UnknownContentHandler.php

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<?php
class UnknownContentHandler extends ContentHandler {
 
    public function __construct( $modelId, $formats = null ) {
        parent::__construct(
            $modelId,
            $formats ?? [
                'application/octet-stream',
                'application/unknown',
                'application/x-binary',
                'text/unknown',
                'unknown/unknown',
            ]
        );
    }
 
    public function serializeContent( Content $content, $format = null ) {
        '@phan-var UnknownContent $content';
        return $content->getData();
    }
 
    public function unserializeContent( $blob, $format = null ) {
        return new UnknownContent( $blob, $this->getModelID() );
    }
 
    public function makeEmptyContent() {
        return $this->unserializeContent( '' );
    }
 
    public function supportsDirectEditing() {
        return false;
    }
 
    protected function getSlotDiffRendererInternal( IContextSource $context ) {
        return new UnsupportedSlotDiffRenderer( $context );
    }
}