class.ilAssQuestionSkillAssignmentRegistry.php

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<?php
/* Copyright (c) 1998-2013 ILIAS open source, Extended GPL, see docs/LICENSE */

require_once 'Services/Utilities/classes/class.ilStr.php';

class ilAssQuestionSkillAssignmentRegistry
{
        const DEFAULT_CHUNK_SIZE = 1000;

        protected $settings;

        protected $chunkSize = self::DEFAULT_CHUNK_SIZE;

        public function __construct(\ilSetting $setting)
        {
                $this->settings = $setting;
        }

        public function getChunkSize()
        {
                return $this->chunkSize;
        }

        public function setChunkSize($chunkSize)
        {
                if(!is_numeric($chunkSize) || $chunkSize <= 0)
                {
                        throw new \InvalidArgumentException(sprintf("The passed chunk size is not a valid/supported integer: %s", var_export($chunkSize, true)));
                }

                $this->chunkSize = $chunkSize;
        }

        protected function getNumberOfChunksByKey($key)
        {
                return (int)$this->settings->get($key . '_num', 0);
        }

        public function getStringifiedImports($key, $default = null)
        {
                $value = '';

                for($i = 1, $numberOfChunks = $this->getNumberOfChunksByKey($key); $i <= $numberOfChunks; $i++)
                {
                        $value .= $this->settings->get($key . '_' . $i);
                }

                return \ilStr::strLen($value) > 0 ? $value : $default;
        }

        public function setStringifiedImports($key, $value)
        {
                $i = 0;

                while(\ilStr::strLen($value) > 0)
                {
                        ++$i;

                        $valueToStore = \ilStr::subStr($value, 0, $this->getChunkSize());
                        $this->settings->set($key . '_' . $i, $valueToStore);

                        $truncatedValue = \ilStr::subStr($value, $this->getChunkSize(), \ilStr::strLen($value) - $this->getChunkSize());

                        $value = $truncatedValue;
                }

                if($i > 0)
                {
                        $this->settings->set($key . '_num', $i);
                }
        }

        public function deleteStringifiedImports($key)
        {
                for($i = 1, $numberOfChunks = $this->getNumberOfChunksByKey($key); $i <= $numberOfChunks; $i++)
                {
                        $this->settings->delete($key . '_' . $i);
                }

                $this->settings->delete($key . '_num');
        }
}