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<?php
/**
* Zend Framework
*
* LICENSE
*
* This source file is subject to the new BSD license that is bundled
* with this package in the file LICENSE.txt.
* It is also available through the world-wide-web at this URL:
* http://framework.zend.com/license/new-bsd
* If you did not receive a copy of the license and are unable to
* obtain it through the world-wide-web, please send an email
* to license@zend.com so we can send you a copy immediately.
*
* @category Zend
* @package Zend_Feed
* @copyright Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
* @version $Id: Element.php 8064 2008-02-16 10:58:39Z thomas $
*/
/**
* Wraps a DOMElement allowing for SimpleXML-like access to attributes.
*
* @category Zend
* @package Zend_Feed
* @copyright Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
class Zend_Feed_Element implements ArrayAccess {
/**
* @var DOMElement
*/
protected $_element;
/**
* @var Zend_Feed_Element
*/
protected $_parentElement;
/**
* @var boolean
*/
protected $_appended = true;
/**
* Zend_Feed_Element constructor.
*
* @param DOMElement $element The DOM element we're encapsulating.
* @return void
*/
public function __construct($element = null) {
$this->_element = $element;
}
/**
* Get a DOM representation of the element
*
* Returns the underlying DOM object, which can then be
* manipulated with full DOM methods.
*
* @return DOMDocument
*/
public function getDOM() {
return $this->_element;
}
/**
* Update the object from a DOM element
*
* Take a DOMElement object, which may be originally from a call
* to getDOM() or may be custom created, and use it as the
* DOM tree for this Zend_Feed_Element.
*
* @param DOMElement $element
* @return void
*/
public function setDOM(DOMElement $element) {
$this->_element = $this->_element->ownerDocument->importNode($element, true);
}
/**
* Set the parent element of this object to another
* Zend_Feed_Element.
*
* @param Zend_Feed_Element $element
* @return void
*/
public function setParent(Zend_Feed_Element $element) {
$this->_parentElement = $element;
$this->_appended = false;
}
/**
* Appends this element to its parent if necessary.
*
* @return void
*/
protected function ensureAppended() {
if (! $this->_appended) {
$this->_parentElement->getDOM()->appendChild($this->_element);
$this->_appended = true;
$this->_parentElement->ensureAppended();
}
}
/**
* Get an XML string representation of this element
*
* Returns a string of this element's XML, including the XML
* prologue.
*
* @return string
*/
public function saveXml() {
// Return a complete document including XML prologue.
$doc = new DOMDocument($this->_element->ownerDocument->version, $this->_element->ownerDocument->actualEncoding);
$doc->appendChild($doc->importNode($this->_element, true));
return $doc->saveXML();
}
/**
* Get the XML for only this element
*
* Returns a string of this element's XML without prologue.
*
* @return string
*/
public function saveXmlFragment() {
return $this->_element->ownerDocument->saveXML($this->_element);
}
/**
* Map variable access onto the underlying entry representation.
*
* Get-style access returns a Zend_Feed_Element representing the
* child element accessed. To get string values, use method syntax
* with the __call() overriding.
*
* @param string $var The property to access.
* @return mixed
*/
public function __get($var) {
$nodes = $this->_children($var);
$length = count($nodes);
if ($length == 1) {
return new Zend_Feed_Element($nodes[0]);
} elseif ($length > 1) {
return array_map(create_function('$e', 'return new Zend_Feed_Element($e);'), $nodes);
} else {
// When creating anonymous nodes for __set chaining, don't
// call appendChild() on them. Instead we pass the current
// element to them as an extra reference; the child is
// then responsible for appending itself when it is
// actually set. This way "if ($foo->bar)" doesn't create
// a phantom "bar" element in our tree.
if (strpos($var, ':') !== false) {
list($ns, $elt) = explode(':', $var, 2);
$node = $this->_element->ownerDocument->createElementNS(Zend_Feed::lookupNamespace($ns), $elt);
} else {
$node = $this->_element->ownerDocument->createElement($var);
}
$node = new self($node);
$node->setParent($this);
return $node;
}
}
/**
* Map variable sets onto the underlying entry representation.
*
* @param string $var The property to change.
* @param string $val The property's new value.
* @return void
* @throws Zend_Feed_Exception
*/
public function __set($var, $val) {
$this->ensureAppended();
$nodes = $this->_children($var);
if (! $nodes) {
if (strpos($var, ':') !== false) {
list($ns, $elt) = explode(':', $var, 2);
$node = $this->_element->ownerDocument->createElementNS(Zend_Feed::lookupNamespace($ns), $var, $val);
$this->_element->appendChild($node);
} else {
$node = $this->_element->ownerDocument->createElement($var, $val);
$this->_element->appendChild($node);
}
} elseif (count($nodes) > 1) {
/**
* @see Zend_Feed_Exception
*/
require_once 'external/Zend/Feed/Exception.php';
throw new Zend_Feed_Exception('Cannot set the value of multiple tags simultaneously.');
} else {
$nodes[0]->nodeValue = $val;
}
}
/**
* Map isset calls onto the underlying entry representation.
*
* @param string $var
* @return boolean
*/
public function __isset($var) {
// Look for access of the form {ns:var}. We don't use
// _children() here because we can break out of the loop
// immediately once we find something.
if (strpos($var, ':') !== false) {
list($ns, $elt) = explode(':', $var, 2);
foreach ($this->_element->childNodes as $child) {
if ($child->localName == $elt && $child->prefix == $ns) {
return true;
}
}
} else {
foreach ($this->_element->childNodes as $child) {
if ($child->localName == $var) {
return true;
}
}
}
}
/**
* Get the value of an element with method syntax.
*
* Map method calls to get the string value of the requested
* element. If there are multiple elements that match, this will
* return an array of those objects.
*
* @param string $var The element to get the string value of.
* @param mixed $unused This parameter is not used.
* @return mixed The node's value, null, or an array of nodes.
*/
public function __call($var, $unused) {
$nodes = $this->_children($var);
if (! $nodes) {
return null;
} elseif (count($nodes) > 1) {
return $nodes;
} else {
return $nodes[0]->nodeValue;
}
}
/**
* Remove all children matching $var.
*
* @param string $var
* @return void
*/
public function __unset($var) {
$nodes = $this->_children($var);
foreach ($nodes as $node) {
$parent = $node->parentNode;
$parent->removeChild($node);
}
}
/**
* Returns the nodeValue of this element when this object is used
* in a string context.
*
* @return string
*/
public function __toString() {
return $this->_element->nodeValue;
}
/**
* Finds children with tagnames matching $var
*
* Similar to SimpleXML's children() method.
*
* @param string $var Tagname to match, can be either namespace:tagName or just tagName.
* @return array
*/
protected function _children($var) {
$found = array();
// Look for access of the form {ns:var}.
if (strpos($var, ':') !== false) {
list($ns, $elt) = explode(':', $var, 2);
foreach ($this->_element->childNodes as $child) {
if ($child->localName == $elt && $child->prefix == $ns) {
$found[] = $child;
}
}
} else {
foreach ($this->_element->childNodes as $child) {
if ($child->localName == $var) {
$found[] = $child;
}
}
}
return $found;
}
/**
* Required by the ArrayAccess interface.
*
* @param string $offset
* @return boolean
*/
public function offsetExists($offset) {
if (strpos($offset, ':') !== false) {
list($ns, $attr) = explode(':', $offset, 2);
return $this->_element->hasAttributeNS(Zend_Feed::lookupNamespace($ns), $attr);
} else {
return $this->_element->hasAttribute($offset);
}
}
/**
* Required by the ArrayAccess interface.
*
* @param string $offset
* @return string
*/
public function offsetGet($offset) {
if (strpos($offset, ':') !== false) {
list($ns, $attr) = explode(':', $offset, 2);
return $this->_element->getAttributeNS(Zend_Feed::lookupNamespace($ns), $attr);
} else {
return $this->_element->getAttribute($offset);
}
}
/**
* Required by the ArrayAccess interface.
*
* @param string $offset
* @param string $value
* @return string
*/
public function offsetSet($offset, $value) {
$this->ensureAppended();
if (strpos($offset, ':') !== false) {
list($ns, $attr) = explode(':', $offset, 2);
return $this->_element->setAttributeNS(Zend_Feed::lookupNamespace($ns), $attr, $value);
} else {
return $this->_element->setAttribute($offset, $value);
}
}
/**
* Required by the ArrayAccess interface.
*
* @param string $offset
* @return boolean
*/
public function offsetUnset($offset) {
if (strpos($offset, ':') !== false) {
list($ns, $attr) = explode(':', $offset, 2);
return $this->_element->removeAttributeNS(Zend_Feed::lookupNamespace($ns), $attr);
} else {
return $this->_element->removeAttribute($offset);
}
}
}
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