001/* 
002 * Copyright (c) 2006-2011 Nuxeo SA (http://nuxeo.com/) and others.
003 *
004 * All rights reserved. This program and the accompanying materials
005 * are made available under the terms of the Eclipse Public License v1.0
006 * which accompanies this distribution, and is available at
007 * http://www.eclipse.org/legal/epl-v10.html
008 *
009 * Contributors:
010 *     bstefanescu
011 */
012package org.nuxeo.ecm.webengine.jaxrs;
013
014import java.io.IOException;
015
016import javax.servlet.Filter;
017import javax.servlet.FilterChain;
018import javax.servlet.ServletException;
019import javax.servlet.ServletRequest;
020import javax.servlet.ServletResponse;
021import javax.servlet.http.HttpServletRequest;
022import javax.servlet.http.HttpServletResponse;
023
024/**
025 * Simple abstract filter that provides filter activation logic.
026 *
027 * @author <a href="mailto:bs@nuxeo.com">Bogdan Stefanescu</a>
028 */
029public abstract class HttpFilter implements Filter {
030
031    public static final boolean getBoolean(ServletRequest request, String key) {
032        return Boolean.parseBoolean((String) request.getAttribute(key));
033    }
034
035    @Override
036    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException,
037            ServletException {
038        if (request instanceof HttpServletRequest == false) {
039            chain.doFilter(request, response);
040            return;
041        }
042        run((HttpServletRequest) request, (HttpServletResponse) response, chain);
043    }
044
045    protected abstract void run(HttpServletRequest request, HttpServletResponse response, FilterChain chain)
046            throws IOException, ServletException;
047
048}