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// gridfs.h
#pragma once
#include "dbclient.h"
namespace mongo {
typedef unsigned long long gridfs_offset;
class GridFS;
class GridFile;
class Chunk {
public:
Chunk( BSONObj data );
Chunk( BSONElement fileId , int chunkNumber , const char * data , int len );
int len(){
int len;
const char * data = _data["data"].binData( len );
int * foo = (int*)data;
assert( len - 4 == foo[0] );
return len - 4;
}
const char * data( int & len ){
const char * data = _data["data"].binData( len );
int * foo = (int*)data;
assert( len - 4 == foo[0] );
len = len - 4;
return data + 4;
}
private:
BSONObj _data;
friend class GridFS;
};
/**
this is the main entry point into the mongo grid fs
*/
class GridFS{
public:
/**
* @param client - db connection
* @param dbName - root database name
* @param prefix - if you want your data somewhere beisdes <dbname>.fs
*/
GridFS( DBClientBase& client , string dbName , string prefix="fs" );
~GridFS();
/**
* puts the file reference by fileName into the db
* @param fileName relative to process
* @return the id file
*/
BSONElement storeFile( string fileName );
/**
* returns a file object matching the query
*/
GridFile findFile( BSONObj query );
/**
* equiv to findFile( { filename : filename } )
*/
GridFile findFile( string filename);
/**
* convenience method to get all the files
*/
auto_ptr<DBClientCursor> list();
/**
* convenience method to get all the files with a filter
*/
auto_ptr<DBClientCursor> list( BSONObj query );
private:
DBClientBase& _client;
string _filesNS;
string _chunksNS;
friend class GridFile;
};
/**
wrapper for a file stored in the Mongo database
*/
class GridFile {
public:
/**
* @return whether or not this file exists
* findFile will always return a GriFile, so need to check this
*/
bool exists(){
return ! _obj.isEmpty();
}
string getFilename(){
return _obj["filename"].str();
}
int getChunkSize(){
return (int)(_obj["chunkSize"].number());
}
gridfs_offset getContentLength(){
return (gridfs_offset)(_obj["length"].number());
}
int getNumChunks(){
return (int) ceil( (double)getContentLength() / (double)getChunkSize() );
}
Chunk getChunk( int n );
/**
write the file to the ouput stream
*/
gridfs_offset write( ostream & out );
/**
write the file to this filename
*/
gridfs_offset write( string where );
private:
GridFile( GridFS * grid , BSONObj obj );
void _exists();
GridFS * _grid;
BSONObj _obj;
friend class GridFS;
};
}
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