<?php
/**
 * Provides a generic pattern for different mapping types within the application
 * directory.
 *
 * @author   Bob Mckee <bmckee@bywires.com>
 * @author   Chuck Hagenbuch <chuck@horde.org>
 * @category Horde
 * @package  Autoloader
 */
class Horde_Autoloader_ClassPathMapper_Application implements Horde_Autoloader_ClassPathMapper
{
    protected $_appDir;
    protected $_mappings = array();

    /**
     * The following constants are for naming the positions in the regex for
     * easy readability later.
     */
    const APPLICATION_POS = 1;
    const ACTION_POS = 2;
    const SUFFIX_POS = 3;

    const NAME_SEGMENT = '([0-9A-Z][0-9A-Za-z]+)+';

    public function __construct($appDir)
    {
        $this->_appDir = rtrim($appDir, '/') . '/';
    }

    public function addMapping($classSuffix, $subDir)
    {
        $this->_mappings[$classSuffix] = $subDir;
        $this->_classMatchRegex = '/^' . self::NAME_SEGMENT . '_' . self::NAME_SEGMENT . '_' .
            '(' . implode('|', array_keys($this->_mappings)) . ')$/';
    }

    public function mapToPath($className)
    {
        if (preg_match($this->_classMatchRegex, $className, $matches)) {
            return $this->_appDir . $this->_mappings[$matches[self::SUFFIX_POS]] . '/' . $matches[self::ACTION_POS] . '.php';
        }
    }

    public function __toString()
    {
        return get_class($this) . ' ' . $this->_classMatchRegex . ' [' . $this->_appDir . ']';
    }
}