hadoop XAttrSetFlag 源码
haddop XAttrSetFlag 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/XAttrSetFlag.java
/**
* 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.");
}
}
}
}
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