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generated by cgit v1.2.1 (git 2.18.0) at 2024-12-24 16:10:51 +0000
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/* SPDX-License-Identifier: BSD-2-Clause */
/*
 * Copyright (C) 2019-2021, Raspberry Pi (Trading) Limited
 *
 * metadata.hpp - general metadata class
 */
#pragma once

// A simple class for carrying arbitrary metadata, for example about an image.

#include <any>
#include <map>
#include <mutex>
#include <string>

namespace RPiController {

class Metadata
{
public:
	Metadata() = default;

	Metadata(Metadata const &other)
	{
		std::scoped_lock other_lock(other.mutex_);
		data_ = other.data_;
	}

	Metadata(Metadata &&other)
	{
		std::scoped_lock other_lock(other.mutex_);
		data_ = std::move(other.data_);
		other.data_.clear();
	}

	template<typename T>
	void Set(std::string const &tag, T const &value)
	{
		std::scoped_lock lock(mutex_);
		data_[tag] = value;
	}

	template<typename T>
	int Get(std::string const &tag, T &value) const
	{
		std::scoped_lock lock(mutex_);
		auto it = data_.find(tag);
		if (it == data_.end())
			return -1;
		value = std::any_cast<T>(it->second);
		return 0;
	}

	void Clear()
	{
		std::scoped_lock lock(mutex_);
		data_.clear();
	}

	Metadata &operator=(Metadata const &other)
	{
		std::scoped_lock lock(mutex_, other.mutex_);
		data_ = other.data_;
		return *this;
	}

	Metadata &operator=(Metadata &&other)
	{
		std::scoped_lock lock(mutex_, other.mutex_);
		data_ = std::move(other.data_);
		other.data_.clear();
		return *this;
	}

	void Merge(Metadata &other)
	{
		std::scoped_lock lock(mutex_, other.mutex_);
		data_.merge(other.data_);
	}

	template<typename T>