001package org.eclipse.aether.internal.impl;
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 javax.inject.Inject;
023import javax.inject.Named;
024import javax.inject.Provider;
025import javax.inject.Singleton;
026
027import org.eclipse.aether.spi.log.LoggerFactory;
028import org.eclipse.aether.spi.log.NullLoggerFactory;
029
030/**
031 * Helps Sisu-based applications to pick the right logger factory depending on the classpath.
032 */
033@Named
034@Singleton
035public class LoggerFactoryProvider
036    implements Provider<LoggerFactory>
037{
038
039    @Inject
040    @Named( "slf4j" )
041    private Provider<LoggerFactory> slf4j;
042
043    public LoggerFactory get()
044    {
045        try
046        {
047            LoggerFactory factory = slf4j.get();
048            if ( factory != null )
049            {
050                return factory;
051            }
052        }
053        catch ( LinkageError e )
054        {
055            // fall through
056        }
057        catch ( RuntimeException e )
058        {
059            // fall through
060        }
061        return NullLoggerFactory.INSTANCE;
062    }
063
064}