001 /**
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017
018 package org.apache.geronimo.system.logging.log4j;
019
020 import java.io.BufferedReader;
021 import java.io.IOException;
022 import java.io.InputStreamReader;
023 import java.io.FileNotFoundException;
024 import java.net.URL;
025 import java.net.URLConnection;
026
027 import org.apache.commons.logging.Log;
028 import org.apache.commons.logging.LogFactory;
029 import org.apache.log4j.LogManager;
030 import org.apache.log4j.PropertyConfigurator;
031 import org.apache.log4j.spi.Configurator;
032 import org.apache.log4j.spi.LoggerRepository;
033 import org.apache.log4j.xml.DOMConfigurator;
034
035 /**
036 * Handles the details of configuring Log4j from a URL.
037 *
038 * @version $Rev: 706640 $ $Date: 2008-10-21 14:44:05 +0000 (Tue, 21 Oct 2008) $
039 */
040 public class URLConfigurator implements Configurator {
041 private static final Log log = LogFactory.getLog(URLConfigurator.class);
042
043 public static void configure(final URL url) {
044 new URLConfigurator().doConfigure(url, LogManager.getLoggerRepository());
045 }
046
047 private Configurator getConfigurator(final URL url) throws FileNotFoundException {
048 String contentType = null;
049
050 // Get the content type to see if it is XML or not
051 URLConnection connection = null;
052 try {
053 connection = url.openConnection();
054 contentType = connection.getContentType();
055 if (log.isTraceEnabled()) {
056 log.trace("Content type: " + contentType);
057 }
058 } catch (FileNotFoundException e) {
059 throw e;
060 } catch (IOException e) {
061 log.warn("Could not determine content type from URL; ignoring", e);
062 }
063 if (contentType != null) {
064 if (contentType.toLowerCase().endsWith("/xml")) {
065 return new DOMConfigurator();
066 }
067 }
068
069 // Check thr file name
070 String filename = url.getFile().toLowerCase();
071 if (filename.endsWith(".xml")) {
072 return new DOMConfigurator();
073 } else if (filename.endsWith(".properties")) {
074 return new PropertyConfigurator();
075 }
076
077 // Check for <?xml in content
078 if (connection != null) {
079 try {
080 BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
081 try {
082 String head = reader.readLine();
083 if (head.startsWith("<?xml")) {
084 return new DOMConfigurator();
085 }
086 } finally {
087 reader.close();
088 }
089 } catch (IOException e) {
090 log.warn("Failed to check content header; ignoring", e);
091 }
092 }
093
094 log.warn("Unable to determine content type, using property configurator");
095 return new PropertyConfigurator();
096 }
097
098 public void doConfigure(final URL url, final LoggerRepository repo) {
099 if (log.isDebugEnabled()) {
100 log.debug("Configuring from URL: " + url);
101 }
102
103 // Get the config delegate and target repository to config with
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 // Now actually configure Log4j
117 delegate.doConfigure(url, repo);
118 }
119 }