
/*

  KLayout Layout Viewer
  Copyright (C) 2006-2017 Matthias Koefferlein

  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 2 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, write to the Free Software
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

*/


#ifndef HDR_dbPropertiesRepository
#define HDR_dbPropertiesRepository

#include "dbCommon.h"

#include "tlVariant.h"
#include "dbTypes.h"

#include <vector>
#include <string>
#include <map>

namespace db
{

class LayoutStateModel;

/**
 *  @brief The properties repository
 *
 *  This repository associates a set of property name/value pairs with 
 *  an unique Id which can be stored with a object_with_properties element.
 *  For performance reasons property names (which are strings) are not
 *  stored as such but as integers.
 */

class DB_PUBLIC PropertiesRepository
{
public:
  typedef std::multimap <property_names_id_type, tl::Variant> properties_set;
  typedef std::map <properties_id_type, properties_set> properties_map;
  typedef std::map <properties_id_type, properties_set>::const_iterator iterator;
  typedef std::map <properties_id_type, properties_set>::iterator non_const_iterator;
  typedef std::pair <property_names_id_type, tl::Variant> name_value_pair;
  typedef std::vector <properties_id_type> properties_id_vector;

  /**
   *  @brief Default constructor
   */
  PropertiesRepository (db::LayoutStateModel *state_model = 0);

  /**
   *  @brief Assignment
   */
  PropertiesRepository &operator= (const PropertiesRepository &d);

  /**
   *  @brief Associate a name with a name Id
   * 
   *  A name of a property can be either a integer or a string as specified
   *  with the tl::Variant variant. In principle it could even be a list or void.
   *  This method will assign a new Id to the given name if required and
   *  return the Id associated with it.
   */
  property_names_id_type prop_name_id (const tl::Variant &name);
  
  /**
   *  @brief Change the name associated with a given name Id to another name
   * 
   *  All properties with the given name Id will get the new name. This method is
   *  particular useful for the OASIS reader, which may associate a name with an Id 
   *  at a late stage. The new name must not be associated with an Id already.
   *  The old name will stay associated with the Id.
   */
  void change_name (property_names_id_type id, const tl::Variant &new_name);
  
  /**
   *  @brief Change the properties for a given Id
   * 
   *  This method will change the properties for a given Id. The properties
   *  set for Id 0 cannot be changed.
   *
   *  This method is intended for special applications, i.e. the OASIS reader
   *  in forware references mode.
   */
  void change_properties (properties_id_type id, const properties_set &new_props);

  /**
   *  @brief Get the id for a name 
   * 
   *  This method checks wheter the given name is present as a name and returns the 
   *  id in the second member of the pair. The first member is true, if the name is
   *  present.
   */
  std::pair<bool, property_names_id_type> get_id_of_name (const tl::Variant &name) const;
  
  /**
   *  @brief Associate a name with a name Id
   * 
   *  This method will return the name associated with the given Id.
   *  It will assert if the Id is not a valid one.
   */
  const tl::Variant &prop_name (property_names_id_type id) const;
  
  /**
   *  @brief Associate a properties set with a properties Id
   * 
   *  This method will assign a new Id to the given set if required and
   *  return the Id associated with it.
   *  An empty property set is associated with property Id 0.
   */
  properties_id_type properties_id (const properties_set &props);
  
  /**
   *  @brief Associate a properties set with a properties Id
   * 
   *  This method will return the properties set associated with the given Id.
   *  Id 0 always delivers an empty property set.
   */
  const properties_set &properties (properties_id_type id) const;

  /**
   *  @brief Determine if the given Id is a valid one
   */
  bool is_valid_properties_id (properties_id_type id) const;

  /**
   *  @brief Iterate over Id/Properties sets (non-const)
   */
  non_const_iterator begin_non_const () 
  {
    return m_properties_by_id.begin ();
  }

  /**
   *  @brief Iterate over Id/Properties sets: end iterator (non-const)
   */
  non_const_iterator end_non_const () 
  {
    return m_properties_by_id.end ();
  }

  /**
   *  @brief Iterate over Id/Properties sets
   */
  iterator begin () const
  {
    return m_properties_by_id.begin ();
  }

  /**
   *  @brief Iterate over Id/Properties sets: end iterator
   */
  iterator end () const
  {
    return m_properties_by_id.end ();
  }

  /**
   *  @brief Obtain the first properties id in the repository
   */
  properties_id_type begin_id () 
  {
    return 0;
  }
  
  /**
   *  @brief Obtain the last properties id in the repository plus 1
   */
  properties_id_type end_id () 
  {
    return m_properties_by_id.size ();
  }
  
  /**
   *  @brief Lookup a table of properties id's by a name value pair
   *
   *  For a given name/value pair, this method returns a vector of ids
   *  of property sets that contain the given name/value pair. This method
   *  is intended for use with the properties_id resolution algorithm.
   */
  const properties_id_vector &properties_ids_by_name_value (const name_value_pair &nv) const;

  /**
   *  @brief Translate a properties id from one repository to this one
   *
   *  Take the given properties set from one repository and map it to this one.
   *  Inserts the properties set into this repository if necessary.
   *
   *  @param rep The source repository
   *  @param id The source properties id
   *  @return id The id in *this
   */
  properties_id_type translate (const PropertiesRepository &rep, properties_id_type id);

private:
  std::map <property_names_id_type, tl::Variant> m_propnames_by_id;
  std::map <tl::Variant, property_names_id_type> m_propname_ids_by_name;

  std::map <properties_id_type, properties_set> m_properties_by_id;
  std::map <properties_set, properties_id_type> m_properties_ids_by_set;
  std::map <name_value_pair, properties_id_vector> m_properties_component_table;

  db::LayoutStateModel *mp_state_model;

  PropertiesRepository (const PropertiesRepository &d);
};

} // namespace db

#endif

