1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
|
/** @file glass_docdata.h
* @brief Subclass of GlassTable which holds document data.
*/
/* Copyright (C) 2007,2008,2009,2010,2014,2016 Olly Betts
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef XAPIAN_INCLUDED_GLASS_DOCDATA_H
#define XAPIAN_INCLUDED_GLASS_DOCDATA_H
#include <xapian/types.h>
#include "glass_lazytable.h"
#include "pack.h"
#include <string>
class GlassDocDataTable : public GlassLazyTable {
public:
static std::string make_key(Xapian::docid did) {
std::string key;
pack_uint_preserving_sort(key, did);
return key;
}
/** Create a new GlassDocDataTable object.
*
* This method does not create or open the table on disk - you
* must call the create() or open() methods respectively!
*
* @param dbdir The directory the glass database is stored in.
* @param readonly true if we're opening read-only, else false.
*/
GlassDocDataTable(const std::string & dbdir, bool readonly)
: GlassLazyTable("docdata", dbdir + "/docdata.", readonly) { }
GlassDocDataTable(int fd, off_t offset_, bool readonly)
: GlassLazyTable("docdata", fd, offset_, readonly) { }
/** Get the document data for document @a did.
*
* If the document doesn't exist, the empty string is returned.
*
* @param did The docid to set the document data for.
*/
std::string get_document_data(Xapian::docid did) const {
// We don't store the document data if it is empty.
std::string data;
(void)get_exact_entry(make_key(did), data);
return data;
}
/** Set the document data for document @a did.
*
* If the document might already exist, use replace_document_data()
* instead.
*
* @param did The docid to set the document data for.
* @param data The document data to set.
*/
void add_document_data(Xapian::docid did, const std::string & data) {
// We don't store the document data if it is empty.
if (!data.empty())
add(make_key(did), data);
}
/** Replace the document data for document @a did.
*
* Any existing data is replaced.
*
* @param did The docid to replace the document data for.
* @param data The document data to set.
*/
void replace_document_data(Xapian::docid did, const std::string & data) {
if (data.empty()) {
// We don't store the document data if it is empty.
delete_document_data(did);
return;
}
add(make_key(did), data);
}
/** Delete the document data for document @a did.
*
* @param did The docid to delete the document data for.
*
* @return true if document data was actually removed (false means either
* there's no such document, or the document has no data).
*/
bool delete_document_data(Xapian::docid did) { return del(make_key(did)); }
void readahead_for_document(Xapian::docid did) const {
readahead_key(make_key(did));
}
};
#endif // XAPIAN_INCLUDED_GLASS_DOCDATA_H
|
