001/* 
002 * (C) Copyright 2006-2011 Nuxeo SA (http://nuxeo.com/) and others.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 *
016 * Contributors:
017 *     bstefanescu
018 */
019package org.nuxeo.ecm.webengine.jaxrs;
020
021import java.io.IOException;
022
023import javax.servlet.Filter;
024import javax.servlet.FilterChain;
025import javax.servlet.ServletException;
026import javax.servlet.ServletRequest;
027import javax.servlet.ServletResponse;
028import javax.servlet.http.HttpServletRequest;
029import javax.servlet.http.HttpServletResponse;
030
031/**
032 * Simple abstract filter that provides filter activation logic.
033 *
034 * @author <a href="mailto:bs@nuxeo.com">Bogdan Stefanescu</a>
035 */
036public abstract class HttpFilter implements Filter {
037
038    public static final boolean getBoolean(ServletRequest request, String key) {
039        return Boolean.parseBoolean((String) request.getAttribute(key));
040    }
041
042    @Override
043    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException,
044            ServletException {
045        if (request instanceof HttpServletRequest == false) {
046            chain.doFilter(request, response);
047            return;
048        }
049        run((HttpServletRequest) request, (HttpServletResponse) response, chain);
050    }
051
052    protected abstract void run(HttpServletRequest request, HttpServletResponse response, FilterChain chain)
053            throws IOException, ServletException;
054
055}