src/main/org/apache/tools/ant/taskdefs/optional/net/FTP.java [265:408]:
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        @Override
        public String getPath() {
            return name;
        }


        /**
         * FTP files are stored as absolute paths
         * @return true
         */
        @Override
        public boolean isAbsolute() {
            return true;
        }


        /* (non-Javadoc)
         * @see java.io.File#isDirectory()
         */
        @Override
        public boolean isDirectory() {
            return file == null;
        }


        /* (non-Javadoc)
         * @see java.io.File#isFile()
         */
        @Override
        public boolean isFile() {
            return file != null;
        }


        /**
         * FTP files cannot be hidden
         *
         * @return  false
         */
        @Override
        public boolean isHidden() {
            return false;
        }


        /* (non-Javadoc)
         * @see java.io.File#lastModified()
         */
        @Override
        public long lastModified() {
            if (file != null) {
                return file.getTimestamp().getTimeInMillis();
            }
            return 0;
        }


        /* (non-Javadoc)
         * @see java.io.File#length()
         */
        @Override
        public long length() {
            if (file != null) {
                return file.getSize();
            }
            return 0;
        }
    }

    /**
     * internal class allowing to read the contents of a remote file system
     * using the FTP protocol
     * used in particular for ftp get operations
     * differences with DirectoryScanner
     * "" (the root of the fileset) is never included in the included directories
     * followSymlinks defaults to false
     */
    protected class FTPDirectoryScanner extends DirectoryScanner {
        // CheckStyle:VisibilityModifier OFF - bc
        protected FTPClient ftp = null;
        // CheckStyle:VisibilityModifier ON

        private String rootPath = null;

        /**
         * since ant 1.6
         * this flag should be set to true on UNIX and can save scanning time
         */
        private boolean remoteSystemCaseSensitive = false;
        private boolean remoteSensitivityChecked = false;

        /**
         * constructor
         * @param ftp  ftpclient object
         */
        public FTPDirectoryScanner(FTPClient ftp) {
            super();
            this.ftp = ftp;
            this.setFollowSymlinks(false);
        }


        /**
         * scans the remote directory,
         * storing internally the included files, directories, ...
         */
        @Override
        public void scan() {
            if (includes == null) {
                // No includes supplied, so set it to 'matches all'
                includes = new String[1];
                includes[0] = "**";
            }
            if (excludes == null) {
                excludes = new String[0];
            }

            filesIncluded = new VectorSet<>();
            filesNotIncluded = new Vector<>();
            filesExcluded = new VectorSet<>();
            dirsIncluded = new VectorSet<>();
            dirsNotIncluded = new Vector<>();
            dirsExcluded = new VectorSet<>();

            try {
                String cwd = ftp.printWorkingDirectory();
                // always start from the current ftp working dir
                forceRemoteSensitivityCheck();

                checkIncludePatterns();
                clearCaches();
                ftp.changeWorkingDirectory(cwd);
            } catch (IOException e) {
                throw new BuildException("Unable to scan FTP server: ", e);
            }
        }


        /**
         * this routine is actually checking all the include patterns in
         * order to avoid scanning everything under base dir
         * @since ant1.6
         */
        private void checkIncludePatterns() {
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src/main/org/apache/tools/ant/taskdefs/optional/net/FTPTaskMirrorImpl.java [156:291]:
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        @Override
        public String getPath() {
            return name;
        }

        /**
         * FTP files are stored as absolute paths
         * @return true
         */
        @Override
        public boolean isAbsolute() {
            return true;
        }

        /* (non-Javadoc)
         * @see java.io.File#isDirectory()
         */
        @Override
        public boolean isDirectory() {
            return file == null;
        }

        /* (non-Javadoc)
         * @see java.io.File#isFile()
         */
        @Override
        public boolean isFile() {
            return file != null;
        }

        /**
         * FTP files cannot be hidden
         *
         * @return  false
         */
        @Override
        public boolean isHidden() {
            return false;
        }

        /* (non-Javadoc)
         * @see java.io.File#lastModified()
         */
        @Override
        public long lastModified() {
            if (file != null) {
                return file.getTimestamp().getTimeInMillis();
            }
            return 0;
        }

        /* (non-Javadoc)
         * @see java.io.File#length()
         */
        @Override
        public long length() {
            if (file != null) {
                return file.getSize();
            }
            return 0;
        }
    }

    /**
     * internal class allowing to read the contents of a remote file system
     * using the FTP protocol
     * used in particular for ftp get operations
     * differences with DirectoryScanner
     * "" (the root of the fileset) is never included in the included directories
     * followSymlinks defaults to false
     */
    protected class FTPDirectoryScanner extends DirectoryScanner {
        // CheckStyle:VisibilityModifier OFF - bc
        protected FTPClient ftp = null;
        // CheckStyle:VisibilityModifier ON

        private String rootPath = null;

        /**
         * since ant 1.6
         * this flag should be set to true on UNIX and can save scanning time
         */
        private boolean remoteSystemCaseSensitive = false;
        private boolean remoteSensitivityChecked = false;

        /**
         * constructor
         * @param ftp  ftpclient object
         */
        public FTPDirectoryScanner(FTPClient ftp) {
            super();
            this.ftp = ftp;
            this.setFollowSymlinks(false);
        }

        /**
         * scans the remote directory,
         * storing internally the included files, directories, ...
         */
        @Override
        public void scan() {
            if (includes == null) {
                // No includes supplied, so set it to 'matches all'
                includes = new String[1];
                includes[0] = "**";
            }
            if (excludes == null) {
                excludes = new String[0];
            }

            filesIncluded = new VectorSet<>();
            filesNotIncluded = new Vector<>();
            filesExcluded = new VectorSet<>();
            dirsIncluded = new VectorSet<>();
            dirsNotIncluded = new Vector<>();
            dirsExcluded = new VectorSet<>();

            try {
                String cwd = ftp.printWorkingDirectory();
                // always start from the current ftp working dir
                forceRemoteSensitivityCheck();

                checkIncludePatterns();
                clearCaches();
                ftp.changeWorkingDirectory(cwd);
            } catch (IOException e) {
                throw new BuildException("Unable to scan FTP server: ", e);
            }
        }

        /**
         * this routine is actually checking all the include patterns in
         * order to avoid scanning everything under base dir
         * @since ant1.6
         */
        private void checkIncludePatterns() {
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