Java tutorial
/* * 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.jackrabbit.j2ee; import org.apache.commons.collections.BeanMap; import org.apache.jackrabbit.util.Text; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import java.util.Enumeration; import java.util.Iterator; import java.util.Properties; import javax.servlet.ServletConfig; import javax.servlet.ServletException; /** * Abstract configuration class that is based on a bean map. */ public abstract class AbstractConfig { /** * default logger */ private static final Logger log = LoggerFactory.getLogger(AbstractConfig.class); protected boolean valid; private BeanMap map = new BeanMap(this); /** * Initializes the configuration with values from the given properties * @param props the configuration properties */ public void init(Properties props) throws ServletException { Iterator iter = props.keySet().iterator(); while (iter.hasNext()) { String name = (String) iter.next(); String mapName = toMapName(name, '.'); try { if (map.containsKey(mapName)) { map.put(mapName, props.getProperty(name)); } } catch (Exception e) { throw new ServletExceptionWithCause("Invalid configuration property: " + name, e); } } } public void init(ServletConfig ctx) throws ServletException { Enumeration names = ctx.getInitParameterNames(); while (names.hasMoreElements()) { String name = (String) names.nextElement(); String mapName = toMapName(name, '-'); try { if (map.containsKey(mapName)) { map.put(mapName, ctx.getInitParameter(name)); } } catch (Exception e) { throw new ServletExceptionWithCause("Invalid servlet configuration option: " + name, e); } } } public String toMapName(String name, char delim) { StringBuffer ret = new StringBuffer(); String[] elems = Text.explode(name, delim); ret.append(elems[0]); for (int i = 1; i < elems.length; i++) { ret.append(elems[i].substring(0, 1).toUpperCase()); ret.append(elems[i].substring(1)); } return ret.toString(); } public void validate() { valid = true; } public boolean isValid() { return valid; } public void logInfos() { log.info("Configuration of {}", Text.getName(this.getClass().getName(), '.')); log.info("----------------------------------------------"); Iterator iter = map.keySet().iterator(); while (iter.hasNext()) { String name = (String) iter.next(); log.info(" {}: {}", name, map.get(name)); } log.info("----------------------------------------------"); } }