001package org.apache.maven.cli.logging;
002
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,
015 * software distributed under the License is distributed on an
016 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
017 * KIND, either express or implied.  See the License for the
018 * specific language governing permissions and limitations
019 * under the License.
020 */
021
022import java.io.IOException;
023import java.net.URL;
024import java.util.Enumeration;
025import java.util.Properties;
026
027import org.codehaus.plexus.util.PropertyUtils;
028import org.slf4j.ILoggerFactory;
029
030/**
031 * Slf4jConfiguration factory, loading implementations from <code>META-INF/maven/slf4j-configuration.properties</code>
032 * configuration files in class loader: key is the class name of the ILoggerFactory, value is the class name of
033 * the corresponding Slf4jConfiguration.
034 *
035 * @author Hervé Boutemy
036 * @since 3.1.0
037 */
038public class Slf4jConfigurationFactory
039{
040    public static final String RESOURCE = "META-INF/maven/slf4j-configuration.properties";
041
042    public static Slf4jConfiguration getConfiguration( ILoggerFactory loggerFactory )
043    {
044        try
045        {
046            Enumeration<URL> resources = Slf4jConfigurationFactory.class.getClassLoader().getResources( RESOURCE );
047
048            String key = loggerFactory.getClass().getCanonicalName();
049
050            while ( resources.hasMoreElements() )
051            {
052                URL resource = resources.nextElement();
053
054                Properties conf = PropertyUtils.loadProperties( resource.openStream() );
055
056                String impl = conf.getProperty( key );
057
058                if ( impl != null )
059                {
060                    return (Slf4jConfiguration) Class.forName( impl ).newInstance();
061                }
062            }
063        }
064        catch ( IOException e )
065        {
066            e.printStackTrace();
067        }
068        catch ( InstantiationException e )
069        {
070            e.printStackTrace();
071        }
072        catch ( IllegalAccessException e )
073        {
074            e.printStackTrace();
075        }
076        catch ( ClassNotFoundException e )
077        {
078            e.printStackTrace();
079        }
080
081        return new BaseSlf4jConfiguration();
082    }
083}