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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.h"
#include "mongo/db/matcher/expression_leaf.h"
namespace mongo {
class ArrayMatchingMatchExpression : public MatchExpression {
public:
ArrayMatchingMatchExpression(MatchType matchType) : MatchExpression(matchType) {}
virtual ~ArrayMatchingMatchExpression() {}
Status setPath(StringData path);
virtual bool matches(const MatchableDocument* doc, MatchDetails* details) const;
/**
* @param e - has to be an array. calls matchesArray with e as an array
*/
virtual bool matchesSingleElement(const BSONElement& e) const;
virtual bool matchesArray(const BSONObj& anArray, MatchDetails* details) const = 0;
bool equivalent(const MatchExpression* other) const;
const StringData path() const {
return _path;
}
private:
StringData _path;
ElementPath _elementPath;
};
class ElemMatchObjectMatchExpression : public ArrayMatchingMatchExpression {
public:
ElemMatchObjectMatchExpression() : ArrayMatchingMatchExpression(ELEM_MATCH_OBJECT) {}
Status init(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>();
e->init(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;
virtual size_t numChildren() const {
return 1;
}
virtual MatchExpression* getChild(size_t i) const {
return _sub.get();
}
private:
std::unique_ptr<MatchExpression> _sub;
};
class ElemMatchValueMatchExpression : public ArrayMatchingMatchExpression {
public:
ElemMatchValueMatchExpression() : ArrayMatchingMatchExpression(ELEM_MATCH_VALUE) {}
virtual ~ElemMatchValueMatchExpression();
Status init(StringData path);
Status init(StringData path, MatchExpression* sub);
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>();
e->init(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:
bool _arrayElementMatchesAll(const BSONElement& e) const;
std::vector<MatchExpression*> _subs;
};
class SizeMatchExpression : public ArrayMatchingMatchExpression {
public:
SizeMatchExpression() : ArrayMatchingMatchExpression(SIZE) {}
Status init(StringData path, int size);
virtual std::unique_ptr<MatchExpression> shallowClone() const {
std::unique_ptr<SizeMatchExpression> e = stdx::make_unique<SizeMatchExpression>();
e->init(path(), _size);
if (getTag()) {
e->setTag(getTag()->clone());
}
return std::move(e);
}
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:
int _size; // >= 0 real, < 0, nothing will match
};
}
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