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/* ====================================================================
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Licensed to the Apache Software Foundation (ASF) under one or more
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contributor license agreements. See the NOTICE file distributed with
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this work for additional information regarding copyright ownership.
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The ASF licenses this file to You under the Apache License, Version 2.0
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(the "License"); you may not use this file except in compliance with
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the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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==================================================================== */
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/* ================================================================
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* About NPOI
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* Author: Tony Qu
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* Author's email: tonyqus (at) gmail.com
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* Author's Blog: tonyqus.wordpress.com.cn (wp.tonyqus.cn)
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* HomePage: http://www.codeplex.com/npoi
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* Contributors:
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*
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* ==============================================================*/
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using System;
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using System.Collections.Generic;
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using System.Collections;
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using System.Text;
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using System.Reflection;
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using System.Configuration;
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namespace HH.WMS.Utils.NPOI.Util
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{
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public class POILogFactory
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{
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/**
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* Map of POILogger instances, with classes as keys
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*/
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private static Hashtable _loggers = new Hashtable();
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/**
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* A common instance of NullLogger, as it does nothing
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* we only need the one
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*/
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private static POILogger _nullLogger = new NullLogger();
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/**
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* The name of the class to use. Initialised the
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* first time we need it
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*/
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private static String _loggerClassName = null;
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/// <summary>
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/// Initializes a new instance of the <see cref="POILogFactory"/> class.
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/// </summary>
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private POILogFactory()
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{
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}
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/// <summary>
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/// Get a logger, based on a class name
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/// </summary>
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/// <param name="type">the class whose name defines the log</param>
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/// <returns>a POILogger for the specified class</returns>
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public static POILogger GetLogger(Type type)
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{
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return GetLogger(type.Name);
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}
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/// <summary>
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/// Get a logger, based on a String
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/// </summary>
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/// <param name="cat">the String that defines the log</param>
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/// <returns>a POILogger for the specified class</returns>
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public static POILogger GetLogger(String cat)
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{
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POILogger logger = null;
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// If we haven't found out what logger to use yet,
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// then do so now
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// Don't look it up until we're first asked, so
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// that our users can set the system property
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// between class loading and first use
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if(_loggerClassName == null) {
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try {
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_loggerClassName = ConfigurationManager.AppSettings["loggername"];
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} catch(Exception) {}
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// Use the default logger if none specified,
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// or none could be fetched
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if(_loggerClassName == null) {
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_loggerClassName = _nullLogger.GetType().Name;
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}
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}
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// Short circuit for the null logger, which
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// ignores all categories
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if(_loggerClassName.Equals(_nullLogger.GetType().Name)) {
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return _nullLogger;
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}
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// Fetch the right logger for them, creating
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// it if that's required
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if (_loggers.ContainsKey(cat)) {
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logger = (POILogger)_loggers[cat];
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} else {
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try {
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//logger=assembly.CreateInstance(_loggerClassName) as POILogger;
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Type loggerClass = Type.GetType(_loggerClassName);
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logger = Activator.CreateInstance(loggerClass) as POILogger;
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logger.Initialize(cat);
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} catch(Exception) {
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// Give up and use the null logger
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logger = _nullLogger;
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}
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// Save for next time
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_loggers[cat] = logger;
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}
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return logger;
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}
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}
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}
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