queryObject.Collection.Database[mapReduce.CollectionName].FindAll()));
}
/// <summary>
/// Executes the count.
/// </summary>
/// <param name="queryObject">The query object.</param>
/// <returns></returns>
private object ExecuteCount(MongoQueryObject queryObject)
{
if (queryObject.Query == null)
{
return((int)_collection.Count());
}
return((int)_collection.Count(new QueryDocument(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));
}
private object ExecuteFind(MongoQueryObject queryObject)
{
var findAsMethod = typeof(MongoCollection).GetGenericMethod(
"FindAs",
BindingFlags.Public | BindingFlags.Instance,
new[] { queryObject.DocumentType },
new[] { typeof(IMongoQuery) });
QueryDocument queryDocument;
if (queryObject.Sort != null)
{
queryDocument = new QueryDocument
{
{ "query", queryObject.Query },
{ "orderby", queryObject.Sort }
};
}
else
{
queryDocument = new QueryDocument(queryObject.Query);
}
var cursor = findAsMethod.Invoke(_collection, new[] { queryDocument });
var cursorType = cursor.GetType();
if (queryObject.Fields.ElementCount > 0)
{
var setFieldsMethod = cursorType.GetMethod(
"SetFields",
BindingFlags.Public | BindingFlags.Instance,
null,
new[] { typeof(IMongoFields) },
null
);
setFieldsMethod.Invoke(cursor, new[] { new FieldsDocument(queryObject.Fields) });
}
var setLimitMethod = cursorType.GetMethod(
"SetLimit",
BindingFlags.Public | BindingFlags.Instance,
null,
new[] { typeof(int) },
null);
setLimitMethod.Invoke(cursor, new object[] { queryObject.NumberToLimit });
var setSkipMethod = cursorType.GetMethod(
"SetSkip",
BindingFlags.Public | BindingFlags.Instance,
null,
new[] { typeof(int) },
null);
setSkipMethod.Invoke(cursor, new object[] { queryObject.NumberToSkip });
var executor = GetExecutor(queryObject.DocumentType, queryObject.Projector, queryObject.Aggregator, true);
return(executor.Compile().DynamicInvoke(cursor));
}
