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// expression_tree.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 "mongo/db/matcher/expression.h"
/**
* this contains all Expessions that define the structure of the tree
* they do not look at the structure of the documents themselves, just combine other things
*/
namespace mongo {
class ListOfMatchExpression : public MatchExpression {
public:
ListOfMatchExpression(MatchType type) : MatchExpression(type) {}
virtual ~ListOfMatchExpression();
/**
* @param e - I take ownership
*/
void add(MatchExpression* e);
/**
* clears all the thingsd we own, and does NOT delete
* someone else has taken ownership
*/
void clearAndRelease() {
_expressions.clear();
}
virtual size_t numChildren() const {
return _expressions.size();
}
virtual MatchExpression* getChild(size_t i) const {
return _expressions[i];
}
/*
* Replaces the ith child with nullptr, and releases ownership of the child.
*/
virtual std::unique_ptr<MatchExpression> releaseChild(size_t i) {
auto child = std::unique_ptr<MatchExpression>(_expressions[i]);
_expressions[i] = nullptr;
return child;
}
/*
* Removes the ith child, and releases ownership of the child.
*/
virtual std::unique_ptr<MatchExpression> removeChild(size_t i) {
auto child = std::unique_ptr<MatchExpression>(_expressions[i]);
_expressions.erase(_expressions.begin() + i);
return child;
}
virtual std::vector<MatchExpression*>* getChildVector() {
return &_expressions;
}
bool equivalent(const MatchExpression* other) const;
protected:
void _debugList(StringBuilder& debug, int level) const;
void _listToBSON(BSONArrayBuilder* out) const;
private:
std::vector<MatchExpression*> _expressions;
};
class AndMatchExpression : public ListOfMatchExpression {
public:
AndMatchExpression() : ListOfMatchExpression(AND) {}
virtual ~AndMatchExpression() {}
virtual bool matches(const MatchableDocument* doc, MatchDetails* details = 0) const;
virtual bool matchesSingleElement(const BSONElement& e) const;
virtual std::unique_ptr<MatchExpression> shallowClone() const {
std::unique_ptr<AndMatchExpression> self = stdx::make_unique<AndMatchExpression>();
for (size_t i = 0; i < numChildren(); ++i) {
self->add(getChild(i)->shallowClone().release());
}
if (getTag()) {
self->setTag(getTag()->clone());
}
return std::move(self);
}
virtual void debugString(StringBuilder& debug, int level = 0) const;
virtual void serialize(BSONObjBuilder* out) const;
};
class OrMatchExpression : public ListOfMatchExpression {
public:
OrMatchExpression() : ListOfMatchExpression(OR) {}
virtual ~OrMatchExpression() {}
virtual bool matches(const MatchableDocument* doc, MatchDetails* details = 0) const;
virtual bool matchesSingleElement(const BSONElement& e) const;
virtual std::unique_ptr<MatchExpression> shallowClone() const {
std::unique_ptr<OrMatchExpression> self = stdx::make_unique<OrMatchExpression>();
for (size_t i = 0; i < numChildren(); ++i) {
self->add(getChild(i)->shallowClone().release());
}
if (getTag()) {
self->setTag(getTag()->clone());
}
return std::move(self);
}
virtual void debugString(StringBuilder& debug, int level = 0) const;
virtual void serialize(BSONObjBuilder* out) const;
};
class NorMatchExpression : public ListOfMatchExpression {
public:
NorMatchExpression() : ListOfMatchExpression(NOR) {}
virtual ~NorMatchExpression() {}
virtual bool matches(const MatchableDocument* doc, MatchDetails* details = 0) const;
virtual bool matchesSingleElement(const BSONElement& e) const;
virtual std::unique_ptr<MatchExpression> shallowClone() const {
std::unique_ptr<NorMatchExpression> self = stdx::make_unique<NorMatchExpression>();
for (size_t i = 0; i < numChildren(); ++i) {
self->add(getChild(i)->shallowClone().release());
}
if (getTag()) {
self->setTag(getTag()->clone());
}
return std::move(self);
}
virtual void debugString(StringBuilder& debug, int level = 0) const;
virtual void serialize(BSONObjBuilder* out) const;
};
class NotMatchExpression : public MatchExpression {
public:
NotMatchExpression() : MatchExpression(NOT) {}
NotMatchExpression(MatchExpression* e) : MatchExpression(NOT), _exp(e) {}
/**
* @param exp - I own it, and will delete
*/
virtual Status init(MatchExpression* exp) {
_exp.reset(exp);
return Status::OK();
}
virtual std::unique_ptr<MatchExpression> shallowClone() const {
std::unique_ptr<NotMatchExpression> self = stdx::make_unique<NotMatchExpression>();
self->init(_exp->shallowClone().release()).transitional_ignore();
if (getTag()) {
self->setTag(getTag()->clone());
}
return std::move(self);
}
virtual bool matches(const MatchableDocument* doc, MatchDetails* details = 0) const {
return !_exp->matches(doc, NULL);
}
virtual bool matchesSingleElement(const BSONElement& e) const {
return !_exp->matchesSingleElement(e);
}
virtual void debugString(StringBuilder& debug, int level = 0) const;
virtual void serialize(BSONObjBuilder* out) const;
bool equivalent(const MatchExpression* other) const;
virtual size_t numChildren() const {
return 1;
}
virtual MatchExpression* getChild(size_t i) const {
return _exp.get();
}
MatchExpression* releaseChild(void) {
return _exp.release();
}
void resetChild(MatchExpression* newChild) {
_exp.reset(newChild);
}
private:
std::unique_ptr<MatchExpression> _exp;
};
}
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