collation.h

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/* Copyright (c) 2014, 2025, 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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   as designated in a particular file or component or in included license
   documentation.  The authors of MySQL hereby grant you an additional
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   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, version 2.0, for more details.
 
   You should have received a copy of the GNU General Public License
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   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */
 
#ifndef DD__COLLATION_INCLUDED
#define DD__COLLATION_INCLUDED
 
#include "my_inttypes.h"
#include "sql/dd/types/entity_object.h"  // dd::Entity_object
 
namespace dd {
 
///////////////////////////////////////////////////////////////////////////
 
class Charset;
class Collation_impl;
class Primary_id_key;
class Global_name_key;
class Void_key;
 
namespace tables {
class Collations;
}
 
///////////////////////////////////////////////////////////////////////////
 
class Collation : virtual public Entity_object {
 public:
  typedef Collation_impl Impl;
  typedef Collation Cache_partition;
  typedef tables::Collations DD_table;
  typedef Primary_id_key Id_key;
  typedef Global_name_key Name_key;
  typedef Void_key Aux_key;
 
  // Persisted pad attribute, mapped from Pad_attribute enum defined
  // in include/m_ctype.h. The setter is not part of the public API,
  // and there is no getter, since this attribute is only exposed
  // through the I_S.
  enum enum_pad_attribute { PA_UNDEFINED, PA_PAD_SPACE, PA_NO_PAD };
 
  // We need a set of functions to update a preallocated key.
  virtual bool update_id_key(Id_key *key) const {
    return update_id_key(key, id());
  }
 
  static bool update_id_key(Id_key *key, Object_id id);
 
  virtual bool update_name_key(Name_key *key) const {
    return update_name_key(key, name());
  }
 
  static bool update_name_key(Name_key *key, const String_type &name);
 
  virtual bool update_aux_key(Aux_key *) const { return true; }
 
 public:
  /////////////////////////////////////////////////////////////////////////
  // Character set.
  /////////////////////////////////////////////////////////////////////////
 
  virtual Object_id charset_id() const = 0;
  virtual void set_charset_id(Object_id charset_id) = 0;
 
  /////////////////////////////////////////////////////////////////////////
  // compiled
  /////////////////////////////////////////////////////////////////////////
 
  virtual bool is_compiled() const = 0;
 
  /////////////////////////////////////////////////////////////////////////
  // sort_length
  /////////////////////////////////////////////////////////////////////////
 
  virtual uint sort_length() const = 0;
 
  /**
    Allocate a new object and invoke the copy constructor.
 
    @return pointer to dynamically allocated copy
  */
  virtual Collation *clone() const = 0;
 
  /**
    Allocate a new object which can serve as a placeholder for the original
    object in the Dictionary_client's dropped registry (i.e. it has the same
    keys as original).
  */
  virtual Collation *clone_dropped_object_placeholder() const = 0;
};
 
///////////////////////////////////////////////////////////////////////////
 
}  // namespace dd
 
#endif  // DD__COLLATION_INCLUDED