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<?php
/**
* @package Joomla.Platform
* @subpackage Registry
*
* @copyright Copyright (C) 2005 - 2014 Open Source Matters, Inc. All rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE
*/
defined('JPATH_PLATFORM') or die;
jimport('joomla.utilities.arrayhelper');
/**
* JRegistry class
*
* @package Joomla.Platform
* @subpackage Registry
* @since 11.1
*/
class JRegistry implements JsonSerializable
{
/**
* Registry Object
*
* @var object
* @since 11.1
*/
protected $data;
/**
* @var array JRegistry instances container.
* @since 11.3
*/
protected static $instances = array();
/**
* Constructor
*
* @param mixed $data The data to bind to the new JRegistry object.
*
* @since 11.1
*/
public function __construct($data = null)
{
// Instantiate the internal data object.
$this->data = new stdClass;
// Optionally load supplied data.
if (is_array($data) || is_object($data))
{
$this->bindData($this->data, $data);
}
elseif (!empty($data) && is_string($data))
{
$this->loadString($data);
}
}
/**
* Magic function to clone the registry object.
*
* @return JRegistry
*
* @since 11.1
*/
public function __clone()
{
$this->data = unserialize(serialize($this->data));
}
/**
* Magic function to render this object as a string using default args of toString method.
*
* @return string
*
* @since 11.1
*/
public function __toString()
{
return $this->toString();
}
/**
* Implementation for the JsonSerializable interface.
* Allows us to pass JRegistry objects to json_encode.
*
* @return object
*
* @since 12.2
* @note The interface is only present in PHP 5.4 and up.
*/
public function jsonSerialize()
{
return $this->data;
}
/**
* Sets a default value if not already assigned.
*
* @param string $key The name of the parameter.
* @param mixed $default An optional value for the parameter.
*
* @return mixed The value set, or the default if the value was not previously set (or null).
*
* @since 11.1
*/
public function def($key, $default = '')
{
$value = $this->get($key, $default);
$this->set($key, $value);
return $value;
}
/**
* Check if a registry path exists.
*
* @param string $path Registry path (e.g. joomla.content.showauthor)
*
* @return boolean
*
* @since 11.1
*/
public function exists($path)
{
// Explode the registry path into an array
if ($nodes = explode('.', $path))
{
// Initialize the current node to be the registry root.
$node = $this->data;
// Traverse the registry to find the correct node for the result.
for ($i = 0, $n = count($nodes); $i < $n; $i++)
{
if (isset($node->$nodes[$i]))
{
$node = $node->$nodes[$i];
}
else
{
break;
}
if ($i + 1 == $n)
{
return true;
}
}
}
return false;
}
/**
* Get a registry value.
*
* @param string $path Registry path (e.g. joomla.content.showauthor)
* @param mixed $default Optional default value, returned if the internal value is null.
*
* @return mixed Value of entry or null
*
* @since 11.1
*/
public function get($path, $default = null)
{
$result = $default;
if (!strpos($path, '.'))
{
return (isset($this->data->$path) && $this->data->$path !== null && $this->data->$path !== '') ? $this->data->$path : $default;
}
// Explode the registry path into an array
$nodes = explode('.', $path);
// Initialize the current node to be the registry root.
$node = $this->data;
$found = false;
// Traverse the registry to find the correct node for the result.
foreach ($nodes as $n)
{
if (isset($node->$n))
{
$node = $node->$n;
$found = true;
}
else
{
$found = false;
break;
}
}
if ($found && $node !== null && $node !== '')
{
$result = $node;
}
return $result;
}
/**
* Returns a reference to a global JRegistry object, only creating it
* if it doesn't already exist.
*
* This method must be invoked as:
* <pre>$registry = JRegistry::getInstance($id);</pre>
*
* @param string $id An ID for the registry instance
*
* @return JRegistry The JRegistry object.
*
* @since 11.1
*/
public static function getInstance($id)
{
if (empty(self::$instances[$id]))
{
self::$instances[$id] = new JRegistry;
}
return self::$instances[$id];
}
/**
* Load a associative array of values into the default namespace
*
* @param array $array Associative array of value to load
*
* @return boolean True on success
*
* @since 11.1
*/
public function loadArray($array)
{
$this->bindData($this->data, $array);
return true;
}
/**
* Load the public variables of the object into the default namespace.
*
* @param object $object The object holding the publics to load
*
* @return boolean True on success
*
* @since 11.1
*/
public function loadObject($object)
{
$this->bindData($this->data, $object);
return true;
}
/**
* Load the contents of a file into the registry
*
* @param string $file Path to file to load
* @param string $format Format of the file [optional: defaults to JSON]
* @param array $options Options used by the formatter
*
* @return boolean True on success
*
* @since 11.1
*/
public function loadFile($file, $format = 'JSON', $options = array())
{
$data = file_get_contents($file);
return $this->loadString($data, $format, $options);
}
/**
* Load a string into the registry
*
* @param string $data String to load into the registry
* @param string $format Format of the string
* @param array $options Options used by the formatter
*
* @return boolean True on success
*
* @since 11.1
*/
public function loadString($data, $format = 'JSON', $options = array())
{
// Load a string into the given namespace [or default namespace if not given]
$handler = JRegistryFormat::getInstance($format);
$obj = $handler->stringToObject($data, $options);
$this->loadObject($obj);
return true;
}
/**
* Merge a JRegistry object into this one
*
* @param JRegistry $source Source JRegistry object to merge.
*
* @return boolean True on success
*
* @since 11.1
*/
public function merge($source)
{
if (!$source instanceof JRegistry)
{
return false;
}
// Load the variables into the registry's default namespace.
foreach ($source->toArray() as $k => $v)
{
if (($v !== null) && ($v !== ''))
{
$this->data->$k = $v;
}
}
return true;
}
/**
* Set a registry value.
*
* @param string $path Registry Path (e.g. joomla.content.showauthor)
* @param mixed $value Value of entry
*
* @return mixed The value of the that has been set.
*
* @since 11.1
*/
public function set($path, $value)
{
$result = null;
/**
* Explode the registry path into an array and remove empty
* nodes caused by passing in double dotted strings. ex: joomla..test.
* Finally, re-key the array so it is sequential.
*/
$nodes = array_values(array_filter(explode('.', $path), 'strlen'));
if ($nodes)
{
// Initialize the current node to be the registry root.
$node = $this->data;
// Traverse the registry to find the correct node for the result.
for ($i = 0, $n = count($nodes) - 1; $i < $n; $i++)
{
if (!isset($node->$nodes[$i]) && ($i != $n))
{
$node->$nodes[$i] = new stdClass;
}
$node = (object) $node->$nodes[$i];
}
// Get the old value if exists so we can return it
$result = $node->$nodes[$i] = $value;
}
return $result;
}
/**
* Transforms a namespace to an array
*
* @return array An associative array holding the namespace data
*
* @since 11.1
*/
public function toArray()
{
return (array) $this->asArray($this->data);
}
/**
* Transforms a namespace to an object
*
* @return object An an object holding the namespace data
*
* @since 11.1
*/
public function toObject()
{
return $this->data;
}
/**
* Get a namespace in a given string format
*
* @param string $format Format to return the string in
* @param mixed $options Parameters used by the formatter, see formatters for more info
*
* @return string Namespace in string format
*
* @since 11.1
*/
public function toString($format = 'JSON', $options = array())
{
// Return a namespace in a given format
$handler = JRegistryFormat::getInstance($format);
return $handler->objectToString($this->data, $options);
}
/**
* Method to recursively bind data to a parent object.
*
* @param object $parent The parent object on which to attach the data values.
* @param mixed $data An array or object of data to bind to the parent object.
*
* @return void
*
* @since 11.1
*/
protected function bindData($parent, $data)
{
// Ensure the input data is an array.
if (is_object($data))
{
$data = get_object_vars($data);
}
else
{
$data = (array) $data;
}
foreach ($data as $k => $v)
{
if ((is_array($v) && JArrayHelper::isAssociative($v)) || is_object($v))
{
$parent->$k = new stdClass;
$this->bindData($parent->$k, $v);
}
else
{
$parent->$k = $v;
}
}
}
/**
* Method to recursively convert an object of data to an array.
*
* @param object $data An object of data to return as an array.
*
* @return array Array representation of the input object.
*
* @since 11.1
*/
protected function asArray($data)
{
$array = array();
foreach (get_object_vars((object) $data) as $k => $v)
{
if (is_object($v))
{
$array[$k] = $this->asArray($v);
}
else
{
$array[$k] = $v;
}
}
return $array;
}
}