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<?php
/**
* CConsoleApplication class file.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @link http://www.yiiframework.com/
* @copyright Copyright &copy; 2008-2009 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/

/**
* CConsoleApplication represents a console application.
*
* CConsoleApplication extends {@link CApplication} by providing functionalities
* specific to console requests. In particular, it deals with console requests
* through a command-based approach:
* <ul>
* <li>A console application consists of one or several possible user commands;</li>
* <li>Each user command is implemented as a class extending {@link CConsoleCommand};</li>
* <li>User specifies which command to run on the command line;</li>
* <li>The command processes the user request with the specified parameters.</li>
* </ul>
*
* The command classes reside in the directory {@link getCommandPath commandPath}.
* The name of the class follows the pattern: &lt;command-name&gt;Command, and its
* file name is the same the class name. For example, the 'ShellCommand' class defines
* a 'shell' command and the class file name is 'ShellCommand.php'.
*
* To run the console application, enter the following on the command line:
* <pre>
* php path/to/entry_script.php <command name> [param 1] [param 2] ...
* </pre>
*
* You may use the following to see help instructions about a command:
* <pre>
* php path/to/entry_script.php help <command name>
* </pre>
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @version $Id$
* @package system.console
* @since 1.0
*/
class CConsoleApplication extends CApplication
{
/**
* @var array mapping from command name to command configurations.
* Each command configuration can be either a string or an array.
* If the former, the string should be the file path of the command class.
* If the latter, the array must contain a 'class' element which specifies
* the command's class name or {@link YiiBase::getPathOfAlias class path alias}.
* The rest name-value pairs in the array are used to initialize
* the corresponding command properties. For example,
* <pre>
* array(
* 'email'=>array(
* 'class'=>'path.to.Mailer',
* 'interval'=>3600,
* ),
* 'log'=>'path/to/LoggerCommand.php',
* )
* </pre>
*/
public $commandMap=array();

private $_commandPath;
private $_runner;

/**
* Initializes the application by creating the command runner.
*/
protected function init()
{
parent::init();
if(!isset($_SERVER['argv'])) // || strncasecmp(php_sapi_name(),'cli',3))
die('This script must be run from the command line.');
$this->_runner=$this->createCommandRunner();
$this->_runner->commands=$this->commandMap;
$this->_runner->addCommands($this->getCommandPath());
}

/**
* Processes the user request.
* This method creates a console command runner to handle the particular user command.
*/
public function processRequest()
{
$this->_runner->run($_SERVER['argv']);
}

/**
* Creates the command runner instance.
* @return CConsoleCommandRunner the command runner
*/
protected function createCommandRunner()
{
return new CConsoleCommandRunner;
}

/**
* Displays the captured PHP error.
* This method displays the error in console mode when there is
* no active error handler.
* @param integer error code
* @param string error message
* @param string error file
* @param string error line
*/
public function displayError($code,$message,$file,$line)
{
echo "PHP Error[$code]: $message\n";
echo "in file $file at line $line\n";
debug_print_backtrace();
}

/**
* Displays the uncaught PHP exception.
* This method displays the exception in console mode when there is
* no active error handler.
* @param Exception the uncaught exception
*/
public function displayException($exception)
{
echo $exception;
}

/**
* @return string the directory that contains the command classes. Defaults to 'protected/commands'.
*/
public function getCommandPath()
{
if($this->_commandPath===null)
$this->setCommandPath($this->getBasePath().DIRECTORY_SEPARATOR.'commands');
return $this->_commandPath;
}

/**
* @param string the directory that contains the command classes.
* @throws CException if the directory is invalid
*/
public function setCommandPath($value)
{
if(($this->_commandPath=realpath($value))===false || !is_dir($this->_commandPath))
throw new CException(Yii::t('yii','The command path "{path}" is not a valid directory.',
array('{path}'=>$value)));
}

/**
* Returns the command runner.
* @return CConsoleCommandRunner the command runner.
*/
public function getCommandRunner()
{
return $this->_runner;
}
}
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