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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle 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 3 of the License, or
// (at your option) any later version.
//
// Moodle 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 Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* Test iterator that skips future documents
*
* @package core_search
* @category test
* @copyright 2017 The Open University
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
namespace core_search;
defined('MOODLE_INTERNAL') || die();
/**
* Test iterator that skips future documents
*
* @package core_search
* @category test
* @copyright 2017 The Open University
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class skip_future_documents_iterator_testcase extends \basic_testcase {
/**
* Test normal case with all documents in the past.
*/
public function test_iterator_all_in_past() {
$past = strtotime('2017-11-01');
$documents = [
self::make_doc($past, 1),
self::make_doc($past + 1, 2),
self::make_doc($past + 2, 3)
];
$this->assertEquals('mod_x-frog-1.mod_x-frog-2.mod_x-frog-3.',
self::do_iterator($documents));
}
/**
* Confirm that the iterator does not call its parent iterator current() function too many
* times.
*/
public function test_iterator_performance() {
$counter = new test_counting_iterator();
$iterator = new skip_future_documents_iterator($counter);
$items = 0;
foreach ($iterator as $value) {
$this->assertEquals(false, $value);
$items++;
}
$this->assertEquals(3, $items);
$this->assertEquals(3, $counter->get_count());
}
/**
* Test with no documents at all.
*/
public function test_iterator_empty() {
$this->assertEquals('', self::do_iterator([]));
}
/**
* Test if some documents are in the future.
*/
public function test_iterator_some_in_future() {
$past = strtotime('2017-11-01');
$future = time() + 1000;
$documents = [
self::make_doc($past, 1),
self::make_doc($past + 1, 2),
self::make_doc($future, 3)
];
$this->assertEquals('mod_x-frog-1.mod_x-frog-2.',
self::do_iterator($documents));
}
/**
* Test if all documents are in the future.
*/
public function test_iterator_all_in_future() {
$future = time() + 1000;
$documents = [
self::make_doc($future, 1),
self::make_doc($future + 1, 2),
self::make_doc($future + 2, 3)
];
$this->assertEquals('', self::do_iterator($documents));
}
/**
* Test when some documents return error.
*/
public function test_iterator_some_false() {
$past = strtotime('2017-11-01');
$documents = [
self::make_doc($past, 1),
false,
self::make_doc($past + 2, 3)
];
$this->assertEquals('mod_x-frog-1.false.mod_x-frog-3.',
self::do_iterator($documents));
}
/**
* Test when all documents return error.
*/
public function test_iterator_all_false() {
$documents = [
false,
false,
false
];
$this->assertEquals('false.false.false.',
self::do_iterator($documents));
}
/**
* Test iterator with all cases.
*/
public function test_iterator_past_false_and_future() {
$past = strtotime('2017-11-01');
$future = time() + 1000;
$documents = [
false,
self::make_doc($past, 1),
false,
self::make_doc($past + 1, 2),
false,
self::make_doc($future, 3),
false
];
$this->assertEquals('false.mod_x-frog-1.false.mod_x-frog-2.false.',
self::do_iterator($documents));
}
/**
* Helper function to create a search document.
*
* @param int $time Modified time
* @param int $index Item id
* @return document Search document
*/
protected static function make_doc($time, $index) {
$doc = new document($index, 'mod_x', 'frog');
$doc->set('modified', $time);
return $doc;
}
/**
* Puts documents through the iterator and returns result as a string for easy testing.
*
* @param document[] $documents Array of documents
* @return string Documents converted to string
*/
protected static function do_iterator(array $documents) {
$parent = new \ArrayIterator($documents);
$iterator = new skip_future_documents_iterator($parent);
$result = '';
foreach ($iterator as $rec) {
if (!$rec) {
$result .= 'false.';
} else {
$result .= $rec->get('id') . '.';
}
}
return $result;
}
}
/**
* Fake iterator just for counting how many times current() is called. It returns 'false' 3 times.
*
* @package core_search
* @category test
* @copyright 2017 The Open University
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class test_counting_iterator implements \Iterator {
/** @var int Current position in iterator */
protected $pos = 0;
/** @var int Number of calls to current() function */
protected $count = 0;
/**
* Returns the current element.
*
* @return mixed Can return any type.
*/
public function current() {
$this->count++;
return false;
}
/**
* Counts iterator usage.
*
* @return int Number of times current() was called
*/
public function get_count() {
return $this->count;
}
/**
* Goes on to the next element.
*/
public function next() {
$this->pos++;
}
/**
* Gets the key (not supported)
*
* @throws \coding_exception Always
*/
public function key() {
throw new \coding_exception('Unsupported');
}
/**
* Checks if iterato is valid (still has entries).
*
* @return bool True if still valid
*/
public function valid() {
return $this->pos < 3;
}
/**
* Rewinds the iterator.
*/
public function rewind() {
$this->pos = 0;
}
}