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<?php
namespace Sabre\VObject;
use Sabre\Xml;
/**
* A node is the root class for every element in an iCalendar of vCard object.
*
* @copyright Copyright (C) fruux GmbH (https://fruux.com/)
* @author Evert Pot (http://evertpot.com/)
* @license http://sabre.io/license/ Modified BSD License
*/
abstract class Node implements \IteratorAggregate, \ArrayAccess, \Countable, \JsonSerializable, Xml\XmlSerializable
{
/**
* The following constants are used by the validate() method.
*
* If REPAIR is set, the validator will attempt to repair any broken data
* (if possible).
*/
const REPAIR = 1;
/**
* If this option is set, the validator will operate on the vcards on the
* assumption that the vcards need to be valid for CardDAV.
*
* This means for example that the UID is required, whereas it is not for
* regular vcards.
*/
const PROFILE_CARDDAV = 2;
/**
* If this option is set, the validator will operate on iCalendar objects
* on the assumption that the vcards need to be valid for CalDAV.
*
* This means for example that calendars can only contain objects with
* identical component types and UIDs.
*/
const PROFILE_CALDAV = 4;
/**
* Reference to the parent object, if this is not the top object.
*
* @var Node
*/
public $parent;
/**
* Iterator override.
*
* @var ElementList
*/
protected $iterator = null;
/**
* The root document.
*
* @var Component
*/
protected $root;
/**
* Serializes the node into a mimedir format.
*
* @return string
*/
abstract public function serialize();
/**
* This method returns an array, with the representation as it should be
* encoded in JSON. This is used to create jCard or jCal documents.
*
* @return array
*/
abstract public function jsonSerialize();
/**
* This method serializes the data into XML. This is used to create xCard or
* xCal documents.
*
* @param Xml\Writer $writer XML writer
*/
abstract public function xmlSerialize(Xml\Writer $writer);
/**
* Call this method on a document if you're done using it.
*
* It's intended to remove all circular references, so PHP can easily clean
* it up.
*/
public function destroy()
{
$this->parent = null;
$this->root = null;
}
/* {{{ IteratorAggregator interface */
/**
* Returns the iterator for this object.
*
* @return ElementList
*/
public function getIterator()
{
if (!is_null($this->iterator)) {
return $this->iterator;
}
return new ElementList([$this]);
}
/**
* Sets the overridden iterator.
*
* Note that this is not actually part of the iterator interface
*/
public function setIterator(ElementList $iterator)
{
$this->iterator = $iterator;
}
/**
* Validates the node for correctness.
*
* The following options are supported:
* Node::REPAIR - May attempt to automatically repair the problem.
*
* This method returns an array with detected problems.
* Every element has the following properties:
*
* * level - problem level.
* * message - A human-readable string describing the issue.
* * node - A reference to the problematic node.
*
* The level means:
* 1 - The issue was repaired (only happens if REPAIR was turned on)
* 2 - An inconsequential issue
* 3 - A severe issue.
*
* @param int $options
*
* @return array
*/
public function validate($options = 0)
{
return [];
}
/* }}} */
/* {{{ Countable interface */
/**
* Returns the number of elements.
*
* @return int
*/
public function count()
{
$it = $this->getIterator();
return $it->count();
}
/* }}} */
/* {{{ ArrayAccess Interface */
/**
* Checks if an item exists through ArrayAccess.
*
* This method just forwards the request to the inner iterator
*
* @param int $offset
*
* @return bool
*/
public function offsetExists($offset)
{
$iterator = $this->getIterator();
return $iterator->offsetExists($offset);
}
/**
* Gets an item through ArrayAccess.
*
* This method just forwards the request to the inner iterator
*
* @param int $offset
*
* @return mixed
*/
public function offsetGet($offset)
{
$iterator = $this->getIterator();
return $iterator->offsetGet($offset);
}
/**
* Sets an item through ArrayAccess.
*
* This method just forwards the request to the inner iterator
*
* @param int $offset
* @param mixed $value
*/
public function offsetSet($offset, $value)
{
$iterator = $this->getIterator();
$iterator->offsetSet($offset, $value);
// @codeCoverageIgnoreStart
//
// This method always throws an exception, so we ignore the closing
// brace
}
// @codeCoverageIgnoreEnd
/**
* Sets an item through ArrayAccess.
*
* This method just forwards the request to the inner iterator
*
* @param int $offset
*/
public function offsetUnset($offset)
{
$iterator = $this->getIterator();
$iterator->offsetUnset($offset);
// @codeCoverageIgnoreStart
//
// This method always throws an exception, so we ignore the closing
// brace
}
// @codeCoverageIgnoreEnd
/* }}} */
}
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