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MDL-27819 Backup - mod_lesson conversion: optimized page buffering from all pages to 3 pages

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Aparup Banerjee 2011-06-15 15:41:38 +08:00 committed by Eloy Lafuente (stronk7)
parent 496a576aa9
commit 6df63e4f9b
1 changed files with 82 additions and 55 deletions
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137
mod/lesson/backup/moodle1/lib.php
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@ -37,6 +37,8 @@ class moodle1_mod_lesson_handler extends moodle1_mod_handler {
protected $page;
// @var array of page objects to store entire pages, to help generate nextpageid and prevpageid in data
protected $pages;
// @var int a page id (previous)
protected $prevpageid = 0;
/** @var moodle1_file_manager */
protected $fileman = null;
@ -128,9 +130,10 @@ class moodle1_mod_lesson_handler extends moodle1_mod_handler {
'modulename' => 'lesson', 'contextid' => $contextid));
$this->xmlwriter->begin_tag('lesson', array('id' => $instanceid));
unset($data['id']);
foreach ($data as $field => $value) {
$this->xmlwriter->full_tag($field, $value);
if ($field <> 'id') {
$this->xmlwriter->full_tag($field, $value);
}
}
return $data;
@ -184,66 +187,46 @@ class moodle1_mod_lesson_handler extends moodle1_mod_handler {
public function on_lesson_page_end() {
$this->page->answers = $this->answers;
unset($this->answers);
$this->pages[] = $this->page;
unset($this->page);
$firstbatch = count($this->pages) > 2;
$nextbatch = count($this->pages) > 1 && $this->prevpageid != 0;
if ( $firstbatch || $nextbatch ) { //we can write out 1 page atleast
if ($this->prevpageid == 0) {
// start writing with n-2 page (relative to this on_lesson_page_end() call)
$pg1 = $this->pages[1];
$pg0 = $this->pages[0];
$this->write_single_page_xml($pg0, 0, $pg1->id);
$this->prevpageid = $pg0->id;
array_shift($this->pages); //bye bye page0
}
$pg1 = $this->pages[0];
// write pg1 referencing prevpageid and pg2
$pg2 = $this->pages[1];
$this->write_single_page_xml($pg1, $this->prevpageid, $pg2->id);
$this->prevpageid = $pg1->id;
array_shift($this->pages); //throw written n-1th page
}
}
public function on_lesson_pages_end() {
$prevpageid = 0;
foreach ($this->pages as $page) {
$curpageid = $page->id;
// if there are more pages, set nextpageid
if (isset($this->pages[1])) {
$nextpage = $this->pages[1];
$nextpageid = $nextpage->id;
} else {
//theres only one page left
$nextpageid = 0;
if ($this->pages) {
if (isset($this->pages[1])) { // write the case of only 2 pages.
$this->write_single_page_xml($this->pages[0], $this->prevpageid, $this->pages[1]->id);
$this->prevpageid = $this->pages[0]->id;
array_shift($this->pages);
}
//mince nextpageid and prevpageid
$page->data['nextpageid'] = $nextpageid;
$page->data['prevpageid'] = $prevpageid;
array_shift($this->pages);
// write out each page data
$this->xmlwriter->begin_tag('page', array('id' => $page->id));
foreach ($page->data as $field => $value) {
$this->xmlwriter->full_tag($field, $value);
}
//effectively on_lesson_answers_end(), where we write out answers for current page.
$answers = $page->answers;
$this->xmlwriter->begin_tag('answers');
if (count($answers) > 3) {
if ($answers[0]['jumpto'] !== '0' || $answers[1]['jumpto'] !== '0') {
if ($answers[2]['jumpto'] !== '0') {
$answers[0]['jumpto'] = $answers[2]['jumpto'];
$answers[2]['jumpto'] = '0';
}
if ($answers[3]['jumpto'] !== '0') {
$answers[1]['jumpto'] = $answers[3]['jumpto'];
$answers[3]['jumpto'] = '0';
}
}
}
foreach ($answers as $data) {
$this->write_xml('answer', $data, array('/answer/id'));
}
$this->xmlwriter->end_tag('answers');
// answers is now closed for current page. Ending the page.
$this->xmlwriter->end_tag('page');
// set prevpageid
$prevpageid = $curpageid;
//write the remaining (first/last) single page
$this->write_single_page_xml($this->pages[0], $this->prevpageid, 0);
}
$this->xmlwriter->end_tag('pages');
//reset
unset($this->pages);
$this->prevpageid = 0;
unset($this->answers);
unset($this->page);
}
/**
@ -266,4 +249,48 @@ class moodle1_mod_lesson_handler extends moodle1_mod_handler {
$this->xmlwriter->end_tag('inforef');
$this->close_xml_writer();
}
/**
* writes out the given page into the open xml handle
* @param type $page
* @param type $prevpageid
* @param type $nextpageid
*/
protected function write_single_page_xml($page, $prevpageid=0, $nextpageid=0) {
//mince nextpageid and prevpageid
$page->data['nextpageid'] = $nextpageid;
$page->data['prevpageid'] = $prevpageid;
// write out each page data
$this->xmlwriter->begin_tag('page', array('id' => $page->id));
foreach ($page->data as $field => $value) {
$this->xmlwriter->full_tag($field, $value);
}
//effectively on_lesson_answers_end(), where we write out answers for current page.
$answers = $page->answers;
$this->xmlwriter->begin_tag('answers');
if (count($answers) > 3) {
if ($answers[0]['jumpto'] !== '0' || $answers[1]['jumpto'] !== '0') {
if ($answers[2]['jumpto'] !== '0') {
$answers[0]['jumpto'] = $answers[2]['jumpto'];
$answers[2]['jumpto'] = '0';
}
if ($answers[3]['jumpto'] !== '0') {
$answers[1]['jumpto'] = $answers[3]['jumpto'];
$answers[3]['jumpto'] = '0';
}
}
}
foreach ($answers as $data) {
$this->write_xml('answer', $data, array('/answer/id'));
}
$this->xmlwriter->end_tag('answers');
// answers is now closed for current page. Ending the page.
$this->xmlwriter->end_tag('page');
}
}