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/* xapian-dump: Create a textual dump of a Xapian database.
*
* Copyright © 2009 Carl Worth
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* 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 for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see http://www.gnu.org/licenses/ .
*
* Author: Carl Worth <cworth@cworth.org>
*/
/* Currently the dumped data includes:
*
* All document IDs
*
* And for each document ID:
*
* Document data
* All document terms
* All document values
*/
#include <cstdlib>
#include <iostream>
#include <algorithm>
#include <xapian.h>
using namespace std;
vector<int> UNSERIALIZE;
unsigned int MAX_TERMS = 0;
static void
print_escaped_string (const char *s)
{
printf ("\"");
while (*s) {
if (*s == '"')
printf ("\\");
printf ("%c", *s);
s++;
}
printf ("\"");
}
static void
print_document_terms (Xapian::Document doc)
{
Xapian::TermIterator it;
unsigned int i;
printf (" {\n");
for (it = doc.termlist_begin (), i = 0;
it != doc.termlist_end ();
it++, i++)
{
printf (" ");
print_escaped_string ((*it).c_str());
printf (",\n");
}
for ( ; i < MAX_TERMS; i++)
printf (" \"\",\n");
printf (" },\n");
}
static int
vector_int_contains (vector<int> v, int i)
{
vector<int>::iterator result;
result = find (v.begin(), v.end(), i);
return result != v.end();
}
static void
print_document_values (Xapian::Document doc)
{
Xapian::ValueIterator i;
int value_no, value_int;
double value_float;
for (i = doc.values_begin (); i != doc.values_end (); i++) {
value_no = i.get_valueno();
printf (" ");
if (vector_int_contains (UNSERIALIZE, value_no)) {
value_float = Xapian::sortable_unserialise (*i);
value_int = value_float;
if (value_int == value_float)
printf ("%d", value_int);
else
printf ("\"%f\"", value_float);
} else {
print_escaped_string ((*i).c_str ());
}
printf (",\n");
}
}
static void
print_document (Xapian::Database db, Xapian::docid id)
{
Xapian::Document doc;
printf ("{\n");
doc = db.get_document (id);
printf (" \"%s\",\n", doc.get_data ().c_str());
print_document_terms (doc);
print_document_values (doc);
printf ("},\n");
}
int
main (int argc, char *argv[])
{
const char *database_path;
int i;
if (argc < 2) {
fprintf (stderr, "Usage: %s <path-to-xapian-database> [value_nos...]\n",
argv[0]);
fprintf (stderr, "Dumps data from the given database.\n");
fprintf (stderr, "The values corresponding to any value numbers given on the command line\n");
fprintf (stderr, "will be unserialized to an before being printed.\n");
exit (1);
}
database_path = argv[1];
UNSERIALIZE = vector<int> ();
for (i = 2; i < argc; i++)
UNSERIALIZE.push_back (atoi (argv[i]));
try {
Xapian::Database db;
Xapian::PostingIterator i;
Xapian::docid doc_id;
db = Xapian::Database (database_path);
for (i = db.postlist_begin (""); i != db.postlist_end (""); i++) {
Xapian::Document doc;
doc_id = *i;
doc = db.get_document (doc_id);
if (doc.termlist_count () > MAX_TERMS)
MAX_TERMS = doc.termlist_count ();
}
printf ("#define MAX_TERMS %d\n\n", MAX_TERMS);
printf ("typedef struct {\n"
" char data[255];\n"
" char terms[MAX_TERMS][255];\n"
" char message_id[255];\n"
" char thread_id[4096];\n"
" time_t time;\n"
"} document_dump_t;\n\n");
printf ("document_dump_t dump[] = {\n");
for (i = db.postlist_begin (""); i != db.postlist_end (""); i++) {
doc_id = *i;
print_document (db, doc_id);
}
printf ("};\n");
} catch (const Xapian::Error &error) {
cerr << "A Xapian exception occurred: " << error.get_msg () << endl;
exit (1);
}
return 0;
}
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