Position DocumentStorage::findField(StringData requested) const {
int reqSize = requested.size(); // get size calculation out of the way if needed
if (_numFields >= HASH_TAB_MIN) { // hash lookup
const unsigned bucket = bucketForKey(requested);
Position pos = _hashTab[bucket];
while (pos.found()) {
const ValueElement& elem = getField(pos);
if (elem.nameLen == reqSize
&& memcmp(requested.rawData(), elem._name, reqSize) == 0) {
return pos;
}
// possible collision
pos = elem.nextCollision;
}
}
else { // linear scan
for (DocumentStorageIterator it = iteratorAll(); !it.atEnd(); it.advance()) {
if (it->nameLen == reqSize
&& memcmp(requested.rawData(), it->_name, reqSize) == 0) {
return it.position();
}
}
}
// if we got here, there's no such field
return Position();
}
DocumentStorage::~DocumentStorage() {
boost::scoped_array<char> deleteBufferAtScopeEnd (_buffer);
for (DocumentStorageIterator it = iteratorAll(); !it.atEnd(); it.advance()) {
it->val.~Value(); // explicit destructor call
}
}
void Document::hash_combine(size_t &seed) const {
for (DocumentStorageIterator it = storage().iterator(); !it.atEnd(); it.advance()) {
StringData name = it->nameSD();
boost::hash_range(seed, name.rawData(), name.rawData() + name.size());
it->val.hash_combine(seed);
}
}
DocumentStorage::~DocumentStorage() {
std::unique_ptr<char[]> deleteBufferAtScopeEnd(_buffer);
for (DocumentStorageIterator it = iteratorAll(); !it.atEnd(); it.advance()) {
it->val.~Value(); // explicit destructor call
}
}
intrusive_ptr<DocumentStorage> DocumentStorage::clone() const {
intrusive_ptr<DocumentStorage> out(new DocumentStorage());
// Make a copy of the buffer.
// It is very important that the positions of each field are the same after cloning.
const size_t bufferBytes = allocatedBytes();
out->_buffer = new char[bufferBytes];
out->_bufferEnd = out->_buffer + (_bufferEnd - _buffer);
if (bufferBytes > 0) {
memcpy(out->_buffer, _buffer, bufferBytes);
}
// Copy remaining fields
out->_usedBytes = _usedBytes;
out->_numFields = _numFields;
out->_hashTabMask = _hashTabMask;
out->_metaFields = _metaFields;
out->_textScore = _textScore;
out->_randVal = _randVal;
out->_sortKey = _sortKey.getOwned();
// Tell values that they have been memcpyed (updates ref counts)
for (DocumentStorageIterator it = out->iteratorAll(); !it.atEnd(); it.advance()) {
it->val.memcpyed();
}
return out;
}
Position DocumentStorage::findField(StringData requested) const {
if (_numFields >= HASH_TAB_MIN) { // hash lookup
const unsigned bucket = bucketForKey(requested);
Position pos = _hashTab[bucket];
while (pos.found()) {
const ValueElement& elem = getField(pos);
if (requested == elem.nameSD())
return pos;
// possible collision
pos = elem.nextCollision;
}
}
else if (_numFields) { // linear scan
for (DocumentStorageIterator it = iteratorAll(); !it.atEnd(); it.advance()) {
if (size_t(it->nameLen) == requested.size()
&& requested == it->nameSD()) {
return it.position();
}
}
}
// if we got here, there's no such field
return Position();
}
void Document::serializeForSorter(BufBuilder& buf) const {
const int numElems = size();
buf.appendNum(numElems);
for (DocumentStorageIterator it = storage().iterator(); !it.atEnd(); it.advance()) {
buf.appendStr(it->nameSD(), /*NUL byte*/ true);
it->val.serializeForSorter(buf);
}
}
int Document::compare(const Document& rL, const Document& rR) {
DocumentStorageIterator lIt = rL.storage().iterator();
DocumentStorageIterator rIt = rR.storage().iterator();
while (true) {
if (lIt.atEnd()) {
if (rIt.atEnd())
return 0; // documents are the same length
return -1; // left document is shorter
}
if (rIt.atEnd())
return 1; // right document is shorter
const ValueElement& rField = rIt.get();
const ValueElement& lField = lIt.get();
const int nameCmp = lField.nameSD().compare(rField.nameSD());
if (nameCmp)
return nameCmp; // field names are unequal
const int valueCmp = Value::compare(lField.val, rField.val);
if (valueCmp)
return valueCmp; // fields are unequal
rIt.advance();
lIt.advance();
}
}
void Document::toBson(BSONObjBuilder* builder, size_t recursionLevel) const {
uassert(ErrorCodes::Overflow,
str::stream() << "cannot convert document to BSON because it exceeds the limit of "
<< BSONDepth::getMaxAllowableDepth()
<< " levels of nesting",
recursionLevel <= BSONDepth::getMaxAllowableDepth());
for (DocumentStorageIterator it = storage().iterator(); !it.atEnd(); it.advance()) {
it->val.addToBsonObj(builder, it->nameSD(), recursionLevel);
}
}
size_t Document::getApproximateSize() const {
if (!_storage)
return 0; // we've allocated no memory
size_t size = sizeof(DocumentStorage);
size += storage().allocatedBytes();
for (DocumentStorageIterator it = storage().iterator(); !it.atEnd(); it.advance()) {
size += it->val.getApproximateSize();
size -= sizeof(Value); // already accounted for above
}
return size;
}
string Document::toString() const {
if (empty())
return "{}";
StringBuilder out;
const char* prefix = "{";
for (DocumentStorageIterator it = storage().iterator(); !it.atEnd(); it.advance()) {
out << prefix << it->nameSD() << ": " << it->val.toString();
prefix = ", ";
}
out << '}';
return out.str();
}
void Document::serializeForSorter(BufBuilder& buf) const {
const int numElems = size();
buf.appendNum(numElems);
for (DocumentStorageIterator it = storage().iterator(); !it.atEnd(); it.advance()) {
buf.appendStr(it->nameSD(), /*NUL byte*/ true);
it->val.serializeForSorter(buf);
}
if (hasTextScore()) {
buf.appendNum(char(DocumentStorage::MetaType::TEXT_SCORE + 1));
buf.appendNum(getTextScore());
}
if (hasRandMetaField()) {
buf.appendNum(char(DocumentStorage::MetaType::RAND_VAL + 1));
buf.appendNum(getRandMetaField());
}
buf.appendNum(char(0));
}
int Document::compare(const Document& rL,
const Document& rR,
const StringData::ComparatorInterface* stringComparator) {
DocumentStorageIterator lIt = rL.storage().iterator();
DocumentStorageIterator rIt = rR.storage().iterator();
while (true) {
if (lIt.atEnd()) {
if (rIt.atEnd())
return 0; // documents are the same length
return -1; // left document is shorter
}
if (rIt.atEnd())
return 1; // right document is shorter
const ValueElement& rField = rIt.get();
const ValueElement& lField = lIt.get();
// For compatibility with BSONObj::woCompare() consider the canonical type of values
// before considerting their names.
if (lField.val.getType() != rField.val.getType()) {
const int rCType = canonicalizeBSONType(rField.val.getType());
const int lCType = canonicalizeBSONType(lField.val.getType());
if (lCType != rCType)
return lCType < rCType ? -1 : 1;
}
const int nameCmp = lField.nameSD().compare(rField.nameSD());
if (nameCmp)
return nameCmp; // field names are unequal
const int valueCmp = Value::compare(lField.val, rField.val, stringComparator);
if (valueCmp)
return valueCmp; // fields are unequal
rIt.advance();
lIt.advance();
}
}
void Document::toBson(BSONObjBuilder* pBuilder) const {
for (DocumentStorageIterator it = storage().iterator(); !it.atEnd(); it.advance()) {
*pBuilder << it->nameSD() << it->val;
}
}
