column_type_element.h

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/* Copyright (c) 2014, 2024, Oracle and/or its affiliates.
 
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   it under the terms of the GNU General Public License, version 2.0,
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#ifndef DD__COLUMN_TYPE_ELEMENT_INCLUDED
#define DD__COLUMN_TYPE_ELEMENT_INCLUDED
 
#include "my_inttypes.h"
#include "sql/dd/sdi_fwd.h"            // dd::Sdi_rcontext
#include "sql/dd/types/weak_object.h"  // dd::Weak_object
 
namespace dd {
 
///////////////////////////////////////////////////////////////////////////
 
class Column;
class Column_type_element_impl;
 
namespace tables {
class Column_type_elements;
}
 
///////////////////////////////////////////////////////////////////////////
 
class Column_type_element : virtual public Weak_object {
 public:
  typedef Column_type_element_impl Impl;
  typedef tables::Column_type_elements DD_table;
 
 public:
  ~Column_type_element() override = default;
 
  /////////////////////////////////////////////////////////////////////////
  // Name
  /////////////////////////////////////////////////////////////////////////
 
  virtual const String_type &name() const = 0;
  virtual void set_name(const String_type &name) = 0;
 
  /////////////////////////////////////////////////////////////////////////
  // Column
  /////////////////////////////////////////////////////////////////////////
 
  virtual const Column &column() const = 0;
 
  /////////////////////////////////////////////////////////////////////////
  // Index
  /////////////////////////////////////////////////////////////////////////
 
  virtual uint index() const = 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__COLUMN_TYPE_ELEMENT_INCLUDED