| /** |
| * 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; |
| |
| import java.io.IOException; |
| import java.util.EnumSet; |
| |
| import org.apache.hadoop.HadoopIllegalArgumentException; |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| |
| @InterfaceAudience.Public |
| @InterfaceStability.Stable |
| public enum XAttrSetFlag { |
| /** |
| * Create a new xattr. |
| * If the xattr exists already, exception will be thrown. |
| */ |
| CREATE((short) 0x01), |
| |
| /** |
| * Replace a existing xattr. |
| * If the xattr does not exist, exception will be thrown. |
| */ |
| REPLACE((short) 0x02); |
| |
| private final short flag; |
| |
| private XAttrSetFlag(short flag) { |
| this.flag = flag; |
| } |
| |
| short getFlag() { |
| return flag; |
| } |
| |
| public static void validate(String xAttrName, boolean xAttrExists, |
| EnumSet<XAttrSetFlag> flag) throws IOException { |
| if (flag == null || flag.isEmpty()) { |
| throw new HadoopIllegalArgumentException("A flag must be specified."); |
| } |
| |
| if (xAttrExists) { |
| if (!flag.contains(REPLACE)) { |
| throw new IOException("XAttr: " + xAttrName + |
| " already exists. The REPLACE flag must be specified."); |
| } |
| } else { |
| if (!flag.contains(CREATE)) { |
| throw new IOException("XAttr: " + xAttrName + |
| " does not exist. The CREATE flag must be specified."); |
| } |
| } |
| } |
| } |