001 /*
002 * Util.java
003 *
004 * Licensed to the Apache Software Foundation (ASF) under one
005 * or more contributor license agreements. See the NOTICE file
006 * distributed with this work for additional information
007 * regarding copyright ownership. The ASF licenses this file
008 * to you under the Apache License, Version 2.0 (the
009 * "License"); you may not use this file except in compliance
010 * with the License. You may obtain a copy of the License at
011 *
012 * http://www.apache.org/licenses/LICENSE-2.0
013 *
014 * Unless required by applicable law or agreed to in writing, software
015 * distributed under the License is distributed on an "AS IS" BASIS,
016 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
017 * See the License for the specific language governing permissions and
018 * limitations under the License.
019 */
020
021
022 package org.apache.hadoop.metrics.spi;
023
024 import java.net.InetSocketAddress;
025 import java.net.SocketAddress;
026 import java.util.ArrayList;
027 import java.util.List;
028
029 import org.apache.hadoop.classification.InterfaceAudience;
030 import org.apache.hadoop.classification.InterfaceStability;
031 import org.apache.hadoop.net.NetUtils;
032
033 /**
034 * Static utility methods
035 */
036 @InterfaceAudience.Public
037 @InterfaceStability.Evolving
038 public class Util {
039
040 /**
041 * This class is not intended to be instantiated
042 */
043 private Util() {}
044
045 /**
046 * Parses a space and/or comma separated sequence of server specifications
047 * of the form <i>hostname</i> or <i>hostname:port</i>. If
048 * the specs string is null, defaults to localhost:defaultPort.
049 *
050 * @return a list of InetSocketAddress objects.
051 */
052 public static List<InetSocketAddress> parse(String specs, int defaultPort) {
053 List<InetSocketAddress> result = new ArrayList<InetSocketAddress>(1);
054 if (specs == null) {
055 result.add(new InetSocketAddress("localhost", defaultPort));
056 }
057 else {
058 String[] specStrings = specs.split("[ ,]+");
059 for (String specString : specStrings) {
060 result.add(NetUtils.createSocketAddr(specString, defaultPort));
061 }
062 }
063 return result;
064 }
065
066 }