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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 | ||
9c8752a2 V |
53 | // Datastore PHP prefix |
54 | protected static $phpPrefix = '<?php /* '; | |
55 | ||
56 | // Datastore PHP suffix | |
57 | protected static $phpSuffix = ' */ ?>'; | |
58 | ||
ca74886f V |
59 | // List of links (associative array) |
60 | // - key: link date (e.g. "20110823_124546"), | |
61 | // - value: associative array (keys: title, description...) | |
628b97cb | 62 | private $links; |
ca74886f | 63 | |
29d10882 A |
64 | // List of all recorded URLs (key=url, value=link offset) |
65 | // for fast reserve search (url-->link offset) | |
628b97cb | 66 | private $urls; |
ca74886f | 67 | |
29d10882 A |
68 | /** |
69 | * @var array List of all links IDS mapped with their array offset. | |
70 | * Map: id->offset. | |
71 | */ | |
72 | protected $ids; | |
73 | ||
74 | // List of offset keys (for the Iterator interface implementation) | |
628b97cb | 75 | private $keys; |
ca74886f | 76 | |
628b97cb V |
77 | // Position in the $this->keys array (for the Iterator interface) |
78 | private $position; | |
ca74886f V |
79 | |
80 | // Is the user logged in? (used to filter private links) | |
628b97cb | 81 | private $loggedIn; |
ca74886f | 82 | |
9f15ca9e | 83 | // Hide public links |
628b97cb | 84 | private $hidePublicLinks; |
9f15ca9e | 85 | |
90e5bd65 | 86 | // link redirector set in user settings. |
628b97cb | 87 | private $redirector; |
90e5bd65 | 88 | |
043eae70 A |
89 | /** |
90 | * Set this to `true` to urlencode link behind redirector link, `false` to leave it untouched. | |
91 | * | |
92 | * Example: | |
93 | * anonym.to needs clean URL while dereferer.org needs urlencoded URL. | |
94 | * | |
95 | * @var boolean $redirectorEncode parameter: true or false | |
96 | */ | |
97 | private $redirectorEncode; | |
98 | ||
ca74886f V |
99 | /** |
100 | * Creates a new LinkDB | |
101 | * | |
102 | * Checks if the datastore exists; else, attempts to create a dummy one. | |
103 | * | |
043eae70 A |
104 | * @param string $datastore datastore file path. |
105 | * @param boolean $isLoggedIn is the user logged in? | |
106 | * @param boolean $hidePublicLinks if true all links are private. | |
107 | * @param string $redirector link redirector set in user settings. | |
108 | * @param boolean $redirectorEncode Enable urlencode on redirected urls (default: true). | |
ca74886f | 109 | */ |
735ed4a9 | 110 | public function __construct( |
043eae70 A |
111 | $datastore, |
112 | $isLoggedIn, | |
113 | $hidePublicLinks, | |
114 | $redirector = '', | |
115 | $redirectorEncode = true | |
116 | ) | |
ca74886f | 117 | { |
628b97cb V |
118 | $this->datastore = $datastore; |
119 | $this->loggedIn = $isLoggedIn; | |
120 | $this->hidePublicLinks = $hidePublicLinks; | |
121 | $this->redirector = $redirector; | |
043eae70 | 122 | $this->redirectorEncode = $redirectorEncode === true; |
f21abf32 V |
123 | $this->check(); |
124 | $this->read(); | |
ca74886f V |
125 | } |
126 | ||
127 | /** | |
128 | * Countable - Counts elements of an object | |
129 | */ | |
130 | public function count() | |
131 | { | |
628b97cb | 132 | return count($this->links); |
ca74886f V |
133 | } |
134 | ||
135 | /** | |
136 | * ArrayAccess - Assigns a value to the specified offset | |
137 | */ | |
138 | public function offsetSet($offset, $value) | |
139 | { | |
140 | // TODO: use exceptions instead of "die" | |
628b97cb | 141 | if (!$this->loggedIn) { |
ca74886f V |
142 | die('You are not authorized to add a link.'); |
143 | } | |
29d10882 A |
144 | if (!isset($value['id']) || empty($value['url'])) { |
145 | die('Internal Error: A link should always have an id and URL.'); | |
ca74886f | 146 | } |
29d10882 A |
147 | if ((! empty($offset) && ! is_int($offset)) || ! is_int($value['id'])) { |
148 | die('You must specify an integer as a key.'); | |
149 | } | |
150 | if (! empty($offset) && $offset !== $value['id']) { | |
151 | die('Array offset and link ID must be equal.'); | |
152 | } | |
153 | ||
154 | // If the link exists, we reuse the real offset, otherwise new entry | |
155 | $existing = $this->getLinkOffset($offset); | |
156 | if ($existing !== null) { | |
157 | $offset = $existing; | |
158 | } else { | |
159 | $offset = count($this->links); | |
ca74886f | 160 | } |
628b97cb | 161 | $this->links[$offset] = $value; |
29d10882 A |
162 | $this->urls[$value['url']] = $offset; |
163 | $this->ids[$value['id']] = $offset; | |
ca74886f V |
164 | } |
165 | ||
166 | /** | |
167 | * ArrayAccess - Whether or not an offset exists | |
168 | */ | |
169 | public function offsetExists($offset) | |
170 | { | |
29d10882 | 171 | return array_key_exists($this->getLinkOffset($offset), $this->links); |
ca74886f V |
172 | } |
173 | ||
174 | /** | |
175 | * ArrayAccess - Unsets an offset | |
176 | */ | |
177 | public function offsetUnset($offset) | |
178 | { | |
628b97cb | 179 | if (!$this->loggedIn) { |
ca74886f V |
180 | // TODO: raise an exception |
181 | die('You are not authorized to delete a link.'); | |
182 | } | |
29d10882 A |
183 | $realOffset = $this->getLinkOffset($offset); |
184 | $url = $this->links[$realOffset]['url']; | |
628b97cb | 185 | unset($this->urls[$url]); |
29d10882 A |
186 | unset($this->ids[$realOffset]); |
187 | unset($this->links[$realOffset]); | |
ca74886f V |
188 | } |
189 | ||
190 | /** | |
191 | * ArrayAccess - Returns the value at specified offset | |
192 | */ | |
193 | public function offsetGet($offset) | |
194 | { | |
29d10882 A |
195 | $realOffset = $this->getLinkOffset($offset); |
196 | return isset($this->links[$realOffset]) ? $this->links[$realOffset] : null; | |
ca74886f V |
197 | } |
198 | ||
199 | /** | |
200 | * Iterator - Returns the current element | |
201 | */ | |
735ed4a9 | 202 | public function current() |
ca74886f | 203 | { |
29d10882 | 204 | return $this[$this->keys[$this->position]]; |
ca74886f V |
205 | } |
206 | ||
207 | /** | |
208 | * Iterator - Returns the key of the current element | |
209 | */ | |
735ed4a9 | 210 | public function key() |
ca74886f | 211 | { |
628b97cb | 212 | return $this->keys[$this->position]; |
ca74886f V |
213 | } |
214 | ||
215 | /** | |
216 | * Iterator - Moves forward to next element | |
217 | */ | |
735ed4a9 | 218 | public function next() |
ca74886f | 219 | { |
628b97cb | 220 | ++$this->position; |
ca74886f V |
221 | } |
222 | ||
223 | /** | |
224 | * Iterator - Rewinds the Iterator to the first element | |
225 | * | |
226 | * Entries are sorted by date (latest first) | |
227 | */ | |
735ed4a9 | 228 | public function rewind() |
ca74886f | 229 | { |
29d10882 | 230 | $this->keys = array_keys($this->ids); |
628b97cb | 231 | $this->position = 0; |
ca74886f V |
232 | } |
233 | ||
234 | /** | |
235 | * Iterator - Checks if current position is valid | |
236 | */ | |
735ed4a9 | 237 | public function valid() |
ca74886f | 238 | { |
628b97cb | 239 | return isset($this->keys[$this->position]); |
ca74886f V |
240 | } |
241 | ||
242 | /** | |
243 | * Checks if the DB directory and file exist | |
244 | * | |
245 | * If no DB file is found, creates a dummy DB. | |
246 | */ | |
f21abf32 | 247 | private function check() |
ca74886f | 248 | { |
628b97cb | 249 | if (file_exists($this->datastore)) { |
ca74886f V |
250 | return; |
251 | } | |
252 | ||
253 | // Create a dummy database for example | |
628b97cb | 254 | $this->links = array(); |
ca74886f | 255 | $link = array( |
29d10882 | 256 | 'id' => 1, |
598376d4 A |
257 | 'title'=>' Shaarli: the personal, minimalist, super-fast, no-database delicious clone', |
258 | 'url'=>'https://github.com/shaarli/Shaarli/wiki', | |
259 | 'description'=>'Welcome to Shaarli! This is your first public bookmark. To edit or delete me, you must first login. | |
260 | ||
261 | To learn how to use Shaarli, consult the link "Help/documentation" at the bottom of this page. | |
262 | ||
263 | You use the community supported version of the original Shaarli project, by Sebastien Sauvage.', | |
ca74886f | 264 | 'private'=>0, |
29d10882 | 265 | 'created'=> new DateTime(), |
ca74886f V |
266 | 'tags'=>'opensource software' |
267 | ); | |
d592daea | 268 | $link['shorturl'] = link_small_hash($link['created'], $link['id']); |
29d10882 | 269 | $this->links[1] = $link; |
ca74886f V |
270 | |
271 | $link = array( | |
29d10882 | 272 | 'id' => 0, |
ca74886f V |
273 | 'title'=>'My secret stuff... - Pastebin.com', |
274 | 'url'=>'http://sebsauvage.net/paste/?8434b27936c09649#bR7XsXhoTiLcqCpQbmOpBi3rq2zzQUC5hBI7ZT1O3x8=', | |
598376d4 | 275 | 'description'=>'Shhhh! I\'m a private link only YOU can see. You can delete me too.', |
ca74886f | 276 | 'private'=>1, |
29d10882 | 277 | 'created'=> new DateTime('1 minute ago'), |
d592daea | 278 | 'tags'=>'secretstuff', |
ca74886f | 279 | ); |
d592daea | 280 | $link['shorturl'] = link_small_hash($link['created'], $link['id']); |
29d10882 | 281 | $this->links[0] = $link; |
ca74886f V |
282 | |
283 | // Write database to disk | |
f21abf32 | 284 | $this->write(); |
ca74886f V |
285 | } |
286 | ||
287 | /** | |
288 | * Reads database from disk to memory | |
289 | */ | |
f21abf32 | 290 | private function read() |
ca74886f | 291 | { |
578a84bd | 292 | // Public links are hidden and user not logged in => nothing to show |
628b97cb V |
293 | if ($this->hidePublicLinks && !$this->loggedIn) { |
294 | $this->links = array(); | |
578a84bd | 295 | return; |
296 | } | |
297 | ||
ca74886f V |
298 | // Read data |
299 | // Note that gzinflate is faster than gzuncompress. | |
300 | // See: http://www.php.net/manual/en/function.gzdeflate.php#96439 | |
628b97cb | 301 | $this->links = array(); |
ca74886f | 302 | |
628b97cb V |
303 | if (file_exists($this->datastore)) { |
304 | $this->links = unserialize(gzinflate(base64_decode( | |
305 | substr(file_get_contents($this->datastore), | |
9c8752a2 | 306 | strlen(self::$phpPrefix), -strlen(self::$phpSuffix))))); |
ca74886f V |
307 | } |
308 | ||
29d10882 A |
309 | $toremove = array(); |
310 | foreach ($this->links as $key => &$link) { | |
311 | if (! $this->loggedIn && $link['private'] != 0) { | |
312 | // Transition for not upgraded databases. | |
313 | $toremove[] = $key; | |
314 | continue; | |
ca74886f | 315 | } |
195acf9f | 316 | |
510377d2 | 317 | // Sanitize data fields. |
90e5bd65 | 318 | sanitizeLink($link); |
195acf9f A |
319 | |
320 | // Remove private tags if the user is not logged in. | |
628b97cb | 321 | if (! $this->loggedIn) { |
9866b408 | 322 | $link['tags'] = preg_replace('/(^|\s+)\.[^($|\s)]+\s*/', ' ', $link['tags']); |
195acf9f A |
323 | } |
324 | ||
90e5bd65 | 325 | // Do not use the redirector for internal links (Shaarli note URL starting with a '?'). |
628b97cb V |
326 | if (!empty($this->redirector) && !startsWith($link['url'], '?')) { |
327 | $link['real_url'] = $this->redirector; | |
043eae70 A |
328 | if ($this->redirectorEncode) { |
329 | $link['real_url'] .= urlencode(unescape($link['url'])); | |
330 | } else { | |
331 | $link['real_url'] .= $link['url']; | |
332 | } | |
90e5bd65 A |
333 | } |
334 | else { | |
335 | $link['real_url'] = $link['url']; | |
336 | } | |
29d10882 A |
337 | |
338 | // To be able to load links before running the update, and prepare the update | |
339 | if (! isset($link['created'])) { | |
340 | $link['id'] = $link['linkdate']; | |
d592daea | 341 | $link['created'] = DateTime::createFromFormat(self::LINK_DATE_FORMAT, $link['linkdate']); |
29d10882 | 342 | if (! empty($link['updated'])) { |
d592daea | 343 | $link['updated'] = DateTime::createFromFormat(self::LINK_DATE_FORMAT, $link['updated']); |
29d10882 | 344 | } |
d592daea | 345 | $link['shorturl'] = smallHash($link['linkdate']); |
29d10882 A |
346 | } |
347 | } | |
348 | ||
349 | // If user is not logged in, filter private links. | |
350 | foreach ($toremove as $offset) { | |
351 | unset($this->links[$offset]); | |
5f85fcd8 | 352 | } |
29d10882 A |
353 | |
354 | $this->reorder(); | |
ca74886f V |
355 | } |
356 | ||
2e28269b V |
357 | /** |
358 | * Saves the database from memory to disk | |
359 | * | |
360 | * @throws IOException the datastore is not writable | |
361 | */ | |
f21abf32 | 362 | private function write() |
2e28269b | 363 | { |
628b97cb | 364 | if (is_file($this->datastore) && !is_writeable($this->datastore)) { |
2e28269b | 365 | // The datastore exists but is not writeable |
628b97cb V |
366 | throw new IOException($this->datastore); |
367 | } else if (!is_file($this->datastore) && !is_writeable(dirname($this->datastore))) { | |
2e28269b | 368 | // The datastore does not exist and its parent directory is not writeable |
628b97cb | 369 | throw new IOException(dirname($this->datastore)); |
2e28269b V |
370 | } |
371 | ||
372 | file_put_contents( | |
628b97cb V |
373 | $this->datastore, |
374 | self::$phpPrefix.base64_encode(gzdeflate(serialize($this->links))).self::$phpSuffix | |
2e28269b V |
375 | ); |
376 | ||
377 | } | |
378 | ||
ca74886f V |
379 | /** |
380 | * Saves the database from memory to disk | |
01e48f26 V |
381 | * |
382 | * @param string $pageCacheDir page cache directory | |
ca74886f | 383 | */ |
f21abf32 | 384 | public function save($pageCacheDir) |
ca74886f | 385 | { |
628b97cb | 386 | if (!$this->loggedIn) { |
ca74886f V |
387 | // TODO: raise an Exception instead |
388 | die('You are not authorized to change the database.'); | |
389 | } | |
2e28269b | 390 | |
f21abf32 | 391 | $this->write(); |
2e28269b | 392 | |
01e48f26 | 393 | invalidateCaches($pageCacheDir); |
ca74886f V |
394 | } |
395 | ||
396 | /** | |
397 | * Returns the link for a given URL, or False if it does not exist. | |
ef591e7e GV |
398 | * |
399 | * @param string $url URL to search for | |
400 | * | |
401 | * @return mixed the existing link if it exists, else 'false' | |
ca74886f V |
402 | */ |
403 | public function getLinkFromUrl($url) | |
404 | { | |
628b97cb V |
405 | if (isset($this->urls[$url])) { |
406 | return $this->links[$this->urls[$url]]; | |
ca74886f V |
407 | } |
408 | return false; | |
409 | } | |
410 | ||
411 | /** | |
528a6f8a | 412 | * Returns the shaare corresponding to a smallHash. |
ca74886f | 413 | * |
528a6f8a A |
414 | * @param string $request QUERY_STRING server parameter. |
415 | * | |
416 | * @return array $filtered array containing permalink data. | |
417 | * | |
418 | * @throws LinkNotFoundException if the smallhash is malformed or doesn't match any link. | |
419 | */ | |
420 | public function filterHash($request) | |
421 | { | |
422 | $request = substr($request, 0, 6); | |
628b97cb | 423 | $linkFilter = new LinkFilter($this->links); |
528a6f8a A |
424 | return $linkFilter->filter(LinkFilter::$FILTER_HASH, $request); |
425 | } | |
426 | ||
427 | /** | |
428 | * Returns the list of articles for a given day. | |
429 | * | |
430 | * @param string $request day to filter. Format: YYYYMMDD. | |
431 | * | |
432 | * @return array list of shaare found. | |
433 | */ | |
434 | public function filterDay($request) { | |
628b97cb | 435 | $linkFilter = new LinkFilter($this->links); |
528a6f8a A |
436 | return $linkFilter->filter(LinkFilter::$FILTER_DAY, $request); |
437 | } | |
438 | ||
439 | /** | |
440 | * Filter links according to search parameters. | |
441 | * | |
442 | * @param array $filterRequest Search request content. Supported keys: | |
443 | * - searchtags: list of tags | |
444 | * - searchterm: term search | |
822bffce A |
445 | * @param bool $casesensitive Optional: Perform case sensitive filter |
446 | * @param bool $privateonly Optional: Returns private links only if true. | |
ca74886f | 447 | * |
528a6f8a | 448 | * @return array filtered links, all links if no suitable filter was provided. |
ca74886f | 449 | */ |
528a6f8a | 450 | public function filterSearch($filterRequest = array(), $casesensitive = false, $privateonly = false) |
55d0a5c4 | 451 | { |
528a6f8a A |
452 | // Filter link database according to parameters. |
453 | $searchtags = !empty($filterRequest['searchtags']) ? escape($filterRequest['searchtags']) : ''; | |
454 | $searchterm = !empty($filterRequest['searchterm']) ? escape($filterRequest['searchterm']) : ''; | |
455 | ||
456 | // Search tags + fullsearch. | |
9ccca401 | 457 | if (! empty($searchtags) && ! empty($searchterm)) { |
528a6f8a A |
458 | $type = LinkFilter::$FILTER_TAG | LinkFilter::$FILTER_TEXT; |
459 | $request = array($searchtags, $searchterm); | |
460 | } | |
461 | // Search by tags. | |
462 | elseif (! empty($searchtags)) { | |
463 | $type = LinkFilter::$FILTER_TAG; | |
464 | $request = $searchtags; | |
465 | } | |
466 | // Fulltext search. | |
467 | elseif (! empty($searchterm)) { | |
468 | $type = LinkFilter::$FILTER_TEXT; | |
469 | $request = $searchterm; | |
470 | } | |
471 | // Otherwise, display without filtering. | |
472 | else { | |
473 | $type = ''; | |
474 | $request = ''; | |
475 | } | |
476 | ||
29d10882 | 477 | $linkFilter = new LinkFilter($this); |
c51fae92 | 478 | return $linkFilter->filter($type, $request, $casesensitive, $privateonly); |
ca74886f V |
479 | } |
480 | ||
481 | /** | |
482 | * Returns the list of all tags | |
483 | * Output: associative array key=tags, value=0 | |
484 | */ | |
485 | public function allTags() | |
486 | { | |
487 | $tags = array(); | |
b1eb5d1d | 488 | $caseMapping = array(); |
628b97cb | 489 | foreach ($this->links as $link) { |
4b35853d | 490 | foreach (preg_split('/\s+/', $link['tags'], 0, PREG_SPLIT_NO_EMPTY) as $tag) { |
b1eb5d1d A |
491 | if (empty($tag)) { |
492 | continue; | |
ca74886f | 493 | } |
b1eb5d1d A |
494 | // The first case found will be displayed. |
495 | if (!isset($caseMapping[strtolower($tag)])) { | |
496 | $caseMapping[strtolower($tag)] = $tag; | |
497 | $tags[$caseMapping[strtolower($tag)]] = 0; | |
498 | } | |
499 | $tags[$caseMapping[strtolower($tag)]]++; | |
ca74886f V |
500 | } |
501 | } | |
502 | // Sort tags by usage (most used tag first) | |
503 | arsort($tags); | |
504 | return $tags; | |
505 | } | |
506 | ||
507 | /** | |
508 | * Returns the list of days containing articles (oldest first) | |
509 | * Output: An array containing days (in format YYYYMMDD). | |
510 | */ | |
511 | public function days() | |
512 | { | |
513 | $linkDays = array(); | |
29d10882 A |
514 | foreach ($this->links as $link) { |
515 | $linkDays[$link['created']->format('Ymd')] = 0; | |
ca74886f V |
516 | } |
517 | $linkDays = array_keys($linkDays); | |
518 | sort($linkDays); | |
510377d2 | 519 | |
ca74886f V |
520 | return $linkDays; |
521 | } | |
29d10882 A |
522 | |
523 | /** | |
524 | * Reorder links by creation date (newest first). | |
525 | * | |
526 | * Also update the urls and ids mapping arrays. | |
527 | * | |
528 | * @param string $order ASC|DESC | |
529 | */ | |
530 | public function reorder($order = 'DESC') | |
531 | { | |
532 | $order = $order === 'ASC' ? -1 : 1; | |
533 | // Reorder array by dates. | |
534 | usort($this->links, function($a, $b) use ($order) { | |
535 | return $a['created'] < $b['created'] ? 1 * $order : -1 * $order; | |
536 | }); | |
537 | ||
538 | $this->urls = array(); | |
539 | $this->ids = array(); | |
540 | foreach ($this->links as $key => $link) { | |
541 | $this->urls[$link['url']] = $key; | |
542 | $this->ids[$link['id']] = $key; | |
543 | } | |
544 | } | |
545 | ||
546 | /** | |
547 | * Return the next key for link creation. | |
548 | * E.g. If the last ID is 597, the next will be 598. | |
549 | * | |
550 | * @return int next ID. | |
551 | */ | |
552 | public function getNextId() | |
553 | { | |
554 | if (!empty($this->ids)) { | |
555 | return max(array_keys($this->ids)) + 1; | |
556 | } | |
557 | return 0; | |
558 | } | |
559 | ||
560 | /** | |
561 | * Returns a link offset in links array from its unique ID. | |
562 | * | |
563 | * @param int $id Persistent ID of a link. | |
564 | * | |
d592daea | 565 | * @return int Real offset in local array, or null if doesn't exist. |
29d10882 A |
566 | */ |
567 | protected function getLinkOffset($id) | |
568 | { | |
569 | if (isset($this->ids[$id])) { | |
570 | return $this->ids[$id]; | |
571 | } | |
572 | return null; | |
573 | } | |
ca74886f | 574 | } |