CoalescingDirectoryResource.php

<?php

/*
 * This file is part of the Assetic package, an OpenSky project.
 *
 * (c) 2010-2012 OpenSky Project Inc
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace Assetic\Factory\Resource;


/**
 * Coalesces multiple directories together into one merged resource.
 *
 * @author Kris Wallsmith <kris.wallsmith@gmail.com>
 */
class CoalescingDirectoryResource implements IteratorResourceInterface {
  private $directories;
  public function __construct($directories) {
    $this->directories = array();
    foreach ($directories as $directory) {
      $this
        ->addDirectory($directory);
    }
  }
  public function addDirectory(IteratorResourceInterface $directory) {
    $this->directories[] = $directory;
  }
  public function isFresh($timestamp) {
    foreach ($this
      ->getFileResources() as $file) {
      if (!$file
        ->isFresh($timestamp)) {
        return false;
      }
    }
    return true;
  }
  public function getContent() {
    $parts = array();
    foreach ($this
      ->getFileResources() as $file) {
      $parts[] = $file
        ->getContent();
    }
    return implode("\n", $parts);
  }

  /**
   * Returns a string to uniquely identify the current resource.
   *
   * @return string An identifying string
   */
  public function __toString() {
    $parts = array();
    foreach ($this->directories as $directory) {
      $parts[] = (string) $directory;
    }
    return implode(',', $parts);
  }
  public function getIterator() {
    return new \ArrayIterator($this
      ->getFileResources());
  }

  /**
   * Returns the relative version of a filename.
   *
   * @param ResourceInterface $file      The file
   * @param ResourceInterface $directory The directory
   *
   * @return string The name to compare with files from other directories
   */
  protected function getRelativeName(ResourceInterface $file, ResourceInterface $directory) {
    return substr((string) $file, strlen((string) $directory));
  }

  /**
   * Performs the coalesce.
   *
   * @return array An array of file resources
   */
  private function getFileResources() {
    $paths = array();
    foreach ($this->directories as $directory) {
      foreach ($directory as $file) {
        $relative = $this
          ->getRelativeName($file, $directory);
        if (!isset($paths[$relative])) {
          $paths[$relative] = $file;
        }
      }
    }
    return array_values($paths);
  }

}