<?php

namespace Lurker\StateChecker;

use Lurker\Event\FilesystemEvent;
use Lurker\Resource\ResourceInterface;

/**
 * Abstract resource state checker class.
 *
 * @author Konstantin Kudryashov <ever.zet@gmail.com>
 */
abstract class ResourceStateChecker implements StateCheckerInterface
{
    private $resource;
    private $timestamp;
    private $eventsMask;
    private $deleted = false;

    /**
     * Initializes checker.
     *
     * @param ResourceInterface $resource   resource
     * @param integer           $eventsMask event types bitmask
     */
    public function __construct(ResourceInterface $resource, $eventsMask = FilesystemEvent::ALL)
    {
        $this->resource   = $resource;
        $this->timestamp  = $resource->getModificationTime() + 1;
        $this->eventsMask = $eventsMask;
        $this->deleted    = !$resource->exists();
    }

    /**
     * {@inheritdoc}
     */
    public function getResource()
    {
        return $this->resource;
    }

    /**
     * Returns events mask for checker.
     *
     * @return integer
     */
    public function getEventsMask()
    {
        return $this->eventsMask;
    }

    /**
     * {@inheritdoc}
     */
    public function getChangeset()
    {
        $changeset = array();

        if ($this->deleted) {
            if ($this->resource->exists()) {
                $this->timestamp = $this->resource->getModificationTime() + 1;
                $this->deleted   = false;

                if ($this->supportsEvent($event = FilesystemEvent::CREATE)) {
                    $changeset[] = array(
                        'event'    => $event,
                        'resource' => $this->resource
                    );
                }
            }
        } elseif (!$this->resource->exists()) {
            $this->deleted = true;

            if ($this->supportsEvent($event = FilesystemEvent::DELETE)) {
                $changeset[] = array(
                    'event'    => $event,
                    'resource' => $this->resource
                );
            }
        } elseif (!$this->resource->isFresh($this->timestamp)) {
            $this->timestamp = $this->resource->getModificationTime() + 1;

            if ($this->supportsEvent($event = FilesystemEvent::MODIFY)) {
                $changeset[] = array(
                    'event'    => $event,
                    'resource' => $this->resource
                );
            }
        }

        return $changeset;
    }

    /**
     * Checks whether checker supports provided resource event.
     *
     * @param integer $event
     *
     * @return Boolean
     */
    protected function supportsEvent($event)
    {
        return 0 !== ($this->eventsMask & $event);
    }

    /**
     * Checks whether resource have been previously deleted.
     *
     * @return Boolean
     */
    protected function isDeleted()
    {
        return $this->deleted;
    }
}
__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----MzM0NjY5MDcxNDQwMDgwOCA2NTkzNDQ4MTI0OTA3NTk5IDc0MDQ5OTgzOTE2ODk0MTg=