mirror of
https://github.com/silverstripe/silverstripe-textextraction
synced 2024-10-22 11:06:00 +02:00
58 lines
1.4 KiB
PHP
58 lines
1.4 KiB
PHP
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<?php
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/**
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* A decorator for File or a subclass that provides a method for extracting full-text from the file's external contents.
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* @author mstephens
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*
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*/
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abstract class FileTextExtractor extends Object {
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/**
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* Set priority from 0-100.
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* The highest priority extractor for a given content type will be selected.
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*
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* @var int
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*/
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public static $priority = 50;
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protected static $sorted_extractor_classes = null;
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/**
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* @param DataObject $file
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* @return FileTextExtractor
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*/
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static function for_file($file) {
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$extension = strtolower($file->getExtension());
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if (!self::$sorted_extractor_classes) {
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// Generate the sorted list of extractors on demand.
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$classes = ClassInfo::subclassesFor("FileTextExtractor");
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array_shift($classes);
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$sortedClasses = array();
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foreach($classes as $class) $sortedClasses[$class] = Object::get_static($class, 'priority');
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arsort($sortedClasses);
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self::$sorted_extractor_classes = $sortedClasses;
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}
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foreach(self::$sorted_extractor_classes as $className => $priority) {
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$formatter = new $className();
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if(in_array($extension, $formatter->supportedExtensions())) {
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return $formatter;
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}
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}
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}
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/**
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* Return an array of content types that the extractor can handle.
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* @return unknown_type
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*/
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abstract function supportedExtensions();
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/**
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* Given a file object, extract the contents as text
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* @param $file
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* @return unknown_type
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*/
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abstract function getContent($file);
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}
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?>
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