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<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */

namespace Magento\Framework\View;

use Magento\Framework\View\Design\ThemeInterface;

/**
 * View file in the file system with context of its identity
 */
class File
{
    /**
     * File name
     *
     * @var string
     */
    protected $filename;

    /**
     * Module
     *
     * @var string
     */
    protected $module;

    /**
     * Theme
     *
     * @var ThemeInterface
     */
    protected $theme;

    /**
     * Base flag
     *
     * @var string
     */
    protected $isBase;

    /**
     * Identifier
     *
     * @var string
     */
    protected $identifier;

    /**
     * Constructor
     *
     * @param string $filename
     * @param string $module
     * @param ThemeInterface $theme
     * @param bool $isBase
     */
    public function __construct($filename, $module, ThemeInterface $theme = null, $isBase = false)
    {
        $this->filename = $filename;
        $this->module = $module;
        $this->theme = $theme;
        $this->isBase = $isBase;
    }

    /**
     * Retrieve full filename
     *
     * @return string
     */
    public function getFilename()
    {
        return $this->filename;
    }

    /**
     * Retrieve name of a file without a directory path
     *
     * @return string
     */
    public function getName()
    {
        return basename($this->filename);
    }

    /**
     * Retrieve fully-qualified name of a module a file belongs to
     *
     * @return string
     */
    public function getModule()
    {
        return $this->module;
    }

    /**
     * Retrieve instance of a theme a file belongs to
     *
     * @return ThemeInterface|null
     */
    public function getTheme()
    {
        return $this->theme;
    }

    /**
     * Whether file is a base one
     *
     * @return bool
     */
    public function isBase()
    {
        return $this->theme === null;
    }

    /**
     * Calculate unique identifier for a view file
     *
     * @return string
     */
    public function getFileIdentifier()
    {
        if (null === $this->identifier) {
            $theme = $this->getTheme() ? ('|theme:' . $this->theme->getFullPath()) : '';
            $this->identifier = ($this->isBase ? 'base' : '')
                . $theme . '|module:' . $this->getModule() . '|file:' . $this->getName();
        }
        return $this->identifier;
    }
}