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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* 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 Server Side 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 "expression.h"
namespace mongo {
/**
* InclusiveBoundType defines the necessary configuration for inclusively bounded trig functions.
*/
struct InclusiveBoundType {
// We use a static method rather than a field because the value, as an std::string, would need
// to be initialized out of line. This method will be inlined, and result in no overhead.
static std::string leftBracket() {
return "[";
}
static std::string rightBracket() {
return "]";
}
static bool checkUpperBound(double input, double bound) {
return input <= bound;
}
static bool checkUpperBound(Decimal128 input, double bound) {
return input.isLessEqual(Decimal128(bound));
}
static bool checkLowerBound(double input, double bound) {
return input >= bound;
}
static bool checkLowerBound(Decimal128 input, double bound) {
return input.isGreaterEqual(Decimal128(bound));
}
};
/**
* ExclusiveBoundType defines the necessary configuration for exclusively bounded trig functions.
*/
struct ExclusiveBoundType {
// We use a static method rather than a field because the value, as an std::string, would need
// to be initialized out of line. This method will be inlined, and result in no overhead.
static std::string leftBracket() {
return "(";
}
static std::string rightBracket() {
return ")";
}
static bool checkUpperBound(double input, double bound) {
return input < bound;
}
static bool checkUpperBound(Decimal128 input, double bound) {
return input.isLess(Decimal128(bound));
}
static bool checkLowerBound(double input, double bound) {
return input > bound;
}
static bool checkLowerBound(Decimal128 input, double bound) {
return input.isGreater(Decimal128(bound));
}
};
/**
* ExpressionBoundedTrigonometric is the type of all trigonometric functions that take one argument
* and have lower and upper bounds, either inclusive or exclusive, as defined by the BoundType
* template argument.
*/
template <typename BoundedTrigType, typename BoundType>
class ExpressionBoundedTrigonometric : public ExpressionSingleNumericArg<BoundedTrigType> {
public:
explicit ExpressionBoundedTrigonometric(const boost::intrusive_ptr<ExpressionContext>& expCtx)
: ExpressionSingleNumericArg<BoundedTrigType>(expCtx) {}
std::string toString(double d) const {
return str::stream() << d;
}
std::string toString(Decimal128 d) const {
return d.toString();
}
bool isnan(double d) const {
return std::isnan(d);
}
bool isnan(Decimal128 d) const {
return d.isNaN();
}
template <typename T>
bool checkBounds(T input) const {
return BoundType::checkLowerBound(input, getLowerBound()) &&
BoundType::checkUpperBound(input, getUpperBound());
}
/**
* assertBounds uasserts if checkBounds returns false, meaning that the input is out of bounds.
*/
template <typename T>
void assertBounds(T input) const {
uassert(50989,
str::stream() << "cannot apply " << getOpName() << " to " << toString(input)
<< ", value must in " << BoundType::leftBracket() << getLowerBound()
<< "," << getUpperBound() << BoundType::rightBracket(),
checkBounds(input));
}
/**
* evaluateNumericArg evaluates the implented trig function on one numericArg.
*/
Value evaluateNumericArg(const Value& numericArg) const {
switch (numericArg.getType()) {
case BSONType::NumberDouble: {
auto input = numericArg.getDouble();
if (isnan(input)) {
return numericArg;
}
assertBounds(input);
return Value(doubleFunc(input));
}
case BSONType::NumberDecimal: {
auto input = numericArg.getDecimal();
if (isnan(input)) {
return numericArg;
}
assertBounds(input);
return Value(decimalFunc(input));
}
default: {
auto input = static_cast<double>(numericArg.getLong());
if (isnan(input)) {
return numericArg;
}
assertBounds(input);
return Value(doubleFunc(input));
}
}
}
/**
* Since bounds are always either +/-Infinity or integral values, double has enough precision.
*/
virtual double getLowerBound() const = 0;
virtual double getUpperBound() const = 0;
/**
* doubleFunc performs the double version of the implemented trig function, e.g. std::sin()
*/
virtual double doubleFunc(double x) const = 0;
/**
* decimalFunc performs the decimal128 version of the implemented trig function, e.g. d.sin()
*/
virtual Decimal128 decimalFunc(Decimal128 x) const = 0;
/**
* getOpName returns the name of the operation, e.g., $sin
*/
virtual const char* getOpName() const = 0;
};
/**
* ExpressionUnboundedTrigonometric is the type for all trigonometric functions that do not have
* upper or lower bounds.
*/
template <typename TrigType>
class ExpressionUnboundedTrigonometric : public ExpressionSingleNumericArg<TrigType> {
public:
explicit ExpressionUnboundedTrigonometric(const boost::intrusive_ptr<ExpressionContext>& expCtx)
: ExpressionSingleNumericArg<TrigType>(expCtx) {}
/**
* evaluateNumericArg evaluates the implented trig function on one numericArg.
*/
Value evaluateNumericArg(const Value& numericArg) const override {
switch (numericArg.getType()) {
case BSONType::NumberDouble:
return Value(doubleFunc(numericArg.getDouble()));
case BSONType::NumberDecimal:
return Value(decimalFunc(numericArg.getDecimal()));
default: {
auto num = static_cast<double>(numericArg.getLong());
return Value(doubleFunc(num));
}
}
}
/**
* doubleFunc performs the double version of the implemented trig function, e.g. std::sinh()
*/
virtual double doubleFunc(double x) const = 0;
/**
* decimalFunc performs the decimal128 version of the implemented trig function, e.g. d.sinh()
*/
virtual Decimal128 decimalFunc(Decimal128 x) const = 0;
/**
* getOpName returns the name of the operation, e.g., $sinh
*/
virtual const char* getOpName() const = 0;
};
} // namespace mongo
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