/**
         * Determines if this is an output location.  An output
         * location is a location that is conventionally used for
         * output.
         *
         * @return true if this is an output location, false otherwise
         */
        boolean isOutputLocation();
    }

    /**
     * Gets a class loader for loading plug-ins from the given
     * location.  For example, to load annotation processors, a
     * compiler will request a class loader for the {@link
     * StandardLocation#ANNOTATION_PROCESSOR_PATH
     * ANNOTATION_PROCESSOR_PATH} location.
     *
     * @param location a location
     * @return a class loader for the given location; or {@code null}
     * if loading plug-ins from the given location is disabled or if
     * the location is not known
     * @throws SecurityException if a class loader can not be created
     * in the current security context
     * @throws IllegalStateException if {@link #close} has been called
     * and this file manager cannot be reopened
     */
    ClassLoader getClassLoader(Location location);

    /**
     * Lists all file objects matching the given criteria in the given
     * location.  List file objects in "subpackages" if recurse is
     * true.
     *
     * <p>Note: even if the given location is unknown to this file
     * manager, it may not return {@code null}.  Also, an unknown
     * location may not cause an exception.
     *
     * @param location     a location
     * @param packageName  a package name
     * @param kinds        return objects only of these kinds
     * @param recurse      if true include "subpackages"
     * @return an Iterable of file objects matching the given criteria
     * @throws IOException if an I/O error occurred, or if {@link
     * #close} has been called and this file manager cannot be
     * reopened
     * @throws IllegalStateException if {@link #close} has been called
     * and this file manager cannot be reopened
     */
    Iterable<JavaFileObject> list(Location location,
                                  String packageName,
                                  Set<Kind> kinds,
                                  boolean recurse)
        throws IOException;

    /**
     * Infers a binary name of a file object based on a location.  The
     * binary name returned might not be a valid JLS binary name.
     *
     * @param location a location
     * @param file a file object
     * @return a binary name or {@code null} the file object is not
     * found in the given location
     * @throws IllegalStateException if {@link #close} has been called
     * and this file manager cannot be reopened
     */
    String inferBinaryName(Location location, JavaFileObject file);

    /**
     * Compares two file objects and return true if they represent the
     * same underlying object.
     *
     * @param a a file object
     * @param b a file object
     * @return true if the given file objects represent the same
     * underlying object
     *
     * @throws IllegalArgumentException if either of the arguments
     * were created with another file manager and this file manager
     * does not support foreign file objects
     */
    boolean isSameFile(FileObject a, FileObject b);

    /**
     * Handles one option.  If {@code current} is an option to this
     * file manager it will consume any arguments to that option from
     * {@code remaining} and return true, otherwise return false.
     *
     * @param current current option
     * @param remaining remaining options
     * @return true if this option was handled by this file manager,
     * false otherwise
     * @throws IllegalArgumentException if this option to this file
     * manager is used incorrectly
     * @throws IllegalStateException if {@link #close} has been called
     * and this file manager cannot be reopened
     */
    boolean handleOption(String current, Iterator<String> remaining);

    /**