/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.apache.commons.vfs.example; import org.apache.commons.vfs.FileContent; import org.apache.commons.vfs.FileObject; import org.apache.commons.vfs.FileSystemException; import org.apache.commons.vfs.FileSystemManager; import org.apache.commons.vfs.FileType; import org.apache.commons.vfs.FileUtil; import org.apache.commons.vfs.Selectors; import org.apache.commons.vfs.VFS; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.text.DateFormat; import java.util.ArrayList; import java.util.Date; import java.util.StringTokenizer; /** * A simple command-line shell for performing file operations. * * @author <a href="mailto:adammurdoch@apache.org">Adam Murdoch</a> * @author Gary D. Gregory * @version $Id:Shell.java 232419 2005-08-13 07:23:40 +0200 (Sa, 13 Aug 2005) imario $ */ public class Shell { private static final String CVS_ID = "$Id:Shell.java 232419 2005-08-13 07:23:40 +0200 (Sa, 13 Aug 2005) imario $"; private final FileSystemManager mgr; private FileObject cwd; private BufferedReader reader; public static void main(final String[] args) { try { (new Shell()).go(); } catch (Exception e) { e.printStackTrace(); System.exit(1); } System.exit(0); } private Shell() throws FileSystemException { mgr = VFS.getManager(); cwd = mgr.resolveFile(System.getProperty("user.dir")); reader = new BufferedReader(new InputStreamReader(System.in)); } private void go() throws Exception { System.out.println("VFS Shell [" + CVS_ID + "]"); while (true) { final String[] cmd = nextCommand(); if (cmd == null) { return; } if (cmd.length == 0) { continue; } final String cmdName = cmd[0]; if (cmdName.equalsIgnoreCase("exit") || cmdName.equalsIgnoreCase("quit")) { return; } try { handleCommand(cmd); } catch (final Exception e) { System.err.println("Command failed:"); e.printStackTrace(System.err); } } } /** * Handles a command. */ private void handleCommand(final String[] cmd) throws Exception { final String cmdName = cmd[0]; if (cmdName.equalsIgnoreCase("cat")) { cat(cmd); } else if (cmdName.equalsIgnoreCase("cd")) { cd(cmd); } else if (cmdName.equalsIgnoreCase("cp")) { cp(cmd); } else if (cmdName.equalsIgnoreCase("help")) { help(); } else if (cmdName.equalsIgnoreCase("ls")) { ls(cmd); } else if (cmdName.equalsIgnoreCase("pwd")) { pwd(); } else if (cmdName.equalsIgnoreCase("rm")) { rm(cmd); } else if (cmdName.equalsIgnoreCase("touch")) { touch(cmd); } else { System.err.println("Unknown command \"" + cmdName + "\"."); } } /** * Does a 'help' command. */ private void help() { System.out.println("Commands:"); System.out.println("cat <file> Displays the contents of a file."); System.out.println("cd [folder] Changes current folder."); System.out.println("cp <src> <dest> Copies a file or folder."); System.out.println("help Shows this message."); System.out.println("ls [-R] [path] Lists contents of a file or folder."); System.out.println("pwd Displays current folder."); System.out.println("rm <path> Deletes a file or folder."); System.out.println("touch <path> Sets the last-modified time of a file."); System.out.println("exit Exits this program."); System.out.println("quit Exits this program."); } /** * Does an 'rm' command. */ private void rm(final String[] cmd) throws Exception { if (cmd.length < 2) { throw new Exception("USAGE: rm <path>"); } final FileObject file = mgr.resolveFile(cwd, cmd[1]); file.delete(Selectors.SELECT_SELF); } /** * Does a 'cp' command. */ private void cp(final String[] cmd) throws Exception { if (cmd.length < 3) { throw new Exception("USAGE: cp <src> <dest>"); } final FileObject src = mgr.resolveFile(cwd, cmd[1]); FileObject dest = mgr.resolveFile(cwd, cmd[2]); if (dest.exists() && dest.getType() == FileType.FOLDER) { dest = dest.resolveFile(src.getName().getBaseName()); } dest.copyFrom(src, Selectors.SELECT_ALL); } /** * Does a 'cat' command. */ private void cat(final String[] cmd) throws Exception { if (cmd.length < 2) { throw new Exception("USAGE: cat <path>"); } // Locate the file final FileObject file = mgr.resolveFile(cwd, cmd[1]); // Dump the contents to System.out FileUtil.writeContent(file, System.out); System.out.println(); } /** * Does a 'pwd' command. */ private void pwd() { System.out.println("Current folder is " + cwd.getName()); } /** * Does a 'cd' command. * If the taget directory does not exist, a message is printed to <code>System.err</code>. */ private void cd(final String[] cmd) throws Exception { final String path; if (cmd.length > 1) { path = cmd[1]; } else { path = System.getProperty("user.home"); } // Locate and validate the folder FileObject tmp = mgr.resolveFile(cwd, path); if (tmp.exists()) { cwd = tmp; } else { System.out.println("Folder does not exist: " + tmp.getName()); } System.out.println("Current folder is " + cwd.getName()); } /** * Does an 'ls' command. */ private void ls(final String[] cmd) throws FileSystemException { int pos = 1; final boolean recursive; if (cmd.length > pos && cmd[pos].equals("-R")) { recursive = true; pos++; } else { recursive = false; } final FileObject file; if (cmd.length > pos) { file = mgr.resolveFile(cwd, cmd[pos]); } else { file = cwd; } if (file.getType() == FileType.FOLDER) { // List the contents System.out.println("Contents of " + file.getName()); listChildren(file, recursive, ""); } else { // Stat the file System.out.println(file.getName()); final FileContent content = file.getContent(); System.out.println("Size: " + content.getSize() + " bytes."); final DateFormat dateFormat = DateFormat.getDateTimeInstance(DateFormat.MEDIUM, DateFormat.MEDIUM); final String lastMod = dateFormat.format(new Date(content.getLastModifiedTime())); System.out.println("Last modified: " + lastMod); } } /** * Does a 'touch' command. */ private void touch(final String[] cmd) throws Exception { if (cmd.length < 2) { throw new Exception("USAGE: touch <path>"); } final FileObject file = mgr.resolveFile(cwd, cmd[1]); if (!file.exists()) { file.createFile(); } file.getContent().setLastModifiedTime(System.currentTimeMillis()); } /** * Lists the children of a folder. */ private void listChildren(final FileObject dir, final boolean recursive, final String prefix) throws FileSystemException { final FileObject[] children = dir.getChildren(); for (int i = 0; i < children.length; i++) { final FileObject child = children[i]; System.out.print(prefix); System.out.print(child.getName().getBaseName()); if (child.getType() == FileType.FOLDER) { System.out.println("/"); if (recursive) { listChildren(child, recursive, prefix + " "); } } else { System.out.println(); } } } /** * Returns the next command, split into tokens. */ private String[] nextCommand() throws IOException { System.out.print("> "); final String line = reader.readLine(); if (line == null) { return null; } final ArrayList cmd = new ArrayList(); final StringTokenizer tokens = new StringTokenizer(line); while (tokens.hasMoreTokens()) { cmd.add(tokens.nextToken()); } return (String[]) cmd.toArray(new String[cmd.size()]); } }