DataType.h

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/******************************************************************************
 * Copyright (C) 2014 by Ralf Kaestner                                        *
 * ralf.kaestner@gmail.com                                                    *
 *                                                                            *
 * This program is free software; you can redistribute it and/or modify       *
 * it under the terms of the Lesser 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               *
 * Lesser GNU General Public License for more details.                        *
 *                                                                            *
 * You should have received a copy of the Lesser GNU General Public License   *
 * along with this program. If not, see <http://www.gnu.org/licenses/>.       *
 ******************************************************************************/

#ifndef VARIANT_TOPIC_TOOLS_DATA_TYPE_H
#define VARIANT_TOPIC_TOOLS_DATA_TYPE_H

#include <typeinfo>
#include <vector>

#include <ros/ros.h>

#include <variant_topic_tools/Forwards.h>

namespace variant_topic_tools {
  class DataType {
  friend class DataTypeHash;
  friend class DataTypeRegistry;
  friend class Serializer;
  public:
    DataType();
    
    DataType(const char* identifier);
    
    DataType(const std::string& identifier);
    
    DataType(const std::type_info& typeInfo);
    
    DataType(const DataType& src);
    
    virtual ~DataType();

    const std::string& getIdentifier() const;
    
    const std::type_info& getTypeInfo() const;
    
    size_t getSize() const;
    
    bool isArray() const;
    
    bool isBuiltin() const;
    
    bool isMessage() const;
    
    bool isFixedSize() const;

    bool isSimple() const;

    bool isValid() const;
    
    bool hasTypeInfo() const;
    
    void clear();
    
    void write(std::ostream& stream) const;
    
    Serializer createSerializer() const;
    
    Variant createVariant() const;
    
    virtual DataType& operator=(const DataType& src);
    
    inline operator void*() const {
      return (impl) ? (void*)1 : (void*)0;
    };
    
    inline bool operator==(const DataType& dataType) const {
      return (impl && dataType.impl) ? (*impl == *dataType.impl) :
        (impl == dataType.impl);
    };
    
    inline bool operator!=(const DataType& dataType) const {
      return (impl && dataType.impl) ? (*impl != *dataType.impl) :
        (impl != dataType.impl);
    };
    
  protected:
    class Impl {
    public:
      Impl();
      
      virtual ~Impl();

      virtual const std::string& getIdentifier() const = 0;
    
      virtual const std::type_info& getTypeInfo() const;
    
      virtual size_t getSize() const = 0;
      
      virtual bool isFixedSize() const = 0;
      
      virtual bool isSimple() const = 0;
      
      virtual Serializer createSerializer(const DataType& type) const = 0;
      
      virtual Variant createVariant(const DataType& type) const = 0;
    };
    
    typedef boost::shared_ptr<boost::shared_ptr<Impl> > ImplPtr;
    
    typedef boost::shared_ptr<boost::weak_ptr<Impl> > ImplWPtr;
    
    ImplPtr impl;
  };
    
  std::ostream& operator<<(std::ostream& stream, const DataType& dataType);
};

#endif