xapian-core/backends/documentinternal.cc

   1 /** @file documentinternal.cc
   2  * @brief Abstract base class for a document
   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 #include <config.h>
  22
  23 #include "backends/documentinternal.h"
  24
  25 #include "api/documenttermlist.h"
  26 #include "api/documentvaluelist.h"
  27 #include "str.h"
  28 #include "unicode/description_append.h"
  29
  30 #include "xapian/valueiterator.h"
  31
  32 using namespace std;
  33
  34 namespace Xapian {
  35
  36 void
  37 Document::Internal::ensure_terms_fetched() const
  38 {
  39     if (terms)
  40         return;
  41
  42     terms.reset(new map<string, TermInfo>());
  43     termlist_size = 0;
  44     if (!database.get())
  45         return;
  46
  47     unique_ptr<TermList> t(database->open_term_list(did));
  48     while (t->next(), !t->at_end()) {
  49         ++termlist_size;
  50         auto&& r = terms->emplace(make_pair(t->get_termname(),
  51                                             TermInfo(t->get_wdf())));
  52         TermInfo& term = r.first->second;
  53         for (auto p = t->positionlist_begin(); p != PositionIterator(); ++p) {
  54             term.append_position(*p);
  55         }
  56     }
  57 }
  58
  59 void
  60 Document::Internal::ensure_values_fetched() const
  61 {
  62     if (values)
  63         return;
  64
  65     values.reset(new map<Xapian::valueno, string>());
  66     if (database.get()) {
  67         fetch_all_values(*values);
  68     }
  69 }
  70
  71 string
  72 Document::Internal::fetch_data() const
  73 {
  74     return string();
  75 }
  76
  77 void
  78 Document::Internal::fetch_all_values(map<Xapian::valueno,
  79                                      string>& values_) const
  80 {
  81     values_.clear();
  82 }
  83
  84 string
  85 Document::Internal::fetch_value(Xapian::valueno) const
  86 {
  87     return string();
  88 }
  89
  90 Document::Internal::~Internal()
  91 {
  92     if (database.get())
  93         database->invalidate_doc_object(this);
  94 }
  95
  96 TermList*
  97 Document::Internal::open_term_list() const
  98 {
  99     if (terms)
 100         return new DocumentTermList(this);
 101
 102     if (!database.get())
 103         return NULL;
 104
 105     return database->open_term_list(did);
 106 }
 107
 108 Xapian::ValueIterator
 109 Document::Internal::values_begin() const
 110 {
 111     if (!values && database.get()) {
 112         values.reset(new map<Xapian::valueno, string>());
 113         fetch_all_values(*values);
 114     }
 115
 116     if (!values || values->empty())
 117         return Xapian::ValueIterator();
 118
 119     return Xapian::ValueIterator(new DocumentValueList(this));
 120 }
 121
 122 string
 123 Document::Internal::get_description() const
 124 {
 125     string desc = "Document(docid=";
 126     desc += str(did);
 127
 128     if (data) {
 129         desc += ", data=";
 130         description_append(desc, *data);
 131     }
 132
 133     if (terms) {
 134         desc += ", terms[";
 135         desc += str(terms->size());
 136         desc += ']';
 137     }
 138
 139     if (values) {
 140         desc += ", values[";
 141         desc += str(values->size());
 142         desc += ']';
 143     }
 144
 145     if (database.get()) {
 146         desc += ", db=";
 147         desc += database->get_description();
 148     }
 149
 150     desc += ')';
 151
 152     return desc;
 153 }
 154
 155 }