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Commit | Line | Data |
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ca74886f V |
1 | <?php |
2 | /** | |
3 | * Data storage for links. | |
4 | * | |
5 | * This object behaves like an associative array. | |
6 | * | |
7 | * Example: | |
8 | * $myLinks = new LinkDB(); | |
29d10882 | 9 | * echo $myLinks[350]['title']; |
ca74886f V |
10 | * foreach ($myLinks as $link) |
11 | * echo $link['title'].' at url '.$link['url'].'; description:'.$link['description']; | |
12 | * | |
13 | * Available keys: | |
29d10882 | 14 | * - id: primary key, incremental integer identifier (persistent) |
ca74886f | 15 | * - description: description of the entry |
29d10882 A |
16 | * - created: creation date of this entry, DateTime object. |
17 | * - updated: last modification date of this entry, DateTime object. | |
ca74886f V |
18 | * - private: Is this link private? 0=no, other value=yes |
19 | * - tags: tags attached to this entry (separated by spaces) | |
20 | * - title Title of the link | |
49e62f22 A |
21 | * - url URL of the link. Used for displayable links (no redirector, relative, etc.). |
22 | * Can be absolute or relative. | |
ca74886f | 23 | * Relative URLs are permalinks (e.g.'?m-ukcw') |
49e62f22 | 24 | * - real_url Absolute processed URL. |
d592daea | 25 | * - shorturl Permalink smallhash |
ca74886f V |
26 | * |
27 | * Implements 3 interfaces: | |
28 | * - ArrayAccess: behaves like an associative array; | |
29 | * - Countable: there is a count() method; | |
30 | * - Iterator: usable in foreach () loops. | |
29d10882 A |
31 | * |
32 | * ID mechanism: | |
33 | * ArrayAccess is implemented in a way that will allow to access a link | |
34 | * with the unique identifier ID directly with $link[ID]. | |
35 | * Note that it's not the real key of the link array attribute. | |
36 | * This mechanism is in place to have persistent link IDs, | |
37 | * even though the internal array is reordered by date. | |
38 | * Example: | |
39 | * - DB: link #1 (2010-01-01) link #2 (2016-01-01) | |
40 | * - Order: #2 #1 | |
41 | * - Import links containing: link #3 (2013-01-01) | |
42 | * - New DB: link #1 (2010-01-01) link #2 (2016-01-01) link #3 (2013-01-01) | |
43 | * - Real order: #2 #3 #1 | |
ca74886f V |
44 | */ |
45 | class LinkDB implements Iterator, Countable, ArrayAccess | |
46 | { | |
9c8752a2 | 47 | // Links are stored as a PHP serialized string |
628b97cb | 48 | private $datastore; |
9c8752a2 | 49 | |
205a4277 V |
50 | // Link date storage format |
51 | const LINK_DATE_FORMAT = 'Ymd_His'; | |
52 | ||
ca74886f V |
53 | // List of links (associative array) |
54 | // - key: link date (e.g. "20110823_124546"), | |
55 | // - value: associative array (keys: title, description...) | |
628b97cb | 56 | private $links; |
ca74886f | 57 | |
29d10882 A |
58 | // List of all recorded URLs (key=url, value=link offset) |
59 | // for fast reserve search (url-->link offset) | |
628b97cb | 60 | private $urls; |
ca74886f | 61 | |
29d10882 A |
62 | /** |
63 | * @var array List of all links IDS mapped with their array offset. | |
64 | * Map: id->offset. | |
65 | */ | |
66 | protected $ids; | |
67 | ||
68 | // List of offset keys (for the Iterator interface implementation) | |
628b97cb | 69 | private $keys; |
ca74886f | 70 | |
628b97cb V |
71 | // Position in the $this->keys array (for the Iterator interface) |
72 | private $position; | |
ca74886f V |
73 | |
74 | // Is the user logged in? (used to filter private links) | |
628b97cb | 75 | private $loggedIn; |
ca74886f | 76 | |
9f15ca9e | 77 | // Hide public links |
628b97cb | 78 | private $hidePublicLinks; |
9f15ca9e | 79 | |
90e5bd65 | 80 | // link redirector set in user settings. |
628b97cb | 81 | private $redirector; |
90e5bd65 | 82 | |
043eae70 A |
83 | /** |
84 | * Set this to `true` to urlencode link behind redirector link, `false` to leave it untouched. | |
85 | * | |
86 | * Example: | |
87 | * anonym.to needs clean URL while dereferer.org needs urlencoded URL. | |
88 | * | |
89 | * @var boolean $redirectorEncode parameter: true or false | |
90 | */ | |
91 | private $redirectorEncode; | |
92 | ||
ca74886f V |
93 | /** |
94 | * Creates a new LinkDB | |
95 | * | |
96 | * Checks if the datastore exists; else, attempts to create a dummy one. | |
97 | * | |
043eae70 A |
98 | * @param string $datastore datastore file path. |
99 | * @param boolean $isLoggedIn is the user logged in? | |
100 | * @param boolean $hidePublicLinks if true all links are private. | |
101 | * @param string $redirector link redirector set in user settings. | |
102 | * @param boolean $redirectorEncode Enable urlencode on redirected urls (default: true). | |
ca74886f | 103 | */ |
735ed4a9 | 104 | public function __construct( |
043eae70 A |
105 | $datastore, |
106 | $isLoggedIn, | |
107 | $hidePublicLinks, | |
108 | $redirector = '', | |
109 | $redirectorEncode = true | |
110 | ) | |
ca74886f | 111 | { |
628b97cb V |
112 | $this->datastore = $datastore; |
113 | $this->loggedIn = $isLoggedIn; | |
114 | $this->hidePublicLinks = $hidePublicLinks; | |
115 | $this->redirector = $redirector; | |
043eae70 | 116 | $this->redirectorEncode = $redirectorEncode === true; |
f21abf32 V |
117 | $this->check(); |
118 | $this->read(); | |
ca74886f V |
119 | } |
120 | ||
121 | /** | |
122 | * Countable - Counts elements of an object | |
123 | */ | |
124 | public function count() | |
125 | { | |
628b97cb | 126 | return count($this->links); |
ca74886f V |
127 | } |
128 | ||
129 | /** | |
130 | * ArrayAccess - Assigns a value to the specified offset | |
131 | */ | |
132 | public function offsetSet($offset, $value) | |
133 | { | |
134 | // TODO: use exceptions instead of "die" | |
628b97cb | 135 | if (!$this->loggedIn) { |
ca74886f V |
136 | die('You are not authorized to add a link.'); |
137 | } | |
29d10882 A |
138 | if (!isset($value['id']) || empty($value['url'])) { |
139 | die('Internal Error: A link should always have an id and URL.'); | |
ca74886f | 140 | } |
bc5f1597 | 141 | if (($offset !== null && ! is_int($offset)) || ! is_int($value['id'])) { |
29d10882 A |
142 | die('You must specify an integer as a key.'); |
143 | } | |
bc5f1597 | 144 | if ($offset !== null && $offset !== $value['id']) { |
29d10882 A |
145 | die('Array offset and link ID must be equal.'); |
146 | } | |
147 | ||
148 | // If the link exists, we reuse the real offset, otherwise new entry | |
149 | $existing = $this->getLinkOffset($offset); | |
150 | if ($existing !== null) { | |
151 | $offset = $existing; | |
152 | } else { | |
153 | $offset = count($this->links); | |
ca74886f | 154 | } |
628b97cb | 155 | $this->links[$offset] = $value; |
29d10882 A |
156 | $this->urls[$value['url']] = $offset; |
157 | $this->ids[$value['id']] = $offset; | |
ca74886f V |
158 | } |
159 | ||
160 | /** | |
161 | * ArrayAccess - Whether or not an offset exists | |
162 | */ | |
163 | public function offsetExists($offset) | |
164 | { | |
29d10882 | 165 | return array_key_exists($this->getLinkOffset($offset), $this->links); |
ca74886f V |
166 | } |
167 | ||
168 | /** | |
169 | * ArrayAccess - Unsets an offset | |
170 | */ | |
171 | public function offsetUnset($offset) | |
172 | { | |
628b97cb | 173 | if (!$this->loggedIn) { |
ca74886f V |
174 | // TODO: raise an exception |
175 | die('You are not authorized to delete a link.'); | |
176 | } | |
29d10882 A |
177 | $realOffset = $this->getLinkOffset($offset); |
178 | $url = $this->links[$realOffset]['url']; | |
628b97cb | 179 | unset($this->urls[$url]); |
29d10882 A |
180 | unset($this->ids[$realOffset]); |
181 | unset($this->links[$realOffset]); | |
ca74886f V |
182 | } |
183 | ||
184 | /** | |
185 | * ArrayAccess - Returns the value at specified offset | |
186 | */ | |
187 | public function offsetGet($offset) | |
188 | { | |
29d10882 A |
189 | $realOffset = $this->getLinkOffset($offset); |
190 | return isset($this->links[$realOffset]) ? $this->links[$realOffset] : null; | |
ca74886f V |
191 | } |
192 | ||
193 | /** | |
194 | * Iterator - Returns the current element | |
195 | */ | |
735ed4a9 | 196 | public function current() |
ca74886f | 197 | { |
29d10882 | 198 | return $this[$this->keys[$this->position]]; |
ca74886f V |
199 | } |
200 | ||
201 | /** | |
202 | * Iterator - Returns the key of the current element | |
203 | */ | |
735ed4a9 | 204 | public function key() |
ca74886f | 205 | { |
628b97cb | 206 | return $this->keys[$this->position]; |
ca74886f V |
207 | } |
208 | ||
209 | /** | |
210 | * Iterator - Moves forward to next element | |
211 | */ | |
735ed4a9 | 212 | public function next() |
ca74886f | 213 | { |
628b97cb | 214 | ++$this->position; |
ca74886f V |
215 | } |
216 | ||
217 | /** | |
218 | * Iterator - Rewinds the Iterator to the first element | |
219 | * | |
220 | * Entries are sorted by date (latest first) | |
221 | */ | |
735ed4a9 | 222 | public function rewind() |
ca74886f | 223 | { |
29d10882 | 224 | $this->keys = array_keys($this->ids); |
628b97cb | 225 | $this->position = 0; |
ca74886f V |
226 | } |
227 | ||
228 | /** | |
229 | * Iterator - Checks if current position is valid | |
230 | */ | |
735ed4a9 | 231 | public function valid() |
ca74886f | 232 | { |
628b97cb | 233 | return isset($this->keys[$this->position]); |
ca74886f V |
234 | } |
235 | ||
236 | /** | |
237 | * Checks if the DB directory and file exist | |
238 | * | |
239 | * If no DB file is found, creates a dummy DB. | |
240 | */ | |
f21abf32 | 241 | private function check() |
ca74886f | 242 | { |
628b97cb | 243 | if (file_exists($this->datastore)) { |
ca74886f V |
244 | return; |
245 | } | |
246 | ||
247 | // Create a dummy database for example | |
628b97cb | 248 | $this->links = array(); |
ca74886f | 249 | $link = array( |
29d10882 | 250 | 'id' => 1, |
598376d4 A |
251 | 'title'=>' Shaarli: the personal, minimalist, super-fast, no-database delicious clone', |
252 | 'url'=>'https://github.com/shaarli/Shaarli/wiki', | |
253 | 'description'=>'Welcome to Shaarli! This is your first public bookmark. To edit or delete me, you must first login. | |
254 | ||
255 | To learn how to use Shaarli, consult the link "Help/documentation" at the bottom of this page. | |
256 | ||
257 | You use the community supported version of the original Shaarli project, by Sebastien Sauvage.', | |
ca74886f | 258 | 'private'=>0, |
29d10882 | 259 | 'created'=> new DateTime(), |
ca74886f V |
260 | 'tags'=>'opensource software' |
261 | ); | |
d592daea | 262 | $link['shorturl'] = link_small_hash($link['created'], $link['id']); |
29d10882 | 263 | $this->links[1] = $link; |
ca74886f V |
264 | |
265 | $link = array( | |
29d10882 | 266 | 'id' => 0, |
ca74886f V |
267 | 'title'=>'My secret stuff... - Pastebin.com', |
268 | 'url'=>'http://sebsauvage.net/paste/?8434b27936c09649#bR7XsXhoTiLcqCpQbmOpBi3rq2zzQUC5hBI7ZT1O3x8=', | |
598376d4 | 269 | 'description'=>'Shhhh! I\'m a private link only YOU can see. You can delete me too.', |
ca74886f | 270 | 'private'=>1, |
29d10882 | 271 | 'created'=> new DateTime('1 minute ago'), |
d592daea | 272 | 'tags'=>'secretstuff', |
ca74886f | 273 | ); |
d592daea | 274 | $link['shorturl'] = link_small_hash($link['created'], $link['id']); |
29d10882 | 275 | $this->links[0] = $link; |
ca74886f V |
276 | |
277 | // Write database to disk | |
f21abf32 | 278 | $this->write(); |
ca74886f V |
279 | } |
280 | ||
281 | /** | |
282 | * Reads database from disk to memory | |
283 | */ | |
f21abf32 | 284 | private function read() |
ca74886f | 285 | { |
578a84bd | 286 | // Public links are hidden and user not logged in => nothing to show |
628b97cb V |
287 | if ($this->hidePublicLinks && !$this->loggedIn) { |
288 | $this->links = array(); | |
578a84bd | 289 | return; |
290 | } | |
291 | ||
b2306b0c | 292 | $this->links = FileUtils::readFlatDB($this->datastore, []); |
ca74886f | 293 | |
29d10882 A |
294 | $toremove = array(); |
295 | foreach ($this->links as $key => &$link) { | |
296 | if (! $this->loggedIn && $link['private'] != 0) { | |
297 | // Transition for not upgraded databases. | |
298 | $toremove[] = $key; | |
299 | continue; | |
ca74886f | 300 | } |
195acf9f | 301 | |
510377d2 | 302 | // Sanitize data fields. |
90e5bd65 | 303 | sanitizeLink($link); |
195acf9f A |
304 | |
305 | // Remove private tags if the user is not logged in. | |
628b97cb | 306 | if (! $this->loggedIn) { |
9866b408 | 307 | $link['tags'] = preg_replace('/(^|\s+)\.[^($|\s)]+\s*/', ' ', $link['tags']); |
195acf9f A |
308 | } |
309 | ||
90e5bd65 | 310 | // Do not use the redirector for internal links (Shaarli note URL starting with a '?'). |
628b97cb V |
311 | if (!empty($this->redirector) && !startsWith($link['url'], '?')) { |
312 | $link['real_url'] = $this->redirector; | |
043eae70 A |
313 | if ($this->redirectorEncode) { |
314 | $link['real_url'] .= urlencode(unescape($link['url'])); | |
315 | } else { | |
316 | $link['real_url'] .= $link['url']; | |
317 | } | |
90e5bd65 A |
318 | } |
319 | else { | |
320 | $link['real_url'] = $link['url']; | |
321 | } | |
29d10882 A |
322 | |
323 | // To be able to load links before running the update, and prepare the update | |
324 | if (! isset($link['created'])) { | |
325 | $link['id'] = $link['linkdate']; | |
d592daea | 326 | $link['created'] = DateTime::createFromFormat(self::LINK_DATE_FORMAT, $link['linkdate']); |
29d10882 | 327 | if (! empty($link['updated'])) { |
d592daea | 328 | $link['updated'] = DateTime::createFromFormat(self::LINK_DATE_FORMAT, $link['updated']); |
29d10882 | 329 | } |
d592daea | 330 | $link['shorturl'] = smallHash($link['linkdate']); |
29d10882 A |
331 | } |
332 | } | |
333 | ||
334 | // If user is not logged in, filter private links. | |
335 | foreach ($toremove as $offset) { | |
336 | unset($this->links[$offset]); | |
5f85fcd8 | 337 | } |
29d10882 A |
338 | |
339 | $this->reorder(); | |
ca74886f V |
340 | } |
341 | ||
2e28269b V |
342 | /** |
343 | * Saves the database from memory to disk | |
344 | * | |
345 | * @throws IOException the datastore is not writable | |
346 | */ | |
f21abf32 | 347 | private function write() |
2e28269b | 348 | { |
b2306b0c | 349 | FileUtils::writeFlatDB($this->datastore, $this->links); |
2e28269b V |
350 | } |
351 | ||
ca74886f V |
352 | /** |
353 | * Saves the database from memory to disk | |
01e48f26 V |
354 | * |
355 | * @param string $pageCacheDir page cache directory | |
ca74886f | 356 | */ |
f21abf32 | 357 | public function save($pageCacheDir) |
ca74886f | 358 | { |
628b97cb | 359 | if (!$this->loggedIn) { |
ca74886f V |
360 | // TODO: raise an Exception instead |
361 | die('You are not authorized to change the database.'); | |
362 | } | |
2e28269b | 363 | |
f21abf32 | 364 | $this->write(); |
2e28269b | 365 | |
01e48f26 | 366 | invalidateCaches($pageCacheDir); |
ca74886f V |
367 | } |
368 | ||
369 | /** | |
370 | * Returns the link for a given URL, or False if it does not exist. | |
ef591e7e GV |
371 | * |
372 | * @param string $url URL to search for | |
373 | * | |
374 | * @return mixed the existing link if it exists, else 'false' | |
ca74886f V |
375 | */ |
376 | public function getLinkFromUrl($url) | |
377 | { | |
628b97cb V |
378 | if (isset($this->urls[$url])) { |
379 | return $this->links[$this->urls[$url]]; | |
ca74886f V |
380 | } |
381 | return false; | |
382 | } | |
383 | ||
384 | /** | |
528a6f8a | 385 | * Returns the shaare corresponding to a smallHash. |
ca74886f | 386 | * |
528a6f8a A |
387 | * @param string $request QUERY_STRING server parameter. |
388 | * | |
389 | * @return array $filtered array containing permalink data. | |
390 | * | |
391 | * @throws LinkNotFoundException if the smallhash is malformed or doesn't match any link. | |
392 | */ | |
393 | public function filterHash($request) | |
394 | { | |
395 | $request = substr($request, 0, 6); | |
628b97cb | 396 | $linkFilter = new LinkFilter($this->links); |
528a6f8a A |
397 | return $linkFilter->filter(LinkFilter::$FILTER_HASH, $request); |
398 | } | |
399 | ||
400 | /** | |
401 | * Returns the list of articles for a given day. | |
402 | * | |
403 | * @param string $request day to filter. Format: YYYYMMDD. | |
404 | * | |
405 | * @return array list of shaare found. | |
406 | */ | |
407 | public function filterDay($request) { | |
628b97cb | 408 | $linkFilter = new LinkFilter($this->links); |
528a6f8a A |
409 | return $linkFilter->filter(LinkFilter::$FILTER_DAY, $request); |
410 | } | |
411 | ||
412 | /** | |
413 | * Filter links according to search parameters. | |
414 | * | |
415 | * @param array $filterRequest Search request content. Supported keys: | |
416 | * - searchtags: list of tags | |
417 | * - searchterm: term search | |
822bffce | 418 | * @param bool $casesensitive Optional: Perform case sensitive filter |
7f96d9ec | 419 | * @param string $visibility return only all/private/public links |
f210d94f | 420 | * @param string $untaggedonly return only untagged links |
ca74886f | 421 | * |
528a6f8a | 422 | * @return array filtered links, all links if no suitable filter was provided. |
ca74886f | 423 | */ |
f210d94f | 424 | public function filterSearch($filterRequest = array(), $casesensitive = false, $visibility = 'all', $untaggedonly = false) |
55d0a5c4 | 425 | { |
528a6f8a | 426 | // Filter link database according to parameters. |
7d86f40b A |
427 | $searchtags = isset($filterRequest['searchtags']) ? escape($filterRequest['searchtags']) : ''; |
428 | $searchterm = isset($filterRequest['searchterm']) ? escape($filterRequest['searchterm']) : ''; | |
528a6f8a | 429 | |
7d86f40b | 430 | // Search tags + fullsearch - blank string parameter will return all links. |
f210d94f | 431 | $type = LinkFilter::$FILTER_TAG | LinkFilter::$FILTER_TEXT; // == "vuotext" |
7d86f40b | 432 | $request = [$searchtags, $searchterm]; |
528a6f8a | 433 | |
29d10882 | 434 | $linkFilter = new LinkFilter($this); |
f210d94f | 435 | return $linkFilter->filter($type, $request, $casesensitive, $visibility, $untaggedonly); |
ca74886f V |
436 | } |
437 | ||
438 | /** | |
6ccd0b21 LC |
439 | * Returns the list tags appearing in the links with the given tags |
440 | * @param $filteringTags: tags selecting the links to consider | |
441 | * @param $visibility: process only all/private/public links | |
442 | * @return: a tag=>linksCount array | |
ca74886f | 443 | */ |
6ccd0b21 | 444 | public function linksCountPerTag($filteringTags = [], $visibility = 'all') |
ca74886f | 445 | { |
6ccd0b21 | 446 | $links = empty($filteringTags) ? $this->links : $this->filterSearch(['searchtags' => $filteringTags], false, $visibility); |
ca74886f | 447 | $tags = array(); |
b1eb5d1d | 448 | $caseMapping = array(); |
6ccd0b21 | 449 | foreach ($links as $link) { |
4b35853d | 450 | foreach (preg_split('/\s+/', $link['tags'], 0, PREG_SPLIT_NO_EMPTY) as $tag) { |
b1eb5d1d A |
451 | if (empty($tag)) { |
452 | continue; | |
ca74886f | 453 | } |
b1eb5d1d A |
454 | // The first case found will be displayed. |
455 | if (!isset($caseMapping[strtolower($tag)])) { | |
456 | $caseMapping[strtolower($tag)] = $tag; | |
457 | $tags[$caseMapping[strtolower($tag)]] = 0; | |
458 | } | |
459 | $tags[$caseMapping[strtolower($tag)]]++; | |
ca74886f V |
460 | } |
461 | } | |
462 | // Sort tags by usage (most used tag first) | |
463 | arsort($tags); | |
464 | return $tags; | |
465 | } | |
466 | ||
3b67b222 A |
467 | /** |
468 | * Rename or delete a tag across all links. | |
469 | * | |
470 | * @param string $from Tag to rename | |
471 | * @param string $to New tag. If none is provided, the from tag will be deleted | |
472 | * | |
473 | * @return array|bool List of altered links or false on error | |
474 | */ | |
475 | public function renameTag($from, $to) | |
476 | { | |
477 | if (empty($from)) { | |
478 | return false; | |
479 | } | |
480 | $delete = empty($to); | |
481 | // True for case-sensitive tag search. | |
482 | $linksToAlter = $this->filterSearch(['searchtags' => $from], true); | |
483 | foreach($linksToAlter as $key => &$value) | |
484 | { | |
485 | $tags = preg_split('/\s+/', trim($value['tags'])); | |
486 | if (($pos = array_search($from, $tags)) !== false) { | |
487 | if ($delete) { | |
488 | unset($tags[$pos]); // Remove tag. | |
489 | } else { | |
490 | $tags[$pos] = trim($to); | |
491 | } | |
492 | $value['tags'] = trim(implode(' ', array_unique($tags))); | |
493 | $this[$value['id']] = $value; | |
494 | } | |
495 | } | |
496 | ||
497 | return $linksToAlter; | |
498 | } | |
499 | ||
ca74886f V |
500 | /** |
501 | * Returns the list of days containing articles (oldest first) | |
502 | * Output: An array containing days (in format YYYYMMDD). | |
503 | */ | |
504 | public function days() | |
505 | { | |
506 | $linkDays = array(); | |
29d10882 A |
507 | foreach ($this->links as $link) { |
508 | $linkDays[$link['created']->format('Ymd')] = 0; | |
ca74886f V |
509 | } |
510 | $linkDays = array_keys($linkDays); | |
511 | sort($linkDays); | |
510377d2 | 512 | |
ca74886f V |
513 | return $linkDays; |
514 | } | |
29d10882 A |
515 | |
516 | /** | |
517 | * Reorder links by creation date (newest first). | |
518 | * | |
519 | * Also update the urls and ids mapping arrays. | |
520 | * | |
521 | * @param string $order ASC|DESC | |
522 | */ | |
523 | public function reorder($order = 'DESC') | |
524 | { | |
525 | $order = $order === 'ASC' ? -1 : 1; | |
526 | // Reorder array by dates. | |
527 | usort($this->links, function($a, $b) use ($order) { | |
528 | return $a['created'] < $b['created'] ? 1 * $order : -1 * $order; | |
529 | }); | |
530 | ||
531 | $this->urls = array(); | |
532 | $this->ids = array(); | |
533 | foreach ($this->links as $key => $link) { | |
534 | $this->urls[$link['url']] = $key; | |
535 | $this->ids[$link['id']] = $key; | |
536 | } | |
537 | } | |
538 | ||
539 | /** | |
540 | * Return the next key for link creation. | |
541 | * E.g. If the last ID is 597, the next will be 598. | |
542 | * | |
543 | * @return int next ID. | |
544 | */ | |
545 | public function getNextId() | |
546 | { | |
547 | if (!empty($this->ids)) { | |
548 | return max(array_keys($this->ids)) + 1; | |
549 | } | |
550 | return 0; | |
551 | } | |
552 | ||
553 | /** | |
554 | * Returns a link offset in links array from its unique ID. | |
555 | * | |
556 | * @param int $id Persistent ID of a link. | |
557 | * | |
d592daea | 558 | * @return int Real offset in local array, or null if doesn't exist. |
29d10882 A |
559 | */ |
560 | protected function getLinkOffset($id) | |
561 | { | |
562 | if (isset($this->ids[$id])) { | |
563 | return $this->ids[$id]; | |
564 | } | |
565 | return null; | |
566 | } | |
ca74886f | 567 | } |