1 //
2 // ========================================================================
3 // Copyright (c) 1995-2013 Mort Bay Consulting Pty. Ltd.
4 // ------------------------------------------------------------------------
5 // All rights reserved. This program and the accompanying materials
6 // are made available under the terms of the Eclipse Public License v1.0
7 // and Apache License v2.0 which accompanies this distribution.
8 //
9 // The Eclipse Public License is available at
10 // http://www.eclipse.org/legal/epl-v10.html
11 //
12 // The Apache License v2.0 is available at
13 // http://www.opensource.org/licenses/apache2.0.php
14 //
15 // You may elect to redistribute this code under either of these licenses.
16 // ========================================================================
17 //
18
19 package org.eclipse.jetty.util.log;
20
21
22 /* ------------------------------------------------------------ */
23 /** Abstract Logger.
24 * Manages the atomic registration of the logger by name.
25 */
26 public abstract class AbstractLogger implements Logger
27 {
28 public final Logger getLogger(String name)
29 {
30 if (isBlank(name))
31 return this;
32
33 final String basename = getName();
34 final String fullname = (isBlank(basename) || Log.getRootLogger()==this)?name:(basename + "." + name);
35
36 Logger logger = Log.getLoggers().get(fullname);
37 if (logger == null)
38 {
39 Logger newlog = newLogger(fullname);
40
41 logger = Log.getMutableLoggers().putIfAbsent(fullname,newlog);
42 if (logger == null)
43 logger=newlog;
44 }
45
46 return logger;
47 }
48
49
50 protected abstract Logger newLogger(String fullname);
51
52 /**
53 * A more robust form of name blank test. Will return true for null names, and names that have only whitespace
54 *
55 * @param name
56 * the name to test
57 * @return true for null or blank name, false if any non-whitespace character is found.
58 */
59 private static boolean isBlank(String name)
60 {
61 if (name == null)
62 {
63 return true;
64 }
65 int size = name.length();
66 char c;
67 for (int i = 0; i < size; i++)
68 {
69 c = name.charAt(i);
70 if (!Character.isWhitespace(c))
71 {
72 return false;
73 }
74 }
75 return true;
76 }
77 }