xapian-core/backends/empty_database.h

   1 /** @file emptydatabase.h
   2  * @brief Empty database internals
   3  */
   4 /* Copyright 2017 Olly Betts
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License as
   8  * published by the Free Software Foundation; either version 2 of the
   9  * License, or (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  19  */
  20
  21 #ifndef XAPIAN_INCLUDED_EMPTY_DATABASE_H
  22 #define XAPIAN_INCLUDED_EMPTY_DATABASE_H
  23
  24 #include "backends/databaseinternal.h"
  25
  26 /// Empty database internals.
  27 class EmptyDatabase : public Xapian::Database::Internal {
  28   public:
  29     EmptyDatabase() : Xapian::Database::Internal(TRANSACTION_NONE) {}
  30
  31     size_type size() const;
  32
  33     void close();
  34
  35     PostList* open_post_list(const std::string& term) const;
  36
  37     LeafPostList* open_leaf_post_list(const std::string& term,
  38                                       bool need_pos) const;
  39
  40     TermList* open_term_list(Xapian::docid did) const;
  41
  42     TermList* open_term_list_direct(Xapian::docid did) const;
  43
  44     TermList* open_allterms(const std::string& prefix) const;
  45
  46     bool has_positions() const;
  47
  48     PositionList* open_position_list(Xapian::docid did,
  49                                      const std::string& term) const;
  50     Xapian::doccount get_doccount() const;
  51
  52     Xapian::docid get_lastdocid() const;
  53
  54     Xapian::totallength get_total_length() const;
  55
  56     void get_freqs(const std::string& term,
  57                    Xapian::doccount* tf_ptr,
  58                    Xapian::termcount* cf_ptr) const;
  59
  60     Xapian::doccount get_value_freq(Xapian::valueno slot) const;
  61
  62     std::string get_value_lower_bound(Xapian::valueno slot) const;
  63
  64     std::string get_value_upper_bound(Xapian::valueno slot) const;
  65
  66     Xapian::termcount get_doclength_lower_bound() const;
  67
  68     Xapian::termcount get_doclength_upper_bound() const;
  69
  70     Xapian::termcount get_wdf_upper_bound(const std::string& term) const;
  71
  72     ValueList* open_value_list(Xapian::valueno slot) const;
  73
  74     Xapian::termcount get_doclength(Xapian::docid did) const;
  75
  76     Xapian::termcount get_unique_terms(Xapian::docid did) const;
  77
  78     Xapian::Document::Internal* open_document(Xapian::docid did,
  79                                               bool lazy) const;
  80
  81     bool term_exists(const std::string& term) const;
  82
  83     TermList* open_spelling_termlist(const std::string& word) const;
  84
  85     TermList* open_spelling_wordlist() const;
  86
  87     Xapian::doccount get_spelling_frequency(const std::string& word) const;
  88
  89     TermList* open_synonym_termlist(const std::string& term) const;
  90
  91     TermList* open_synonym_keylist(const std::string& prefix) const;
  92
  93     std::string get_metadata(const std::string& key) const;
  94
  95     TermList* open_metadata_keylist(const std::string& prefix) const;
  96
  97     void write_changesets_to_fd(int fd,
  98                                 const std::string& start_revision,
  99                                 bool need_whole_db,
 100                                 Xapian::ReplicationInfo* info);
 101
 102     void invalidate_doc_object(Xapian::Document::Internal* obj) const;
 103
 104     Xapian::rev get_revision() const;
 105
 106     int get_backend_info(std::string* path) const;
 107
 108     void commit();
 109
 110     void cancel();
 111
 112     void begin_transaction(bool flushed);
 113
 114     void end_transaction_(bool do_commit);
 115
 116     Xapian::docid add_document(const Xapian::Document& doc);
 117
 118     void delete_document(Xapian::docid did);
 119
 120     void delete_document(const std::string& term);
 121
 122     void replace_document(Xapian::docid did, const Xapian::Document& doc);
 123
 124     Xapian::docid replace_document(const std::string& term,
 125                                    const Xapian::Document& doc);
 126
 127     void add_spelling(const std::string& word, Xapian::termcount freqinc) const;
 128
 129     Xapian::termcount remove_spelling(const std::string& word,
 130                                       Xapian::termcount freqdec) const;
 131
 132     void add_synonym(const std::string& term, const std::string& synonym) const;
 133
 134     void remove_synonym(const std::string& term,
 135                         const std::string& synonym) const;
 136
 137     void clear_synonyms(const std::string& term) const;
 138
 139     void set_metadata(const std::string& key, const std::string& value);
 140
 141     std::string get_description() const;
 142 };
 143
 144 #endif // XAPIAN_INCLUDED_EMPTY_DATABASE_H