| 1 | // Copyright 2004-2007 Jean-Francois Poilpret |
| 2 | // |
| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | // you may not use this file except in compliance with the License. |
| 5 | // You may obtain a copy of the License at |
| 6 | // |
| 7 | // http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | // |
| 9 | // Unless required by applicable law or agreed to in writing, software |
| 10 | // distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | // See the License for the specific language governing permissions and |
| 13 | // limitations under the License. |
| 14 | |
| 15 | package net.sourceforge.hiveutils.web.util; |
| 16 | |
| 17 | import java.util.Enumeration; |
| 18 | |
| 19 | import javax.servlet.ServletContext; |
| 20 | import javax.servlet.ServletContextEvent; |
| 21 | import javax.servlet.ServletContextListener; |
| 22 | |
| 23 | /** |
| 24 | * ServletContextListener that will initialize System properties with values |
| 25 | * that are provided as parameters to the listener. |
| 26 | * <p> |
| 27 | * This allows to use the container mechanisms (like context.xml in Tomcat) to |
| 28 | * externalize these properties outside of the war file. |
| 29 | * <p> |
| 30 | * This listener will put all parameters with a name starting with "init." into |
| 31 | * the System properties. |
| 32 | * |
| 33 | * @author Jean-Francois Poilpret |
| 34 | */ |
| 35 | public class SystemPropertyInitListener implements ServletContextListener |
| 36 | { |
| 37 | static final private String INIT_PREFIX = "init."; |
| 38 | |
| 39 | public void contextInitialized(ServletContextEvent evt) |
| 40 | { |
| 41 | // Get information from init parameters |
| 42 | ServletContext context = evt.getServletContext(); |
| 43 | Enumeration params = context.getInitParameterNames(); |
| 44 | while (params.hasMoreElements()) |
| 45 | { |
| 46 | String name = (String) params.nextElement(); |
| 47 | if (name.startsWith(INIT_PREFIX)) |
| 48 | { |
| 49 | String value = context.getInitParameter(name); |
| 50 | name = name.substring(INIT_PREFIX.length()); |
| 51 | System.setProperty(name, value); |
| 52 | } |
| 53 | } |
| 54 | } |
| 55 | |
| 56 | public void contextDestroyed(ServletContextEvent evt) |
| 57 | { |
| 58 | } |
| 59 | } |