167 lines
3.3 KiB
PHP
167 lines
3.3 KiB
PHP
<?php
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namespace Sabre\VObject;
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/**
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* Base class for all nodes
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*
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* @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
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* @author Evert Pot (http://www.rooftopsolutions.nl/)
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* @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
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*/
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abstract class Node implements \IteratorAggregate, \ArrayAccess, \Countable {
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/**
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* Turns the object back into a serialized blob.
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*
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* @return string
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*/
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abstract function serialize();
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/**
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* Iterator override
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*
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* @var ElementList
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*/
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protected $iterator = null;
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/**
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* A link to the parent node
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*
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* @var Node
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*/
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public $parent = null;
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/**
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* Validates the node for correctness.
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* An array is returned with warnings.
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*
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* Every item in the array has the following properties:
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* * level - (number between 1 and 3 with severity information)
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* * message - (human readable message)
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* * node - (reference to the offending node)
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*
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* @return array
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*/
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public function validate() {
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return array();
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}
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/* {{{ IteratorAggregator interface */
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/**
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* Returns the iterator for this object
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*
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* @return ElementList
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*/
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public function getIterator() {
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if (!is_null($this->iterator))
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return $this->iterator;
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return new ElementList(array($this));
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}
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/**
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* Sets the overridden iterator
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*
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* Note that this is not actually part of the iterator interface
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*
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* @param ElementList $iterator
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* @return void
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*/
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public function setIterator(ElementList $iterator) {
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$this->iterator = $iterator;
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}
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/* }}} */
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/* {{{ Countable interface */
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/**
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* Returns the number of elements
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*
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* @return int
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*/
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public function count() {
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$it = $this->getIterator();
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return $it->count();
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}
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/* }}} */
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/* {{{ ArrayAccess Interface */
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/**
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* Checks if an item exists through ArrayAccess.
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*
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* This method just forwards the request to the inner iterator
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*
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* @param int $offset
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* @return bool
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*/
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public function offsetExists($offset) {
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$iterator = $this->getIterator();
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return $iterator->offsetExists($offset);
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}
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/**
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* Gets an item through ArrayAccess.
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*
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* This method just forwards the request to the inner iterator
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*
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* @param int $offset
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* @return mixed
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*/
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public function offsetGet($offset) {
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$iterator = $this->getIterator();
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return $iterator->offsetGet($offset);
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}
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/**
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* Sets an item through ArrayAccess.
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*
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* This method just forwards the request to the inner iterator
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*
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* @param int $offset
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* @param mixed $value
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* @return void
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*/
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public function offsetSet($offset,$value) {
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$iterator = $this->getIterator();
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$iterator->offsetSet($offset,$value);
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}
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/**
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* Sets an item through ArrayAccess.
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*
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* This method just forwards the request to the inner iterator
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*
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* @param int $offset
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* @return void
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*/
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public function offsetUnset($offset) {
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$iterator = $this->getIterator();
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$iterator->offsetUnset($offset);
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}
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/* }}} */
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}
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