1 /*
2  * Util.java
3  *
4  * Licensed to the Apache Software Foundation (ASF) under one
5  * or more contributor license agreements.  See the NOTICE file
6  * distributed with this work for additional information
7  * regarding copyright ownership.  The ASF licenses this file
8  * to you under the Apache License, Version 2.0 (the
9  * "License"); you may not use this file except in compliance
10  * with the License.  You may obtain a copy of the License at
11  *
12  *     http://www.apache.org/licenses/LICENSE-2.0
13  *
14  * Unless required by applicable law or agreed to in writing, software
15  * distributed under the License is distributed on an "AS IS" BASIS,
16  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17  * See the License for the specific language governing permissions and
18  * limitations under the License.
19  */
20 
21 
22 package org.apache.hadoop.metrics.spi;
23 
24 import java.net.InetSocketAddress;
25 import java.net.SocketAddress;
26 import java.util.ArrayList;
27 import java.util.List;
28 
29 import org.apache.hadoop.classification.InterfaceAudience;
30 import org.apache.hadoop.classification.InterfaceStability;
31 
32 /**
33  * Static utility methods
34  */
35 @InterfaceAudience.Public
36 @InterfaceStability.Evolving
37 public class Util {
38 
39   /**
40    * This class is not intended to be instantiated
41    */
Util()42   private Util() {}
43 
44   /**
45    * Parses a space and/or comma separated sequence of server specifications
46    * of the form <i>hostname</i> or <i>hostname:port</i>.  If
47    * the specs string is null, defaults to localhost:defaultPort.
48    *
49    * @return a list of InetSocketAddress objects.
50    */
parse(String specs, int defaultPort)51   public static List<InetSocketAddress> parse(String specs, int defaultPort) {
52     List<InetSocketAddress> result = new ArrayList<InetSocketAddress>(1);
53     if (specs == null) {
54       result.add(new InetSocketAddress("localhost", defaultPort));
55     }
56     else {
57       String[] specStrings = specs.split("[ ,]+");
58       for (String specString : specStrings) {
59         int colon = specString.indexOf(':');
60         if (colon < 0 || colon == specString.length() - 1) {
61           result.add(new InetSocketAddress(specString, defaultPort));
62         } else {
63           String hostname = specString.substring(0, colon);
64           int port = Integer.parseInt(specString.substring(colon+1));
65           result.add(new InetSocketAddress(hostname, port));
66         }
67       }
68     }
69     return result;
70   }
71 
72 }
73