Java tutorial
/** * Copyright 2014, 2015, 2016, 2017 TAIN, Inc. all rights reserved. * * Licensed under the GNU GENERAL PUBLIC LICENSE, Version 3, 29 June 2007 (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.gnu.org/licenses/ * * 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. * * ----------------------------------------------------------------- * Copyright 2014, 2015, 2016, 2017 TAIN, Inc. * */ package tain.kr.test.vfs.v01; import java.io.BufferedReader; import java.io.File; import java.io.IOException; import java.io.InputStreamReader; import java.nio.charset.Charset; import java.text.DateFormat; import java.util.ArrayList; import java.util.Collection; import java.util.Date; import java.util.List; import java.util.StringTokenizer; import org.apache.commons.vfs2.Capability; import org.apache.commons.vfs2.FileContent; import org.apache.commons.vfs2.FileObject; import org.apache.commons.vfs2.FileSystemException; import org.apache.commons.vfs2.FileSystemManager; import org.apache.commons.vfs2.FileType; import org.apache.commons.vfs2.FileUtil; import org.apache.commons.vfs2.Selectors; import org.apache.commons.vfs2.VFS; import org.apache.commons.vfs2.operations.FileOperationProvider; import org.apache.log4j.Logger; /** * Code Templates > Comments > Types * * <PRE> * -. FileName : Shell.java * -. Package : tain.kr.test.vfs.v01 * -. Comment : * -. Author : taincokr * -. First Date : 2017. 4. 12. {time} * </PRE> * * @author taincokr * */ public final class Shell { private static boolean flag = true; private static final Logger log = Logger.getLogger(Shell.class); /////////////////////////////////////////////////////////////////////////////////////////////// private final FileSystemManager mgr; private FileObject cwd; private final BufferedReader reader; /////////////////////////////////////////////////////////////////////////////////////////////// /* * constructor */ private Shell() throws IOException { this.mgr = VFS.getManager(); this.cwd = mgr.toFileObject(new File(System.getProperty("user.dir"))); this.reader = new BufferedReader(new InputStreamReader(System.in, Charset.defaultCharset())); if (flag) { log.debug(">>>>> in class " + this.getClass().getSimpleName()); log.debug(">>>>> user.dir = " + System.getProperty("user.dir")); } } /////////////////////////////////////////////////////////////////////////////////////////////// private void go() throws Exception { System.out.println("VFS Shell " + getVersion(Shell.class)); 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") || cmdName.equals("?")) { 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 if (cmdName.equalsIgnoreCase("info")) { info(cmd); } else { System.err.println("Unknown command \"" + cmdName + "\" (Try 'help')."); } } /////////////////////////////////////////////////////////////////////////////////////////////// private void info(String[] cmd) throws Exception { if (cmd.length > 1) { info(cmd[1]); } else { System.out.println("Default manager: \"" + mgr.getClass().getName() + "\" " + "version " + getVersion(mgr.getClass())); String[] schemes = mgr.getSchemes(); List<String> virtual = new ArrayList<String>(); List<String> physical = new ArrayList<String>(); for (int i = 0; i < schemes.length; i++) { Collection<Capability> caps = mgr.getProviderCapabilities(schemes[i]); if (caps != null) { if (caps.contains(Capability.VIRTUAL) || caps.contains(Capability.COMPRESS) || caps.contains(Capability.DISPATCHER)) { virtual.add(schemes[i]); } else { physical.add(schemes[i]); } } } if (!physical.isEmpty()) { System.out.println(" Provider Schemes: " + physical); } if (!virtual.isEmpty()) { System.out.println(" Virtual Schemes: " + virtual); } } } /////////////////////////////////////////////////////////////////////////////////////////////// private void info(String scheme) throws Exception { System.out.println("Provider Info for scheme \"" + scheme + "\":"); Collection<Capability> caps; caps = mgr.getProviderCapabilities(scheme); if (caps != null && !caps.isEmpty()) { System.out.println(" capabilities: " + caps); } FileOperationProvider[] ops = mgr.getOperationProviders(scheme); if (ops != null && ops.length > 0) { System.out.println(" operations: " + ops); } } /////////////////////////////////////////////////////////////////////////////////////////////// /** * 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("info [scheme] Displays information about providers."); 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, 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 final 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 (final FileObject child : children) { 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<String> cmd = new ArrayList<String>(); final StringTokenizer tokens = new StringTokenizer(line); while (tokens.hasMoreTokens()) { cmd.add(tokens.nextToken()); } return cmd.toArray(new String[cmd.size()]); } /////////////////////////////////////////////////////////////////////////////////////////////// private static String getVersion(Class<?> cls) { try { return cls.getPackage().getImplementationVersion(); } catch (Exception ignored) { return "N/A"; } } /////////////////////////////////////////////////////////////////////////////////////////////// /////////////////////////////////////////////////////////////////////////////////////////////// /////////////////////////////////////////////////////////////////////////////////////////////// /////////////////////////////////////////////////////////////////////////////////////////////// /////////////////////////////////////////////////////////////////////////////////////////////// /////////////////////////////////////////////////////////////////////////////////////////////// /////////////////////////////////////////////////////////////////////////////////////////////// /////////////////////////////////////////////////////////////////////////////////////////////// /////////////////////////////////////////////////////////////////////////////////////////////// /////////////////////////////////////////////////////////////////////////////////////////////// /////////////////////////////////////////////////////////////////////////////////////////////// /////////////////////////////////////////////////////////////////////////////////////////////// /////////////////////////////////////////////////////////////////////////////////////////////// /////////////////////////////////////////////////////////////////////////////////////////////// /////////////////////////////////////////////////////////////////////////////////////////////// /////////////////////////////////////////////////////////////////////////////////////////////// /////////////////////////////////////////////////////////////////////////////////////////////// /////////////////////////////////////////////////////////////////////////////////////////////// /////////////////////////////////////////////////////////////////////////////////////////////// /////////////////////////////////////////////////////////////////////////////////////////////// /////////////////////////////////////////////////////////////////////////////////////////////// /////////////////////////////////////////////////////////////////////////////////////////////// /////////////////////////////////////////////////////////////////////////////////////////////// /////////////////////////////////////////////////////////////////////////////////////////////// /////////////////////////////////////////////////////////////////////////////////////////////// /////////////////////////////////////////////////////////////////////////////////////////////// /////////////////////////////////////////////////////////////////////////////////////////////// /////////////////////////////////////////////////////////////////////////////////////////////// /////////////////////////////////////////////////////////////////////////////////////////////// /////////////////////////////////////////////////////////////////////////////////////////////// /////////////////////////////////////////////////////////////////////////////////////////////// /////////////////////////////////////////////////////////////////////////////////////////////// /////////////////////////////////////////////////////////////////////////////////////////////// /* * static test method */ private static void test01(String[] args) throws Exception { if (flag) { /* * begin */ new Shell().go(); } } /* * main method */ public static void main(String[] args) throws Exception { if (flag) log.debug(">>>>> " + new Object() { }.getClass().getEnclosingClass().getName()); if (flag) test01(args); } }