aether-impl/src/main/java/org/eclipse/aether/internal/impl/LoggerFactoryProvider.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
 *  http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.eclipse.aether.internal.impl;

import javax.inject.Inject;
import javax.inject.Named;
import javax.inject.Provider;
import javax.inject.Singleton;

import org.eclipse.aether.spi.log.LoggerFactory;
import org.eclipse.aether.spi.log.NullLoggerFactory;

/**
 * Helps Sisu-based applications to pick the right logger factory depending on the classpath.
 */
@Named
@Singleton
public class LoggerFactoryProvider
    implements Provider<LoggerFactory>
{

    @Inject
    @Named( "slf4j" )
    private Provider<LoggerFactory> slf4j;

    public LoggerFactory get()
    {
        try
        {
            LoggerFactory factory = slf4j.get();
            if ( factory != null )
            {
                return factory;
            }
        }
        catch ( LinkageError e )
        {
            // fall through
        }
        catch ( RuntimeException e )
        {
            // fall through
        }
        return NullLoggerFactory.INSTANCE;
    }

}