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.apache.isis.tool.mavenplugin.util;
020
021import java.util.Enumeration;
022
023public final class Log4j {
024    
025    private Log4j(){}
026
027    public static void configureIfRequired() {
028        if(isConfigured()) return;
029        org.apache.log4j.BasicConfigurator.configure();
030        org.apache.log4j.LogManager.getRootLogger().setLevel(org.apache.log4j.Level.INFO);
031    }
032    
033    private static boolean isConfigured() {
034        Enumeration<?> appenders = org.apache.log4j.LogManager.getRootLogger().getAllAppenders();
035        if (appenders.hasMoreElements()) {
036            return true;
037        } 
038        Enumeration<?> loggers = org.apache.log4j.LogManager.getCurrentLoggers();
039        while (loggers.hasMoreElements()) {
040            org.apache.log4j.Logger c = (org.apache.log4j.Logger) loggers.nextElement();
041            if (c.getAllAppenders().hasMoreElements())
042                return true;
043        }
044        return false;
045    }
046
047
048}