| /** |
| * 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.hadoop.fs.shell; |
| |
| import java.io.IOException; |
| import java.util.LinkedList; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| import org.apache.hadoop.fs.PathIOException; |
| import org.apache.hadoop.fs.PathIsDirectoryException; |
| import org.apache.hadoop.fs.PathNotFoundException; |
| |
| /** |
| * Unix touch like commands |
| */ |
| @InterfaceAudience.Private |
| @InterfaceStability.Unstable |
| |
| class Touch extends FsCommand { |
| public static void registerCommands(CommandFactory factory) { |
| factory.addClass(Touchz.class, "-touchz"); |
| } |
| |
| /** |
| * (Re)create zero-length file at the specified path. |
| * This will be replaced by a more UNIX-like touch when files may be |
| * modified. |
| */ |
| public static class Touchz extends Touch { |
| public static final String NAME = "touchz"; |
| public static final String USAGE = "<path> ..."; |
| public static final String DESCRIPTION = |
| "Creates a file of zero length " + |
| "at <path> with current time as the timestamp of that <path>. " + |
| "An error is returned if the file exists with non-zero length\n"; |
| |
| @Override |
| protected void processOptions(LinkedList<String> args) { |
| CommandFormat cf = new CommandFormat(1, Integer.MAX_VALUE); |
| cf.parse(args); |
| } |
| |
| @Override |
| protected void processPath(PathData item) throws IOException { |
| if (item.stat.isDirectory()) { |
| // TODO: handle this |
| throw new PathIsDirectoryException(item.toString()); |
| } |
| if (item.stat.getLen() != 0) { |
| throw new PathIOException(item.toString(), "Not a zero-length file"); |
| } |
| touchz(item); |
| } |
| |
| @Override |
| protected void processNonexistentPath(PathData item) throws IOException { |
| if (!item.parentExists()) { |
| throw new PathNotFoundException(item.toString()); |
| } |
| touchz(item); |
| } |
| |
| private void touchz(PathData item) throws IOException { |
| item.fs.create(item.path).close(); |
| } |
| } |
| } |