hadoop EnumSetParam 源码
haddop EnumSetParam 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/java/org/apache/hadoop/lib/wsrs/EnumSetParam.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.lib.wsrs;
import java.util.Arrays;
import java.util.EnumSet;
import java.util.Iterator;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.util.StringUtils;
@InterfaceAudience.Private
public abstract class EnumSetParam<E extends Enum<E>> extends Param<EnumSet<E>> {
Class<E> klass;
public EnumSetParam(String name, Class<E> e, EnumSet<E> defaultValue) {
super(name, defaultValue);
klass = e;
}
@Override
protected EnumSet<E> parse(String str) throws Exception {
final EnumSet<E> set = EnumSet.noneOf(klass);
if (!str.isEmpty()) {
for (String sub : str.split(",")) {
set.add(Enum.valueOf(klass, StringUtils.toUpperCase(sub.trim())));
}
}
return set;
}
@Override
protected String getDomain() {
return Arrays.asList(klass.getEnumConstants()).toString();
}
/** Convert an EnumSet to a string of comma separated values. */
public static <E extends Enum<E>> String toString(EnumSet<E> set) {
if (set == null || set.isEmpty()) {
return "";
} else {
final StringBuilder b = new StringBuilder();
final Iterator<E> i = set.iterator();
b.append(i.next());
while (i.hasNext()) {
b.append(',').append(i.next());
}
return b.toString();
}
}
@Override
public String toString() {
return getName() + "=" + toString(value);
}
}
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