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<?php
/**
* TXmlTransform class file
*
* @author Knut Urdalen <knut.urdalen@gmail.com>
* @author Qiang Xue <qiang.xue@gmail.com>
* @link http://www.pradosoft.com
* @copyright Copyright © 2005-2013 PradoSoft
* @license http://www.pradosoft.com/license/
* @package System.Web.UI.WebControls
*/
/**
* TXmlTransform class
*
* TXmlTransform uses the PHP's XSL extension to perform
* {@link http://www.w3.org/TR/xslt XSL transformations} using the
* {@link http://xmlsoft.org/XSLT/ libxslt library}.
*
* To associate an XML style sheet with TXmlTransform set the
* {@link setTransformPath TransformPath} property to the namespace or path to the style sheet
* or set the {@link setTransformContent TransformContent} property to the XML style sheet
* data as a string.
*
* To associate the XML data to be transformed set the {@link setDocumentPath DocumentPath}
* property to the namespace or path to the XML document or set the
* {@link setDocumentContent DocumentContent} property to the XML data as a string.
*
* To add additional parameters to the transformation process you can use the {@link getParameters Parameters}
* property.
*
* @author Knut Urdalen <knut.urdalen@gmail.com>
* @author Qiang Xue <qiang.xue@gmail.com>
* @package System.Web.UI.WebControls
* @since 3.1
*/
class TXmlTransform extends TControl {
const EXT_XML_FILE = '.xml';
const EXT_XSL_FILE = '.xsl';
/**
* Constructor
*
* Initializes the TXmlTransform object and ensure that the XSL extension is available
* @throws TConfigurationException If XSL extension is not available
*/
public function __construct() {
if(!class_exists('XSLTProcessor', false)) {
throw new TConfigurationException('xmltransform_xslextension_required');
}
}
/**
* @return string The path to the XML style sheet.
*/
public function getTransformPath() {
return $this->getViewState('TransformPath', '');
}
/**
* @param string The path to the XML style sheet. It must be in namespace format.
*/
public function setTransformPath($value) {
if(!is_file($value)) {
$value = Prado::getPathOfNamespace($value, self::EXT_XSL_FILE);
if($value === null) {
throw new TInvalidDataValueException('xmltransform_transformpath_invalid', $value);
}
}
$this->setViewState('TransformPath', $value, '');
}
/**
* @return string XML style sheet as string
*/
public function getTransformContent() {
return $this->getViewState('TransformContent', '');
}
/**
* @param string $value XML style sheet as string
*/
public function setTransformContent($value) {
$this->setViewState('TransformContent', $value, '');
}
/**
* @return string The path to the XML document. It must be in namespace format.
*/
public function getDocumentPath() {
return $this->getViewState('DocumentPath', '');
}
/**
* @param string Namespace or path to XML document
* @throws TInvalidDataValueException
*/
public function setDocumentPath($value) {
if(!is_file($value)) {
$value = Prado::getPathOfNamespace($value, self::EXT_XML_FILE);
if($value === null) {
throw new TInvalidDataValueException('xmltransform_documentpath_invalid', $value);
}
}
$this->setViewState('DocumentPath', $value, '');
}
/**
* @return string XML data
*/
public function getDocumentContent() {
return $this->getViewState('DocumentContent', '');
}
/**
* @param string $value XML data. If not empty, it takes precedence over {@link setDocumentPath DocumentPath}.
*/
public function setDocumentContent($value) {
$this->setViewState('DocumentContent', $value, '');
}
/**
* Returns the list of parameters to be applied to the transform.
* @return TAttributeCollection the list of custom parameters
*/
public function getParameters() {
if($params = $this->getViewState('Parameters',null)) {
return $params;
} else {
$params = new TAttributeCollection();
$this->setViewState('Parameters', $params, null);
return $params;
}
}
private function getTransformXmlDocument() {
if(($content = $this->getTransformContent()) !== '') {
$document = new DOMDocument();
$document->loadXML($content);
return $document;
} else if(($path = $this->getTransformPath()) !== '') {
$document = new DOMDocument();
$document->load($path);
return $document;
} else {
throw new TConfigurationException('xmltransform_transform_required');
}
}
private function getSourceXmlDocument() {
if(($content = $this->getDocumentContent()) !== '') {
$document = new DOMDocument();
$document->loadXML($content);
return $document;
} else if(($path = $this->getDocumentPath()) !== '') {
$document = new DOMDocument();
$document->load($path);
return $document;
} else {
return null;
}
}
/**
* Performs XSL transformation and render the output.
* @param THtmlWriter The writer used for the rendering purpose
*/
public function render($writer) {
if(($document=$this->getSourceXmlDocument()) === null) {
$htmlWriter = Prado::createComponent($this->GetResponse()->getHtmlWriterType(), new TTextWriter());
parent::render($htmlWriter);
$document = new DOMDocument();
$document->loadXML($htmlWriter->flush());
}
$stylesheet = $this->getTransformXmlDocument();
// Perform XSL transformation
$xslt = new XSLTProcessor();
$xslt->importStyleSheet($stylesheet);
// Check for parameters
$parameters = $this->getParameters();
foreach($parameters as $name => $value) {
$xslt->setParameter('', $name, $value);
}
$output = $xslt->transformToXML($document);
// Write output
$writer->write($output);
}
}
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