org.apache.hadoop.hdfs.web.resources.EnumSetParam Maven / Gradle / Ivy
/**
* 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.hdfs.web.resources;
import java.util.Arrays;
import java.util.EnumSet;
import java.util.Iterator;
import org.apache.hadoop.util.StringUtils;
abstract class EnumSetParam>
extends Param, EnumSetParam.Domain> {
/** Convert an EnumSet to a string of comma separated values. */
static > String toString(EnumSet set) {
if (set == null || set.isEmpty()) {
return "";
} else {
final StringBuilder b = new StringBuilder();
final Iterator i = set.iterator();
b.append(i.next());
for(; i.hasNext(); ) {
b.append(',').append(i.next());
}
return b.toString();
}
}
static > EnumSet toEnumSet(final Class clazz,
final E[] values) {
final EnumSet set = EnumSet.noneOf(clazz);
set.addAll(Arrays.asList(values));
return set;
}
EnumSetParam(final Domain domain, final EnumSet value) {
super(domain, value);
}
@Override
public String toString() {
return getName() + "=" + toString(value);
}
/** @return the parameter value as a string */
@Override
public String getValueString() {
return toString(value);
}
/** The domain of the parameter. */
static final class Domain> extends Param.Domain> {
private final Class enumClass;
Domain(String name, final Class enumClass) {
super(name);
this.enumClass = enumClass;
}
@Override
public final String getDomain() {
return Arrays.asList(enumClass.getEnumConstants()).toString();
}
/** The string contains a comma separated values. */
@Override
final EnumSet parse(final String str) {
final EnumSet set = EnumSet.noneOf(enumClass);
if (!str.isEmpty()) {
for(int i, j = 0; j >= 0; ) {
i = j > 0 ? j + 1 : 0;
j = str.indexOf(',', i);
final String sub = j >= 0? str.substring(i, j): str.substring(i);
set.add(Enum.valueOf(enumClass, StringUtils.toUpperCase(sub.trim())));
}
}
return set;
}
}
}