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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
/**
* @class document::ArithmeticValueUpdate
* @ingroup document
*
* @brief Represent an update that specifies an arithmetic operation that is to
* be applied to the weight of a field value.
*/
#pragma once
#include "valueupdate.h"
namespace document {
class ArithmeticValueUpdate final : public ValueUpdate {
public:
/** Declare all types of arithmetic value updates. */
enum Operator {
Add = 0, // Add the operand to the field value.
Div, // Divide the field value with the operand.
Mul, // Multiply the field value with the operand.
Sub, // Subtract the operand from the field value.
MAX_NUM_OPERATORS
};
private:
Operator _operator; // The operator of the arithmetic operation.
double _operand; // The operand of the arithmetic operation.
// Used by ValueUpdate's static factory function
// Private because it generates an invalid object.
friend class ValueUpdate;
ArithmeticValueUpdate()
: ValueUpdate(Arithmetic),
_operator(MAX_NUM_OPERATORS),
_operand(0.0) {}
ACCEPT_UPDATE_VISITOR;
public:
using UP = std::unique_ptr<ArithmeticValueUpdate>;
/**
* The default constructor requires initial values for all member variables.
*
* @param opt The operator of this arithmetic update.
* @param opn The operand for the operation.
*/
ArithmeticValueUpdate(Operator opt, double opn)
: ValueUpdate(Arithmetic),
_operator(opt),
_operand(opn) {}
ArithmeticValueUpdate(const ArithmeticValueUpdate& update) = delete;
ArithmeticValueUpdate &operator=(const ArithmeticValueUpdate &rhs) = delete;
bool operator==(const ValueUpdate& other) const override;
Operator getOperator() const { return _operator; }
double getOperand() const { return _operand; }
/**
* Apply the contained operation on the given double.
*
* @param value The value to modify.
* @return The modified value.
*/
double applyTo(double value) const;
/**
* Apply the contained operation on the given string.
*
* @param value The value to modify.
* @return The modified value.
*/
std::string applyTo(const std::string& value) const;
/**
* Apply the contained operation on the given long.
*
* @param value The value to modify.
* @return The modified value.
*/
long applyTo(int64_t value) const;
void checkCompatibility(const Field& field) const override;
bool applyTo(FieldValue& value) const override;
void printXml(XmlOutputStream& xos) const override;
void print(std::ostream& out, bool verbose, const std::string& indent) const override;
void deserialize(const DocumentTypeRepo& repo, const DataType& type, nbostream & buffer) override;
};
} // document
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