diff options
Diffstat (limited to 'src/mongo/db/ops/modifier_compare.h')
-rw-r--r-- | src/mongo/db/ops/modifier_compare.h | 135 |
1 files changed, 65 insertions, 70 deletions
diff --git a/src/mongo/db/ops/modifier_compare.h b/src/mongo/db/ops/modifier_compare.h index 8285f3e10ad..f0be887d136 100644 --- a/src/mongo/db/ops/modifier_compare.h +++ b/src/mongo/db/ops/modifier_compare.h @@ -38,73 +38,68 @@ namespace mongo { - class LogBuilder; - - class ModifierCompare : public ModifierInterface { - MONGO_DISALLOW_COPYING(ModifierCompare); - - public: - - enum ModifierCompareMode { MAX, MIN }; - explicit ModifierCompare(ModifierCompareMode mode = MAX); - - virtual ~ModifierCompare(); - - // - // Modifier interface implementation - // - - /** - * A 'modExpr' is a BSONElement {<fieldname>: <value>} coming from a $set mod such as - * {$set: {<fieldname: <value>}}. init() extracts the field name and the value to be - * assigned to it from 'modExpr'. It returns OK if successful or a status describing - * the error. - */ - virtual Status init(const BSONElement& modExpr, const Options& opts, - bool* positional = NULL); - - /** - * Looks up the field name in the sub-tree rooted at 'root', and binds, if necessary, - * the '$' field part using the 'matchedfield' number. prepare() returns OK and - * fills in 'execInfo' with information of whether this mod is a no-op on 'root' and - * whether it is an in-place candidate. Otherwise, returns a status describing the - * error. - */ - virtual Status prepare(mutablebson::Element root, - StringData matchedField, - ExecInfo* execInfo); - - /** - * Applies the prepared mod over the element 'root' specified in the prepare() - * call. Returns OK if successful or a status describing the error. - */ - virtual Status apply() const; - - /** - * Adds a log entry to logRoot corresponding to the operation applied here. Returns OK - * if successful or a status describing the error. - */ - virtual Status log(LogBuilder* logBuilder) const; - - private: - - // Compare mode: min/max - const ModifierCompareMode _mode; - - // Access to each component of fieldName that's the target of this mod. - FieldRef _updatePath; - - // 0 or index for $-positional in _updatePath. - size_t _pathReplacementPosition; - - // Element of the mod expression. - BSONElement _val; - - // The instance of the field in the provided doc. This state is valid after a - // prepare() was issued and until a log() is issued. The document this mod is - // being prepared against must be live throughout all the calls. - struct PreparedState; - std::unique_ptr<PreparedState> _preparedState; - }; - -} // namespace mongo +class LogBuilder; + +class ModifierCompare : public ModifierInterface { + MONGO_DISALLOW_COPYING(ModifierCompare); + +public: + enum ModifierCompareMode { MAX, MIN }; + explicit ModifierCompare(ModifierCompareMode mode = MAX); + + virtual ~ModifierCompare(); + + // + // Modifier interface implementation + // + + /** + * A 'modExpr' is a BSONElement {<fieldname>: <value>} coming from a $set mod such as + * {$set: {<fieldname: <value>}}. init() extracts the field name and the value to be + * assigned to it from 'modExpr'. It returns OK if successful or a status describing + * the error. + */ + virtual Status init(const BSONElement& modExpr, const Options& opts, bool* positional = NULL); + + /** + * Looks up the field name in the sub-tree rooted at 'root', and binds, if necessary, + * the '$' field part using the 'matchedfield' number. prepare() returns OK and + * fills in 'execInfo' with information of whether this mod is a no-op on 'root' and + * whether it is an in-place candidate. Otherwise, returns a status describing the + * error. + */ + virtual Status prepare(mutablebson::Element root, StringData matchedField, ExecInfo* execInfo); + + /** + * Applies the prepared mod over the element 'root' specified in the prepare() + * call. Returns OK if successful or a status describing the error. + */ + virtual Status apply() const; + + /** + * Adds a log entry to logRoot corresponding to the operation applied here. Returns OK + * if successful or a status describing the error. + */ + virtual Status log(LogBuilder* logBuilder) const; + +private: + // Compare mode: min/max + const ModifierCompareMode _mode; + + // Access to each component of fieldName that's the target of this mod. + FieldRef _updatePath; + + // 0 or index for $-positional in _updatePath. + size_t _pathReplacementPosition; + + // Element of the mod expression. + BSONElement _val; + + // The instance of the field in the provided doc. This state is valid after a + // prepare() was issued and until a log() is issued. The document this mod is + // being prepared against must be live throughout all the calls. + struct PreparedState; + std::unique_ptr<PreparedState> _preparedState; +}; + +} // namespace mongo |