void performUsing(final OpenFilesHandler handler, final _NativeEvent event) {
    // create file list from fileNames
    final List<String> fileNameList = event.get(0);
    final ArrayList<File> files = new ArrayList<File>(fileNameList.size());
    for (final String fileName : fileNameList) files.add(new File(fileName));

    // populate the properties map
    final String searchTerm = event.get(1);
    handler.openFiles(new OpenFilesEvent(files, searchTerm));
}
 

/**
 * Installs the handler which is notified when the application is asked to
 * open a list of files.
 *
 * @implNote Please note that for macOS, notifications
 * are only sent if the Java app is a bundled application,
 * with a {@code CFBundleDocumentTypes} array present in its
 * {@code Info.plist}. Check the
 * <a href="https://developer.apple.com/documentation">
 * Apple Developer Documentation</a> for more information about
 * {@code Info.plist}.
 *
 * @param openFileHandler handler
 *
 * @throws SecurityException if a security manager exists and its
 * {@link java.lang.SecurityManager#checkRead(java.lang.String)}
 * method denies read access to the files, or it denies the
 * {@code RuntimePermission("canProcessApplicationEvents")}
 * permission, or the calling thread is not allowed to create a
 * subprocess
 * @throws UnsupportedOperationException if the current platform
 * does not support the {@link Desktop.Action#APP_OPEN_FILE} action
 * @since 9
 */
public void setOpenFileHandler(final OpenFilesHandler openFileHandler) {
    checkEventsProcessingPermission();
    checkExec();
    checkRead();
    checkActionSupport(Action.APP_OPEN_FILE);
    peer.setOpenFileHandler(openFileHandler);
}
 

/**
 * Installs the handler which is notified when the application is asked to
 * open a list of files.
 *
 * @implNote Please note that for Mac OS, notifications
 * are only sent if the Java app is a bundled application,
 * with a {@code CFBundleDocumentTypes} array present in its
 * Info.plist. See the
 * <a href="http://developer.apple.com/mac/library/documentation/General/Reference/InfoPlistKeyReference">
 * Info.plist Key Reference</a> for more information about adding a
 * {@code CFBundleDocumentTypes} key to your app's Info.plist.
 *
 * @param openFileHandler handler
 *
 * @throws SecurityException if a security manager exists and its
 * {@link java.lang.SecurityManager#checkRead(java.lang.String)}
 * method denies read access to the files, or it denies the
 * {@code RuntimePermission("canProcessApplicationEvents")}
 * permission, or the calling thread is not allowed to create a
 * subprocess
 * @throws UnsupportedOperationException if the current platform
 * does not support the {@link Desktop.Action#APP_OPEN_FILE} action
 * @since 9
 */
public void setOpenFileHandler(final OpenFilesHandler openFileHandler) {
    checkEventsProcessingPermission();
    checkExec();
    checkRead();
    checkActionSupport(Action.APP_OPEN_FILE);
    peer.setOpenFileHandler(openFileHandler);
}
 

/**
 * Installs the handler which is notified when the application is asked to
 * open a list of files.
 *
 * @param openFileHandler handler
 *
 */
default void setOpenFileHandler(final OpenFilesHandler openFileHandler) {
}
 

/**
 * Installs the handler which is notified when the application is asked to
 * open a list of files.
 *
 * @param openFileHandler handler
 *
 */
default void setOpenFileHandler(final OpenFilesHandler openFileHandler) {
}
 

/**
 * Installs the handler which is notified when the application is asked to open a list of files.
 * The {@link OpenFilesHandler#openFiles(OpenFilesEvent)} notifications are only sent if the Java app is a bundled application, with a {@code CFBundleDocumentTypes} array present in it's Info.plist.
 * See the <a href="http://developer.apple.com/mac/library/documentation/General/Reference/InfoPlistKeyReference">Info.plist Key Reference</a> for more information about adding a {@code CFBundleDocumentTypes} key to your app's Info.plist.
 *
 * @param openFileHandler
 * @since Java for Mac OS X 10.6 Update 3
 * @since Java for Mac OS X 10.5 Update 8
 */
public void setOpenFileHandler(final OpenFilesHandler openFileHandler) {
    eventHandler.openFilesDispatcher.setHandler(openFileHandler);
}