| /** |
| * 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; |
| |
| /** |
| * Parse umask value provided as a string, either in octal or symbolic |
| * format and return it as a short value. Umask values are slightly |
| * different from standard modes as they cannot specify sticky bit |
| * or X. |
| * |
| */ |
| @InterfaceAudience.Private |
| @InterfaceStability.Unstable |
| class UmaskParser extends PermissionParser { |
| private static Pattern chmodOctalPattern = |
| Pattern.compile("^\\s*[+]?()([0-7]{3})\\s*$"); // no leading 1 for sticky bit |
| private static Pattern umaskSymbolicPattern = /* not allow X or t */ |
| Pattern.compile("\\G\\s*([ugoa]*)([+=-]+)([rwx]*)([,\\s]*)\\s*"); |
| final short umaskMode; |
| |
| public UmaskParser(String modeStr) throws IllegalArgumentException { |
| super(modeStr, umaskSymbolicPattern, chmodOctalPattern); |
| |
| umaskMode = (short)combineModes(0, false); |
| } |
| |
| /** |
| * To be used for file/directory creation only. Symbolic umask is applied |
| * relative to file mode creation mask; the permission op characters '+' |
| * results in clearing the corresponding bit in the mask, '-' results in bits |
| * for indicated permission to be set in the mask. |
| * |
| * For octal umask, the specified bits are set in the file mode creation mask. |
| * |
| * @return umask |
| */ |
| public short getUMask() { |
| if (symbolic) { |
| // Return the complement of octal equivalent of umask that was computed |
| return (short) (~umaskMode & 0777); |
| } |
| return umaskMode; |
| } |
| } |