node.h

#pragma once
#include "date.h"
#include <string>
#include <memory>
using namespace std;

enum class Comparison
{
	Less,
	LessOrEqual,
	Greater,
	GreaterOrEqual,
	Equal,
	NotEqual,
};

enum class LogicalOperation
{
	And,
	Or,
};

class Node
{
public:
	virtual bool Evaluate(const Date& date_,
		const string& event_) const = 0;
};


class EmptyNode : public Node
{
public:
	bool Evaluate(const Date& date_, const string& event_) const override;
};


class LogicalOperationNode : public Node
{
public:
	LogicalOperationNode(const LogicalOperation& logical_operation,
		const shared_ptr<const Node>& left, const shared_ptr<const Node>& right);

	bool Evaluate(const Date& date_, const string& event_) const override;

private:
	LogicalOperation logical_operation_;
	shared_ptr<const Node> left_node_, right_node_;
};


class DateComparisonNode : public Node
{
public:
	DateComparisonNode(const Comparison& comparator, const Date& date);

	bool Evaluate(const Date& date_, const string& event_) const override;

private:
	const Comparison comparator_;
	const Date self_date_;
};


class EventComparisonNode : public Node
{
public:
	EventComparisonNode(const Comparison& comparator, const string& event_);

	bool Evaluate(const Date& date_, const string& event_) const override;

private:
	const Comparison comparator_;
	const string self_event_;
};