File.php

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<?php
namespace Magento\Framework\View\Asset;

class File implements MergeableInterface
{
    protected $filePath;

    protected $module;

    protected $contentType;

    protected $context;

    protected $source;

    private $resolvedFile;

    private $minification;

    private $sourceContentType;

    public function __construct(
        Source $source,
        ContextInterface $context,
        $filePath,
        $module,
        $contentType,
        Minification $minification
    ) {
        $this->source = $source;
        $this->context = $context;
        $this->filePath = $filePath;
        $this->module = $module;
        $this->contentType = $contentType;
        $this->minification = $minification;
    }

    public function getUrl()
    {
        return $this->context->getBaseUrl() . $this->getPath();
    }

    public function getSourceUrl()
    {
        return $this->context->getBaseUrl() . $this->getRelativeSourceFilePath();
    }

    public function getContentType()
    {
        return $this->contentType;
    }

    public function getPath()
    {
        $result = '';
        $result = $this->join($result, $this->context->getPath());
        $result = $this->join($result, $this->module);
        $result = $this->join($result, $this->filePath);
        $result = $this->minification->addMinifiedSign($result);
        return $result;
    }

    public function getRelativeSourceFilePath()
    {
        $path = $this->filePath;
        $sourcePath = $this->source->findSource($this);
        if ($sourcePath) {
            $origExt = pathinfo($path, PATHINFO_EXTENSION);
            $ext = pathinfo($sourcePath, PATHINFO_EXTENSION);
            $path = str_replace('.' . $origExt, '.' . $ext, $this->filePath);
        }
        $result = '';
        $result = $this->join($result, $this->context->getPath());
        $result = $this->join($result, $this->module);
        $result = $this->join($result, $path);
        return $result;
    }

    private function join($path, $item)
    {
        return trim($path . ($item ? '/' . $item : ''), '/');
    }

    public function getSourceFile()
    {
        if (null === $this->resolvedFile) {
            $this->resolvedFile = $this->source->getFile($this);
            if (false === $this->resolvedFile) {
                throw new File\NotFoundException("Unable to resolve the source file for '{$this->getPath()}'");
            }
        }
        return $this->resolvedFile;
    }

    public function getSourceContentType()
    {
        if ($this->sourceContentType === null) {
            $this->sourceContentType = $this->source->getSourceContentType($this);
        }
        return $this->sourceContentType;
    }

    public function getContent()
    {
        $content = $this->source->getContent($this);
        if (false === $content) {
            throw new File\NotFoundException("Unable to get content for '{$this->getPath()}'");
        }
        return $content;
    }

    public function getFilePath()
    {
        return $this->filePath;
    }

    public function getContext()
    {
        return $this->context;
    }

    public function getModule()
    {
        return $this->module;
    }
}