org.apache.hadoop.fs.shell.Touchz Maven / Gradle / Ivy
/**
* 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 = " ...";
public static final String DESCRIPTION =
"Creates a file of zero length " +
"at with current time as the timestamp of that . " +
"An error is returned if the file exists with non-zero length\n";
@Override
protected void processOptions(LinkedList 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();
}
}
}