PropertyStream.h

#ifndef BEAST_UTILITY_PROPERTYSTREAM_H_INCLUDED
#define BEAST_UTILITY_PROPERTYSTREAM_H_INCLUDED
 
#include <xrpl/beast/core/List.h>
 
#include <mutex>
#include <sstream>
#include <string>
 
namespace beast {
 
//------------------------------------------------------------------------------
 
class PropertyStream
{
public:
    class Map;
    class Set;
    class Source;
 
    PropertyStream() = default;
    virtual ~PropertyStream() = default;
 
protected:
    virtual void
    map_begin() = 0;
    virtual void
    map_begin(std::string const& key) = 0;
    virtual void
    map_end() = 0;
 
    virtual void
    add(std::string const& key, std::string const& value) = 0;
 
    void
    add(std::string const& key, char const* value)
    {
        add(key, std::string(value));
    }
 
    template <typename Value>
    void
    lexical_add(std::string const& key, Value value)
    {
        std::stringstream ss;
        ss << value;
        add(key, ss.str());
    }
 
    virtual void
    add(std::string const& key, bool value);
    virtual void
    add(std::string const& key, char value);
    virtual void
    add(std::string const& key, signed char value);
    virtual void
    add(std::string const& key, unsigned char value);
    virtual void
    add(std::string const& key, short value);
    virtual void
    add(std::string const& key, unsigned short value);
    virtual void
    add(std::string const& key, int value);
    virtual void
    add(std::string const& key, unsigned int value);
    virtual void
    add(std::string const& key, long value);
    virtual void
    add(std::string const& key, unsigned long value);
    virtual void
    add(std::string const& key, long long value);
    virtual void
    add(std::string const& key, unsigned long long value);
    virtual void
    add(std::string const& key, float value);
    virtual void
    add(std::string const& key, double value);
    virtual void
    add(std::string const& key, long double value);
 
    virtual void
    array_begin() = 0;
    virtual void
    array_begin(std::string const& key) = 0;
    virtual void
    array_end() = 0;
 
    virtual void
    add(std::string const& value) = 0;
 
    void
    add(char const* value)
    {
        add(std::string(value));
    }
 
    template <typename Value>
    void
    lexical_add(Value value)
    {
        std::stringstream ss;
        ss << value;
        add(ss.str());
    }
 
    virtual void
    add(bool value);
    virtual void
    add(char value);
    virtual void
    add(signed char value);
    virtual void
    add(unsigned char value);
    virtual void
    add(short value);
    virtual void
    add(unsigned short value);
    virtual void
    add(int value);
    virtual void
    add(unsigned int value);
    virtual void
    add(long value);
    virtual void
    add(unsigned long value);
    virtual void
    add(long long value);
    virtual void
    add(unsigned long long value);
    virtual void
    add(float value);
    virtual void
    add(double value);
    virtual void
    add(long double value);
 
private:
    class Item;
    class Proxy;
};
 
//------------------------------------------------------------------------------
//
// Item
//
//------------------------------------------------------------------------------
 
class PropertyStream::Item : public List<Item>::Node
{
public:
    explicit Item(Source* source);
    Source&
    source() const;
    Source*
    operator->() const;
    Source&
    operator*() const;
 
private:
    Source* m_source;
};
 
//------------------------------------------------------------------------------
//
// Proxy
//
//------------------------------------------------------------------------------
 
class PropertyStream::Proxy
{
private:
    Map const* m_map;
    std::string m_key;
    std::ostringstream mutable m_ostream;
 
public:
    Proxy(Map const& map, std::string const& key);
    Proxy(Proxy const& other);
    ~Proxy();
 
    template <typename Value>
    Proxy&
    operator=(Value value);
 
    std::ostream&
    operator<<(std::ostream& manip(std::ostream&)) const;
 
    template <typename T>
    std::ostream&
    operator<<(T const& t) const
    {
        return m_ostream << t;
    }
};
 
//------------------------------------------------------------------------------
//
// Map
//
//------------------------------------------------------------------------------
 
class PropertyStream::Map
{
private:
    PropertyStream& m_stream;
 
public:
    explicit Map(PropertyStream& stream);
    explicit Map(Set& parent);
    Map(std::string const& key, Map& parent);
    Map(std::string const& key, PropertyStream& stream);
    ~Map();
 
    Map(Map const&) = delete;
    Map&
    operator=(Map const&) = delete;
 
    PropertyStream&
    stream();
    PropertyStream const&
    stream() const;
 
    template <typename Value>
    void
    add(std::string const& key, Value value) const
    {
        m_stream.add(key, value);
    }
 
    template <typename Key, typename Value>
    void
    add(Key key, Value value) const
    {
        std::stringstream ss;
        ss << key;
        add(ss.str(), value);
    }
 
    Proxy
    operator[](std::string const& key);
 
    Proxy
    operator[](char const* key)
    {
        return Proxy(*this, key);
    }
 
    template <typename Key>
    Proxy
    operator[](Key key) const
    {
        std::stringstream ss;
        ss << key;
        return Proxy(*this, ss.str());
    }
};
 
//--------------------------------------------------------------------------
 
template <typename Value>
PropertyStream::Proxy&
PropertyStream::Proxy::operator=(Value value)
{
    m_map->add(m_key, value);
    return *this;
}
 
//--------------------------------------------------------------------------
//
// Set
//
//------------------------------------------------------------------------------
 
class PropertyStream::Set
{
private:
    PropertyStream& m_stream;
 
public:
    Set(std::string const& key, Map& map);
    Set(std::string const& key, PropertyStream& stream);
    ~Set();
 
    Set(Set const&) = delete;
    Set&
    operator=(Set const&) = delete;
 
    PropertyStream&
    stream();
    PropertyStream const&
    stream() const;
 
    template <typename Value>
    void
    add(Value value) const
    {
        m_stream.add(value);
    }
};
 
//------------------------------------------------------------------------------
//
// Source
//
//------------------------------------------------------------------------------
 
class PropertyStream::Source
{
private:
    std::string const m_name;
    std::recursive_mutex lock_;
    Item item_;
    Source* parent_;
    List<Item> children_;
 
public:
    explicit Source(std::string const& name);
    virtual ~Source();
 
    Source(Source const&) = delete;
    Source&
    operator=(Source const&) = delete;
 
    std::string const&
    name() const;
 
    void
    add(Source& source);
 
    template <class Derived>
    Derived*
    add(Derived* child)
    {
        add(*static_cast<Source*>(child));
        return child;
    }
 
    void
    remove(Source& child);
 
    void
    removeAll();
 
    void
    write_one(PropertyStream& stream);
 
    void
    write(PropertyStream& stream);
 
    void
    write(PropertyStream& stream, std::string const& path);
 
    std::pair<Source*, bool>
    find(std::string path);
 
    Source*
    find_one_deep(std::string const& name);
    PropertyStream::Source*
    find_path(std::string path);
    PropertyStream::Source*
    find_one(std::string const& name);
 
    static bool
    peel_leading_slash(std::string* path);
    static bool
    peel_trailing_slashstar(std::string* path);
    static std::string
    peel_name(std::string* path);
 
    //--------------------------------------------------------------------------
 
    virtual void
    onWrite(Map&);
};
 
}  // namespace beast
 
#endif