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<?php
/**
* @package FOF
* @copyright 2010-2017 Nicholas K. Dionysopoulos / Akeeba Ltd
* @license GNU GPL version 2 or later
*/
namespace FOF30\Hal;
defined('_JEXEC') or die;
/**
* Implementation of the Hypertext Application Language links in PHP. This is
* actually a collection of links.
*
* @see http://stateless.co/hal_specification.html
*/
class Links
{
/**
* The collection of links, sorted by relation
*
* @var array
*/
private $_links = array();
/**
* Add a single link to the links collection
*
* @param string $rel The relation of the link to the document. See RFC 5988
* http://tools.ietf.org/html/rfc5988#section-6.2.2 A document
* MUST always have a "self" link.
* @param Link $link The actual link object
* @param boolean $overwrite When false and a link of $rel relation exists, an array of
* links is created. Otherwise the existing link is overwriten
* with the new one
*
* @return boolean True if the link was added to the collection
*/
public function addLink($rel, Link $link, $overwrite = true)
{
if (!$link->check())
{
return false;
}
if (!array_key_exists($rel, $this->_links) || $overwrite)
{
$this->_links[$rel] = $link;
}
else
{
if (!is_array($this->_links[$rel]))
{
$this->_links[$rel] = array($this->_links[$rel]);
}
$this->_links[$rel][] = $link;
}
}
/**
* Add multiple links to the links collection
*
* @param string $rel The relation of the links to the document. See RFC 5988.
* @param array $links An array of FOFHalLink objects
* @param boolean $overwrite When false and a link of $rel relation exists, an array
* of links is created. Otherwise the existing link is
* overwriten with the new one
*
* @return boolean True if the link was added to the collection
*/
public function addLinks($rel, array $links, $overwrite = true)
{
if (empty($links))
{
return false;
}
$localOverwrite = $overwrite;
foreach ($links as $link)
{
if ($link instanceof Link)
{
$this->addLink($rel, $link, $localOverwrite);
}
// After the first time we call this with overwrite on we have to
// turn it off so that the other links are added to the set instead
// of overwriting the first item that's already added.
if ($localOverwrite)
{
$localOverwrite = false;
}
}
}
/**
* Returns the collection of links
*
* @param string $rel Optional; the relation to return the links for
*
* @return array|Link
*/
public function getLinks($rel = null)
{
if (empty($rel))
{
return $this->_links;
}
elseif (isset($this->_links[$rel]))
{
return $this->_links[$rel];
}
else
{
return array();
}
}
}
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