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 org.codehaus.plexus.logging.Logger;
023import org.codehaus.plexus.logging.LoggerManager;
024import org.slf4j.ILoggerFactory;
025import org.slf4j.LoggerFactory;
026
027/**
028 * Use an SLF4J {@link org.slf4j.ILoggerFactory} as a backing for a Plexus
029 * {@link org.codehaus.plexus.logging.LoggerManager},
030 * ignoring Plexus logger API parts that are not classical and probably not really used.
031 *
032 * @author Jason van Zyl
033 * @since 3.1
034 */
035public class Slf4jLoggerManager
036    implements LoggerManager
037{
038
039    private ILoggerFactory loggerFactory;
040
041    public Slf4jLoggerManager()
042    {
043        loggerFactory = LoggerFactory.getILoggerFactory();
044    }
045
046    public Logger getLoggerForComponent( String role )
047    {
048        return new Slf4jLogger( loggerFactory.getLogger( role ) );
049    }
050
051    /**
052     * The logger name for a component with a non-null hint is <code>role.hint</code>.
053     * <b>Warning</b>: this does not conform to logger name as class name convention.
054     * (and what about <code>null</code> and <code>default</code> hint equivalence?)
055     */
056    public Logger getLoggerForComponent( String role, String hint )
057    {
058        return ( null == hint
059            ? getLoggerForComponent( role )
060            : new Slf4jLogger( loggerFactory.getLogger( role + '.' + hint ) ) );
061    }
062
063    //
064    // Trying to give loggers back is a bad idea. Ceki said so :-)
065    // notice to self: what was this method supposed to do?
066    //
067    /**
068     * <b>Warning</b>: ignored.
069     */
070    public void returnComponentLogger( String role )
071    {
072    }
073
074    /**
075     * <b>Warning</b>: ignored.
076     */
077    public void returnComponentLogger( String role, String hint )
078    {
079    }
080
081    /**
082     * <b>Warning</b>: ignored (always return <code>0</code>).
083     */
084    public int getThreshold()
085    {
086        return 0;
087    }
088
089    /**
090     * <b>Warning</b>: ignored.
091     */
092    public void setThreshold( int threshold )
093    {
094    }
095
096    /**
097     * <b>Warning</b>: ignored.
098     */
099    public void setThresholds( int threshold )
100    {
101    }
102
103    /**
104     * <b>Warning</b>: ignored (always return <code>0</code>).
105     */
106    public int getActiveLoggerCount()
107    {
108        return 0;
109    }
110
111}