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<?php
namespace IMSGlobal\LTI\ToolProvider;
/**
* Class to represent a content-item object
*
* @author Stephen P Vickers <svickers@imsglobal.org>
* @copyright IMS Global Learning Consortium Inc
* @date 2016
* @version 3.0.2
* @license http://www.apache.org/licenses/LICENSE-2.0 Apache License, Version 2.0
*/
class ContentItem
{
/**
* Media type for LTI launch links.
*/
const LTI_LINK_MEDIA_TYPE = 'application/vnd.ims.lti.v1.ltilink';
/**
* Class constructor.
*
* @param string $type Class type of content-item
* @param ContentItemPlacement $placementAdvice Placement object for item (optional)
* @param string $id URL of content-item (optional)
*/
function __construct($type, $placementAdvice = null, $id = null)
{
$this->{'@type'} = $type;
if (is_object($placementAdvice) && (count(get_object_vars($placementAdvice)) > 0)) {
$this->placementAdvice = $placementAdvice;
}
if (!empty($id)) {
$this->{'@id'} = $id;
}
}
/**
* Set a URL value for the content-item.
*
* @param string $url URL value
*/
public function setUrl($url)
{
if (!empty($url)) {
$this->url = $url;
} else {
unset($this->url);
}
}
/**
* Set a media type value for the content-item.
*
* @param string $mediaType Media type value
*/
public function setMediaType($mediaType)
{
if (!empty($mediaType)) {
$this->mediaType = $mediaType;
} else {
unset($this->mediaType);
}
}
/**
* Set a title value for the content-item.
*
* @param string $title Title value
*/
public function setTitle($title)
{
if (!empty($title)) {
$this->title = $title;
} else if (isset($this->title)) {
unset($this->title);
}
}
/**
* Set a link text value for the content-item.
*
* @param string $text Link text value
*/
public function setText($text)
{
if (!empty($text)) {
$this->text = $text;
} else if (isset($this->text)) {
unset($this->text);
}
}
/**
* Wrap the content items to form a complete application/vnd.ims.lti.v1.contentitems+json media type instance.
*
* @param mixed $items An array of content items or a single item
* @return string
*/
public static function toJson($items)
{
/*
$data = array();
if (!is_array($items)) {
$data[] = json_encode($items);
} else {
foreach ($items as $item) {
$data[] = json_encode($item);
}
}
$json = '{ "@context" : "http://purl.imsglobal.org/ctx/lti/v1/ContentItem", "@graph" : [' . implode(", ", $data) . '] }';
*/
$obj = new \stdClass();
$obj->{'@context'} = 'http://purl.imsglobal.org/ctx/lti/v1/ContentItem';
if (!is_array($items)) {
$obj->{'@graph'} = array();
$obj->{'@graph'}[] = $items;
} else {
$obj->{'@graph'} = $items;
}
return json_encode($obj);
}
}