src/main/org/apache/tools/ant/taskdefs/optional/net/FTP.java [607:689]:
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                if (!isExcluded(name)) {
                    if (fast) {
                        if (file.isSymbolicLink()) {
                            try {
                                file.getClient().changeWorkingDirectory(file.curpwd);
                            } catch (IOException ioe) {
                                throw new BuildException("could not change directory to curpwd");
                            }
                            scandir(file.getLink(),
                                    name + File.separator, fast);
                        } else {
                            try {
                                file.getClient().changeWorkingDirectory(file.curpwd);
                            } catch (IOException ioe) {
                                throw new BuildException("could not change directory to curpwd");
                            }
                            scandir(file.getName(),
                                    name + File.separator, fast);
                        }
                    }
                    dirsIncluded.addElement(name);
                } else {
                    dirsExcluded.addElement(name);
                    if (fast && couldHoldIncluded(name)) {
                        try {
                            file.getClient().changeWorkingDirectory(file.curpwd);
                        } catch (IOException ioe) {
                            throw new BuildException("could not change directory to curpwd");
                        }
                        scandir(file.getName(),
                                name + File.separator, fast);
                    }
                }
            }
        }
        /**
         * temporary table to speed up the various scanning methods below
         *
         * @since Ant 1.6
         */
        private Map<String, FTPFile[]> fileListMap = new HashMap<>();
        /**
         * List of all scanned directories.
         *
         * @since Ant 1.6
         */

        private Map<String, FTPFileProxy> scannedDirs = new HashMap<>();

        /**
         * Has the directory with the given path relative to the base
         * directory already been scanned?
         *
         * @since Ant 1.6
         */
        private boolean hasBeenScanned(String vpath) {
            return scannedDirs.containsKey(vpath);
        }

        /**
         * Clear internal caches.
         *
         * @since Ant 1.6
         */
        private void clearCaches() {
            fileListMap.clear();
            scannedDirs.clear();
        }
        /**
         * list the files present in one directory.
         * @param directory full path on the remote side
         * @param changedir if true change to directory directory before listing
         * @return array of FTPFile
         */
        public FTPFile[] listFiles(String directory, boolean changedir) {
            String currentPath = directory;
            if (changedir) {
                try {
                    if (!ftp.changeWorkingDirectory(directory)) {
                        return null;
                    }
                    currentPath = ftp.printWorkingDirectory();
                } catch (IOException ioe) {
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src/main/org/apache/tools/ant/taskdefs/optional/net/FTPTaskMirrorImpl.java [480:566]:
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                if (!isExcluded(name)) {
                    if (fast) {
                        if (file.isSymbolicLink()) {
                            try {
                                file.getClient().changeWorkingDirectory(file.curpwd);
                            } catch (IOException ioe) {
                                throw new BuildException("could not change directory to curpwd");
                            }
                            scandir(file.getLink(),
                                    name + File.separator, fast);
                        } else {
                            try {
                                file.getClient().changeWorkingDirectory(file.curpwd);
                            } catch (IOException ioe) {
                                throw new BuildException("could not change directory to curpwd");
                            }
                            scandir(file.getName(),
                                    name + File.separator, fast);
                        }
                    }
                    dirsIncluded.addElement(name);
                } else {
                    dirsExcluded.addElement(name);
                    if (fast && couldHoldIncluded(name)) {
                        try {
                            file.getClient().changeWorkingDirectory(file.curpwd);
                        } catch (IOException ioe) {
                            throw new BuildException("could not change directory to curpwd");
                        }
                        scandir(file.getName(),
                                name + File.separator, fast);
                    }
                }
            }
        }

        /**
         * temporary table to speed up the various scanning methods below
         *
         * @since Ant 1.6
         */
        private Map<String, FTPFile[]> fileListMap = new HashMap<>();

        /**
         * List of all scanned directories.
         *
         * @since Ant 1.6
         */

        private Map<String, FTPFileProxy> scannedDirs = new HashMap<>();

        /**
         * Has the directory with the given path relative to the base
         * directory already been scanned?
         *
         * @since Ant 1.6
         */
        private boolean hasBeenScanned(String vpath) {
            return scannedDirs.containsKey(vpath);
        }

        /**
         * Clear internal caches.
         *
         * @since Ant 1.6
         */
        private void clearCaches() {
            fileListMap.clear();
            scannedDirs.clear();
        }

        /**
         * list the files present in one directory.
         * @param directory full path on the remote side
         * @param changedir if true change to directory directory before listing
         * @return array of FTPFile
         */
        public FTPFile[] listFiles(String directory, boolean changedir) {
            //task.log("listing files in directory " + directory, Project.MSG_DEBUG);
            String currentPath = directory;
            if (changedir) {
                try {
                    if (!ftp.changeWorkingDirectory(directory)) {
                        return null;
                    }
                    currentPath = ftp.printWorkingDirectory();
                } catch (IOException ioe) {
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