Element.hh

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/*
 * Copyright 2015 Open Source Robotics Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
*/
#ifndef _SDF_ELEMENT_HH_
#define _SDF_ELEMENT_HH_

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

#include "sdf/Param.hh"
#include "sdf/system_util.hh"
#include "sdf/Types.hh"

#ifdef _WIN32
// Disable warning C4251 which is triggered by
// std::enable_shared_from_this
#pragma warning(push)
#pragma warning(disable: 4251)
#endif

namespace sdf
{
  class ElementPrivate;
  class SDFORMAT_VISIBLE Element;

  typedef std::shared_ptr<Element> ElementPtr;

  typedef std::weak_ptr<Element> ElementWeakPtr;

  typedef std::vector<ElementPtr> ElementPtr_V;


  class SDFORMAT_VISIBLE Element :
    public std::enable_shared_from_this<Element>
  {
    public: Element();

    public: virtual ~Element();

    public: ElementPtr Clone() const;

    public: void Copy(const ElementPtr _elem);

    public: ElementPtr GetParent() const;

    public: void SetParent(const ElementPtr _parent);

    public: void SetName(const std::string &_name);

    public: const std::string &GetName() const;

    public: void SetRequired(const std::string &_req);

    public: const std::string &GetRequired() const;

    public: void SetCopyChildren(bool _value);

    public: bool GetCopyChildren() const;

    public: void SetReferenceSDF(const std::string &_value);

    public: std::string ReferenceSDF() const;

    public: void PrintDescription(const std::string &_prefix);

    public: void PrintValues(std::string _prefix);

    public: void PrintWiki(std::string _prefix);

    public: void PrintDocLeftPane(std::string &_html,
                                  int _spacing, int &_index);

    public: void PrintDocRightPane(std::string &_html,
                                  int _spacing, int &_index);

    public: std::string ToString(const std::string &_prefix) const;

    public: void AddAttribute(const std::string &_key,
                              const std::string &_type,
                              const std::string &_defaultvalue,
                              bool _required,
                              const std::string &_description="");

    public: void AddValue(const std::string &_type,
                          const std::string &_defaultValue, bool _required,
                          const std::string &_description="");

    public: ParamPtr GetAttribute(const std::string &_key);

    public: size_t GetAttributeCount() const;

    public: ParamPtr GetAttribute(unsigned int _index) const;

    public: size_t GetElementDescriptionCount() const;

    public: ElementPtr GetElementDescription(unsigned int _index) const;

    public: ElementPtr GetElementDescription(const std::string &_key) const;

    public: bool HasElementDescription(const std::string &_name);

    public: bool HasAttribute(const std::string &_key);

    public: bool GetAttributeSet(const std::string &_key);

    public: ParamPtr GetValue();

    public: boost::any GetAny(const std::string &_key = "");

    public: template<typename T>
            T Get(const std::string &_key = "");

    public: template<typename T>
            std::pair<T, bool> Get(const std::string &_key,
                                   const T &_defaultValue);

    public: template<typename T>
            bool Set(const T &_value);

    public: bool HasElement(const std::string &_name) const;

    public: ElementPtr GetElement(const std::string &_name) const;

    public: ElementPtr GetFirstElement() const;

    public: ElementPtr GetNextElement(const std::string &_name = "") const;

    public: ElementPtr GetElement(const std::string &_name);

    public: ElementPtr AddElement(const std::string &_name);
    public: void InsertElement(ElementPtr _elem);

    public: void RemoveFromParent();

    public: void RemoveChild(ElementPtr _child);

    public: void ClearElements();

    public: void Update();
    public: void Reset();

    public: void SetInclude(const std::string &_filename);
    public: std::string GetInclude() const;

    public: std::string GetDescription() const;

    public: void SetDescription(const std::string &_desc);

    public: void AddElementDescription(ElementPtr _elem);

    public: ElementPtr GetElementImpl(const std::string &_name) const;

    private: void ToString(const std::string &_prefix,
                           std::ostringstream &_out) const;


    private: ParamPtr CreateParam(const std::string &_key,
                 const std::string &_type, const std::string &_defaultValue,
                 bool _required, const std::string &_description="");


    private: ElementPrivate *dataPtr;
  };

  class ElementPrivate
  {
    public: std::string name;

    public: std::string required;

    public: std::string description;

    public: bool copyChildren;

    public: ElementWeakPtr parent;

    // Attributes of this element
    public: Param_V attributes;

    // Value of this element
    public: ParamPtr value;

    // The existing child elements
    public: ElementPtr_V elements;

    // The possible child elements
    public: ElementPtr_V elementDescriptions;

    public: std::string includeFilename;

    public: std::string referenceSDF;
  };

  template<typename T>
  T Element::Get(const std::string &_key)
  {
    T result = T();

    if (_key.empty() && this->dataPtr->value)
      this->dataPtr->value->Get<T>(result);
    else if (!_key.empty())
    {
      ParamPtr param = this->GetAttribute(_key);
      if (param)
        param->Get(result);
      else if (this->HasElement(_key))
        result = this->GetElementImpl(_key)->Get<T>();
      else if (this->HasElementDescription(_key))
        result = this->GetElementDescription(_key)->Get<T>();
      else
        sdferr << "Unable to find value for key[" << _key << "]\n";
    }
    return result;
  }

  template<typename T>
  std::pair<T, bool> Element::Get(const std::string &_key,
                                  const T &_defaultValue)
  {
    std::pair<T, bool> result(_defaultValue, true);

    if (_key.empty() && this->dataPtr->value)
      this->dataPtr->value->Get<T>(result.first);
    else if (!_key.empty())
    {
      ParamPtr param = this->GetAttribute(_key);
      if (param)
        param->Get(result.first);
      else if (this->HasElement(_key))
        result.first = this->GetElementImpl(_key)->Get<T>();
      else if (this->HasElementDescription(_key))
        result.first = this->GetElementDescription(_key)->Get<T>();
      else
        result.second = false;
    }
    else
    {
      result.second = false;
    }

    return result;
  }

  template<typename T>
  bool Element::Set(const T &_value)
  {
    if (this->dataPtr->value)
    {
      this->dataPtr->value->Set(_value);
      return true;
    }
    return false;
  }
}

#ifdef _WIN32
#pragma warning(pop)
#endif

#endif