2 rcs_id('$Id: WikiDB.php,v 1.10 2002-02-08 20:30:48 lakka Exp $');
4 //FIXME: arg on get*Revision to hint that content is wanted.
6 define('WIKIDB_FORCE_CREATE', -1);
8 // FIXME: used for debugging only. Comment out if cache does not work
12 * Abstract base class for the database used by PhpWiki.
14 * A <tt>WikiDB</tt> is a container for <tt>WikiDB_Page</tt>s which in
15 * turn contain <tt>WikiDB_PageRevision</tt>s.
17 * Conceptually a <tt>WikiDB</tt> contains all possible
18 * <tt>WikiDB_Page</tt>s, whether they have been initialized or not.
19 * Since all possible pages are already contained in a WikiDB, a call
20 * to WikiDB::getPage() will never fail (barring bugs and
21 * e.g. filesystem or SQL database problems.)
23 * Also each <tt>WikiDB_Page</tt> always contains at least one
24 * <tt>WikiDB_PageRevision</tt>: the default content (e.g. "Describe
25 * [PageName] here."). This default content has a version number of
28 * <tt>WikiDB_PageRevision</tt>s have read-only semantics. One can
29 * only create new revisions or delete old ones --- one can not modify
30 * an existing revision.
34 * Open a WikiDB database.
36 * This is a static member function. This function inspects its
37 * arguments to determine the proper subclass of WikiDB to
38 * instantiate, and then it instantiates it.
42 * @param $dbparams hash Database configuration parameters.
43 * Some pertinent paramters are:
46 * <dd> The back-end type. Current supported types are:
49 * <dd> Generic SQL backend based on the PEAR/DB database abstraction
52 * <dd> Dba based backend.
56 * <dd> (Used by the SQL backend.)
57 * The DSN specifying which database to connect to.
60 * <dd> Prefix to be prepended to database table (and file names).
63 * <dd> (Used by the dba backend.)
64 * Which directory db files reside in.
67 * <dd> (Used by the dba backend.)
68 * Timeout in seconds for opening (and obtaining lock) on the
72 * <dd> (Used by the dba backend.)
74 * Which dba handler to use. Good choices are probably either
78 * @return object A WikiDB object.
80 function open ($dbparams) {
81 $dbtype = $dbparams{'dbtype'};
82 include_once("lib/WikiDB/$dbtype.php");
84 $class = 'WikiDB_' . $dbtype;
85 return new $class ($dbparams);
93 function WikiDB ($backend, $dbparams) {
94 $this->_backend = &$backend;
95 $this->_cache = new WikiDB_cache($backend);
97 //FIXME: devel checking.
98 //$this->_backend->check();
102 * Get any user-level warnings about this WikiDB.
104 * Some back-ends, e.g. by default create there data files in the
105 * global /tmp directory. We would like to warn the user when this
106 * happens (since /tmp files tend to get wiped periodically.)
107 * Warnings such as these may be communicated from specific
108 * back-ends through this method.
112 * @return string A warning message (or <tt>false</tt> if there is
115 function genericWarnings() {
120 * Close database connection.
122 * The database may no longer be used after it is closed.
124 * Closing a WikiDB invalidates all <tt>WikiDB_Page</tt>s,
125 * <tt>WikiDB_PageRevision</tt>s and <tt>WikiDB_PageIterator</tt>s
126 * which have been obtained from it.
131 $this->_backend->close();
132 $this->_cache->close();
136 * Get a WikiDB_Page from a WikiDB.
138 * A WikiDB consists of the (infinite) set of all possible pages,
139 * therefore this method never fails.
142 * @param $pagename string Which page to get.
143 * @return object The requested WikiDB_Page.
145 function getPage($pagename) {
146 assert(is_string($pagename) && $pagename);
147 return new WikiDB_Page($this, $pagename);
152 //function nPages() {
157 * Determine whether page exists (in non-default form).
160 * $is_page = $dbi->isWikiPage($pagename);
164 * $page = $dbi->getPage($pagename);
165 * $current = $page->getCurrentRevision();
166 * $is_page = ! $current->hasDefaultContents();
168 * however isWikiPage may be implemented in a more efficient
169 * manner in certain back-ends.
173 * @param $pagename string Which page to check.
175 * @return boolean True if the page actually exists with
176 * non-default contents in the WikiDataBase.
178 function isWikiPage ($pagename) {
179 $page = $this->getPage($pagename);
180 $current = $page->getCurrentRevision();
181 return ! $current->hasDefaultContents();
185 * Delete page from the WikiDB.
187 * Deletes all revisions of the page from the WikiDB. Also resets
188 * all page meta-data to the default values.
192 * @param $pagename string Name of page to delete.
194 function deletePage($pagename) {
195 $this->_cache->delete_page($pagename);
196 $this->_backend->set_links($pagename, false);
200 * Retrieve all pages.
202 * Gets the set of all pages with non-default contents.
204 * FIXME: do we need this? I think so. The simple searches
209 * @param $include_defaulted boolean Normally pages whose most
210 * recent revision has empty content are considered to be
211 * non-existant. Unless $include_defaulted is set to true, those
212 * pages will not be returned.
214 * @return object A WikiDB_PageIterator which contains all pages
215 * in the WikiDB which have non-default contents.
217 function getAllPages($include_defaulted = false) {
218 $result = $this->_backend->get_all_pages($include_defaulted);
219 return new WikiDB_PageIterator($this, $result);
225 * Search for pages containing (or not containing) certain words
228 * Pages are returned in alphabetical order whenever it is
229 * practical to do so.
231 * FIXME: should titleSearch and fullSearch be combined? I think so.
234 * @param $search object A TextSearchQuery
235 * @return object A WikiDB_PageIterator containing the matching pages.
236 * @see TextSearchQuery
238 function titleSearch($search) {
239 $result = $this->_backend->text_search($search);
240 return new WikiDB_PageIterator($this, $result);
246 * Search for pages containing (or not containing) certain words
247 * in their entire text (this includes the page content and the
250 * Pages are returned in alphabetical order whenever it is
251 * practical to do so.
255 * @param $search object A TextSearchQuery object.
256 * @return object A WikiDB_PageIterator containing the matching pages.
257 * @see TextSearchQuery
259 function fullSearch($search) {
260 $result = $this->_backend->text_search($search, 'full_text');
261 return new WikiDB_PageIterator($this, $result);
265 * Find the pages with the greatest hit counts.
267 * Pages are returned in reverse order by hit count.
271 * @param $limit signed integer The maximum number of pages to return.
272 * Set $limit to zero to return all pages. If $limit < 0, pages will
273 * be sorted in decreasing order of popularity.
275 * @return object A WikiDB_PageIterator containing the matching
278 function mostPopular($limit = 20) {
279 $result = $this->_backend->most_popular($limit);
280 return new WikiDB_PageIterator($this, $result);
284 * Find recent page revisions.
286 * Revisions are returned in reverse order by creation time.
290 * @param $params hash This hash is used to specify various optional
294 * <dd> (integer) At most this many revisions will be returned.
296 * <dd> (integer) Only revisions since this time (unix-timestamp) will be returned.
297 * <dt> include_minor_revisions
298 * <dd> (boolean) Also include minor revisions. (Default is not to.)
299 * <dt> exclude_major_revisions
300 * <dd> (boolean) Don't include non-minor revisions.
301 * (Exclude_major_revisions implies include_minor_revisions.)
302 * <dt> include_all_revisions
303 * <dd> (boolean) Return all matching revisions for each page.
304 * Normally only the most recent matching revision is returned
308 * @return object A WikiDB_PageRevisionIterator containing the
309 * matching revisions.
311 function mostRecent($params = false) {
312 $result = $this->_backend->most_recent($params);
313 return new WikiDB_PageRevisionIterator($this, $result);
319 * An abstract base class which representing a wiki-page within a
322 * A WikiDB_Page contains a number (at least one) of
323 * WikiDB_PageRevisions.
327 function WikiDB_Page(&$wikidb, $pagename) {
328 $this->_wikidb = &$wikidb;
329 $this->_pagename = $pagename;
330 assert(!empty($this->_pagename));
334 * Get the name of the wiki page.
338 * @return string The page name.
341 return $this->_pagename;
346 * Delete an old revision of a WikiDB_Page.
348 * Deletes the specified revision of the page.
349 * It is a fatal error to attempt to delete the current revision.
353 * @param $version integer Which revision to delete. (You can also
354 * use a WikiDB_PageRevision object here.)
356 function deleteRevision($version) {
357 $backend = &$this->_wikidb->_backend;
358 $cache = &$this->_wikidb->_cache;
359 $pagename = &$this->_pagename;
361 $version = $this->_coerce_to_version($version);
366 $latestversion = $cache->get_latest_version($pagename);
367 if ($latestversion && $version == $latestversion) {
369 trigger_error(sprintf("Attempt to delete most recent revision of '%s'",
370 $pagename), E_USER_ERROR);
374 $cache->delete_versiondata($pagename, $version);
380 * Delete a revision, or possibly merge it with a previous
384 * Suppose an author make a (major) edit to a page. Shortly
385 * after that the same author makes a minor edit (e.g. to fix
386 * spelling mistakes he just made.)
388 * Now some time later, where cleaning out old saved revisions,
389 * and would like to delete his minor revision (since there's
390 * really no point in keeping minor revisions around for a long
393 * Note that the text after the minor revision probably represents
394 * what the author intended to write better than the text after
395 * the preceding major edit.
397 * So what we really want to do is merge the minor edit with the
400 * We will only do this when:
402 * <li>The revision being deleted is a minor one, and
403 * <li>It has the same author as the immediately preceding revision.
406 function mergeRevision($version) {
407 $backend = &$this->_wikidb->_backend;
408 $cache = &$this->_wikidb->_cache;
409 $pagename = &$this->_pagename;
411 $version = $this->_coerce_to_version($version);
416 $latestversion = $backend->get_latest_version($pagename);
417 if ($latestversion && $version == $latestversion) {
419 trigger_error(sprintf("Attempt to merge most recent revision of '%s'",
420 $pagename), E_USER_ERROR);
424 $versiondata = $cache->get_versiondata($pagename, $version, true);
426 // Not there? ... we're done!
431 if ($versiondata['is_minor_edit']) {
432 $previous = $backend->get_previous_version($pagename, $version);
434 $prevdata = $cache->get_versiondata($pagename, $previous);
435 if ($prevdata['author_id'] == $versiondata['author_id']) {
436 // This is a minor revision, previous version is
437 // by the same author. We will merge the
439 $cache->update_versiondata($pagename, $previous,
440 array('%content' => $versiondata['%content'],
441 '_supplanted' => $versiondata['_supplanted']));
446 $cache->delete_versiondata($pagename, $version);
452 * Create a new revision of a WikiDB_Page.
456 * @param $content string Contents of new revision.
458 * @param $metadata hash Metadata for new revision.
459 * All values in the hash should be scalars (strings or integers).
462 * @param $version int Version number for new revision.
463 * To ensure proper serialization of edits, $version must be
464 * exactly one higher than the current latest version.
465 * (You can defeat this check by setting $version to
466 * WIKIDB_FORCE_CREATE --- not usually recommended.)
468 * @param $links array List of pagenames which this page links to.
470 * @return object Returns the new WikiDB_PageRevision object. If
471 * $version was incorrect, returns false
473 function createRevision($version, &$content, $metadata, $links) {
474 $backend = &$this->_wikidb->_backend;
475 $cache = &$this->_wikidb->_cache;
476 $pagename = &$this->_pagename;
480 $latestversion = $backend->get_latest_version($pagename);
481 $newversion = $latestversion + 1;
482 assert($newversion >= 1);
484 if ($version != WIKIDB_FORCE_CREATE && $version != $newversion) {
491 foreach ($data as $key => $val) {
492 if (empty($val) || $key[0] == '_' || $key[0] == '%')
496 assert(!empty($data['author_id']));
497 if (empty($data['author_id']))
498 @$data['author_id'] = $data['author'];
500 if (empty($data['mtime']))
501 $data['mtime'] = time();
503 if ($latestversion) {
504 // Ensure mtimes are monotonic.
505 $pdata = $cache->get_versiondata($pagename, $latestversion);
506 if ($data['mtime'] < $pdata['mtime']) {
507 trigger_error(sprintf(_("%s: Date of new revision is %s"),
508 $pagename,"'non-monotonic'"),
510 $data['orig_mtime'] = $data['mtime'];
511 $data['mtime'] = $pdata['mtime'];
514 // FIXME: use (possibly user specified) 'mtime' time or
516 $cache->update_versiondata($pagename, $latestversion,
517 array('_supplanted' => $data['mtime']));
520 $data['%content'] = &$content;
522 $cache->set_versiondata($pagename, $newversion, $data);
524 //$cache->update_pagedata($pagename, array(':latestversion' => $newversion,
525 //':deleted' => empty($content)));
527 $backend->set_links($pagename, $links);
531 // FIXME: probably should have some global state information
532 // in the backend to control when to optimize.
533 if (time() % 50 == 0) {
534 trigger_error(sprintf(_("Optimizing %s"),'backend'), E_USER_NOTICE);
535 $backend->optimize();
538 return new WikiDB_PageRevision($this->_wikidb, $pagename, $newversion,
543 * Get the most recent revision of a page.
547 * @return object The current WikiDB_PageRevision object.
549 function getCurrentRevision() {
550 $backend = &$this->_wikidb->_backend;
551 $cache = &$this->_wikidb->_cache;
552 $pagename = &$this->_pagename;
555 $version = $cache->get_latest_version($pagename);
556 $revision = $this->getRevision($version);
563 * Get a specific revision of a WikiDB_Page.
567 * @param $version integer Which revision to get.
569 * @return object The requested WikiDB_PageRevision object, or
570 * false if the requested revision does not exist in the WikiDB.
571 * Note that version zero of any page always exists.
573 function getRevision($version) {
574 $cache = &$this->_wikidb->_cache;
575 $pagename = &$this->_pagename;
578 return new WikiDB_PageRevision($this->_wikidb, $pagename, 0);
580 assert($version > 0);
581 $vdata = $cache->get_versiondata($pagename, $version);
584 return new WikiDB_PageRevision($this->_wikidb, $pagename, $version,
589 * Get previous page revision.
591 * This method find the most recent revision before a specified
596 * @param $version integer Find most recent revision before this version.
597 * You can also use a WikiDB_PageRevision object to specify the $version.
599 * @return object The requested WikiDB_PageRevision object, or false if the
600 * requested revision does not exist in the WikiDB. Note that
601 * unless $version is greater than zero, a revision (perhaps version zero,
602 * the default revision) will always be found.
604 function getRevisionBefore($version) {
605 $backend = &$this->_wikidb->_backend;
606 $pagename = &$this->_pagename;
608 $version = $this->_coerce_to_version($version);
613 $previous = $backend->get_previous_version($pagename, $version);
614 $revision = $this->getRevision($previous);
621 * Get all revisions of the WikiDB_Page.
623 * This does not include the version zero (default) revision in the
624 * returned revision set.
626 * @return object a WikiDB_PageRevisionIterator containing all
627 * revisions of this WikiDB_Page in reverse order by version
630 function getAllRevisions() {
631 $backend = &$this->_wikidb->_backend;
632 $revs = $backend->get_all_revisions($this->_pagename);
633 return new WikiDB_PageRevisionIterator($this->_wikidb, $revs);
637 * Find pages which link to or are linked from a page.
641 * @param $reversed enum Which links to find: true for backlinks (default).
643 * @return object A WikiDB_PageIterator containing all matching pages.
645 function getLinks($reversed = true) {
646 $backend = &$this->_wikidb->_backend;
647 $result = $backend->get_links($this->_pagename, $reversed);
648 return new WikiDB_PageIterator($this->_wikidb, $result);
652 * Access WikiDB_Page meta-data.
656 * @param $key string Which meta data to get.
657 * Some reserved meta-data keys are:
659 * <dt>'locked'<dd> Is page locked?
660 * <dt>'hits' <dd> Page hit counter.
661 * <dt>'score <dd> Page score (not yet implement, do we need?)
664 * @return scalar The requested value, or false if the requested data
668 $cache = &$this->_wikidb->_cache;
669 if (!$key || $key[0] == '%')
671 $data = $cache->get_pagedata($this->_pagename);
672 return isset($data[$key]) ? $data[$key] : false;
676 * Get all the page meta-data as a hash.
678 * @return hash The page meta-data.
680 function getMetaData() {
681 $cache = &$this->_wikidb->_cache;
682 $data = $cache->get_pagedata($this->_pagename);
684 foreach ($data as $key => $val) {
685 if (!empty($val) && $key[0] != '%')
692 * Set page meta-data.
697 * @param $key string Meta-data key to set.
698 * @param $newval string New value.
700 function set($key, $newval) {
701 $cache = &$this->_wikidb->_cache;
702 $pagename = &$this->_pagename;
704 assert($key && $key[0] != '%');
706 $data = $cache->get_pagedata($pagename);
708 if (!empty($newval)) {
709 if (!empty($data[$key]) && $data[$key] == $newval)
710 return; // values identical, skip update.
713 if (empty($data[$key]))
714 return; // values identical, skip update.
717 $cache->update_pagedata($pagename, array($key => $newval));
721 * Increase page hit count.
723 * FIXME: IS this needed? Probably not.
725 * This is a convenience function.
726 * <pre> $page->increaseHitCount(); </pre>
727 * is functionally identical to
728 * <pre> $page->set('hits',$page->get('hits')+1); </pre>
730 * Note that this method may be implemented in more efficient ways
731 * in certain backends.
735 function increaseHitCount() {
736 @$newhits = $this->get('hits') + 1;
737 $this->set('hits', $newhits);
741 * Return a string representation of the WikiDB_Page
743 * This is really only for debugging.
747 * @return string Printable representation of the WikiDB_Page.
749 function asString () {
751 printf("[%s:%s\n", get_class($this), $this->getName());
752 print_r($this->getMetaData());
754 $strval = ob_get_contents();
762 * @param $version_or_pagerevision int or object
763 * Takes either the version number (and int) or a WikiDB_PageRevision
765 * @return int The version number.
767 function _coerce_to_version($version_or_pagerevision) {
768 if (method_exists($version_or_pagerevision, "getContent"))
769 $version = $version_or_pagerevision->getVersion();
771 $version = (int) $version_or_pagerevision;
773 assert($version >= 0);
779 * This class represents a specific revision of a WikiDB_Page within
782 * A WikiDB_PageRevision has read-only semantics. You may only create
783 * new revisions (and delete old ones) --- you cannot modify existing
786 class WikiDB_PageRevision
788 function WikiDB_PageRevision(&$wikidb, $pagename, $version,
789 $versiondata = false)
791 $this->_wikidb = &$wikidb;
792 $this->_pagename = $pagename;
793 $this->_version = $version;
794 $this->_data = $versiondata ? $versiondata : array();
798 * Get the WikiDB_Page which this revision belongs to.
802 * @return object The WikiDB_Page which this revision belongs to.
805 return new WikiDB_Page($this->_wikidb, $this->_pagename);
809 * Get the version number of this revision.
813 * @return int The version number of this revision.
815 function getVersion() {
816 return $this->_version;
820 * Determine whether this revision has defaulted content.
822 * The default revision (version 0) of each page, as well as any
823 * pages which are created with empty content have their content
824 * defaulted to something like:
826 * Describe [ThisPage] here.
831 * @return boolean Returns true if the page has default content.
833 function hasDefaultContents() {
834 $data = &$this->_data;
835 return empty($data['%content']);
839 * Get the content as an array of lines.
843 * @return array An array of lines.
844 * The lines should contain no trailing white space.
846 function getContent() {
847 return explode("\n", $this->getPackedContent());
851 * Determine whether revision is the latest.
855 * @return bool True iff the revision is the latest (most recent) one.
857 function isCurrent() {
858 if (!isset($this->_iscurrent)) {
859 $page = $this->getPage();
860 $current = $page->getCurrentRevision();
861 $this->_iscurrent = $this->getVersion() == $current->getVersion();
863 return $this->_iscurrent;
867 * Get the content as a string.
871 * @return string The page content.
872 * Lines are separated by new-lines.
874 function getPackedContent() {
875 $data = &$this->_data;
878 if (empty($data['%content'])) {
879 // Replace empty content with default value.
880 return sprintf(_("Describe %s here."),
881 "[". $this->_pagename ."]");
884 // There is (non-default) content.
885 assert($this->_version > 0);
887 if (!is_string($data['%content'])) {
888 // Content was not provided to us at init time.
889 // (This is allowed because for some backends, fetching
890 // the content may be expensive, and often is not wanted
893 // In any case, now we need to get it.
894 $data['%content'] = $this->_get_content();
895 assert(is_string($data['%content']));
898 return $data['%content'];
901 function _get_content() {
902 $cache = &$this->_wikidb->_cache;
903 $pagename = $this->_pagename;
904 $version = $this->_version;
906 assert($version > 0);
908 $newdata = $cache->get_versiondata($pagename, $version, true);
910 assert(is_string($newdata['%content']));
911 return $newdata['%content'];
914 // else revision has been deleted... What to do?
915 return __sprintf("Acck! Revision %s of %s seems to have been deleted!",
916 $version, $pagename);
921 * Get meta-data for this revision.
926 * @param $key string Which meta-data to access.
928 * Some reserved revision meta-data keys are:
930 * <dt> 'mtime' <dd> Time this revision was created (seconds since midnight Jan 1, 1970.)
931 * The 'mtime' meta-value is normally set automatically by the database
932 * backend, but it may be specified explicitly when creating a new revision.
934 * <dd> To ensure consistency of RecentChanges, the mtimes of the versions
935 * of a page must be monotonically increasing. If an attempt is
936 * made to create a new revision with an mtime less than that of
937 * the preceeding revision, the new revisions timestamp is force
938 * to be equal to that of the preceeding revision. In that case,
939 * the originally requested mtime is preserved in 'orig_mtime'.
940 * <dt> '_supplanted' <dd> Time this revision ceased to be the most recent.
941 * This meta-value is <em>always</em> automatically maintained by the database
942 * backend. (It is set from the 'mtime' meta-value of the superceding
943 * revision.) '_supplanted' has a value of 'false' for the current revision.
945 * FIXME: this could be refactored:
947 * <dd> Author of the page (as he should be reported in, e.g. RecentChanges.)
949 * <dd> Authenticated author of a page. This is used to identify
950 * the distinctness of authors when cleaning old revisions from
952 * <dt> 'is_minor_edit' <dd> Set if change was marked as a minor revision by the author.
953 * <dt> 'summary' <dd> Short change summary entered by page author.
956 * Meta-data keys must be valid C identifers (they have to start with a letter
957 * or underscore, and can contain only alphanumerics and underscores.)
959 * @return string The requested value, or false if the requested value
963 if (!$key || $key[0] == '%')
965 $data = &$this->_data;
966 return isset($data[$key]) ? $data[$key] : false;
970 * Get all the revision page meta-data as a hash.
972 * @return hash The revision meta-data.
974 function getMetaData() {
976 foreach ($this->_data as $key => $val) {
977 if (!empty($val) && $key[0] != '%')
985 * Return a string representation of the revision.
987 * This is really only for debugging.
991 * @return string Printable representation of the WikiDB_Page.
993 function asString () {
995 printf("[%s:%d\n", get_class($this), $this->get('version'));
996 print_r($this->_data);
997 echo $this->getPackedContent() . "\n]\n";
998 $strval = ob_get_contents();
1006 * A class which represents a sequence of WikiDB_Pages.
1008 class WikiDB_PageIterator
1010 function WikiDB_PageIterator(&$wikidb, &$pages) {
1011 $this->_pages = $pages;
1012 $this->_wikidb = &$wikidb;
1016 * Get next WikiDB_Page in sequence.
1020 * @return object The next WikiDB_Page in the sequence.
1023 if ( ! ($next = $this->_pages->next()) )
1026 $pagename = &$next['pagename'];
1027 if (isset($next['pagedata']))
1028 $this->_wikidb->_cache->cache_data($next);
1030 return new WikiDB_Page($this->_wikidb, $pagename);
1034 * Release resources held by this iterator.
1036 * The iterator may not be used after free() is called.
1038 * There is no need to call free(), if next() has returned false.
1039 * (I.e. if you iterate through all the pages in the sequence,
1040 * you do not need to call free() --- you only need to call it
1041 * if you stop before the end of the iterator is reached.)
1046 $this->_pages->free();
1051 * A class which represents a sequence of WikiDB_PageRevisions.
1053 class WikiDB_PageRevisionIterator
1055 function WikiDB_PageRevisionIterator(&$wikidb, &$revisions) {
1056 $this->_revisions = $revisions;
1057 $this->_wikidb = &$wikidb;
1061 * Get next WikiDB_PageRevision in sequence.
1065 * @return object The next WikiDB_PageRevision in the sequence.
1068 if ( ! ($next = $this->_revisions->next()) )
1071 $this->_wikidb->_cache->cache_data($next);
1073 $pagename = $next['pagename'];
1074 $version = $next['version'];
1075 $versiondata = $next['versiondata'];
1076 assert(!empty($pagename));
1077 assert(is_array($versiondata));
1078 assert($version > 0);
1080 return new WikiDB_PageRevision($this->_wikidb, $pagename, $version,
1085 * Release resources held by this iterator.
1087 * The iterator may not be used after free() is called.
1089 * There is no need to call free(), if next() has returned false.
1090 * (I.e. if you iterate through all the revisions in the sequence,
1091 * you do not need to call free() --- you only need to call it
1092 * if you stop before the end of the iterator is reached.)
1097 $this->_revisions->free();
1103 * Data cache used by WikiDB.
1105 * FIXME: Maybe rename this to caching_backend (or some such).
1111 // FIXME: beautify versiondata cache. Cache only limited data?
1113 function WikiDB_cache (&$backend) {
1114 $this->_backend = &$backend;
1116 $this->_pagedata_cache = array();
1117 $this->_versiondata_cache = array();
1118 array_push ($this->_versiondata_cache, array());
1119 $this->_glv_cache = array();
1123 $this->_pagedata_cache = false;
1124 $this->_versiondata_cache = false;
1125 $this->_glv_cache = false;
1128 function get_pagedata($pagename) {
1129 assert(is_string($pagename) && $pagename);
1130 $cache = &$this->_pagedata_cache;
1132 if (!isset($cache[$pagename]) || !is_array($cache[$pagename])) {
1133 $cache[$pagename] = $this->_backend->get_pagedata($pagename);
1134 if (empty($cache[$pagename]))
1135 $cache[$pagename] = array();
1138 return $cache[$pagename];
1141 function update_pagedata($pagename, $newdata) {
1142 assert(is_string($pagename) && $pagename);
1144 $this->_backend->update_pagedata($pagename, $newdata);
1146 if (is_array($this->_pagedata_cache[$pagename])) {
1147 $cachedata = &$this->_pagedata_cache[$pagename];
1148 foreach($newdata as $key => $val)
1149 $cachedata[$key] = $val;
1153 function invalidate_cache($pagename) {
1154 unset ($this->_pagedata_cache[$pagename]);
1155 unset ($this->_versiondata_cache[$pagename]);
1156 unset ($this->_glv_cache[$pagename]);
1159 function delete_page($pagename) {
1160 $this->_backend->delete_page($pagename);
1161 unset ($this->_pagedata_cache[$pagename]);
1162 unset ($this->_glv_cache[$pagename]);
1166 function cache_data($data) {
1167 if (isset($data['pagedata']))
1168 $this->_pagedata_cache[$data['pagename']] = $data['pagedata'];
1171 function get_versiondata($pagename, $version, $need_content = false) {
1172 // FIXME: Seriously ugly hackage
1173 if (defined ('USECACHE')){ //temporary - for debugging
1174 assert(is_string($pagename) && $pagename);
1175 // there is a bug here somewhere which results in an assertion failure at line 105
1176 // of ArchiveCleaner.php It goes away if we use the next line.
1177 $need_content = true;
1178 $nc = $need_content ? '1':'0';
1179 $cache = &$this->_versiondata_cache;
1180 if (!isset($cache[$pagename][$version][$nc])||
1181 !(is_array ($cache[$pagename])) || !(is_array ($cache[$pagename][$version]))) {
1182 $cache[$pagename][$version][$nc] =
1183 $this->_backend->get_versiondata($pagename,$version, $need_content);
1184 // If we have retrieved all data, we may as well set the cache for $need_content = false
1186 $cache[$pagename][$version]['0'] = $cache[$pagename][$version]['1'];
1189 $vdata = $cache[$pagename][$version][$nc];
1193 $vdata = $this->_backend->get_versiondata($pagename, $version, $need_content);
1196 if ($vdata && !empty($vdata['%pagedata']))
1197 $this->_pagedata_cache[$pagename] = $vdata['%pagedata'];
1201 function set_versiondata($pagename, $version, $data) {
1202 $new = $this->_backend->
1203 set_versiondata($pagename, $version, $data);
1205 $this->_versiondata_cache[$pagename][$version]['1'] = $data;
1207 $this->_versiondata_cache[$pagename][$version]['0'] = $data;
1208 // Is this necessary?
1209 unset($this->_glv_cache[$pagename]);
1213 function update_versiondata($pagename, $version, $data) {
1214 $new = $this->_backend->
1215 update_versiondata($pagename, $version, $data);
1217 $this->_versiondata_cache[$pagename][$version]['1'] = $data;
1219 $this->_versiondata_cache[$pagename][$version]['0'] = $data;
1220 // Is this necessary?
1221 unset($this->_glv_cache[$pagename]);
1225 function delete_versiondata($pagename, $version) {
1226 $new = $this->_backend->
1227 delete_versiondata($pagename, $version);
1228 unset ($this->_versiondata_cache[$pagename][$version]['1']);
1229 unset ($this->_versiondata_cache[$pagename][$version]['0']);
1230 unset ($this->_glv_cache[$pagename]);
1233 function get_latest_version($pagename) {
1234 if(defined('USECACHE')){
1235 assert (is_string($pagename) && $pagename);
1236 $cache = &$this->_glv_cache;
1237 if (!isset($cache[$pagename])) {
1238 $cache[$pagename] = $this->_backend->get_latest_version($pagename);
1239 if (empty($cache[$pagename]))
1240 $cache[$pagename] = 0;
1242 return $cache[$pagename];}
1244 return $this->_backend->get_latest_version($pagename);
1253 // c-basic-offset: 4
1254 // c-hanging-comment-ender-p: nil
1255 // indent-tabs-mode: nil