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Javascript/CSS bundling and compressing tool for java web apps. By using jawr resources are automatically bundled together and optionally minified and gzipped. Jawr provides tag libraries to reference a generated bundle either by id or by using the name of any of its members.

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/**
 * Copyright 2007-2016 Jordi Hernández Sellés, Ibrahim Chaehoi
 * 
 * Licensed 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 net.jawr.web.servlet;

import java.io.IOException;

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import net.jawr.web.JawrConstant;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.slf4j.Marker;
import org.slf4j.MarkerFactory;

/**
 * 
 * Main Jawr servlet. Maps logical URLs to script bundles, which are generated
 * on the fly (may be cached), and served as a single file.
 * 
 * 
 * @author Jordi Hernández Sellés
 * @author Ibrahim Chaehoi
 */
public class JawrServlet extends HttpServlet implements ServletContextListener {

	/** The serial version UID */
	private static final long serialVersionUID = -4551240917172286444L;

	/** The logger */
	private static final Logger LOGGER = LoggerFactory.getLogger(JawrServlet.class);

	/** The request handler */
	protected JawrRequestHandler requestHandler;

	/*
	 * (non-Javadoc)
	 * 
	 * @see javax.servlet.GenericServlet#init()
	 */
	@Override
	public void init() throws ServletException {
		try {
			String type = getServletConfig().getInitParameter(JawrConstant.TYPE_INIT_PARAMETER);
			if (JawrConstant.BINARY_TYPE.equals(type)) {
				requestHandler = new JawrBinaryResourceRequestHandler(getServletContext(), getServletConfig());
			} else {
				requestHandler = new JawrRequestHandler(getServletContext(), getServletConfig());
			}
		} catch (ServletException e) {
			Marker fatal = MarkerFactory.getMarker("FATAL");
			LOGGER.error(fatal, "Jawr servlet with name " + getServletConfig().getServletName()
					+ " failed to initialize properly. ");
			LOGGER.error(fatal, "Cause:");
			LOGGER.error(fatal, e.getMessage(), e);
			throw e;
		} catch (Throwable e) {
			Marker fatal = MarkerFactory.getMarker("FATAL");
			LOGGER.error(fatal, "Jawr servlet with name " + getServletConfig().getServletName()
					+ " failed to initialize properly. ");
			LOGGER.error(fatal, "Cause: ");
			LOGGER.error(fatal, e.getMessage(), e);
			throw new ServletException(e);
		}
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see javax.servlet.http.HttpServlet#doGet(javax.servlet.http.
	 * HttpServletRequest , javax.servlet.http.HttpServletResponse)
	 */
	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		requestHandler.doGet(req, resp);
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see javax.servlet.GenericServlet#destroy()
	 */
	@Override
	public void destroy() {
		requestHandler.destroy();
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * javax.servlet.ServletContextListener#contextInitialized(javax.servlet
	 * .ServletContextEvent)
	 */
	@Override
	public void contextInitialized(ServletContextEvent sce) {

	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see javax.servlet.ServletContextListener#contextDestroyed(javax.servlet.
	 * ServletContextEvent)
	 */
	@Override
	public void contextDestroyed(ServletContextEvent sce) {
		requestHandler.destroy();
	}

}