foreign_key_element.h

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/* Copyright (c) 2014, 2023, Oracle and/or its affiliates.
 
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License, version 2.0,
   as published by the Free Software Foundation.
 
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License, version 2.0, for more details.
 
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   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */
 
#ifndef DD__FOREIGN_KEY_ELEMENT_INCLUDED
#define DD__FOREIGN_KEY_ELEMENT_INCLUDED
 
#include "my_inttypes.h"
#include "sql/dd/sdi_fwd.h"            // dd::Sdi_wcontext
#include "sql/dd/types/weak_object.h"  // dd::Weak_object
 
namespace dd {
 
///////////////////////////////////////////////////////////////////////////
 
class Column;
class Foreign_key;
class Foreign_key_element_impl;
 
namespace tables {
class Foreign_key_column_usage;
}
 
///////////////////////////////////////////////////////////////////////////
 
class Foreign_key_element : virtual public Weak_object {
 public:
  typedef Foreign_key_element_impl Impl;
  typedef tables::Foreign_key_column_usage DD_table;
 
 public:
  ~Foreign_key_element() override = default;
 
  /////////////////////////////////////////////////////////////////////////
  // Foreign key.
  /////////////////////////////////////////////////////////////////////////
 
  virtual const Foreign_key &foreign_key() const = 0;
 
  virtual Foreign_key &foreign_key() = 0;
 
  /////////////////////////////////////////////////////////////////////////
  // column.
  /////////////////////////////////////////////////////////////////////////
 
  virtual const Column &column() const = 0;
 
  virtual void set_column(const Column *column) = 0;
 
  /////////////////////////////////////////////////////////////////////////
  // ordinal_position.
  /////////////////////////////////////////////////////////////////////////
 
  virtual uint ordinal_position() const = 0;
 
  virtual void set_ordinal_position(int ordinal_position) = 0;
 
  /////////////////////////////////////////////////////////////////////////
  // referenced column name.
  /////////////////////////////////////////////////////////////////////////
 
  virtual const String_type &referenced_column_name() const = 0;
  virtual void referenced_column_name(const String_type &name) = 0;
 
  /**
    Converts *this into json.
 
    Converts all member variables that are to be included in the sdi
    into json by transforming them appropriately and passing them to
    the rapidjson writer provided.
 
    @param wctx  opaque context for data needed by serialization
    @param w rapidjson writer which will perform conversion to json
 
  */
 
  virtual void serialize(Sdi_wcontext *wctx, Sdi_writer *w) const = 0;
 
  /**
    Re-establishes the state of *this by reading sdi information from
    the rapidjson DOM subobject provided.
 
    Cross-references encountered within this object are tracked in
    sdictx, so that they can be updated when the entire object graph
    has been established.
 
    @param rctx stores book-keeping information for the
    deserialization process
    @param val subobject of rapidjson DOM containing json
    representation of this object
    @retval     false       success
    @retval     true        failure
  */
 
  virtual bool deserialize(Sdi_rcontext *rctx, const RJ_Value &val) = 0;
};
 
///////////////////////////////////////////////////////////////////////////
 
}  // namespace dd
 
#endif  // DD__FOREIGN_KEY_ELEMENT_INCLUDED