<?php /** * TParameterModule class * * @author Qiang Xue <qiang.xue@gmail.com> * @link http://www.pradosoft.com/ * @copyright Copyright © 2005 PradoSoft * @license http://www.pradosoft.com/license/ * @version $Id$ * @package System.Util */ /** * TParameterModule class * * TParameterModule enables loading application parameters from external * storage other than the application configuration. * To load parameters from an XML file, configure the module by setting * its {@link setParameterFile ParameterFile} property. * Note, the property only accepts a file path in namespace format with * file extension being '.xml'. The file format is as follows, which is * similar to the parameter portion in an application configuration, * <code> * <parameters> * <parameter id="param1" value="paramValue1" /> * <parameter id="param2" Property1="Value1" Property2="Value2" ... /> * </parameters> * </code> * * In addition, any content enclosed within the module tag is also treated * as parameters, e.g., * <code> * <module class="System.Util.TParameterModule"> * <parameter id="param1" value="paramValue1" /> * <parameter id="param2" Property1="Value1" Property2="Value2" ... /> * </module> * </code> * * If a parameter is defined both in the external file and within the module * tag, the former takes precedence. * * @author Qiang Xue <qiang.xue@gmail.com> * @version $Id$ * @package System.Util * @since 3.0 */ class TParameterModule extends TModule { const PARAM_FILE_EXT='.xml'; private $_initialized=false; private $_paramFile=null; /** * Initializes the module by loading parameters. * @param TXmlElement content enclosed within the module tag */ public function init($config) { $this->loadParameters($config); if($this->_paramFile!==null) { $dom=new TXmlDocument; $dom->loadFromFile($this->_paramFile); $this->loadParameters($dom); } $this->_initialized=true; } /** * Loads parameters into application. * @param TXmlElement XML representation of the parameters * @throws TConfigurationException if the parameter file format is invalid */ protected function loadParameters($xmlNode) { $parameters=array(); foreach($xmlNode->getElementsByTagName('parameter') as $node) { $properties=$node->getAttributes(); if(($id=$properties->remove('id'))===null) throw new TConfigurationException('parametermodule_parameterid_required'); if(($type=$properties->remove('class'))===null) { if(($value=$properties->remove('value'))===null) $parameters[$id]=$node; else $parameters[$id]=$value; } else $parameters[$id]=array($type,$properties->toArray()); } $appParams=$this->getApplication()->getParameters(); foreach($parameters as $id=>$parameter) { if(is_array($parameter)) { $component=Prado::createComponent($parameter[0]); foreach($parameter[1] as $name=>$value) $component->setSubProperty($name,$value); $appParams->add($id,$component); } else $appParams->add($id,$parameter); } } /** * @return string the parameter file path */ public function getParameterFile() { return $this->_paramFile; } /** * @param string the parameter file path. It must be in namespace format * and the file extension is '.xml'. * @throws TInvalidOperationException if the module is initialized * @throws TConfigurationException if the file is invalid */ public function setParameterFile($value) { if($this->_initialized) throw new TInvalidOperationException('parametermodule_parameterfile_unchangeable'); else if(($this->_paramFile=Prado::getPathOfNamespace($value,self::PARAM_FILE_EXT))===null || !is_file($this->_paramFile)) throw new TConfigurationException('parametermodule_parameterfile_invalid',$value); } } ?>