/// <summary>
/// Read an BsonArray from reader
/// </summary>
public BsonArray ReadArray(ByteReader reader)
{
var length = reader.ReadInt32();
var end = reader.Position + length - 5;
var arr = new BsonArray();
while (reader.Position < end)
{
var value = this.ReadElement(reader, out string name);
arr.Add(value);
}
reader.ReadByte(); // zero
return(arr);
}
/// <summary>
/// Get internal information about database. Can filter collections
/// </summary>
public BsonDocument Info()
{
using (_locker.Read())
{
var header = _pager.GetPage <HeaderPage>(0);
var collections = new BsonArray();
foreach (var colName in header.CollectionPages.Keys)
{
var col = this.GetCollectionPage(colName, false);
var colDoc = new BsonDocument
{
{ "name", col.CollectionName },
{ "pageID", (double)col.PageID },
{ "count", col.DocumentCount },
{ "sequence", col.Sequence },
{ "indexes", new BsonArray(
col.Indexes.Where(x => !x.IsEmpty).Select(i => new BsonDocument
{
{ "slot", i.Slot },
{ "field", i.Field },
{ "expression", i.Expression },
{ "unique", i.Unique }
})) }
};
collections.Add(colDoc);
}
return(new BsonDocument
{
{ "userVersion", (int)header.UserVersion },
{ "encrypted", header.Password.Any(x => x > 0) },
{ "changeID", (int)header.ChangeID },
{ "lastPageID", (int)header.LastPageID },
{ "fileSize", BasePage.GetSizeOfPages(header.LastPageID + 1) },
{ "collections", collections }
});
}
}
private BsonArray ReadArray()
{
var arr = new BsonArray();
var token = _tokenizer.ReadToken();
while (token.TokenType != JsonTokenType.EndArray)
{
var value = this.ReadValue(token);
arr.Add(value);
token = _tokenizer.ReadToken();
if (token.TokenType == JsonTokenType.Comma)
{
token = _tokenizer.ReadToken();
}
}
return(arr);
}
/// <summary>
/// Register a property as a DbRefList - implement a custom Serialize/Deserialize actions to convert entity to $id, $ref only
/// </summary>
private static void RegisterDbRefList(BsonMapper mapper, MemberMapper member, string collection)
{
// get entity from list item type
var entity = mapper.GetEntityMapper(member.UnderlyingType);
member.Serialize = (list, m) =>
{
// supports null values when "SerializeNullValues = true"
if (list == null)
{
return(BsonValue.Null);
}
var result = new BsonArray();
var idField = entity.Id;
foreach (var item in (IEnumerable)list)
{
if (item == null)
{
continue;
}
var id = idField.Getter(item);
result.Add(new BsonDocument
{
{ "$id", m.Serialize(id.GetType(), id, 0) },
{ "$ref", collection }
});
}
return(result);
};
member.Deserialize = (bson, m) =>
{
var array = bson.AsArray;
if (array.Count == 0)
{
return(m.Deserialize(member.DataType, array));
}
// copy array changing $id to _id
var result = new BsonArray();
foreach (var item in array)
{
var refId = item.AsDocument["$id"];
// if refId is null was included by "include" query, so "item" is full filled document
if (refId.IsNull)
{
result.Add(item);
}
else
{
result.Add(new BsonDocument {
{ "_id", refId }
});
}
}
return(m.Deserialize(member.DataType, result));
};
}
