001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *   http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied.  See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 */
019package org.eclipse.aether.spi.log;
020
021/**
022 * A logger factory that disables any logging.
023 *
024 * @deprecated Use SLF4J instead
025 */
026@Deprecated
027public final class NullLoggerFactory implements LoggerFactory {
028
029    /**
030     * The singleton instance of this factory.
031     */
032    public static final LoggerFactory INSTANCE = new NullLoggerFactory();
033
034    /**
035     * The singleton logger used by this factory.
036     */
037    public static final Logger LOGGER = new NullLogger();
038
039    public Logger getLogger(String name) {
040        return LOGGER;
041    }
042
043    private NullLoggerFactory() {
044        // hide constructor
045    }
046
047    /**
048     * Gets a logger from the specified factory for the given class, falling back to a logger from this factory if the
049     * specified factory is {@code null} or fails to provide a logger.
050     *
051     * @param loggerFactory The logger factory from which to get the logger, may be {@code null}.
052     * @param type The class for which to get the logger, must not be {@code null}.
053     * @return The requested logger, never {@code null}.
054     */
055    public static Logger getSafeLogger(LoggerFactory loggerFactory, Class<?> type) {
056        if (loggerFactory == null) {
057            return LOGGER;
058        }
059        Logger logger = loggerFactory.getLogger(type.getName());
060        if (logger == null) {
061            return LOGGER;
062        }
063        return logger;
064    }
065}