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/*
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* Angkor Web Framework
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*
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* Distributable under LGPL license.
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* See terms of license at gnu.org.
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*/
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package com.tirsen.angkor;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import javax.servlet.Filter;
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import javax.servlet.FilterChain;
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import javax.servlet.FilterConfig;
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import javax.servlet.ServletException;
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import javax.servlet.ServletRequest;
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import javax.servlet.ServletResponse;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import java.io.IOException;
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/**
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* A servlet filter acting as the main entry point to the Angkor engine, passes the request
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* to RenderContext where the actual engine is implemented.
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*
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* <!-- $Id: ApplicationFilter.java,v 1.8 2002/10/13 13:37:26 tirsen Exp $ -->
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*
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* @author $Author: tirsen $
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* @version $Revision: 1.8 $
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*/
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public class ApplicationFilter implements Filter
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{
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private static Log logger = LogFactory.getLog(ApplicationFilter.class);
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private FilterConfig filterConfig;
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private Class applicationClass;
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public final static String APPLICATION_CLASS_PARAM = "application";
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public void init(FilterConfig config) throws ServletException
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{
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String applicationClassName = config.getInitParameter(APPLICATION_CLASS_PARAM);
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if (applicationClassName == null)
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{
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throw new ServletException("Configuration error. Application-class must be specified in 'application'-property.");
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}
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try
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{
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applicationClass = Class.forName(applicationClassName);
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}
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catch (ClassNotFoundException e)
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{
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throw new ServletException(e.getMessage());
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}
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}
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public void doFilter(ServletRequest sRequest, ServletResponse sResponse, FilterChain chain) throws IOException, ServletException
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{
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if (applicationClass == null) init(filterConfig);
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HttpServletRequest request = (HttpServletRequest) sRequest;
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HttpServletResponse response = (HttpServletResponse) sResponse;
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RenderContext context = new RenderContext(request, response);
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ApplicationFactory applicationFactory = new ApplicationFactory(request.getSession());
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applicationFactory.ensureApplicationInit(applicationClass);
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Application application = applicationFactory.getApplication();
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request.getSession().setMaxInactiveInterval(5 * 60); // expire after five minutes
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context.ensureApplicationInit(applicationClass);
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context.beforeRequest();
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// the processing could have redirected the request or sent an error or something else
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// therefor make sure not to write on a commited response
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if (!response.isCommitted()) chain.doFilter(sRequest, sResponse);
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context.afterRequest();
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}
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public void destroy()
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{
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}
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}
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