file.h

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#ifndef AR_FILE_H
#define AR_FILE_H

#include <memory>
#include <string>
#include <vector>

namespace ar {

class File {
public:
    virtual ~File() = 0;

    virtual std::string getName() const = 0;
    virtual std::string getContent() = 0;
    virtual void saveCopyTo(const std::string& directoryPath) = 0;
    virtual void saveCopyTo(const std::string& directoryPath,
        const std::string& name) = 0;

    static std::unique_ptr<File> fromContentWithName(
        const std::string& content, const std::string& name);
    static std::unique_ptr<File> fromFilesystem(const std::string& path);
    static std::unique_ptr<File> fromFilesystemWithOtherName(
        const std::string& path, const std::string& name);

    File(const File&) = delete;
    File(File&&) = delete;
    File& operator=(const File&) = delete;
    File& operator=(File&&) = delete;

protected:
    File();
};

class Files {
private:
    using Container = std::vector<std::unique_ptr<File>>;

public:
    using size_type = Container::size_type;
    using value_type = Container::value_type;
    using reference = Container::reference;
    using iterator = Container::iterator;

public:
    Files();
    Files(Files&& other);
    ~Files();

    reference front();
    reference back();

    iterator begin() noexcept;
    iterator end() noexcept;

    bool empty() const noexcept;
    size_type size() const noexcept;

    void push_back(value_type file);

private:
    Container files;
};

} // namespace ar

#endif