| /** |
| * 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.permission; |
| |
| import java.util.regex.Pattern; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| import org.apache.hadoop.fs.FileStatus; |
| |
| /** |
| * Parse a permission mode passed in from a chmod command and apply that |
| * mode against an existing file. |
| */ |
| @InterfaceAudience.Private |
| @InterfaceStability.Unstable |
| public class ChmodParser extends PermissionParser { |
| private static Pattern chmodOctalPattern = |
| Pattern.compile("^\\s*[+]?([01]?)([0-7]{3})\\s*$"); |
| private static Pattern chmodNormalPattern = |
| Pattern.compile("\\G\\s*([ugoa]*)([+=-]+)([rwxXt]+)([,\\s]*)\\s*"); |
| |
| public ChmodParser(String modeStr) throws IllegalArgumentException { |
| super(modeStr, chmodNormalPattern, chmodOctalPattern); |
| } |
| |
| /** |
| * Apply permission against specified file and determine what the |
| * new mode would be |
| * @param file File against which to apply mode |
| * @return File's new mode if applied. |
| */ |
| public short applyNewPermission(FileStatus file) { |
| FsPermission perms = file.getPermission(); |
| int existing = perms.toShort(); |
| boolean exeOk = file.isDirectory() || (existing & 0111) != 0; |
| |
| return (short)combineModes(existing, exeOk); |
| } |
| } |