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Diffstat (limited to 'framework/Util/TParameterModule.php')
| -rw-r--r-- | framework/Util/TParameterModule.php | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/framework/Util/TParameterModule.php b/framework/Util/TParameterModule.php new file mode 100644 index 00000000..a72e8fe8 --- /dev/null +++ b/framework/Util/TParameterModule.php @@ -0,0 +1,131 @@ +<?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 $Revision: $ $Date: $
+ * @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 $Revision: $ $Date: $
+ * @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);
+ }
+}
+
+?>
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