| /* ==================================================================== |
| 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.apache.poi.util; |
| |
| /** |
| * An empty-implementation of the {@link POILogger}. |
| * |
| * This can be used to not log anything, however the suggested approach |
| * in production systems is to use the {@link CommonsLogger} and configure |
| * proper log-handling via Apache Commons Logging. |
| */ |
| @Internal |
| public class NullLogger implements POILogger { |
| @Override |
| public void initialize(final String cat) { |
| // do nothing |
| } |
| |
| /** |
| * Log a message |
| * |
| * @param level One of DEBUG, INFO, WARN, ERROR, FATAL |
| * @param obj1 The object to log. |
| */ |
| |
| @Override |
| public void _log(final int level, final Object obj1) { |
| // do nothing |
| } |
| |
| /** |
| * Log a message |
| * |
| * @param level One of DEBUG, INFO, WARN, ERROR, FATAL |
| * @param obj1 The object to log. This is converted to a string. |
| * @param exception An exception to be logged |
| */ |
| @Override |
| public void _log(int level, Object obj1, final Throwable exception) { |
| // do nothing |
| } |
| |
| /** |
| * Log a message. Lazily appends Object parameters together. |
| * If the last parameter is a {@link Throwable} it is logged specially. |
| * |
| * @param level One of DEBUG, INFO, WARN, ERROR, FATAL |
| * @param objs the objects to place in the message |
| */ |
| @Override |
| public void log(int level, Object... objs) { |
| // do nothing |
| } |
| |
| |
| /** |
| * Check if a logger is enabled to log at the specified level |
| * |
| * @param level One of DEBUG, INFO, WARN, ERROR, FATAL |
| */ |
| @Override |
| public boolean check(final int level) { |
| return false; |
| } |
| } |
| |