1 2 /* 3 * ==================================================================== 4 * The Apache Software License, Version 1.1 5 * 6 * Copyright (c) 2002 The Apache Software Foundation. All rights 7 * reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in 18 * the documentation and/or other materials provided with the 19 * distribution. 20 * 21 * 3. The end-user documentation included with the redistribution, 22 * if any, must include the following acknowledgment: 23 * "This product includes software developed by the 24 * Apache Software Foundation (http://www.apache.org/)." 25 * Alternately, this acknowledgment may appear in the software itself, 26 * if and wherever such third-party acknowledgments normally appear. 27 * 28 * 4. The names "Apache" and "Apache Software Foundation" and 29 * "Apache POI" must not be used to endorse or promote products 30 * derived from this software without prior written permission. For 31 * written permission, please contact apache@apache.org. 32 * 33 * 5. Products derived from this software may not be called "Apache", 34 * "Apache POI", nor may "Apache" appear in their name, without 35 * prior written permission of the Apache Software Foundation. 36 * 37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED 38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 40 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR 41 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 42 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 43 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 44 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 45 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 46 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 47 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 48 * SUCH DAMAGE. 49 * ==================================================================== 50 * 51 * This software consists of voluntary contributions made by many 52 * individuals on behalf of the Apache Software Foundation. For more 53 * information on the Apache Software Foundation, please see 54 * <http://www.apache.org/>. 55 */ 56 package org.apache.poi.util; 57 58 import java.io.FileInputStream; 59 import java.io.IOException; 60 61 import java.util.*; 62 63 /** 64 * Provides logging without clients having to mess with 65 * configuration/initialization. 66 * 67 * @author Andrew C. Oliver (acoliver at apache dot org) 68 * @author Marc Johnson (mjohnson at apache dot org) 69 * @author Nicola Ken Barozzi (nicolaken at apache.org) 70 */ 71 72 public class POILogFactory 73 { 74 75 // map of POILogger instances, with classes as keys 76 private static Map _loggers = new HashMap();; 77 78 79 /** 80 * construct a POILogFactory. 81 */ 82 83 private POILogFactory() 84 { 85 } 86 87 /** 88 * Get a logger, based on a class name 89 * 90 * @param theclass the class whose name defines the log 91 * 92 * @return a POILogger for the specified class 93 */ 94 95 public static POILogger getLogger(final Class theclass) 96 { 97 return getLogger(theclass.getName()); 98 } 99 100 /** 101 * Get a logger, based on a String 102 * 103 * @param cat the String that defines the log 104 * 105 * @return a POILogger for the specified class 106 */ 107 108 public static POILogger getLogger(final String cat) 109 { 110 POILogger logger = null; 111 112 if (_loggers.containsKey(cat)) 113 { 114 logger = ( POILogger ) _loggers.get(cat); 115 } 116 else 117 { 118 try{ 119 String loggerClassName = System.getProperty("org.apache.poi.util.POILogger"); 120 Class loggerClass = Class.forName(loggerClassName); 121 logger = ( POILogger ) loggerClass.newInstance(); 122 } 123 catch(Exception e){ 124 125 logger = new NullLogger(); 126 } 127 128 logger.initialize(cat); 129 130 _loggers.put(cat, logger); 131 } 132 return logger; 133 } 134 135 } // end public class POILogFactory 136