com.twelvemonkeys.servlet.HttpServlet Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of twelvemonkeys-servlet
There is a newer version: 2.3
/*
 * Copyright (c) 2008, Harald Kuhr
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name "TwelveMonkeys" nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package com.twelvemonkeys.servlet;

import com.twelvemonkeys.lang.BeanUtil;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import java.lang.reflect.InvocationTargetException;

/**
 * Defines a generic, HTTP specific servlet.
 * 
 * {@code HttpServlet} has an auto-init system, that automatically invokes
 * the method matching the signature {@code void setX(<Type>)},
 * for every init-parameter {@code x}. Both camelCase and lisp-style paramter
 * naming is supported, lisp-style names will be converted to camelCase.
 * Parameter values are automatically converted from string represenation to
 * most basic types, if neccessary.
 *
 * @author Harald Kuhr
 * @author last modified by $Author: haku $
 * 
 * @version $Id: //depot/branches/personal/haraldk/twelvemonkeys/release-2/twelvemonkeys-servlet/src/main/java/com/twelvemonkeys/servlet/HttpServlet.java#1 $
 */
public abstract class HttpServlet extends javax.servlet.http.HttpServlet {

    /**
     * Called by the web container to indicate to a servlet that it is being
     * placed into service.
     * 

     * This implementation stores the {@code ServletConfig} object it
     * receives from the servlet container for later use. When overriding this
     * form of the method, call {@code super.init(config)}.
     * 
     * This implementation will also set all configured key/value pairs, that
     * have a matching setter method annotated with {@link InitParam}.
     *
     * @param pConfig the servlet config
     * @throws ServletException if an error ouccured during init
     *
     * @see javax.servlet.GenericServlet#init
     * @see #init() init
     * @see BeanUtil#configure(Object, java.util.Map, boolean)
     */
    @Override
    public void init(ServletConfig pConfig) throws ServletException {
        if (pConfig == null) {
            throw new ServletConfigException("servletconfig == null");
        }

        try {
            BeanUtil.configure(this, ServletUtil.asMap(pConfig), true);
        }
        catch (InvocationTargetException e) {
            throw new ServletConfigException("Could not configure " + getServletName(), e.getCause());
        }

        super.init(pConfig);
    }
}