Create an Operation to open NEV on several blobs of the same document

@Operation(id = ARenderGetPreviewerUrlMultiBlob.ID, category = Constants.CAT_DOCUMENT, label = "Get ARender previewer url for multi blob", description = "Get the ARender previewer url depending on input.")
public class ARenderGetPreviewerUrlMultiBlob {

    public static final String ID = "Document.ARenderGetPreviewerUrlMultiBlob";

    @Context
    public OperationContext ctx;

    @Context
    public CoreSession coreSession;

    @Context
    protected ARenderService aRenderService;

    @Param(name = "blobXPaths", required = false, values = "file:content")
    public StringList blobXPaths = new StringList(Collections.singletonList("file:content"));

    @OperationMethod
    public Blob run(DocumentRef docRef) throws IOException {
        DocumentModel docModel = coreSession.getDocument(docRef);
        return run(docModel);
    }

    @OperationMethod
    private Blob run(DocumentModel docModel) throws IOException {
        checkPermission(coreSession, docModel.getRef());
        return buildUrl(blobXPaths.stream().map(blobXPath -> {
            Blob blob = aRenderService.getBlob(ctx, docModel, blobXPath);
            // send requested xpath to match annotation api (otherwise user annotates chain result)
            // send chain result digest as this is a discriminant for ARender Document services
            return ARenderDocumentId.from(docModel.getRepositoryName(), docModel.getId(), blobXPath, blob.getDigest());
        }).collect(Collectors.toList()));
    }
}