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Conflicts: src/mongo/db/fts/fts_spec.cpp src/mongo/db/fts/fts_spec.h src/mongo/db/fts/fts_spec_test.cpp
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| // fts_iterator.cpp | ||
| /** | ||
| * Copyright (C) 2014 MongoDB Inc. | ||
| * | ||
| * This program is free software: you can redistribute it and/or modify | ||
| * it under the terms of the GNU Affero General Public License, version 3, | ||
| * as published by the Free Software Foundation. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU Affero General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU Affero General Public License | ||
| * along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
| * | ||
| * As a special exception, the copyright holders give permission to link the | ||
| * code of portions of this program with the OpenSSL library under certain | ||
| * conditions as described in each individual source file and distribute | ||
| * linked combinations including the program with the OpenSSL library. You | ||
| * must comply with the GNU Affero General Public License in all respects for | ||
| * all of the code used other than as permitted herein. If you modify file(s) | ||
| * with this exception, you may extend this exception to your version of the | ||
| * file(s), but you are not obligated to do so. If you do not wish to do so, | ||
| * delete this exception statement from your version. If you delete this | ||
| * exception statement from all source files in the program, then also delete | ||
| * it in the license file. | ||
| */ | ||
|
|
||
| #include "mongo/db/fts/fts_iterator.h" | ||
| #include "mongo/db/fts/fts_spec.h" | ||
| #include "mongo/db/fts/fts_util.h" | ||
| #include "mongo/util/mongoutils/str.h" | ||
| #include "mongo/util/stringutils.h" | ||
|
|
||
| #include <stack> | ||
|
|
||
| namespace mongo { | ||
|
|
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| namespace fts { | ||
|
|
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| extern const double DEFAULT_WEIGHT; | ||
| extern const double MAX_WEIGHT; | ||
|
|
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| std::ostream& operator<<( std::ostream& os, FTSElementIterator::FTSIteratorFrame& frame ) { | ||
| BSONObjIterator it = frame._it; | ||
| return os << "FTSIteratorFrame[" | ||
| " element=" << (*it).toString() << | ||
| ", _language=" << frame._language->str() << | ||
| ", _parentPath=" << frame._parentPath << | ||
| ", _isArray=" << frame._isArray << "]"; | ||
| } | ||
|
|
||
| FTSElementIterator::FTSElementIterator( const FTSSpec& spec, const BSONObj& obj ) | ||
| : _frame( obj, spec, &spec.defaultLanguage(), "", false ), | ||
| _spec( spec ), | ||
| _currentValue( advance() ) | ||
| { } | ||
|
|
||
| namespace { | ||
| /** Check for exact match or path prefix match. */ | ||
| inline bool _matchPrefix( const string& dottedName, const string& weight ) { | ||
| if ( weight == dottedName ) { | ||
| return true; | ||
| } | ||
| return mongoutils::str::startsWith( weight, dottedName + '.' ); | ||
| } | ||
| } | ||
|
|
||
| bool FTSElementIterator::more() { | ||
| //_currentValue = advance(); | ||
| return _currentValue.valid(); | ||
| } | ||
|
|
||
| FTSIteratorValue FTSElementIterator::next() { | ||
| FTSIteratorValue result = _currentValue; | ||
| _currentValue = advance(); | ||
| return result; | ||
| } | ||
|
|
||
| /** | ||
| * Helper method: | ||
| * if (current object iterator not exhausted) return true; | ||
| * while (frame stack not empty) { | ||
| * resume object iterator popped from stack; | ||
| * if (resumed iterator not exhausted) return true; | ||
| * } | ||
| * return false; | ||
| */ | ||
| bool FTSElementIterator::moreFrames() { | ||
| if (_frame._it.more()) return true; | ||
| while (!_frameStack.empty()) { | ||
| _frame = _frameStack.top(); | ||
| _frameStack.pop(); | ||
| if (_frame._it.more()) { | ||
| return true; | ||
| } | ||
| } | ||
| return false; | ||
| } | ||
|
|
||
| FTSIteratorValue FTSElementIterator::advance() { | ||
| while ( moreFrames() ) { | ||
|
|
||
| BSONElement elem = _frame._it.next(); | ||
| string fieldName = elem.fieldName(); | ||
|
|
||
| // Skip "language" specifier fields if wildcard. | ||
| if ( _spec.wildcard() && _spec.languageOverrideField() == fieldName ) { | ||
| continue; | ||
| } | ||
|
|
||
| // Compose the dotted name of the current field: | ||
| // 1. parent path empty (top level): use the current field name | ||
| // 2. parent path non-empty and obj is an array: use the parent path | ||
| // 3. parent path non-empty and obj is a sub-doc: append field name to parent path | ||
| string dottedName = ( _frame._parentPath.empty() ? fieldName | ||
| : _frame._isArray ? _frame._parentPath | ||
| : _frame._parentPath + '.' + fieldName ); | ||
|
|
||
| // Find lower bound of dottedName in _weights. lower_bound leaves us at the first | ||
| // weight that could possibly match or be a prefix of dottedName. And if this | ||
| // element fails to match, then no subsequent weight can match, since the weights | ||
| // are lexicographically ordered. | ||
| Weights::const_iterator i = _spec.weights().lower_bound( elem.type() == Object | ||
| ? dottedName + '.' | ||
| : dottedName ); | ||
|
|
||
| // possibleWeightMatch is set if the weight map contains either a match or some item | ||
| // lexicographically larger than fieldName. This boolean acts as a guard on | ||
| // dereferences of iterator 'i'. | ||
| bool possibleWeightMatch = ( i != _spec.weights().end() ); | ||
|
|
||
| // Optimize away two cases, when not wildcard: | ||
| // 1. lower_bound seeks to end(): no prefix match possible | ||
| // 2. lower_bound seeks to a name which is not a prefix | ||
| if ( !_spec.wildcard() ) { | ||
| if ( !possibleWeightMatch ) { | ||
| continue; | ||
| } | ||
| else if ( !_matchPrefix( dottedName, i->first ) ) { | ||
| continue; | ||
| } | ||
| } | ||
|
|
||
| // Is the current field an exact match on a weight? | ||
| bool exactMatch = ( possibleWeightMatch && i->first == dottedName ); | ||
| double weight = ( possibleWeightMatch ? i->second : DEFAULT_WEIGHT ); | ||
|
|
||
| switch ( elem.type() ) { | ||
| case String: | ||
| // Only index strings on exact match or wildcard. | ||
| if ( exactMatch || _spec.wildcard() ) { | ||
| return FTSIteratorValue( elem.valuestr(), _frame._language, weight ); | ||
| } | ||
| break; | ||
|
|
||
| case Object: | ||
| // Only descend into a sub-document on proper prefix or wildcard. Note that | ||
| // !exactMatch is a sufficient test for proper prefix match, because of | ||
| // if ( !matchPrefix( dottedName, i->first ) ) continue; | ||
| // block above. | ||
| if ( !exactMatch || _spec.wildcard() ) { | ||
| _frameStack.push( _frame ); | ||
| _frame = FTSIteratorFrame( elem.Obj(), _spec, _frame._language, dottedName, false ); | ||
| } | ||
| break; | ||
|
|
||
| case Array: | ||
| // Only descend into arrays from non-array parents or on wildcard. | ||
| if ( !_frame._isArray || _spec.wildcard() ) { | ||
| _frameStack.push( _frame ); | ||
| _frame = FTSIteratorFrame( elem.Obj(), _spec, _frame._language, dottedName, true ); | ||
| } | ||
| break; | ||
|
|
||
| default: | ||
| // Skip over all other BSON types. | ||
| break; | ||
| } | ||
| } | ||
| return FTSIteratorValue(); // valid()==false | ||
| } | ||
|
|
||
| } // namespace fts | ||
| } // namespace mongo |
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