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
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
|
<?php // -*-php-*-
rcs_id('$Id: LinkSearchIter.php,v 1.2 2007/01/04 16:41:25 rurban Exp $');
/*
Copyright 2007 Reini Urban
This file is part of PhpWiki.
PhpWiki is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
PhpWiki is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with PhpWiki; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/**
* Ad-hoc support for an RDF-Triple search in our link database.
*
* This iterator will work with any WikiDB_backend
* which has a working get_links() method with want_relation support.
* Currently we iterate over all pages, check for all matching links.
* As optimization a backend could iterate over the linktable instead
* and check the matching page there. There are most likely less links
* than pages and links are smaller than pages.
*
* This is mostly here for testing, very slow.
*
* @author Reini Urban
* @see WikiDB_backend::link_search
*/
class WikiDB_backend_dumb_LinkSearchIter
extends WikiDB_backend_iterator
{
function WikiDB_backend_dumb_LinkSearchIter(&$backend, &$pageiter, $search, $linktype,
$relation=false, $options=array())
{
$this->_backend = &$backend;
$this->_pages = $pageiter;
$this->search = $search; // search the linkvalue. it should be the value or pagename
$this->relation = $relation; // limit the search to this linkname
$this->linktype = $linktype;
$this->_reverse = false;
$this->_want_relations = true;
$this->sortby = isset($options['sortby']) ? $options['sortby'] : '';
$this->limit = isset($options['limit']) ? $options['limit'] : '';
$this->exclude = isset($options['exclude']) ? $options['exclude'] : '';
$this->_field = 'pagename'; // the name of the linkvalue field to apply the search
$this->_dbi =& $GLOBALS['request']->_dbi;
if ($linktype == 'relation') {
$this->_want_relations = true;
$this->_field = 'linkrelation';
}
if ($linktype == 'attribute') {
$this->_want_relations = true;
$this->_field = 'attribute';
}
if ($linktype == 'linkfrom') {
$this->_reverse = true;
}
$this->_page = false;
}
// iterate a nested page-links loop. there will be multiple results per page.
// we must keep the page iter internally.
function next() {
while (1) {
if (!isset($this->_links) or count($this->_links) == 0) {
$page = $this->_next_page(); // initialize all links of this page
if (!$page) return false;
} else {
$page = $this->_page;
}
// iterate the links. the links are pushed into the handy triple by _get_links
while ($link = array_shift($this->_links)) {
// unmatching relations are already filtered out
if ($this->search->match($link['linkvalue'])) { //pagename or attr-value
if ($link['linkname'])
return array('pagename' => $page,
'linkname' => $link['linkname'],
'linkvalue'=> $link['linkvalue']);
else
return array('pagename' => $page,
'linkvalue'=> $link['linkvalue']);
}
}
// no links on this page anymore.
}
}
// initialize the links also
function _next_page() {
unset($this->_links);
if (!($next = $this->_pages->next()))
return false;
$this->_page = $next['pagename'];
while(!($this->_links = $this->_get_links($this->_page))) {
if (!($next = $this->_pages->next()))
return false;
$this->_page = $next['pagename'];
}
return $this->_page;
}
// get the links of each page in advance
function _get_links($pagename) {
$links = array();
if ($this->linktype == 'attribute') {
$page = $this->_dbi->getPage($pagename);
$attribs = $page->get('attributes');
if ($attribs) {
foreach ($attribs as $attribute => $value) {
if ($this->relation and !$this->relation->match($attribute)) continue;
// The logical operator and unit unification (not yet) is encoded into
// a seperate search object.
if (!$this->search->match($value)) continue;
$links[] = array('pagename' => $pagename,
'linkname' => $attribute,
'linkvalue' => $value);
}
}
unset($attribs);
} else {
$link_iter = $this->_backend->get_links($pagename, $this->_reverse, true,
$this->sortby, $this->limit,
$this->exclude, $this->_want_relations);
// we already stepped through all links. make use of that.
if ($this->_want_relations
and isset($link_iter->_options['found_relations'])
and $link_iter->_options['found_relations'] == 0)
{
$link_iter->free();
return $links;
}
while ($link = $link_iter->next()) {
if (empty($link[$this->_field])) continue;
if ($this->_want_relations and $this->relation
and !$this->relation->match($link['linkrelation'])) continue;
// check hash values, with/out want_relations
$links[] = array('pagename' => $pagename,
'linkname' => $this->_want_relations ? $link['linkrelation'] : '',
'linkvalue' => $link['pagename']);
}
$link_iter->free();
}
return $links;
}
function free() {
$this->_page = false;
unset($this->_links);
$this->_pages->free();
}
}
// For emacs users
// Local Variables:
// mode: php
// tab-width: 8
// c-basic-offset: 4
// c-hanging-comment-ender-p: nil
// indent-tabs-mode: nil
// End:
?>
|
