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
022package org.apache.hadoop.metrics.spi;
023
024import java.net.InetSocketAddress;
025import java.util.ArrayList;
026import java.util.List;
027
028import org.apache.hadoop.classification.InterfaceAudience;
029import org.apache.hadoop.classification.InterfaceStability;
030import org.apache.hadoop.net.NetUtils;
031
032/**
033 * Static utility methods
034 */
035@InterfaceAudience.Public
036@InterfaceStability.Evolving
037public class Util {
038    
039  /**
040   * This class is not intended to be instantiated
041   */
042  private Util() {}
043    
044  /**
045   * Parses a space and/or comma separated sequence of server specifications
046   * of the form <i>hostname</i> or <i>hostname:port</i>.  If 
047   * the specs string is null, defaults to localhost:defaultPort.
048   * 
049   * @return a list of InetSocketAddress objects.
050   */
051  public static List<InetSocketAddress> parse(String specs, int defaultPort) {
052    List<InetSocketAddress> result = new ArrayList<InetSocketAddress>(1);
053    if (specs == null) {
054      result.add(new InetSocketAddress("localhost", defaultPort));
055    }
056    else {
057      String[] specStrings = specs.split("[ ,]+");
058      for (String specString : specStrings) {
059        result.add(NetUtils.createSocketAddr(specString, defaultPort));
060      }
061    }
062    return result;
063  }
064    
065}