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<?php
//
// +----------------------------------------------------------------------+
// | PHP Version 4 |
// +----------------------------------------------------------------------+
// | Copyright (c) 1997-2002 The PHP Group |
// +----------------------------------------------------------------------+
// | This source file is subject to version 2.02 of the PHP license, |
// | that is bundled with this package in the file LICENSE, and is |
// | available at through the world-wide-web at |
// | http://www.php.net/license/2_02.txt. |
// | If you did not receive a copy of the PHP license and are unable to |
// | obtain it through the world-wide-web, please send a note to |
// | license@php.net so we can mail you a copy immediately. |
// +----------------------------------------------------------------------+
// | Author: Stig Bakken <ssb@fast.no> |
// +----------------------------------------------------------------------+
//
// $Id$
require_once "PEAR.php";
/**
* List of commands and what classes they are implemented in.
* @var array command => implementing class
*/
$GLOBALS['_PEAR_Command_commandlist'] = array();
/**
* PEAR command class, a simple factory class for administrative
* commands.
*
* How to implement command classes:
*
* - The class must be called PEAR_Command_Nnn, installed in the
* "PEAR/Common" subdir, with a method called getCommands() that
* returns an array of the commands implemented by the class (see
* PEAR/Command/Install.php for an example).
*
* - The class must implement a run() function that is called with three
* params:
*
* (string) command name
* (array) assoc array with options, freely defined by each
* command, for example:
* array('force' => true)
* (array) list of the other parameters
*
* The run() function returns a PEAR_CommandResponse object. Use
* these methods to get information:
*
* int getStatus() Returns PEAR_COMMAND_(SUCCESS|FAILURE|PARTIAL)
* *_PARTIAL means that you need to issue at least
* one more command to complete the operation
* (used for example for validation steps).
*
* string getMessage() Returns a message for the user. Remember,
* no HTML or other interface-specific markup.
*
* If something unexpected happens, run() returns a PEAR error.
*
* - DON'T OUTPUT ANYTHING! Return text for output instead.
*
* - DON'T USE HTML! The text you return will be used from both Gtk,
* web and command-line interfaces, so for now keep everything to
* plain text.
*
* - DON'T USE EXIT OR DIE! Always use pear errors. From static
* classes do PEAR::raiseError(), from other classes do
* $this->raiseError().
*/
class PEAR_Command
{
/**
* Get the right object for executing a command.
*
* @param object Instance of PEAR_Config object
* @param string The name of the command
*
* @return object the command object or a PEAR error
*
* @access public
*/
function factory(&$config, $command)
{
if (empty($GLOBALS['_PEAR_Command_commandlist'])) {
PEAR_Command::registerCommands();
}
if (isset($GLOBALS['_PEAR_Command_commandlist'][$command])) {
$class = $GLOBALS['_PEAR_Command_commandlist'][$command];
$obj =& new $class($config);
return $obj;
}
return PEAR::raiseError("unknown command: $command");
}
/**
* Scan through the Command directory looking for classes
* and see what commands they implement.
*
* @param bool (optional) if FALSE (default), the new list of
* commands should replace the current one. If TRUE,
* new entries will be merged with old.
*
* @param string (optional) where (what directory) to look for
* classes, defaults to the Command subdirectory of
* the directory from where this file (__FILE__) is
* included.
*
* @return bool TRUE on success, a PEAR error on failure
*
* @access public
*/
function registerCommands($merge = false, $dir = null)
{
if ($dir === null) {
$dir = dirname(__FILE__) . '/Command';
}
$dp = @opendir($dir);
if (empty($dp)) {
return PEAR::raiseError("PEAR_Command::registerCommands: opendir($dir) failed");
}
if (!$merge) {
$GLOBALS['_PEAR_Command_commandlist'] = array();
}
while ($entry = readdir($dp)) {
if ($entry{0} == '.' || substr($entry, -4) != '.php' || $entry == 'Common.php') {
continue;
}
$class = "PEAR_Command_".substr($entry, 0, -4);
$file = "$dir/$entry";
include_once $file;
$implements = call_user_func(array($class, "getCommands"));
foreach ($implements as $command) {
$GLOBALS['_PEAR_Command_commandlist'][$command] = $class;
}
}
return true;
}
/**
* Get the list of currently supported commands, and what
* classes implement them.
*
* @return array command => implementing class
*
* @access public
*/
function getCommands()
{
return $GLOBALS['_PEAR_Command_commandlist'];
}
}
?>
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