mirrors/mongodb
mirrors/mongodb
0
0
Fork 0
mirror of https://github.com/mongodb/mongo.git synced 2024-12-01 09:32:32 +01:00
Code Issues Releases Activity

Use non-copying subobject builder in json parser

Browse Source
This commit is contained in:
Aaron 2009-03-25 18:47:03 -04:00
parent e5a43008fd
commit 8c6865b911
2 changed files with 43 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
db/jsobj.h
View File

@ -841,6 +841,8 @@ namespace mongo {
b.append((void *) subObj.objdata(), subObj.objsize());
}
/** add header for a new subobject and return bufbuilder for writing to
the subobject's body */
BufBuilder &subobjStart(const char *fieldName) {
b.append((char) Object);
b.append(fieldName);
@ -856,6 +858,14 @@ namespace mongo {
b.append((void *) subObj.objdata(), subObj.objsize());
}
/** add header for a new subarray and return bufbuilder for writing to
the subarray's body */
BufBuilder &subarrayStart(const char *fieldName) {
b.append((char) Array);
b.append(fieldName);
return b;
}
/** Append a boolean element */
void appendBool(const char *fieldName, int val) {
b.append((char) Bool);
@ -1051,6 +1061,7 @@ namespace mongo {
/** The returned BSONObj will free the buffer when it is finished. */
BSONObj obj() {
massert( "builder does not own memory", owned() );
int l;
return BSONObj(decouple(l), true);
}
@ -1098,6 +1109,10 @@ namespace mongo {
return s_ << l;
}
bool owned() const {
return &b == &buf_;
}
private:
// Append the provided arr object as an array.
void marshalArray( const char *fieldName, const BSONObj &arr ) {

36
db/json.cpp
View File

@ -32,14 +32,33 @@ namespace mongo {
const char *fieldName() {
return fieldNames.back().c_str();
}
void push() {
bool empty() const {
return builders.size() == 0;
}
void init() {
boost::shared_ptr< BSONObjBuilder > b( new BSONObjBuilder() );
builders.push_back( b );
fieldNames.push_back( "" );
indexes.push_back( 0 );
}
void pushObject( const char *fieldName ) {
boost::shared_ptr< BSONObjBuilder > b( new BSONObjBuilder( builders.back()->subobjStart( fieldName ) ) );
builders.push_back( b );
fieldNames.push_back( "" );
indexes.push_back( 0 );
}
void pushArray( const char *fieldName ) {
boost::shared_ptr< BSONObjBuilder > b( new BSONObjBuilder( builders.back()->subarrayStart( fieldName ) ) );
builders.push_back( b );
fieldNames.push_back( "" );
indexes.push_back( 0 );
}
BSONObj pop() {
BSONObj ret = back()->obj();
BSONObj ret;
if ( back()->owned() )
ret = back()->obj();
else
ret = back()->done();
builders.pop_back();
fieldNames.pop_back();
indexes.pop_back();
@ -70,7 +89,10 @@ namespace mongo {
struct objectStart {
objectStart( ObjectBuilder &_b ) : b( _b ) {}
void operator() ( const char &c ) const {
b.push();
if ( b.empty() )
b.init();
else
b.pushObject( b.fieldName() );
}
ObjectBuilder &b;
};
@ -78,7 +100,7 @@ namespace mongo {
struct arrayStart {
arrayStart( ObjectBuilder &_b ) : b( _b ) {}
void operator() ( const char &c ) const {
b.push();
b.pushArray( b.fieldName() );
b.nameFromIndex();
}
ObjectBuilder &b;
@ -229,8 +251,7 @@ namespace mongo {
struct subobjectEnd {
subobjectEnd( ObjectBuilder &_b ) : b( _b ) {}
void operator() ( const char *start, const char *end ) const {
BSONObj o = b.pop();
b.back()->append( b.fieldName(), o );
b.pop();
}
ObjectBuilder &b;
};
@ -238,8 +259,7 @@ namespace mongo {
struct arrayEnd {
arrayEnd( ObjectBuilder &_b ) : b( _b ) {}
void operator() ( const char *start, const char *end ) const {
BSONObj o = b.pop();
b.back()->appendArray( b.fieldName(), o );
b.pop();
}
ObjectBuilder &b;
};