124 lines
2.9 KiB
PHP
124 lines
2.9 KiB
PHP
<?php
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namespace SilverStripe\TextExtraction\Extension;
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use SilverStripe\Assets\File;
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use SilverStripe\ORM\DataExtension;
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use SilverStripe\TextExtraction\Cache\FileTextCache;
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use SilverStripe\TextExtraction\Extractor\FileTextExtractor;
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/**
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* Decorate File or a File derivative to enable text extraction from the file content. Uses a set of subclasses of
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* FileTextExtractor to do the extraction based on the content type of the file.
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*
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* Adds an additional property which is the cached contents, which is populated on demand.
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*
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* @author mstephens
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*/
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class FileTextExtractable extends DataExtension
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{
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/**
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* @var array
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* @config
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*/
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private static $db = [
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'FileContentCache' => 'Text'
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];
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/**
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* @var array
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* @config
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*/
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private static $casting = [
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'FileContent' => 'Text'
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];
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/**
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* @var array
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* @config
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*/
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private static $dependencies = [
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'TextCache' => '%$' . FileTextCache::class,
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];
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/**
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* @var FileTextCache
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*/
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protected $fileTextCache = null;
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/**
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* @param FileTextCache $cache
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* @return $this
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*/
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public function setTextCache(FileTextCache $cache)
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{
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$this->fileTextCache = $cache;
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return $this;
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}
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/**
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* @return FileTextCache
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*/
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public function getTextCache()
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{
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return $this->fileTextCache;
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}
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/**
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* Helper function for template
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*
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* @return string
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*/
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public function getFileContent()
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{
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return $this->extractFileAsText();
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}
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/**
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* Tries to parse the file contents if a FileTextExtractor class exists to handle the file type, and
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* returns the text. The value is also cached into the File record itself.
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*
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* @param boolean $disableCache If false, the file content is only parsed on demand.
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* If true, the content parsing is forced, bypassing
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* the cached version
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* @return string|null
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*/
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public function extractFileAsText($disableCache = false)
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{
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/** @var File $file */
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$file = $this->owner;
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if (!$disableCache) {
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$text = $this->getTextCache()->load($file);
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if ($text) {
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return $text;
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}
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}
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// Determine which extractor can process this file.
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$extractor = FileTextExtractor::for_file($file);
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if (!$extractor) {
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return null;
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}
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$text = $extractor->getContent($file);
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if (!$text) {
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return null;
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}
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if (!$disableCache) {
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$this->getTextCache()->save($file, $text);
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}
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return $text;
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}
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/**
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* @return void
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*/
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public function onBeforeWrite()
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{
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// Clear cache before changing file
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$this->getTextCache()->invalidate($this->owner);
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}
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}
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