Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
Fetching contributors…

Cannot retrieve contributors at this time

93 lines (82 sloc) 3.341 kb
// embedded_builder.h
/* Copyright 2009 10gen Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
namespace mongo {
// utility class for assembling hierarchical objects
class EmbeddedBuilder {
public:
EmbeddedBuilder( BSONObjBuilder *b ) {
_builders.push_back( make_pair( "", b ) );
}
// It is assumed that the calls to prepareContext will be made with the 'name'
// parameter in lex ascending order.
void prepareContext( string &name ) {
int i = 1, n = _builders.size();
while( i < n &&
name.substr( 0, _builders[ i ].first.length() ) == _builders[ i ].first &&
( name[ _builders[i].first.length() ] == '.' || name[ _builders[i].first.length() ] == 0 )
){
name = name.substr( _builders[ i ].first.length() + 1 );
++i;
}
for( int j = n - 1; j >= i; --j ) {
popBuilder();
}
for( string next = splitDot( name ); !next.empty(); next = splitDot( name ) ) {
addBuilder( next );
}
}
void appendAs( const BSONElement &e, string name ) {
if ( e.type() == Object && e.valuesize() == 5 ) { // empty object -- this way we can add to it later
string dummyName = name + ".foo";
prepareContext( dummyName );
return;
}
prepareContext( name );
back()->appendAs( e, name );
}
BufBuilder &subarrayStartAs( string name ) {
prepareContext( name );
return back()->subarrayStart( name.c_str() );
}
void done() {
while( ! _builderStorage.empty() )
popBuilder();
}
static string splitDot( string & str ) {
size_t pos = str.find( '.' );
if ( pos == string::npos )
return "";
string ret = str.substr( 0, pos );
str = str.substr( pos + 1 );
return ret;
}
private:
void addBuilder( const string &name ) {
shared_ptr< BSONObjBuilder > newBuilder( new BSONObjBuilder( back()->subobjStart( name.c_str() ) ) );
_builders.push_back( make_pair( name, newBuilder.get() ) );
_builderStorage.push_back( newBuilder );
}
void popBuilder() {
back()->done();
_builders.pop_back();
_builderStorage.pop_back();
}
BSONObjBuilder *back() { return _builders.back().second; }
vector< pair< string, BSONObjBuilder * > > _builders;
vector< shared_ptr< BSONObjBuilder > > _builderStorage;
};
} //namespace mongo
Jump to Line
Something went wrong with that request. Please try again.