confignode.h

/*
    Lightmetrica : A research-oriented renderer

    Copyright (c) 2014 Hisanari Otsu

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#pragma once
#ifndef LIB_LIGHTMETRICA_CONFIG_NODE_H
#define LIB_LIGHTMETRICA_CONFIG_NODE_H

#include "object.h"
#include "logger.h"
#include "math.types.h"
#include <vector>

LM_NAMESPACE_BEGIN

class Config;

class LM_PUBLIC_API ConfigNode : public Object
{
public:

    ConfigNode();
    ~ConfigNode();

public:

    ConfigNode(const ConfigNode& config);
    void operator=(const ConfigNode& config);
    ConfigNode(ConfigNode&& config);
    void operator=(ConfigNode&& config);

public:

    ConfigNode(void* node, const Config* config);

public:

    const Config* GetConfig() const;

    bool Empty() const;

    ConfigNode Child(const std::string& name) const;
    
    ConfigNode FirstChild() const;
    
    ConfigNode NextChild() const;

    ConfigNode NextChild(const std::string& name) const;

    std::string Name() const;

    std::string Value() const;

    template <typename T>
    T Value() const;

    std::string AttributeValue(const std::string& name) const;

    template <typename T>
    bool ChildValueOrDefault(const std::string& name, const T& defaultValue, T& value) const
    {
        const auto child = Child(name);
        if (child.Empty())
        {
            LM_LOG_WARN("Missing '" + name + "' element. Using default value.");
            value = defaultValue;
            return false;
        }

        value = child.Value<T>();
        return true;
    }

    template <typename T>
    bool ChildValue(const std::string& name, T& value) const
    {
        const auto child = Child(name);
        if (child.Empty())
        {
            LM_LOG_ERROR("Missing '" + name + "' element");
            return false;
        }

        value = child.Value<T>();
        return true;
    }

private:

    class Impl;
    Impl* p;

};

#ifndef LM_EXPORTS
extern template LM_PUBLIC_API std::string ConfigNode::Value<std::string>() const;
extern template LM_PUBLIC_API int ConfigNode::Value<int>() const;
extern template LM_PUBLIC_API long long ConfigNode::Value<long long>() const;
extern template LM_PUBLIC_API bool ConfigNode::Value<bool>() const;
extern template LM_PUBLIC_API Math::Float ConfigNode::Value<Math::Float>() const;
extern template LM_PUBLIC_API Math::Vec3 ConfigNode::Value<Math::Vec3>() const;
extern template LM_PUBLIC_API Math::Mat4 ConfigNode::Value<Math::Mat4>() const;
extern template LM_PUBLIC_API std::vector<Math::Float> ConfigNode::Value<std::vector<Math::Float>>() const;
extern template LM_PUBLIC_API std::vector<unsigned int> ConfigNode::Value<std::vector<unsigned int>>() const;
#endif

LM_NAMESPACE_END

#endif // LIB_LIGHTMETRICA_CONFIG_NODE_H