<?php

/**

 * Zend Framework

 *

 * LICENSE

 *

 * This source file is subject to the new BSD license that is bundled

 * with this package in the file LICENSE.txt.

 * It is also available through the world-wide-web at this URL:

 * http://framework.zend.com/license/new-bsd

 * If you did not receive a copy of the license and are unable to

 * obtain it through the world-wide-web, please send an email

 * to license@zend.com so we can send you a copy immediately.

 *

 * @category   Zend

 * @package    Zend_Tool

 * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)

 * @license    http://framework.zend.com/license/new-bsd     New BSD License

 * @version    $Id: Repository.php 20096 2010-01-06 02:05:09Z bkarwin $

 */

require_once 'Zend/Tool/Project/Context/System/Interface.php';

require_once 'Zend/Tool/Project/Context/System/TopLevelRestrictable.php';

require_once 'Zend/Tool/Project/Context/System/NotOverwritable.php';

/**

 * @category   Zend

 * @package    Zend_Tool

 * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)

 * @license    http://framework.zend.com/license/new-bsd     New BSD License

 */

class Zend_Tool_Project_Context_Repository implements Countable

{

    protected static $_instance = null;

    protected static $_isInitialized = false;

    protected $_shortContextNames = array();

    protected $_contexts          = array();

    /**

     * Enter description here...

     *

     * @return Zend_Tool_Project_Context_Repository

     */

    public static function getInstance()

    {

        if (self::$_instance == null) {

            self::$_instance = new self();

        }

        return self::$_instance;

    }

    public static function resetInstance()

    {

        self::$_instance = null;

        self::$_isInitialized = false;

    }

    protected function __construct()

    {

        if (self::$_isInitialized == false) {

            $this->addContextClass('Zend_Tool_Project_Context_System_ProjectDirectory')

                 ->addContextClass('Zend_Tool_Project_Context_System_ProjectProfileFile')

                 ->addContextClass('Zend_Tool_Project_Context_System_ProjectProvidersDirectory');

            self::$_isInitialized = true;

        }

    }

    public function addContextsFromDirectory($directory, $prefix)

    {

        $prefix = trim($prefix, '_') . '_';

        foreach (new DirectoryIterator($directory) as $directoryItem) {

            if ($directoryItem->isDot() || (substr($directoryItem->getFilename(), -4) !== '.php')) {

                continue;

            }

            $class = $prefix . substr($directoryItem->getFilename(), 0, -4);

            $this->addContextClass($class);

        }

    }

    public function addContextClass($contextClass)

    {

        if (!class_exists($contextClass)) {

            require_once 'Zend/Loader.php';

            Zend_Loader::loadClass($contextClass);

        }

        $reflectionContextClass = new ReflectionClass($contextClass);

        if ($reflectionContextClass->isInstantiable()) {

            $context = new $contextClass();

            return $this->addContext($context);

        }

        return $this;

    }

    /**

     * Enter description here...

     *

     * @param Zend_Tool_Project_Context_Interface $context

     * @return Zend_Tool_Project_Context_Repository

     */

    public function addContext(Zend_Tool_Project_Context_Interface $context)

    {

        $isSystem       = ($context instanceof Zend_Tool_Project_Context_System_Interface);

        $isTopLevel     = ($context instanceof Zend_Tool_Project_Context_System_TopLevelRestrictable);

        $isOverwritable = !($context instanceof Zend_Tool_Project_Context_System_NotOverwritable);

        $index = (count($this->_contexts)) ? max(array_keys($this->_contexts)) + 1 : 1;

        $normalName = $this->_normalizeName($context->getName());

        if (isset($this->_shortContextNames[$normalName]) && ($this->_contexts[$this->_shortContextNames[$normalName]]['isOverwritable'] === false) ) {

            require_once 'Zend/Tool/Project/Context/Exception.php';

            throw new Zend_Tool_Project_Context_Exception('Context ' . $context->getName() . ' is not overwriteable.');

        }

        $this->_shortContextNames[$normalName] = $index;

        $this->_contexts[$index] = array(

            'isTopLevel'     => $isTopLevel,

            'isSystem'       => $isSystem,

            'isOverwritable' => $isOverwritable,

            'normalName'     => $normalName,

            'context'        => $context

            );

        return $this;

    }

    public function getContext($name)

    {

        if (!$this->hasContext($name)) {

            require_once 'Zend/Tool/Project/Context/Exception.php';

            throw new Zend_Tool_Project_Context_Exception('Context by name ' . $name . ' does not exist in the registry.');

        }

        $name = $this->_normalizeName($name);

        return clone $this->_contexts[$this->_shortContextNames[$name]]['context'];

    }

    public function hasContext($name)

    {

        $name = $this->_normalizeName($name);

        return (isset($this->_shortContextNames[$name]) ? true : false);

    }

    public function isSystemContext($name)

    {

        if (!$this->hasContext($name)) {

            return false;

        }

        $name = $this->_normalizeName($name);

        $index = $this->_shortContextNames[$name];

        return $this->_contexts[$index]['isSystemContext'];

    }

    public function isTopLevelContext($name)

    {

        if (!$this->hasContext($name)) {

            return false;

        }

        $name = $this->_normalizeName($name);

        $index = $this->_shortContextNames[$name];

        return $this->_contexts[$index]['isTopLevel'];

    }

    public function isOverwritableContext($name)

    {

        if (!$this->hasContext($name)) {

            return false;

        }

        $name = $this->_normalizeName($name);

        $index = $this->_shortContextNames[$name];

        return $this->_contexts[$index]['isOverwritable'];

    }

    public function count()

    {

        return count($this->_contexts);

    }

    protected function _normalizeName($name)

    {

        return strtolower($name);

    }

}