<?php

namespace Lurker\Event;

use Lurker\Exception\InvalidArgumentException;
use Lurker\Resource\DirectoryResource;
use Lurker\Resource\FileResource;
use Lurker\Resource\ResourceInterface;
use Lurker\Resource\TrackedResource;

trait FilesystemEventTrait
{
    private $tracked;
    private $resource;
    private $type;

    protected static $types = array(
    1 => 'create',
    2 => 'modify',
    4 => 'delete',
    );

    /**
     * Initializes resource event.
     *
     * @param TrackedResource   $tracked  resource, that being tracked
     * @param ResourceInterface $resource resource instance
     * @param integer           $type     event type bit
     */
    public function __construct(TrackedResource $tracked, ResourceInterface $resource, $type)
    {
        if (!isset(self::$types[$type])) {
            throw new InvalidArgumentException('Wrong event type providen');
        }

        $this->tracked  = $tracked;
        $this->resource = $resource;
        $this->type     = $type;
    }

    /**
     * Returns resource, that being tracked while event occured.
     *
     * @return int
     */
    public function getTrackedResource()
    {
        return $this->tracked;
    }

    /**
     * Returns changed resource.
     *
     * @return ResourceInterface
     */
    public function getResource()
    {
        return $this->resource;
    }

    /**
     * Returns true is resource, that fired event is file.
     *
     * @return Boolean
     */
    public function isFileChange()
    {
        return $this->resource instanceof FileResource;
    }

    /**
     * Returns true is resource, that fired event is directory.
     *
     * @return Boolean
     */
    public function isDirectoryChange()
    {
        return $this->resource instanceof DirectoryResource;
    }

    /**
     * Returns event type.
     *
     * @return integer
     */
    public function getType()
    {
        return $this->type;
    }

    /**
     * Returns event type string representation.
     *
     * @return string
     */
    public function getTypeString()
    {
        return self::$types[$this->getType()];
    }
}
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