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// expression_array.h
/**
* Copyright (C) 2013 10gen 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.
*/
#pragma once
#include <vector>
#include "mongo/base/status.h"
#include "mongo/bson/bsonmisc.h"
#include "mongo/bson/bsonobj.h"
#include "mongo/db/matcher/expression_path.h"
namespace mongo {
/**
* A path match expression which does not expand arrays at the end of the path, and which only
* matches if the path contains an array.
*/
class ArrayMatchingMatchExpression : public PathMatchExpression {
public:
ArrayMatchingMatchExpression(MatchType matchType, StringData path)
: PathMatchExpression(matchType,
path,
ElementPath::LeafArrayBehavior::kNoTraversal,
ElementPath::NonLeafArrayBehavior::kTraverse) {}
virtual ~ArrayMatchingMatchExpression() {}
/**
* Returns whether or not the nested array, represented as the object 'anArray', matches.
*
* 'anArray' must be the nested array at this expression's path.
*/
virtual bool matchesArray(const BSONObj& anArray, MatchDetails* details) const = 0;
bool matchesSingleElement(const BSONElement&, MatchDetails* details = nullptr) const final;
bool equivalent(const MatchExpression* other) const override;
MatchCategory getCategory() const final {
return MatchCategory::kArrayMatching;
}
};
class ElemMatchObjectMatchExpression : public ArrayMatchingMatchExpression {
public:
ElemMatchObjectMatchExpression(StringData path, MatchExpression* sub);
bool matchesArray(const BSONObj& anArray, MatchDetails* details) const;
virtual std::unique_ptr<MatchExpression> shallowClone() const {
std::unique_ptr<ElemMatchObjectMatchExpression> e =
stdx::make_unique<ElemMatchObjectMatchExpression>(path(),
_sub->shallowClone().release());
if (getTag()) {
e->setTag(getTag()->clone());
}
return std::move(e);
}
virtual void debugString(StringBuilder& debug, int level) const;
virtual void serialize(BSONObjBuilder* out) const;
std::vector<MatchExpression*>* getChildVector() final {
return nullptr;
}
virtual size_t numChildren() const {
return 1;
}
virtual MatchExpression* getChild(size_t i) const {
return _sub.get();
}
std::unique_ptr<MatchExpression> releaseChild() {
return std::move(_sub);
}
void resetChild(std::unique_ptr<MatchExpression> newChild) {
_sub = std::move(newChild);
}
private:
ExpressionOptimizerFunc getOptimizer() const final;
std::unique_ptr<MatchExpression> _sub;
};
class ElemMatchValueMatchExpression : public ArrayMatchingMatchExpression {
public:
/**
* This constructor takes ownership of 'sub.'
*/
ElemMatchValueMatchExpression(StringData path, MatchExpression* sub);
explicit ElemMatchValueMatchExpression(StringData path);
virtual ~ElemMatchValueMatchExpression();
void add(MatchExpression* sub);
bool matchesArray(const BSONObj& anArray, MatchDetails* details) const;
virtual std::unique_ptr<MatchExpression> shallowClone() const {
std::unique_ptr<ElemMatchValueMatchExpression> e =
stdx::make_unique<ElemMatchValueMatchExpression>(path());
for (size_t i = 0; i < _subs.size(); ++i) {
e->add(_subs[i]->shallowClone().release());
}
if (getTag()) {
e->setTag(getTag()->clone());
}
return std::move(e);
}
virtual void debugString(StringBuilder& debug, int level) const;
virtual void serialize(BSONObjBuilder* out) const;
virtual std::vector<MatchExpression*>* getChildVector() {
return &_subs;
}
virtual size_t numChildren() const {
return _subs.size();
}
virtual MatchExpression* getChild(size_t i) const {
return _subs[i];
}
private:
ExpressionOptimizerFunc getOptimizer() const final;
bool _arrayElementMatchesAll(const BSONElement& e) const;
std::vector<MatchExpression*> _subs;
};
class SizeMatchExpression : public ArrayMatchingMatchExpression {
public:
SizeMatchExpression(StringData path, int size);
virtual std::unique_ptr<MatchExpression> shallowClone() const {
std::unique_ptr<SizeMatchExpression> e =
stdx::make_unique<SizeMatchExpression>(path(), _size);
if (getTag()) {
e->setTag(getTag()->clone());
}
return std::move(e);
}
size_t numChildren() const override {
return 0;
}
MatchExpression* getChild(size_t i) const override {
return nullptr;
}
std::vector<MatchExpression*>* getChildVector() final {
return nullptr;
}
virtual bool matchesArray(const BSONObj& anArray, MatchDetails* details) const;
virtual void debugString(StringBuilder& debug, int level) const;
virtual void serialize(BSONObjBuilder* out) const;
virtual bool equivalent(const MatchExpression* other) const;
int getData() const {
return _size;
}
private:
virtual ExpressionOptimizerFunc getOptimizer() const final {
return [](std::unique_ptr<MatchExpression> expression) { return expression; };
}
int _size; // >= 0 real, < 0, nothing will match
};
}
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