1 /**
2 *
3 * Copyright 2003-2004 The Apache Software Foundation
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18 package org.apache.geronimo.system.logging.log4j;
19
20 import java.io.BufferedReader;
21 import java.io.IOException;
22 import java.io.InputStreamReader;
23 import java.io.FileNotFoundException;
24 import java.net.URL;
25 import java.net.URLConnection;
26
27 import org.apache.commons.logging.Log;
28 import org.apache.commons.logging.LogFactory;
29 import org.apache.log4j.LogManager;
30 import org.apache.log4j.PropertyConfigurator;
31 import org.apache.log4j.spi.Configurator;
32 import org.apache.log4j.spi.LoggerRepository;
33 import org.apache.log4j.xml.DOMConfigurator;
34
35 /**
36 * Handles the details of configuring Log4j from a URL.
37 *
38 * @version $Rev: 355877 $ $Date: 2005-12-10 18:48:27 -0800 (Sat, 10 Dec 2005) $
39 */
40 public class URLConfigurator implements Configurator {
41 private static final Log log = LogFactory.getLog(URLConfigurator.class);
42
43 public static void configure(final URL url) {
44 new URLConfigurator().doConfigure(url, LogManager.getLoggerRepository());
45 }
46
47 private Configurator getConfigurator(final URL url) throws FileNotFoundException {
48 String contentType = null;
49
50
51 URLConnection connection = null;
52 try {
53 connection = url.openConnection();
54 contentType = connection.getContentType();
55 if (log.isTraceEnabled()) {
56 log.trace("Content type: " + contentType);
57 }
58 } catch (FileNotFoundException e) {
59 throw e;
60 } catch (IOException e) {
61 log.warn("Could not determine content type from URL; ignoring", e);
62 }
63 if (contentType != null) {
64 if (contentType.toLowerCase().endsWith("/xml")) {
65 return new DOMConfigurator();
66 }
67 }
68
69
70 String filename = url.getFile().toLowerCase();
71 if (filename.endsWith(".xml")) {
72 return new DOMConfigurator();
73 } else if (filename.endsWith(".properties")) {
74 return new PropertyConfigurator();
75 }
76
77
78 if (connection != null) {
79 try {
80 BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
81 try {
82 String head = reader.readLine();
83 if (head.startsWith("<?xml")) {
84 return new DOMConfigurator();
85 }
86 } finally {
87 reader.close();
88 }
89 } catch (IOException e) {
90 log.warn("Failed to check content header; ignoring", e);
91 }
92 }
93
94 log.warn("Unable to determine content type, using property configurator");
95 return new PropertyConfigurator();
96 }
97
98 public void doConfigure(final URL url, final LoggerRepository repo) {
99 if (log.isDebugEnabled()) {
100 log.debug("Configuring from URL: " + url);
101 }
102
103
104 Configurator delegate = null;
105 try {
106 delegate = getConfigurator(url);
107 } catch (FileNotFoundException e) {
108 return;
109 }
110
111 if (log.isTraceEnabled()) {
112 log.trace("Configuring Log4j using configurator: " +
113 delegate + ", repository: " + repo);
114 }
115
116
117 delegate.doConfigure(url, repo);
118 }
119 }